CEMENTING EQUIPMENT AND CONTROL METHOD

Abstract

A cementing equipment and a control method. The cementing equipment includes a centrifugal pump, a plunger pump, and a lubrication system. The lubrication system includes: a lubricating oil pump, including a first lubricating oil outlet and a second lubricating oil outlet; a first distribution valve, including a first inlet, at least one first outlet, and a third outlet, where the first outlet is communicated with a packing lubricating end of the centrifugal pump, the first lubricating oil outlet is communicated with the first inlet; and a second distribution valve, including a second inlet and at least one second outlet, where the second outlet is communicated with a packing lubricating end of the plunger pump, the second lubricating oil outlet is communicated with the second inlet or the second lubricating oil outlet is communicated with the first inlet, and the second inlet is communicated with the third outlet.

Description

TECHNICAL FIELD

This application relates to the technical field of cementing equipment, and particularly relates to cementing equipment and a control method.

BACKGROUND

Cementing equipment is equipped with a high pressure plunger pump and a centrifugal pump. The high pressure plunger pump is configured to pump cement paste in a pressurized manner to pump mixed cement paste to a position between a wall of a well and a casing, so as to fix the casing; and the centrifugal pump is mainly configured to mix the cement paste of the cementing equipment and to supply the mixed cement paste to the high pressure plunger pump. In an operation process of the high pressure plunger pump, as a plunger performs a reciprocating motion, in order to seal the plunger to prevent high pressure cement paste from flowing out, a packing will be used on the plunger to seal the plunger; and in a similar way, in an operation process of the centrifugal pump, as a pump shaft performs a rotational motion, in order to seal the pump shaft, a packing is also used on the pump shaft to seal the pump shaft.

With respect to sealing the packing of the high pressure plunger pump and the packing of the centrifugal pump, due to the reciprocating motion and the rotational motion during operations, there are frictions between the plunger and the packing and between the pump shaft and the packing, which, on the one hand, will generate heat, and on the other hand, will cause wear of the packing. Thus, the service life is shortened. Therefore, in order to reduce the frictions and take away the heat, lubrication needs to be provided for sealing the packing of the plunger pump and the centrifugal pump.

Packing lubrication systems frequently used in existing equipment include a gas cap oil packing lubrication system and an electric grease lubrication system. Due to the problem of severe pollution, the gas cap oil packing lubrication system has been gradually replaced by the electric grease lubrication system presently. At present, the existing electric grease lubrication system has the problem that lubrication of the packing of the centrifugal pump and the packing of the high pressure plunger pump cannot be controlled independently. The principle of the electric grease lubrication system lies in that the electric grease lubrication system is controlled by detecting the displacement of the high pressure plunger pump; and when there is a displacement output of the high pressure plunger pump, the electric grease lubrication system is started, and meanwhile, lubricating grease is outputted to the packing of the high pressure plunger pump and the packing of the centrifugal pump. Such a lubricating mode mainly has the following two problems: I, if the centrifugal pump does not work in this case, the lubricating grease will flow to the packing thereof, resulting in huge waste of the lubricating grease due to bulk accumulation; and II, if only the centrifugal pump works but the high pressure plunger pump does not work, as the displacement output of the high pressure plunger pump cannot be detected, the electric grease lubrication system is not started in this case, so that the packing of the centrifugal pump cannot be lubricated, resulting in a condition that the packing is burnt because the packing of the centrifugal pump is insufficiently lubricated.

SUMMARY

The present disclosure aims to resolve at least one of the technical problems existing in the prior art. Therefore, the present disclosure provides cementing equipment. The cementing equipment respectively provides a packing of the centrifugal pump and a packing of the plunger pump with lubricating oil by arranging a first pump head and a second pump head. Respective control can be achieved, so that the lubricating oil will be not wasted, and the packing of the centrifugal pump or the packing of the plunger pump will be prevented from being insufficiently lubricated.

The cementing equipment according to the present disclosure, including a centrifugal pump, a plunger pump, and a lubrication system, where the lubrication system includes: a lubricating oil pump, including a first channel, a first lubricating oil outlet communicated with the first channel, a second channel, and a second lubricating oil outlet communicated with the second channel, where a first pump head is arranged in the first channel, and a second pump head is arranged in the second channel; a first distribution valve, including a first inlet, at least one first outlet, and a third outlet, where the first inlet is respectively communicated with the at least one first outlet, the first outlet is communicated with a packing lubricating end of the centrifugal pump, and the first lubricating oil outlet is communicated with the first inlet; and a second distribution valve, including a second inlet and at least one second outlet, where the second inlet is respectively communicated with the at least one second outlet, the second outlet is communicated with a packing lubricating end of the plunger pump, the second lubricating oil outlet is communicated with the second inlet or the second lubricating oil outlet is communicated with the first inlet, and the second inlet is communicated with the third outlet.

The cementing equipment according to the present disclosure respectively provides a packing of the centrifugal pump and a packing of the plunger pump with lubricating oil with lubricating oil by arranging a first pump head and a second pump head. Respective control can be achieved. When the plunger pump operates while the centrifugal pump is on standby, the second pump head operates to provide the packing of the plunger pump with the lubricating oil, and the first pump head is in the standby state; and when the centrifugal pump operates while the plunger pump is on standby, the first pump head operates to provide the packing of the centrifugal pump with the lubricating oil, and the second pump head is in the standby state, so that the lubricating oil will be not wasted, and the packing of the centrifugal pump or the packing of the plunger pump will be prevented from being insufficiently lubricated.

According to the cementing equipment provided by the present disclosure, the lubricating oil pump further includes an oil tank, including a first oil return port; and the cementing equipment further includes a first three-way valve, including a first port, a second port, and a third port, the first port being communicated with the first outlet, the second port being communicated with the packing lubricating end of the centrifugal pump, and the third port being communicated with the first oil return port, where the first three-way valve has a first state and a second state; when the first three-way valve is in the first state, the first port is communicated with the second port; and when the first three-way valve is in the second state, the first port is communicated with the third port.

Optionally, the oil tank further includes a second oil return port; and the cementing equipment further includes a second three-way valve, including a fourth port, a fifth port, and a sixth port, where the fourth port is communicated with the second lubricating oil outlet or the third outlet, the fifth port is communicated with the second inlet, and the sixth port is communicated with the second oil return port; and the second three-way valve has a third state and a fourth state; when the second three-way valve is in the third state, the fourth port is communicated with the fifth port; and when the second three-way valve is in the fourth state, the fourth port is communicated with the sixth port.

According to the cementing equipment provided by the present disclosure, there are a plurality of centrifugal pumps and a plurality of first outlets, the centrifugal pumps being in one-to-one correspondence to the first outlets, and each of the first outlets being communicated with the packing lubricating end of each of the centrifugal pumps.

Optionally, the first distribution valve further includes at least two third outlets; there are at least two second distribution valves; there are at least two plunger pumps; the third outlets, the second distribution valves, and the plunger pumps are in one-to-one correspondence; and each of the third outlets is communicated with one of the second inlets.

According to the cementing equipment provided by the present disclosure, a first sensor is arranged on the centrifugal pump; a second sensor is arranged on the plunger pump; and the cementing equipment further includes an electronic control unit, the first sensor and the second sensor both being electrically connected to the electronic control unit.

According to the cementing equipment provided by the present disclosure, an overflow valve and a pressure switch are arranged at each of the first lubricating oil outlet and the second lubricating oil outlet, and/or a one-way valve is arranged on a pipeline where the first outlet is communicated with the packing lubricating end of the centrifugal pump.

According to the cementing equipment provided by the present disclosure, the packing lubricating end of the plunger pump includes a plurality of lubricating points, and there are a plurality of third outlets, the lubricating points being in one-to-one correspondence to the third outlets, and the lubricating points being communicated with the third outlets.

A control method provided by the present disclosure for controlling the cementing equipment, including the following steps: detecting whether a centrifugal pump operates; controlling a first lubricating oil outlet of a lubricating oil pump to be open to provide a packing lubricating end of the centrifugal pump with lubricating oil when the centrifugal pump is in the operating state; detecting whether a plunger pump operates; and controlling a second lubricating oil outlet of the lubricating oil pump to be open to provide a packing lubricating end of the plunger pump with lubricating oil when the plunger pump is in the operating state.

Optionally, the control method includes the following steps: controlling the first three-way valve to be in a second state when the centrifugal pump is in an operation suspending state; and controlling the second three-way valve to be in a fourth state when the plunger pump is in an operation suspending state.

BRIEF DESCRIPTION OF THE DRAWINGS

Drawings herein are incorporated into the specification and constitute a part of this specification, show example embodiments that conform to the present disclosure, and are used for describing a principle of the present disclosure together with this specification.

To describe the technical solutions in the embodiments of the present disclosure or in the prior art, the drawings required for describing the embodiments or the prior art are briefly described below. Apparently, those of ordinary skill in the art may still derive other drawings from these drawings without making creative efforts.

FIG. 1 is a schematic diagram of cementing equipment according to an embodiment I of the present disclosure when a first three-way valve is an electromagnetic three-way valve;

FIG. 2 is a schematic diagram of the cementing equipment according to the embodiment I of the present disclosure when the first three-way valve is a hydraulically operated directional valve;

FIG. 3 is a schematic diagram of cementing equipment according to an embodiment II of the present disclosure when the first three-way valve is an electromagnetic three-way valve;

FIG. 4 is a schematic diagram of the cementing equipment according to the embodiment II of the present disclosure when the first three-way valve is a hydraulically operated directional valve; and

FIG. 5 is a flowchart of a control method according to an embodiment of the present disclosure.

NUMERALS IN THE DRAWINGS

100—lubrication system; 101—lubricating oil pump; 1—first pump head; 2—second pump head; 3—pressure switch; 4—overflow valve; 5—first distribution valve; 6—second distribution valve; 7—one-way valve; 8—first three-way valve; 81—electromagnetic three-way valve; 82—hydraulically operated directional valve; 9—second three-way valve; 10—first sensor; 11—second sensor; 12—control unit; 13—plunger pump; 132—lubricating point; 14—centrifugal pump; 142—first centrifugal pump; 144—second centrifugal pump; and 15—oil tank.

DETAILED DESCRIPTION

To make the objectives, technical solutions, and advantages of the embodiments of the present disclosure clearer, the following describes the technical solutions in the embodiments of this application with reference to the drawings in the embodiments of this application. The described embodiments are merely some embodiments of the present disclosure rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of this application without making creative efforts shall fall within the protection scope of this application.

Explanation of nouns in this application: A packing, also known as a filler, is usually formed by weaving soft threads. A strip filler with a square sectional area fills a seal chamber to achieve sealing so as to prevent liquid leakage.

As shown in FIG. 1 and FIG. 3, the cementing equipment according to the embodiment of the present disclosure includes a centrifugal pump 14, a plunger pump 13, and a lubrication system 100, where the lubrication system 100 includes: a lubricating oil pump 101, a first distribution valve 5, and a second distribution valve 6.

Specifically, the lubricating oil pump 101 includes a first channel, a first lubricating oil outlet communicated with the first channel, a second channel, and a second lubricating oil outlet communicated with the second channel, where a first pump head 1 is arranged in the first channel, and a second pump head 2 is arranged in the second channel; the first distribution valve 5 includes a first inlet, at least one first outlet, and a third outlet, the first inlet being respectively communicated with the at least one first outlet, the first outlet being communicated with a packing lubricating end of the centrifugal pump 14, and the first lubricating oil outlet being communicated with the first inlet; and the second distribution valve 6 includes a second inlet and at least one second outlet, where the second outlet is respectively communicated with the at least one second outlet, the second outlet is communicated with a packing lubricating end of the plunger pump 13, the second lubricating oil outlet is communicated with the second inlet or the second lubricating oil outlet is communicated with the first inlet, and the second inlet is communicated with the third outlet.

The lubricating oil pump 101 is configured to deliver the lubricating oil to the lubrication system 100; the first distribution valve 5 plays a role of distributing the lubricating oil flowing into the first inlet to the first outlet and the third outlet needed to output the lubricating oil pro rata; the second distribution valve 6 plays a role of distributing the lubricating oil flowing into the second inlet to the second outlet needed to output the lubricating oil pro rata, so as to control the output flow; each outlet (the first outlet, the second outlet, and the third outlet) corresponds to one branch; and the lubricating oil in each branch may be supplied to one or more lubricating points.

To expand, the first pump head 1 provides the first lubricating oil outlet with power for outputting the lubricating oil. When the centrifugal pump 14 operates, the lubricating oil flows to the first distribution valve 5 via the first lubricating oil outlet, flows into the first distribution valve 5 via the first inlet, flows out of the first distribution valve 5 via the first outlet after being distributed, and flows into the packing lubricating end of the centrifugal pump 14, so as to lubricate the packing of the centrifugal pump 14.

As shown in FIG. 1 and FIG. 2, the second pump head 2 provides the second lubricating oil outlet with power for outputting the lubricating oil. When the plunger pump 13 operates, the lubricating oil flows to the second distribution valve 6 via the second lubricating oil outlet, flows into the second distribution valve 6 via the second inlet, flows out of the second distribution valve 6 via the second outlet after being distributed, and flows into the packing lubricating end of the plunger pump 13, so as to lubricate the packing of the plunger pump 13.

As shown in FIG. 3 and FIG. 4, a lubricating confluence outputted from the first lubricating oil outlet and the second lubricating oil outlet jointly flows into the first distribution valve 5 via the first inlet. When the centrifugal pump 14 operates, the flow of the lubricating oil inputted into the first distribution valve 5 is controlled to be adapted to lubrication of the centrifugal pump 14, and the lubricating oil flows out of the first distribution valve 5 via the first outlet after being distributed and flows into the packing lubricating end of the centrifugal pump 14, so as to lubricate the packing of the centrifugal pump 14; when the plunger pump 13 operates, the flow of the lubricating oil inputted into the second distribution valve 6 is controlled to be adapted to lubrication of the plunger pump 13, and the lubricating oil flows out of the first distribution valve 5 via the third outlet after being distributed, flows into the second distribution valve 6, and flows into the packing lubricating end of the plunger pump 13 via the second outlet, so as to lubricate the packing of the plunger pump 13; and when the centrifugal pump 14 and the plunger pump 13 both operate, the flow of the lubricating oil inputted into the first distribution valve 5 is controlled to be adapted to lubrication of the centrifugal pump 14 and the plunger pump 13, the lubricating oil flows out of the first distribution valve 5 via the first outlet and the third outlet after being distributed, the lubricating oil flowing out from the first outlet flows to the packing lubricating end of the centrifugal pump 14 to lubricate the packing of the centrifugal pump 14, and the lubricating oil flowing out from the third outlet flows to the packing lubricating end of the plunger pump 13 to lubricate the packing of the plunger pump 13.

It should be noted that the distribution valves (the first distribution valve 5 and the second distribution valve 6) include, but not limited to, damping distributors, volumetric distributors, quantitative pressure distributors, progressive distributors, and adjustable flow distributors. The distribution valves (the first distribution valve 5 and the second distribution valve 6) in the embodiments shown in the drawings are the progressive distributors.

The cementing equipment according to the embodiments of the present disclosure respectively provides the packing of the centrifugal pump 14 and the packing of the plunger pump 13 with the lubricating oil by arranging the first pump head 1 and the second pump head 2. The packing of the plunger pump 13 often needs a large flow of the lubricating oil, and the packing of the centrifugal pump 14 needs a small flow of the lubricating oil, so that the quantities of the lubricating oil pumped by the first pump head 1 and the second pump head 2 can be respectively controlled to satisfy the lubricating oil quantity demands of the plunger pump 13 and the centrifugal pump 14. When the plunger pump 13 operates while the centrifugal pump 14 is on standby, the second pump head 2 operates to provide the packing of the plunger pump 13 with the lubricating oil, and the first pump head 1 is in the standby state; and when the centrifugal pump 14 operates while the plunger pump 13 is on standby, the first pump head 1 operates to provide the packing of the centrifugal pump 14 with the lubricating oil, and the second pump head 2 is in the standby state, so that the lubricating oil will be not wasted, and the packing of the centrifugal pump 14 or the packing of the plunger pump 13 will be prevented from being insufficiently lubricated.

As shown in FIG. 1 and FIG. 2, according to the cementing equipment in the embodiments of the present disclosure, an overflow valve 4 and a pressure switch 3 are arranged at each of the first lubricating oil outlet and the second lubricating oil outlet. That is to say, the overflow valve 4 and the pressure switch 3 are arranged at the first lubricating oil outlet, and the overflow valve 4 and the pressure switch 3 are arranged at the second lubricating oil outlet as well. The overflow valve 4 may prevent the lubricating oil from being guided in the lubrication system 100, i.e., the lubricating oil flows into the lubricating oil pump 101 from the first lubricating oil outlet or the lubricating oil flows into the lubricating oil pump 101 from the second lubricating oil outlet, so that the lubricating oil pump 101 is protected. The pressure switch 3 may guarantee that when the pressures at the first lubricating oil outlet and the second lubricating oil outlet reach a preset pressure, the lubricating oil pump 101 is controlled to suspend operation, so that the lubricating oil pump 101 is protected.

As shown in FIG. 3 and FIG. 4, in some embodiments, when the first lubricating oil outlet and the second lubricating oil outlet both are communicated with the first inlet, one overflow valve 4 may be shared.

According to the cementing equipment in the embodiments of the present disclosure, a one-way valve 7 is arranged on a pipeline where the first outlet is communicated with the packing lubricating end of the centrifugal pump 14, so that the lubricating oil may be prevented from flowing backwards.

As shown in FIG. 1 and FIG. 3, according to the cementing equipment in the embodiments of the present disclosure, the packing lubricating end of the plunger pump 13 includes a plurality of lubricating points 132, and there are a plurality of third outlets, the lubricating points 132 being in one-to-one correspondence to the third outlets, and the lubricating points 132 being communicated with the third outlets. As the packing of the plunger pump 13 needs the large quantity of the lubricating oil, the plurality of lubricating points 132 are arranged, so that the packing of the plunger pump 13 may be sufficiently lubricated.

As shown in FIG. 1 and FIG. 3, according to the cementing equipment in the embodiments of the present disclosure, there are a plurality of centrifugal pumps 14 and a plurality of first outlets, the centrifugal pumps 14 being in one-to-one correspondence to the first outlets, and each of the first outlets being communicated with the packing lubricating end of each of the centrifugal pumps 14.

As shown in FIG. 3 and FIG. 4, in some embodiments, the first distribution valve 5 further includes at least two third outlets; there are at least two second distribution valves 6; there are at least two plunger pumps 13; the third outlets, the second distribution valves 6, and the plunger pumps 13 are in one-to-one correspondence; and each of the third outlets is communicated with one of the second inlets.

As shown in FIG. 1 and FIG. 3, according to the cementing equipment in the embodiments of the present disclosure, a first sensor 10 is arranged on the centrifugal pump 14; a second sensor 11 is arranged on the plunger pump 13; and the cementing equipment further includes an electronic control unit 12, the first sensor 10 and the second sensor 11 both being electrically connected to the electronic control unit 12. The first sensor 10 is configured to detect whether the centrifugal pump 14 is in the operating state, and the second sensor 11 is configured to detect whether the plunger pump 13 is in the operating state.

Embodiment I

As shown in FIG. 1 and FIG. 2, cementing equipment includes a plunger pump 13, two centrifugal pumps 14, and two first sensors 10, where the first sensor 10 is arranged on each of the centrifugal pumps 14; the two centrifugal pumps 14 include a first centrifugal pump 142 and a second centrifugal pump 144; a first lubricating oil outlet is communicated with a first inlet; a second lubricating oil outlet is communicated with a second outlet; and first three-way valves 8 are in one-to-one correspondence to the centrifugal pumps 14.

According to the cementing equipment in the embodiment of the present disclosure, a lubricating oil pump 101 further includes an oil tank 15, where the first lubricating oil outlet and the second lubricating oil outlet both are communicated with the oil tank 15; the oil tank 15 includes a first oil return port; the cementing equipment further includes the first three-way valve 8, including a first port, a second port, and a third port, where the first port is communicated with the first outlet, the second port is communicated with a packing lubricating end of the centrifugal pump 14, and the third port is communicated with the first oil return port; and the first three-way 8 has a first state and a second state; when the first three-way valve is in the first state, the first port is communicated with the second port; and when the first three-way valve is in the second state, the first port is communicated with the third port. When there are a plurality of centrifugal pumps 14, each of the centrifugal pumps 14 corresponds to one first three-way valve 8, so that lubrication of each of the centrifugal pumps 14 is independently controlled. In such an arrangement, the lubricating oil may flow back to the oil tank 15 when the centrifugal pumps 14 needs not to be lubricated by the lubricating oil, so that the waste of the lubricating oil due to accumulation is avoided. In particular, when there are the plurality of centrifugal pumps 14, a part of which needs to be lubricated and the other part of which needs not to be lubricated, the centrifugal pumps 14 needing to be lubricated may be lubricated, and the lubricating oil on branches corresponding to the centrifugal pumps 14 needing not to be lubricated may flow back to the oil tank 15, so that the waste of the lubricating oil due to accumulation is avoided.

As shown in FIG. 1, the first three-way valve 8 is an electromagnetic three-way valve 81. When the first sensor 10 detects that the rotational speed of the centrifugal pump 14 is 0, the centrifugal pump 14 is identified to not operate, the first three-way valve 8 enters the second state, and in this case, the lubricating oil outputted from the first lubricating oil outlet flows back to the oil tank 15 via the first distribution valve 5, the first three-way valve 8, and the first oil return port in sequence. When the first sensor 10 detects that the rotational speed of the centrifugal pump 14 is not 0, the centrifugal pump 14 is identified to be in the operating state, the first three-way valve 8 enters the first state, the first port is communicated with the second port, and in this case, the lubricating oil outputted from the first lubricating oil outlet passes through the first distribution valve 5, the first three-way valve 8, and the packing lubricating end of the centrifugal pump 14 in sequence to lubricate the centrifugal pump 14.

As shown in FIG. 2, the first three-way valve 8 is a hydraulically operated directional valve 82. When the centrifugal pump 14 does not operate, a hydraulically operated port of the hydraulically operated directional valve 82 has no oil pressure, the hydraulically operated directional valve 82 movably opens the first port and the third port under the action of a spring, and in this case, the lubricating oil outputted from the first lubricating oil outlet flows back to the oil tank 15 via the first distribution valve 5, the first three-way valve 8, and the first oil return port in sequence; and when the centrifugal pump 14 operates, in this case, the oil pressure is transferred to the hydraulically operated port of the hydraulically operated directional valve 82, and in this case, the hydraulically operated directional valve 82 opens the first port and the second port. The lubricating oil outputted from the first lubricating oil outlet passes through the first distribution valve 5, the first three-way valve 8, and the packing lubricating end of the centrifugal pump 14 in sequence to lubricate the centrifugal pump 14.

In some embodiments, the oil tank 15 further includes a second oil return port; and the cementing equipment further includes a second three-way valve 9, including a fourth port, a fifth port, and a sixth port, where the fourth port is communicated with the second lubricating oil outlet or the third outlet, the fifth port is communicated with the second inlet, and the sixth port is communicated with the second oil return port; and the second three-way valve 9 has a third state and a fourth state; when the second three-way valve is in the third state, the fourth port is communicated with the fifth port; and when the second three-way valve is in the fourth state, the fourth port is communicated with the sixth port.

That is to say, when the second sensor 11 detects that the output displacement of the plunger pump 13 is 0, the plunger pump 13 is identified to not operate, and in this case, the second three-way valve 9 is in the fourth state. In this case, the lubricating oil outputted from the second lubricating oil outlet flows back to the oil tank 15 via the first three-way valve 8 and the first oil return port in sequence; and when the second sensor detects that the plunger pump 13 has the displacement output, the plunger pump 13 is identified to operate, the second three-way valve 9 enters the third state, the fourth port is communicated with the fifth port, and in this case, the lubricating oil outputted from the second lubricating oil outlet passes through the second three-way valve 9, the second distribution valve 6, and the packing lubricating end of the plunger pump 13 to lubricate the plunger pump 13.

Embodiment II

As shown in FIG. 3 and FIG. 4, cementing equipment includes two plunger pumps 13 and at least one centrifugal pump 14; a first lubricating oil outlet and a second lubricating oil outlet both are communicated with a first inlet; the plunger pumps 13 are in one-to-one correspondence to second three-way valves 9; a fourth port of each of the second three-way valves 9 is communicated with a third outlet, a fifth port thereof is communicated with a second inlet, and a sixth port thereof is communicated with a second oil return port, where the second three-way valve 9 has a third state and a fourth state; when the second three-way valve is in the third state, the fourth port is communicated with the fifth port; and when the second three-way valve is in the fourth state, the fourth port is communicated with the sixth port.

As shown in FIG. 3, a first three-way valve 8 is an electromagnetic three-way valve 81; when a first sensor 10 detects that the rotational speed of the centrifugal pump 14 is not 0, the centrifugal pump 14 is identified to be in the operating state, the electromagnetic three-way valve 81 enters the first state, the first port is communicated with the second port, and in this case, the lubricating oil outputted by a lubricating oil pump 101 passes through a first distribution valve 5, the electromagnetic three-way valve 81, and a packing lubricating end of the centrifugal pump 14 in sequence to lubricate the centrifugal pump 14; and when the first sensor 10 detects that the rotational speed of the centrifugal pump 14 is 0, the centrifugal pump 14 is identified to not operate, the electromagnetic three-way valve 81 enters the second state, and in this case, the lubricating oil outputted from the first lubricating oil outlet flows back to the oil tank 15 via the first distribution valve 5, the electromagnetic three-way valve 81, and the first oil return port in sequence.

As shown in FIG. 4, when the first three-way valve 8 is a hydraulically operated directional valve 82; when the centrifugal pump 14 operates, in this case, the oil pressure is transferred to a hydraulically operated port of the hydraulically operated directional valve 82; in this case, the hydraulically operated directional valve 82 enters the first state, the first port is communicated with the second port; and in this case, the lubricating oil outputted by the lubricating oil pump 101 passes through the first distribution valve 5, the first three-way valve 8, and a packing lubricating end of the centrifugal pump 14 to lubricate the centrifugal pump 14; and when the centrifugal pump 14 does not operate, the hydraulically operated port of the hydraulically operated directional valve 82 has no oil pressure, the hydraulically operated directional valve 82 movably opens the first port and the third port under the action of a spring, the hydraulically operated directional valve 82 enters the second state, and in this case, the lubricating oil outputted from the first lubricating oil outlet flows back to the oil tank 15 via the first distribution valve 5, the hydraulically operated directional valve 82, and the first oil return port in sequence.

When the plunger pump 13 is in the operating state, the second three-way valve 9 is in the third state, the fourth port and the fifth port are open, and in this case, the lubricating oil outputted by the lubricating oil pump 101 passes through the first distribution valve 5, the second three-way valve 9, the second distribution valve 6, and a packing lubricating end of the plunger pump 13 to lubricate the plunger pump 13; and when the plunger pump 13 is in the operation suspending state, the second three-way valve 9 is in the fourth state, the fourth port and the sixth port are open, and in this case, the lubricating oil outputted by the lubricating oil pump 101 flows back to the oil tank 15 via the first distribution valve 5, the second three-way valve 9, and the second oil return port in sequence.

The remainder is not described in detail.

As shown in FIG. 5, a control method for controlling the cementing equipment according to the present disclosure, including the following steps:

step S1: whether a centrifugal pump 14 operates is detected;

step S2: a first lubricating oil outlet of a lubricating oil pump 101 is controlled to be open to provide a packing lubricating end of the centrifugal pump 14 with lubricating oil when the centrifugal pump 14 is in the operating state, and a first three-way valve 8 is controlled to be in a first state;

step S3: whether a plunger pump 13 operates is detected; and

step S4: a second lubricating oil outlet of the lubricating oil pump 101 is controlled to be open to provide a packing lubricating end of the plunger pump 13 with the lubricating oil when the plunger pump 13 is in the operating state, and a second three-way valve 9 is controlled to be in a third state.

The steps S1 and S3 are not in a sequential order, and can be adjusted.

The cementing equipment according to the embodiments of the present disclosure respectively provides the packing of the centrifugal pump 14 and the packing of the plunger pump 13 with the lubricating oil by arranging the first pump head 1 and the second pump head 2. The packing of the plunger pump 13 often needs a large flow of the lubricating oil, and the packing of the centrifugal pump 14 needs a small flow of the lubricating oil, so that the quantities of the lubricating oil pumped by the first pump head 1 and the second pump head 2 can be respectively controlled to satisfy the lubricating oil quantity demands of the plunger pump 13 and the centrifugal pump 14. When the plunger pump 13 operates while the centrifugal pump 14 is on standby, the second pump head 2 operates to provide the packing of the plunger pump 13 with the lubricating oil, and the first pump head 1 is in the standby state; and when the centrifugal pump 14 operates while the plunger pump 13 is on standby, the first pump head 1 operates to provide the packing of the centrifugal pump 14 with the lubricating oil, and the second pump head 2 is in the standby state, so that the lubricating oil will be not wasted, and the packing of the centrifugal pump 14 or the packing of the plunger pump 13 will be prevented from being insufficiently lubricated.

In some embodiments, the first three-way valve 8 is controlled to be in a second state when the centrifugal pump 14 is in an operation suspending state; and the second three-way valve 9 is controlled to be in a fourth state when the plunger pump 13 is in an operation suspending state.

According to the control method in the embodiment of the present disclosure, the lubricating oil may flow back to the oil tank 15 when the centrifugal pump 14 needs not to be lubricated by the lubricating oil, so that the waste of the lubricating oil due to accumulation is avoided. In particular, when there are the plurality of centrifugal pumps 14, a part of which needs to be lubricated and the other part of which needs not to be lubricated, the centrifugal pumps 14 needing to be lubricated may be lubricated, and the lubricating oil on branches corresponding to the centrifugal pumps 14 needing not to be lubricated may flow back to the oil tank 15, so that the waste of the lubricating oil due to accumulation is avoided.

In the description of the present disclosure, it is to be understood that orientation or position relationships indicated by the terms such as “upper”, “lower”, “center” “left”, “right”, “inner”, “outer” “axial”, “radial”, “circumferential” and the like are based on orientation or position relationships shown in the drawings, and are used only for ease and brevity of illustration and description in the present disclosure, rather than indicating or implying that the mentioned apparatus or component needs to have a particular orientation or needs to be constructed and operated in a particular orientation. Therefore, such terms are not to be construed as limiting of the present disclosure. In addition, a feature defined to be “first” or “second” may explicitly or implicitly include one or more features. In the description of the present disclosure, unless otherwise specified, the meaning of “a plurality of” is two or more than two.

In the description of the present disclosure, it should be noted that unless otherwise explicitly specified and defined, the terms such as “mount”, “install”, “connect”, and “connection” should be understood in a broad sense. For embodiment, the connection may be a fixed connection, a detachable connection, or an integral connection; or the connection may be a mechanical connection or an electrical connection; or the connection may be a direct connection, an indirect connection through an intermediary, or internal communication between two components. Those of ordinary skill in the art may understand the specific meanings of the foregoing terms in the present disclosure according to specific situations.

In the description of this specification, the description of the reference terms such as “an embodiment”, “some embodiments”, “exemplary embodiments”, “example”, “specific example”, or “some examples” means that the specific features, structures, materials or characteristics described with reference to the embodiment or example are included in at least one embodiment or example of the present disclosure. In this specification, exemplary descriptions of the foregoing terms do not necessarily refer to the same embodiment or example. In addition, the described specific features, structures, materials, or characteristics may be combined in a proper manner in any one or more of the embodiments or examples.

Claims

1. A cementing system comprising a cementing equipment, the cementing equipment comprising a centrifugal pump, a plunger pump, and a lubrication system, wherein the lubrication system comprises: a lubricating oil pump, comprising a first channel and a second channel, a first lubricating oil outlet communicated with the first channel and a second lubricating oil outlet communicated with the second channel, wherein a first pump head is arranged in the first channel, and a second pump head is arranged in the second channel;a first distribution valve, comprising a first inlet, at least one first outlet, and a third outlet, wherein the first inlet is communicated with the at least one first outlet, the first outlet is communicated with a packing lubricating end of the centrifugal pump, and the first lubricating oil outlet is communicated with the first inlet; anda second distribution valve, comprising a second inlet and at least one second outlet, wherein the second inlet is communicated with the at least one second outlet, the second outlet is communicated with a packing lubricating end of the plunger pump, and the second lubricating oil outlet is communicated with the second inlet, orthe second lubricating oil outlet is communicated with the first inlet, and the second inlet is communicated with the third outlet.

2. The cementing system according to claim 1, wherein: the lubricating oil pump further comprises an oil tank comprising a first oil return port;the cementing equipment further comprises a first three-way valve comprising a first port, a second port, and a third port, the first port being communicated with the first outlet, the second port being communicated with the packing lubricating end of the centrifugal pump, and the third port being communicated with the first oil return port;the first three-way valve has a first state and a second state;when the first three-way valve is in the first state, the first port is communicated with the second port; andwhen the first three-way valve is in the second state, the first port is communicated with the third port.

3. The cementing system according to claim 2, wherein: the oil tank further comprises a second oil return port;the cementing equipment further comprises a second three-way valve comprising a fourth port, a fifth port, and a sixth port, the fourth port being communicated with the second lubricating oil outlet or the third outlet, the fifth port being communicated with the second inlet, and the sixth port being communicated with the second oil return port;the second three-way valve has a third state and a fourth state;when the second three-way valve is in the third state, the fourth port is communicated with the fifth port; andwhen the second three-way valve is in the fourth state, the fourth port is communicated with the sixth port.

4. The cementing system comprising a plurality of cementing equipment of claim 1 comprising a plurality of centrifugal pumps and a plurality of first outlets, the plurality of centrifugal pumps being in one-to-one correspondence to the plurality of first outlets, and each of the plurality of first outlets being communicated with the packing lubricating end of each of the plurality of centrifugal pumps.

5. The cementing system according to claim 4, wherein: the first distribution valve further comprises at least two third outlets;there are at least two second distribution valves;there are at least two plunger pumps;the third outlets, the second distribution valves, and the plunger pumps are in one-to-one correspondence; andeach of the third outlets is communicated with one of the second inlets.

6. The cementing system according to claim 1, further comprising a first sensor arranged on the centrifugal pump; a second sensor arranged on the plunger pump; and an electronic control unit, wherein the first sensor and the second sensor both being electrically connected to the electronic control unit.

7. The cementing system according to claim 1, further comprising an overflow valve and a pressure switch arranged at each of the first lubricating oil outlet and the second lubricating oil outlet, and/or a one-way valve arranged on a pipeline where the first outlet is communicated with the packing lubricating end of the centrifugal pump.

8. The cementing system according to claim 1, wherein the packing lubricating end of the plunger pump comprises a plurality of lubricating points, and there are a plurality of third outlets, the plurality of lubricating points being in one-to-one correspondence to the plurality of third outlets, and the plurality of lubricating points being communicated with the plurality of third outlets.

9. A method for controlling a cementing equipment, the cementing equipment comprising a centrifugal pump, a plunger pump, and a lubrication system, wherein: the lubrication system comprises: a lubricating oil pump, comprising a first channel, a first lubricating oil outlet communicated with the first channel, a second channel, and a second lubricating oil outlet communicated with the second channel, wherein a first pump head is arranged in the first channel, and a second pump head is arranged in the second channel;a first distribution valve, comprising a first inlet, at least one first outlet, and a third outlet, wherein the first inlet is respectively communicated with the at least one first outlet, the first outlet is communicated with a packing lubricating end of the centrifugal pump, and the first lubricating oil outlet is communicated with the first inlet; anda second distribution valve, comprising a second inlet and at least one second outlet, wherein the second inlet is respectively communicated with the at least one second outlet, the second outlet is communicated with a packing lubricating end of the plunger pump, and the second lubricating oil outlet is communicated with the second inlet, orthe second lubricating oil outlet is communicated with the first inlet, and the second inlet is communicated with the third outlet; andthe method comprises:detecting whether the centrifugal pump operates;controlling the first lubricating oil outlet of the lubricating oil pump to be open to provide the packing lubricating end of the centrifugal pump with lubricating oil when the centrifugal pump is in an operating state;detecting whether the plunger pump operates; andcontrolling the second lubricating oil outlet of the lubricating oil pump to be open to provide the packing lubricating end of the plunger pump with lubricating oil when the plunger pump is in an operating state.

10. The method according to claim 9, wherein: the lubricating oil pump further comprises an oil tank comprising a first oil return port;the cementing equipment further comprises a first three-way valve comprising a first port, a second port, and a third port, the first port being communicated with the first outlet, the second port being communicated with the packing lubricating end of the centrifugal pump, and the third port being communicated with the first oil return port;the first three-way valve has a first state and a second state;when the first three-way valve is in the first state, the first port is communicated with the second port;when the first three-way valve is in the second state, the first port is communicated with the third port; andthe method further comprises: controlling the first three-way valve to be in the second state when the centrifugal pump is in an operation suspending state.

11. The method according to claim 10, wherein: the oil tank further comprises a second oil return port;the cementing equipment further comprises a second three-way valve comprising a fourth port, a fifth port, and a sixth port, the fourth port being communicated with the second lubricating oil outlet or the third outlet, the fifth port being communicated with the second inlet, and the sixth port being communicated with the second oil return port;the second three-way valve has a third state and a fourth state;when the second three-way valve is in the third state, the fourth port is communicated with the fifth port; and when the second three-way valve is in the fourth state, the fourth port is communicated with the sixth port; andthe method further comprises: controlling the second three-way valve to be in the fourth state when the plunger pump is in an operation suspending state.