Patent Application
20160060995
The invention concerns a gate valve assembly for shearing an elongated member and controlling a fluid flow through a through bore of the gate valve assembly, as well as a method for shearing an elongated member and controlling a fluid flow through a through bore of the gate valve assembly.
An elongated member as used in the application described herein includes well related tubular formed elongated members such as a tubing, coned tubing, drill pipes used in work over, drilling, completion, production or intervention operations. The elongated member may also be a wire line or the actual tools to be used when carrying out well related operations.
It is well know within the field to use a safety installment assembly such as for instance a Blow Out Preventer (BOP) or a LRP (lower riser package) in order to avoid a blow out from a well bore when a rapid shut down of the well is necessary, especially in an emergency situation.
Various kinds of safety installment assemblies on subsea wells are known from the prior art. BOP arrangements normally have a combined operation mode where cutting the tubing or the wire employed in the well first takes place with one element, for instance a ram arrangement, and thereafter closing the well to ensure a sealed closure to avoid fluid leakage of well fluid with another element in the BOP stack.
As an alternative to a BOP stack with several separate elements, a cutting gate valve arrangement may be used, wherein cutting devices for the cutting of a tubing or a wire line may be included in the gate valve arrangement for shearing of the tubing/wire line prior to closing and sealing the well bore. Such a gate valve arrangement may be provided in various ways. The gate valve arrangement may include one gate valve or plural gate valves. Further the gate valve may comprise a single gate element or plural gate elements for dosing the gate valve.
In accordance with an established and well practiced solution, the cutting tool of the gate valve is formed at a front edge of the movable gate element of the gate valve, thereby the dosing of the gate valve follows after the cutting of the tube has taken place. However when employing this solution it is necessary to make sure that the actual cutting is to be carried out properly and to ensure that the cut parts of the tubing are properly separated and removed from the dosing area of the gate valve before the dosing of the gate valve takes place. If not, there is a risk that the cut parts of the tubular or wire line will be stuck during the dosing of the gate element, in which case there is no proper dosing of the gate valve and no satisfactory dosing of the well.
Examples of prior art solutions include U.S. Pat. No. 6,601,650; U.S. Pat. No. 8,353,338; and U.S. Pat. No. 8,567,490.
U.S. Pat. No. 6,601,650 discloses a valve assembly with gate valves each arranged with a cutting edge at a front portion of the gate element. This publication describes the arrangement of providing the area dose to the gate valve opening with inclined surfaces for moving the sheared pipe parts away from the gate valve before closing the gate valve.
U.S. Pat. No. 8,353,338 shows two gate valves each with a moveable gate element provided with a cutting edge. The two gate valves are arranged at each side of the pipe to be sheared and positioned displaced relative to each other as seen in the axial direction of the pipe.
U.S. Pat. No. 8,567,490 describes the provision of a knife edge at the gate element of the gate valve in order to obtain a dean cut when cutting the tube. This publication also describes the arrangement of spring dements to enhance the sealing force when dosing the gate valve.
An objective of the invention is to provide a gate valve arrangement which is capable of obtaining an efficient shearing of the elongated member and the subsequently closing and sealing of the well bore.
A further objective is to ensure that the cutting process is properly completed before the dosing and sealing of the gate valve arrangement is carried out.
A third objective of the invention is to provide a gate valve arrangement with a compact construction, reliable working principles and a simple operation. It has been desirable to provide a gate valve arrangement which ensures that the cutting operation is concluded before the dosing of the gate valve is conducted to avoid the problems as described above.
A fourth objective is to ensure the integrity of the sealing functions of the gate valve.
The invention is set forth and characterized in the independent claims, while the dependent claims describe other characteristics of the invention.
The invention comprises a gate valve assembly for shearing an elongated member and controlling a fluid flow through a through bore of the gate valve assembly. The through bore is adapted for fluid communication with a well bore and is configured for receiving an elongated member. The gate valve assembly comprises a gate element movably arranged transverse to the through bore between an open position where a gate bore of gate element communicates with the through bore and a closed position where the through bore of the valve assembly is closed off. The shear gate is arranged in a recess in the gate element and the recess has an opening into the gate bore and an orientation transverse to the gate bore. The shear gate is movably arranged in the recess between a shear gate open position where the through bore/gate bore is open and a shear gate closed position where a cutting portion of the shear gate occupies the gate bore. The gate valve assembly may be arranged with a sealing arrangement providing sufficient sealing for the gate element.
By this arrangement of the gate valve assembly conditions are provided for ensuring that the shearing is conducted before the through bore is closed. And, by arranging the shear gate in the movable gate element a relatively compact gate valve assembly is achieved. By arranging the shear gate inside the gate element it is also ensured that the shearing occurs in a plane separate from the closing of the gate element.
In an embodiment of the invention the gate element may be arranged for displacement into the closed position, provided that the shearing gate is arranged in the closed position.
This arrangement of the gate valve assembly ensures that the shear gate needs to be in a closed position with the cutting portion of the shear gate occupying the gate bore, before the closing of the gate valve assembly. By this arrangement it is possible to provide a reliable arrangement ensuring that the shearing is completed before the movable gate element closes the through bore.
In an embodiment of the invention the cutting portion of the shear gate may be provided with at least one hole allowing fluid communication through the cutting portion. By the provision of one or more holes in the cutting portion, the cutting portion may be inserted into the gate bore without causing the fluid flow in the through bore to close off.
In accordance with the invention the shear gate is arranged in a recess in the gate element and the recess may have an opening into the gate bore. In one embodiment the recess may be arranged to extend transversely to the gate bore so that a first portion of the recess is arranged diametrically opposite a second portion of the recess in the gate bore. In this embodiment, when the shear gate is in an open position, the cutting portion is accommodated in the first portion or the second portion of the recess. In one aspect the cutting portion may be accommodated in the first portion before shearing takes place and a further portion of the shear gate may be accommodated in the second portion of the recess.
In one aspect the shear gate may be provided with a shear gate bore. The cutting portion may be arranged for accommodation in a first portion of the recess and the shear gate bore is arranged for accommodation in a second portion of the recess. The cutting portion and the shear gate bore may be arranged for positioning into the gate bore, depending on the opening and closing of the shear gate. The shear gate bore may be arranged for positioning in corresponding alignment with the gate bore in the shear gate open position, and the cutting portion may be arranged for positioning in the gate bore in the shear gate closing position.
Various actuating means may be provided for controlling the movement of the shear gate and the gate element. In one embodiment, one actuator may be arranged for conducting the movement of the shear gate and the gate element. Alternatively, a shear gate actuator may be provided for moving the shear gate and a gate element actuator may be provided for moving the gate element.
The movement of the shear gate in order to move between the closed and opened shear gate position, and the movements of the gate element between the open and closed positions, may occur in the same direction or in opposite directions.
In one embodiment of the invention, the closing of the gate element and the closing of the shear gate may occur by arranging the gate element and the shear element to occur in the same direction, wherein the closing of the gate element may follow the closing of the shear gate. The shear gate may then have an open position wherein the cutting portion may be in the first portion of the recess, and when moving the shearing gate into the shear gate closing position, the shear gate may move in a direction positioning the cutting portion into the gate bore. The gate element may then be moved into a closing position by moving the gate element in the same direction. In one aspect of the embodiment, the shear gate may follow the movement of the gate element, thereby continuing to move the shear gate in the same direction away from the gate bore and closing the gate bore.
In one aspect the shear gate may be provided with an arrangement for position control to ensure the correct position of the shear gate. The shear gate may then comprise a shear gate control member movably arranged in a control bore provided in the gate element. The shear gate control member may then be provided with a shear gate open position and a shear gate closed position. In the shear gate open position, the shear gate control member may be positioned in a first end stop position in the control bore and in the shear gate closed position, the shear gate control member may be positioned in the other end stop position of the control bore.
For carrying out an ordinary closing of the through bore without a preceding shearing operation, the gate valve arrangement may be provided for moving the gate element and the shear gate at the same time in the same direction, for instance by conducting movement by using a gate element actuator moving the gate element with the shear gate inside. The gate element may then be moved into the closing position, and the gate element may be reopened again by moving both the shear gate and the gate element simultaneously for the opening of the gate element. This may be carried out by moving the gate element into an open position by the movement of the shear gate, such as pushing the shear gate accommodated in the gate element and thus moving the gate element into an open position.
The invention also comprises a method for shearing an elongated member arranged in a through bore of a gate valve assembly and closing the through bore in a sealed manner. The through bore may be adapted for fluid communication with a well bore and configured for receiving an elongated member. The steps for shearing of the elongated member and closing the gate element are performed sequentially; wherein the steps comprise moving the shear gate in a recess in the gate element to thereby position a cutting portion of the shear gate into a shear gate closing position for shearing the elongated member, and thereafter moving the gate element with the shear gate accommodated in the recess and a cutting portion of the shear gate occupying the gate bore into a closing position for the closing of the through bore.
In accordance with an embodiment of the method of the invention, the shearing of the elongated member may be conducted by moving the shear gate in the recess, thereby protruding the cutting portion of the shear gate out from the recess and into the gate bore, and continuing to move the shear gate relative to the gate element until the shearing of the elongated member is completed and the shear gate is in the closed position. The shear gate and the gate element may be moved in the same direction. The shear gate and the gate element may be arranged with actuators providing opposing movements.
These and other characteristics of the invention will be explained in more detail with reference to the attached drawings showing a non-restrictive example.
a-3a are side section views of an embodiment of the invention showing the shear gate in the various positions for shearing of an elongated member, and
a-5a are side section views of an embodiment of the invention showing the gate element in the various positions for closing the gate valve assembly, and
a-10a are side section views of actuator arrangements and steps for operation of a gate valve arrangement in accordance with the invention, and
a-11g are side section views of an alternative embodiment of the invention showing the shear gate in the various positions for shearing an elongated member and closing of the gate valve assembly.
The embodiment of the invention as shown
The shear gate 5a is movably arranged in a recess 7 and has a cutting portion 6a, a shear gate bore 18 which is arranged for accommodation in an first portion 7a of the recess 7 and a shear gate bore 18 which is arranged for accommodation in a second portion 7b of the recess 7. The culling portion 6a and the shear gate bore 18 are arranged for positioning into the gate bore 8, depending on the opening and closing of the shear gate 5. The shear gate bore 18 is arranged for positioning in corresponding alignment with the gate bore 8 and through bore 2 so that an elongated member may be received through the gate valve assembly. The cutting portion 6a is provided with holes 10 allowing fluid communication through the cutting portion 6a when positioned in the gate bore 8.
The shear gate 5a is further provided with an arrangement for position control comprising a shear gate control member 15 movably arranged in a control bore 16 provided in the gate element 4. The shear gate control member 15 has a shear gate open position and a shear gate closed position. In the shear gate open position, the shear gate control member 15 is positioned in a first end stop position in the control bore 16 and in the shear gate closed position, the shear gate control member 15 is positioned in the other end stop position of the control bore 16.
The movements of the gate element 4 and the shear gate 5a are con rolled and conducted by an actuator means illustrated in figure la by an actuator arrangement stem 9. The actuator arrangement has provisions for moving the shear gate 5a relative to the gate element 4 and for moving the gate element 4 with the shear gate 5a included relative to the through bore 2. The gate element 4 and the shear gate 5a then move as an unit.
In
The gate bore 8 is provided with sleeved arrangements 11 for protecting the gate element seats 14. These sleeve arrangements are 11 made from the same cutting material as the shear gate 5a and provide a minimum gap (dose fitting) with the shear gate 5a to enhance the cutting operation and provide a secondary assist when moving the shear gate 5a. The sleeve arrangements 11 are also slightly recessed from the top and bottom sealing surfaces of the gate element 4 to minimize any possibility of residual damage caused by the cutting operation. The movements of the gate element 4 and the shear gate 5a are controlled and conducted by an actuator arrangement stem 9.
a, 2b and 3a, 3b show the steps of displacing the shear gate 5a in the recess 7 by the actuator arrangement stem 9 in order to bring the cutting portion 6a into the gate bore 8 for shearing the elongated element extending through the gate bore 8.
a, 3b show the position of the cutting portion 6a when the cutting/shearing process is completed and the shear gate control member 15 is then in the other end stop position in the control bore 16 corresponding to the shear gate closed position. The cutting portion 6a is then retracted from the first portion 7a of the recess and occupies the gate bore 8 in a closed position, and the shear gate bore 18 is displaced into the recess 7. In this closed position of the shear gate the holes 10 enable fluid flow through the gate bore 8 and through bore 2 for communication with the well bore.
a, 4b and 5a, 5b show the steps of dosing off fluid communication through the through bore 2 and the gate bore 8 by moving the gate element 4 into a closing position to prevent flow through the gate bore 8 and thereby through the through bore 2.
In
The continued movement conducted by the actuator arrangement stem 9 moves the gate element 4 further in the transverse bore 3, and the gate bore 8 is moved further away from the through bore 2, thus positioning a dosing portion 17 of the gate element in the through bore 2 to thereby prevent fluid communication from occurring through the through bore 2, as seen in
An alternative embodiment of an actuating means of the gate valve assembly is shown in
a, 7b show the gate element 4 in the closed position during a normal operation of the gate valve assembly where no shearing has taken place prior to the closing of the gate element 4, and the cutting portion 6a is thus included in the first portion 7a of the recess before the closing of the gate element 4. When moving the gate element 4 from an open position, where the gate bore 8 is aligned with the through bore 2 as shown in
a, 8b show the shear gate closed position. The shear gate actuator stem 20 conducts the movement of the shear gate 5a from the shear gate open position and into the shear gate closed position as shown in
a, 9b show the subsequent closing of the gate element 4 after the shearing is completed. The shear gate actuator stem 20 is fixed, while the gate element actuator stem 19 moves the shear gate 5a into the shear gate closed position with the shear gate control member 15 in the end stop position. In this case the gate element actuator stem 19 moves in the closing direction of the gate element 4, from left to right in
The gate element 4 is moved from the closed position shown in
a-11g are side section views of an alternative embodiment of the gate vale arrangement 1 illustrated with an elongated member in the through bore 2. The shear gate 5b has a configuration which differs from embodiment of the shear gate 5a shown in
A gate element actuator 40 is shown with the gate element actuator stem 19 and the actuating piston 25 displaceably arranged in a cylinder bore 28 arranged with fluid passages 50a, 50b as illustrated for fluid to enter and leave the cylinder bore 28 in order to displace the actuating piston 25 or to hold the position of the actuating piston 25.
A shear gate actuator 41 is shown with the shear gate actuator stem 20 and the actuating piston 26 displaceably arranged in a cylinder bore 29 arranged with fluid passages 51a, 51b as illustrated for fluid to enter and leave the cylinder bore 29 in order to displace the actuating piston 26 or to hold the position of the actuating piston 25. By this arrangement of the gate valve assembly where the gate element actuator 40 has a gate element actuator stem 19 and the shear gate actuator 41 has an actuator stern 20 moving in opposing directions, the gate valve assembly is pressure balanced with respect to the external (seawater ambient pressure) environment, making the entire gate valve assembly depth insensitive.
b shows the actuation of the shear gate 5b by displacing the actuating piston 26 in the respective cylinder bore 29 due to the entering of medium pressurized fluid through the fluid passage 51a and into the cylinder bore 28 as illustrated by arrow Al and the subsequent outlet from the fluid passage as illustrated by arrow A2. (The gate element 4 is held in position by regulating the fluid in and out from the fluid passages 50a, 50b.) The cutting portion 6b of the shear gate 5b pushes the elongated member 30 in the through bore 2 from the centered position of
c shows the initial phase of the shearing of the elongated member 30, wherein the high pressure fluid enters the fluid passage 51a and displaces the actuating piston 26, thereby providing the cutting force necessary for the shearing of the elongated member 30, as shown in
As shown in
e shows the actuation of the gate element 4 by displacing the actuating piston 25 in the respective cylinder bore 28 due to the entering of medium pressurized fluid through the fluid passage 50b and into the cylinder bore 28 as illustrated by arrow 31 and the subsequent outlet from fluid passage 50a as illustrated by arrow 32. The gate element 4 pushes the elongated member 30 in the through bore 2 from the position at one side of the through bore (the left hand position) of
The sheared parts of the elongated member 30 are pushed away from gate element bore 8 when closing the gate element 4 by the continued displacing of the actuating piston 25 in the respective cylinder bore 28. The displacement of the actuating piston is conducted due to the entering of high pressurized fluid through the fluid passage 50b and into the cylinder bore 28, as illustrated by arrow B1, and the subsequent outlet from fluid passage 50a, as illustrated by arrow B2 in
A person skilled in the art will understand that there may be made alterations and modifications to the embodiments that are within the scope of the invention as defined in the attached claims, and elements or features of the different embodiments may be combined in any configuration.
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/US2014/029349 | 3/14/2014 | WO | 00 |
| Number | Date | Country | |
|---|---|---|---|
| 61793698 | Mar 2013 | US |
