System and Method for Chemical Injection Paths

Abstract

An alternative chemical injection path system that includes a conduit and a manifold. The conduit has a first injection point configured at a first distance from a first end of the conduit and a second injection point configured at a second distance from the first end, with the second distance being different than the first distance. The manifold has an inlet and first and second outlets. The inlet is configured for receiving a chemical, while the first outlet is fluidly coupled to the first injection point, and the second outlet is fluidly coupled to the second injection point. The manifold is configured to distribute the chemical to the first injection point and the second injection point according to a location of a clog in the conduit.

Description

TECHNICAL FIELD

This disclosure is generally directed to fluid conduit. More specifically, this disclosure is directed to a system and method of providing alternative chemical injection paths.

BACKGROUND

The oil and gas industry has a variety of conduits (including downhole conduits) that are designed to transport a fluid, for example, a production fluid. To assist such production, a chemical is often injected. Problems arise when such conduits get clogged.

SUMMARY OF THE DISCLOSURE

According to one embodiment, an alternative chemical injection path system includes a conduit and a manifold. The conduit has a first injection point configured at a first distance from a first end of the conduit and a second injection point configured at a second distance from the first end, with the second distance being different than the first distance. The manifold has an inlet and first and second outlets. The inlet is configured for receiving a chemical, while the first outlet is fluidly coupled to the first injection point, and the second outlet is fluidly coupled to the second injection point. The manifold is configured to distribute the chemical to the first injection point and the second injection point according to a location of a clog in the conduit.

Before undertaking the DETAILED DESCRIPTION below, it may be advantageous to set forth definitions of certain words and phrases used throughout this patent document: the terms “include” and “comprise,” as well as derivatives thereof, mean inclusion without limitation; the term “or,” is inclusive, meaning and/or; the phrases “associated with” and “associated therewith,” as well as derivatives thereof, may mean to include, be included within, interconnect with, contain, be contained within, connect to or with, couple to or with, be communicable with, cooperate with, interleave, juxtapose, be proximate to, be bound to or with, have, have a property of, or the like. The phrase “at least one of,” when used with a list of items, means that different combinations of one or more of the listed items may be used, and only one item in the list may be needed. For example, “at least one of: A, B, and C” includes any of the following combinations: A; B; C; A and B; A and C; B and C; and A and B and C. Definitions for certain words and phrases are provided throughout this patent document, those of ordinary skill in the art should understand that in many if not most instances, such definitions apply to prior, as well as future uses of such defined words and phrases.

BRIEF DESCRIPTION OF THE DRAWINGS

For a more complete understanding of this disclosure and its features, reference is now made to the following description, taken in conjunction with the accompanying drawings, in which:

FIG. 1 shows a system that provides chemical injection points in a conduit, according to one embodiment of the present disclosure;

FIG. 2 schematically illustrations an alternative configuration 200A with daisy chaining;

FIG. 3 schematically illustrates an alternative configuration with a manifold with three alternative paths

FIG. 4 schematically illustrations an alternative configuration with redundant paths;

FIGS. 5A, 5B, 5C, and 5D illustrate an example manifold that may be configured on the conduit of FIG. 1 according to an embodiment of the present disclosure;

FIGS. 6A, 6B, 6C, and 6D illustrate an example connection piece that may be configured on the conduit of FIG. 1 according to one embodiment of the present disclosure;

FIGS. 7A, 7B, and 7C illustrate an example path clip that may be configured on the conduit of FIG. 1 according to one embodiment of the present disclosure.

DETAILED DESCRIPTION

The FIGURES described below, and the various embodiments used to describe the principles of the present disclosure in this patent document are by way of illustration only and should not be construed in any way to limit the scope of the disclosure. Those skilled in the art will understand that the principles of the present disclosure invention may be implemented in any type of suitably arranged device or system. Additionally, the drawings are not necessarily drawn to scale

FIG. 1 shows a system 200 that provides chemical injection points in a conduit 100, according to embodiments of the disclosure.

FIG. 1 shows a conduit 100 that, for example, may be used for the transport of fluids. The right of FIG. 1 generally corresponds to a downstream point whereas the left of FIG. 1 generally corresponds to an upstream point. Stated differently, the fluid flow from left to right with respect to FIG. 1. When the conduit 100 is down-hole, the left side of the conduit 100 of FIG. 1 is further downhole and the right side is closer to the surface.

To advantageously assist with such fluid flow, chemicals may be injected into the conduit 100 for a variety of reasons. In the case of downhole operations, such chemical injection is performed at a certain preferred location or locations—usually measured in feet from the surface. To inject chemicals into the conduit, capillary tubing (or other similar chemical injection line) can be ran downhole in parallel with the conduit. In operation, for a variety of reasons, either the capillary tubing (or other similar chemical injection line) and/or conduit may become clogged. As a non-limiting example, conduits can clog at check valves. Accordingly, embodiments of the disclosure provide alternative injection points to ensure chemical is received in the conduit.

Although chemicals are generally described with reference to certain configurations, it should be expressly understood that a variety of types of fluids may be “injected” and avail from embodiments of the disclosure. For purposes of illustration only, “fluid” will be used to describe flow through the conduit whereas “chemical” will describe the material that is injected. Also, while the term “injection” is used, in certain embodiments, such injection occurs inside of the conduit whereas, in other embodiments, injection occurs outside the conduit and may be enter an interior through a sucking of the fluid into an interior of the conduit.

The system 200 generally includes a manifold 210 that receives a chemical and first directs such chemicals to one or both of a first injection point 220 and a second injection point 230. In certain configurations, the second injection point 230 may be a preferred injection point and is further upstream (or downhole). Operationally, chemicals enter the manifold 210, for example, through upstream tubing (e.g., capillary tubing in some embodiments) that is not shown. If fluid flow through the conduit 100 is adequate (e.g., as will be described below), the manifold directs chemicals into the second injection point 230. However, if the conduit 100 and/or capillary tubing begins to become clogged, the manifold directs the chemical to the alternative (first) injection point 220. In particular configurations, the manifold 210 itself detects the pressure change in the interior of the pipe and/or its own capillary tubing.

While the injections points have been described with a certain arrangement as “preferred” and “alternative” injection points, operationally they may be switched for a variety of reasons according to this disclosure. Thus, in particular configurations, injection point 220 may be the preferred and injection point 230 can be the alternative. In such an alternative configuration, a switch form a downstream to an upstream may be used to help clear a clog.

The manifold 210 may operate in a variety of different manners to switch between the alternative fluid paths. In one configuration, the lack of pressure (e.g., because of lack of fluid. flow) forces a switch from one to the other (e.g., second injection point 230 to first second point 220). As one example, in one configuration, once the clog has been removed, the detected pressure change to normal may allow the manifold to switch back to primary flow through injection point 230. Again, as described above, the preferred injection point (or points) may be either point (or points)—depending on the operators' goal.

To allow the chemical injection into the second injection point 230, the chemical may travel through a second path 231, a second connection piece 233, and one or more holes 237. Similarly, to allow the chemical injection into the first injection point 220 (which may be the alternative path), the chemical may travel through a first path 221, a first connection piece 225, and one or more holes 227. These pieces are shown disconnected from the conduit 100 for the purpose of illustration. After reviewing this disclosure, one of ordinary skill in the art will recognize how such components may be placed on the conduit 100. For example, in one configuration, the one or more holes 227, 237 may be created (e.g., drilled) in an existing conduit 100 and retrofitted with the additional pieces, for example, with welding. Path clips 240 may also be added for the tubing associated with the system 200.

Each of the first and second paths 221, 231 may include any suitable type of piping structure for fluidly coupling the outlets of the manifold 210 to the one or more holes 227, 237, respectively. In a particular example, each of the first and second paths 221, 231 include an elongated section of tubing, such as ½ inch inside diameter (ID) steel tubing. Nevertheless, it should be appreciated that other sizes of tubing or pipe may be implemented having any suitable inside diameter size for conveying the chemical from the manifold 210 to the one or more holes 227, 237. In certain configurations, the paths for the fluids may be referred to as capillary tubing. In other configurations, such paths may be alternatively named.

In particular configurations, the respective flows between paths 221, 231 is not an all-or-nothing approach. Rather, the manifold 210 may circulate a degree of the chemicals, for example, as pressure changes. For example, for low pressures upstream, a relatively larger amount (or all) of the chemicals may be sent upstream for injection at a preferred point. Then, that relative amount may proportionally change with the increase of pressure upstream until, for example, the upstream preferred path is not used at all. Rather, the downstream path is used. This configurations my continue until, for example, the pressure alleviates and the contrary happens where the preferred upstream point is used again. As referenced above, the preferred and alternative injection points can alternatively be changed based on operation. In different configurations, the alternative points may be reversed in upstream/downstream preference.

While a proportional change is described in some configurations, in other configurations, the change may not be proportional. And, after having reviewed this disclosure, one of ordinary skill in the art will recognize that a variety of other configurations may be used in the manifold, including the ability to set and/or change biasing mechanisms associated with the manifold 210.

While a certain distance has been shown between the first injection point 220 and the second injection point 230, other distances may be used. And, while both injection points 220, 230 are shown on the same conduit segment, they may be located on a different segment.

FIG. 2 schematically illustrations an alternative configuration 200A with daisy chaining. For purpose of illustration, the components are shown as blocks. A conduit is shown in three pieces 100A, 100B, and 100C with a curved-line indicating lengths of the conduit not shown. Operationally, there are similarities to FIG. 1 except that two manifolds 210A, 231A are used in a daisy chained manner. Thus, in this configuration, injection point 250A may be preferred with injection pint 240A being the next preferred and, finally, injection point 220A being the last preferred. The manifolds 210A, 230A themselves may operate as described above in switching depending on pressures. Further details of manifold designs are, also, provided herein. The paths for chemical injection are shown as 211A, 221A, 231A, 241A, and 251A respectively leading to their component—either an injection point or a manifold. While only three alternative injection points with two manifolds are shown, in particular configurations, more than two manifolds and more than three injection points may be utilized.

FIG. 3 schematically illustrates an alternative configuration with a manifold with three alternative paths. For purpose of illustration, the components are shown as blocks. A conduit is shown in three pieces 300A, 300B, and 300C with a curved-line indicating lengths of the conduit not shown. Operationally, there are similarities to FIG. 1 and FIG. 2 except that a manifold 310A has at least three outputs paths for three points, injection point 340A, 330A, and 340A. Just like the description with other embodiments, these alternative paths can be chosen selectively in either a proportional or non-proportional manner. The paths for chemical injection are shown as 311A, 321A, 331A, and 341A, and 251A respectively leading to their component—either an injection point or manifold.

FIG. 4 schematically illustrations an alternative configuration with redundant paths. For purpose of illustration, the components are shown as blocks. A conduit is shown in two pieces 400A and 400B with a curve-line indicating lengths of the conduit not shown. Operationally, there are similarities to FIG. 1 and FIG. 2 except that redundant lines (e.g., 411A/411B, 431A/431B, 451A/451B) are ran to, from, and between manifolds 410A and 430A. Each manifold can have an injection point 420A and 440A (which can be close to or a distance from the manifold). In configurations such as this, the redundant lines may be seen as failover and/or switching manifolds. The paths for chemical injection are shown as 411A/411B, 431A/431B, and 451A/451B respective leading to or from a component.

With reference to the above figures, any select components and concepts can be combined with other configurations. As an example, a triple-manifold design can be used with daisy chaining; and, select paths can have redundant pipes. Also, while injection directly into a conduit is generally described, in particular configurations with any of the design described herein, the injection point can be on the exterior of the conduit and, for example, sucked into the pipe with other fluids. Such a configuration may be particularly useful for drilling scenarios.

FIGS. 5A, 5B, 5C, and 5D illustrate an example manifold 210 according to an embodiment of the present disclosure. In particular, FIG. 5A illustrates a down-hole facing side view of the manifold 210, FIG. 5B illustrates a plan view of the manifold 210, FIG. 5C illustrates an upward facing side view of the manifold 210, and FIG. 5D illustrates a lateral side view of the manifold 210. The manifold 210 includes an inlet 250, and first and second outlets 252254. As best shown in FIG. 5B, the manifold 210 includes a pressure detection and control mechanism 256 that distributes a chemical entering at the inlet 250 between the two outlets 252, 254.

For example, the pressure detection and control mechanism 256 detects a relative difference in pressures seen at outlets and adjusts the flow of chemical to the outlets 252, 254 to alleviate the relative change in pressure. In many cases, the relative change in pressure present between the two outlets 252, 254 are indicative of a clog between the injection points 220, 230. The pressure detection and control mechanism 256 is responsive to this perceived change in pressure to adjust the flow through the outlets 252, 254 so that the clog can be alleviated. In some embodiments, the pressure detection and control mechanism 256 is responsive to this change in pressure to proportionally adjust the flow through the outlets 252, 254 according to a corresponding proportional change in detected pressure.

FIGS. 6A, 6B, 6C, and 6D illustrate an example connection piece 223, 235 that may be configured on the conduit 100 of FIG. 1. In particular, FIG. 6A is a down-hole facing side view of the connection piece 223, 235, FIG. 6B is a lateral side view of the connection piece 223, 235, FIG. 6C is an upward facing side view of the connection piece 223, 235, and FIG. 6D is a plan view of the connection piece 223, 235. The connection piece 223, 235 includes an inlet 270 for receiving a chemical from the manifold 210 and a cavity 272 for fluidly coupling the inlet 270 to the injection points 220, 230.

FIGS. 6A, 6B, and 6C illustrate an example path clip 240 that may be configured on the conduit 100 of FIG. 1. In particular, FIG. 6A illustrates a plan view of the path clip 240, FIG. 6B illustrates a downhole facing side view of the path clip 240, and FIG. 4C illustrates a lateral side view of the path clip 640.

The connection pieces 223, 235 and path clips 240 may be made of any suitable material. In one embodiment, the connection piece 223, 235 and path clips 240 are made of a material similar to that of the conduit 100 so that the connection piece 223, 235 can be attached to the conduit 100 using a welding technique. For example, if the conduit 100 is made of standard carbon steel, the connection pieces 223, 235 and path clips 240 would also be made of standard carbon steel so that they could be welded to the side surface of the conduit 100.

In one embodiment, the manifold 210, paths 221, 231, connection pieces 223, 235, and path clips 240 are provided to the user separately from how the conduit 100 is provided to the user. The structure and size of the conduit 100 can vary widely for different applications. Given an oil/gas well production application, for example, the sizes of conduit 100 often range from 1.0 inches to 8.0 inches in diameter. Thus, it would be beneficial to provide the manifold 210, paths 221, 231, connection pieces 223, 235 and path clips 240 as a separate system so that the user can configure those components on the type of conduit 100 that is ideally suited for their specific application. For example, once the user obtains the manifold 210, paths 221, 231, connection pieces 223, 235, and path clips 240, he or she can attach the manifold 210, paths 221, 231, connection pieces 223, 235, and path clips 240 using a welding technique, or other suitable bonding mechanism in the field where the conduit 100 is to be used. For the connection pieces 223, 235, the user could first drill holes in the conduit 100, and weld the connection pieces 223, 235 over the holes so that the injection points 220, 230 are created by forming a pressure-tight seal between the cavity 272 and the holes formed in the conduit 100.

While this disclosure has described certain embodiments and generally associated methods, alterations and permutations of these embodiments and methods will be apparent to those skilled in the art. Accordingly, the above description of example embodiments does not define or constrain this disclosure. Other changes, substitutions, and alterations are also possible without departing from the spirit and scope of this disclosure, as defined by the following claims.

Claims

1-20. (canceled)

21. An injection path system comprising: a connection piece configured for placement on a conduit, the connection piece having: a curved surface configured to conform to a corresponding curved surface of the conduit,an inlet configured for receiving a chemical, andan outlet configured to provide the chemical to an injection point on the conduit.

22. The injection path system of claim 21, wherein the connection piece is configured to be welded to the conduit.

23. The injection path system of claim 21, wherein the connection piece is made of stainless steel.

24. The injection path system of claim 21, wherein the injection point is a plurality of holes, andthe connection piece has a cavity configured for fluid communication with each of the plurality of holes.

25. The injection path system of claim 21, further comprising: an injection line configured to run parallel with the tubing and provide chemical to the inlet.

26. The injection path system of claim 25, further comprising: one or more path clips configured to couple to the conduit, the one or more path clips holding the injection line in place relative to the conduit.

27. The injection path system of claim 26, wherein the one or more path clips is configured to be welded to the conduit.

28. The injection path system of claim 26, wherein the one or more path clips is made of stainless steel.

29. A chemical injection method comprising: creating an injection point in a conduit by drilling one more holes in a surface of the conduit;connecting a connection piece to the conduit at the location of the drilled one or more holes, the connection piece having: a curved surface configured to conform to a corresponding curved surface of the conduit,an inlet configured for receiving a chemical, andan outlet configured to provide the chemical to an injection point on the conduit; andwherein the connecting a connection piece to the conduit at the location of the drilled one or more holes creates a fluid type seal between the connection piece and the conduit.

30. The method of claim 29, wherein the connecting the connection piece to the conduit at the location of the drilled one or more holes includes welding the connection piece to the conduit.

31. The method of claim 29, wherein the connection piece is made of carbon steel.

32. The method of claim 29, wherein the injection point is a plurality of holes, andthe connection piece has a cavity configured for fluid communication with each of the plurality of holes.

33. The method of claim 21, further comprising: connecting an injection line to the conduit, the injection line configured to run parallel with the tubing and provide chemical to the inlet.

34. The method of claim 33, further comprising: connecting one or more path clips to the conduit, the one or more path clips holding the injection line in place relative to the conduit.

35. The injection path system of claim 34, wherein the connecting the one or more path clips to the conduit includes welding the more path clips to the conduit.

36. The injection path system of claim 34, wherein the one or more path clips is made of carbon steel.