Water injection well pressure relief clamp head and water injection well pressure relief test system

Abstract

The utility model relates to the technical field of oilfield water injection testing, in particular to a water injection well pressure relief clamp head and a water injection well pressure relief testing system. The pressure-relief clamp head of the water injection well comprises a main body and a pressure relief mechanism, one side of the main body is connected with the pressure relief mechanism, a testing channel and a pressure relief channel are arranged in the main body and the pressure relief mechanism respectively, the testing channel is connected with the pressure relief channel, and the pressure relief mechanism is opened and closed to control the pressure relief channel to be communicated or closed. By controlling the pressure relief mechanism on the clamp head, the problems that in the prior art, pressure relief cannot be achieved, sewage disposal is improper, and freezing and blocking are caused are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of oilfield water injection testing, in particular to a pressure-relieving clamp head for injection wells and a pressure-relieving testing system for injection wells. Background Technique

[0002] A clamp head is installed at the top of the test valve of the production tree of the injection well, which is used to connect the test blowout preventer pipe for testing operations, connect the washing well oil nipple for washing well operations, connect the pressure measuring and compensating core for pressure recording operations, etc. It is an extremely important auxiliary connection tool for injection wells.

[0003] Due to the sealing effect of the plug, there is a closed space in the clamp head at the upper end of the test valve, and the internal space pressure cannot be tested. Therefore, there is a safety hazard of operating under pressure when disassembling the plug. Moreover, when the test is over, after closing the test gate, the liquid between the pressure-relieving valve and the clamp head cannot be discharged through the vent valve. When disassembling the blowout preventer pipe, the liquid remaining in the lower section of the vent valve will pollute the production tree and the well site, which will not only greatly increase the workload and labor intensity of construction workers and pose a risk of environmental pollution; moreover, when reinstalling the plug after the test, the liquid inside the clamp head will also affect the installation of the plug; at the same time, in cold winter weather, the liquid remaining inside the clamp head may also freeze and block the clamp head.

[0004] In summary, the existing related technologies have at least the following problems:

[0005] (1) The pressure inside the pipe cannot be controlled, and there is a safety hazard of operating under pressure.

[0006] (2) The sewage cannot be completely drained and recycled, and there is a potential environmental pollution hazard.

[0007] (3) Residual liquid remains in the pipeline, and there is a risk of freezing and blocking. Content of the Utility Model

[0008] The utility model provides a pressure-relieving clamp head for injection wells and a pressure-relieving testing system for injection wells to alleviate the problems of inability to relieve pressure, improper sewage treatment, and freezing and blocking existing in the prior art.

[0009] In order to alleviate the above technical problems, the technical solution provided by the utility model lies in:

[0010] It includes a main body and a pressure-relieving mechanism. A test channel and a pressure-relieving channel are respectively arranged inside the main body and the pressure-relieving mechanism. The test channel is connected to the pressure-relieving channel, and the pressure-relieving mechanism controls the pressure-relieving channel to be communicated or closed through opening and closing.

[0011] Further, the pressure-relieving mechanism includes a valve and a connecting pipe. One end of the connecting pipe is communicated with the test channel, and the other end is connected to the valve.

[0012] Further, the connecting pipe is perpendicular to the test channel.

[0013] Further, a pressure relief connection hole is provided on the main body, and the connecting pipe is inserted into the pressure relief connection hole.

[0014] Further, the upper section of the main body is a circular diameter section, the lower section of the main body is a boss section, and a boss end face is further provided between the boss section and the circular diameter section. The boss end face connects the circular diameter section and the boss section.

[0015] Further, a clamping inclined surface is provided on the boss end face. The clamping inclined surface slopes downward along the outer wall of the boss section. The main body is fixed on the production tree by setting a connecting member on the clamping inclined surface.

[0016] Further, a sealing steel groove is further provided on the boss section, and the sealing steel grooves are distributed at the bottom end of the boss section.

[0017] Further, connecting threads are provided in the test channel, and the test channel is connected to a plug through the connecting threads.

[0018] Further, a vent pipe is further provided at one end of the pressure relief mechanism. When the pressure relief mechanism is opened, the vent pipe, the valve and the connecting pipe are communicated to relieve pressure.

[0019] Further, it further includes a connecting clamp and a pipeline joint, and the connecting clamp fixes the main body on the pipeline joint.

[0020] The beneficial effects of the pressure-relievable clamp head for injection wells in the present invention are analyzed as follows:

[0021] The present invention discloses a pressure-relievable clamp head for injection wells, which includes a main body and a pressure relief mechanism. A test channel and a pressure relief channel are respectively arranged inside the main body and the pressure relief mechanism. The test channel and the pressure relief channel are connected, and the pressure relief mechanism controls the pressure relief channel to be communicated or closed through opening and closing.

[0022] Before the test construction, the pressure relief channel is opened by operating the pressure relief mechanism connected to one side of the main body, and part of the liquid is discharged from the pressure relief channel; at the same time, after the instrument enters the test channel, the pressure relief mechanism is operated to control the pressure relief channel to be completely opened to drain the liquid in the test channel.

[0023] By operating the pressure relief mechanism on the side of the clamp head to control the pressure relief channel for rapid emptying and pressure relief, the construction efficiency is improved, and the risk of operating under pressure is avoided. At the same time, after the instrument enters the blowout preventer pipe, the pressure relief mechanism on the side of the clamp head opens the pressure relief channel to drain the liquid in the blowout preventer pipe, avoiding the remaining liquid from polluting the production tree and the well site, greatly reducing the labor intensity of construction workers for cleaning the production tree and restoring the original appearance of the wellhead, reducing production costs; effectively preventing the problem of freezing and blocking. Brief Description of the Drawings

[0024] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the related art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the related art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0025] Figure 1 Structural schematic diagram of the pressure-relieving clamp head for injection wells provided by the embodiments of the present invention;

[0026] Figure 2 Structural schematic diagram of the pressure-relieving test system for injection wells provided by the embodiments of the present invention.

[0027] Icon:

[0028] 100 - Main body; 200 - Pressure-relieving mechanism; 001 - Test channel; 002 - Pressure-relieving channel; 003 - Pressure-relieving connection hole; 220 - Connecting pipe; 210 - Valve; 230 - Vent pipe; 110 - Boss section; 120 - Circular diameter section; 130 - Boss end face; 131 - Clamping inclined surface; 111 - Sealing steel groove; 140 - Connecting thread; 300 - Connecting clamp; 400 - Pipeline joint. Specific Embodiments

[0029] Example 1

[0030] This embodiment provides a pressure-relieving clamp head for injection wells. Please refer to Figure 1 - Figure 2 simultaneously, which includes a main body 100 and a pressure-relieving mechanism 200. A test channel 001 and a pressure-relieving channel 002 are respectively arranged inside the main body 100 and the pressure-relieving mechanism 200. The test channel 001 and the pressure-relieving channel 002 are connected, and the pressure-relieving mechanism 200 controls the communication or closure of the pressure-relieving channel 002 through opening and closing.

[0031] Before the test construction, operate the pressure-relieving mechanism 200 connected to one side of the main body 100 to open the pressure-relieving channel 002, and part of the liquid is discharged from the pressure-relieving channel 002; at the same time, after the instrument enters the test channel 001, operate the pressure-relieving mechanism 200 to control the full opening of the pressure-relieving channel 002 and empty the liquid in the test channel 001.

[0032] By operating the pressure relief mechanism 200 on the side of the clamp head to control the pressure relief channel 002 for rapid venting and pressure relief, the construction efficiency is improved, and the risk of operating under pressure is avoided. At the same time, after the instrument enters the blowout preventer pipe, the pressure relief mechanism 200 on the side of the clamp head opens the pressure relief channel 002 to drain the liquid in the blowout preventer pipe, avoiding the remaining liquid from contaminating the Christmas tree and the well site, greatly reducing the labor intensity of construction workers to clean the Christmas tree and restore the original appearance of the wellhead, reducing production costs; effectively preventing the problem of freezing and blockage.

[0033] In this embodiment, the pressure relief mechanism 200 includes a valve 210 and a connecting pipe 220. One end of the connecting pipe 220 is in communication with the test channel 001, and the other end is connected to the valve 210.

[0034] In an alternative embodiment of the present embodiment, preferably, the main body 100 of the pressure relief mechanism 200 is a valve 210 and a connecting pipe. When the valve 210 is open, the inside of the pressure relief mechanism 200 is completely open, and the pressure relief channel 002 is in a connected state. When the valve 210 is closed, the inside of the pressure relief mechanism 200 is closed, and all the liquid remains inside the connecting pipe 220 and the test channel 001.

[0035] In this embodiment, the connecting pipe 220 is perpendicular to the test channel 001.

[0036] In an alternative embodiment of the present embodiment, preferably, the material and wall thickness of the connecting pipe 220 have certain requirements. During the test, the maximum test pressure that can be withstood needs to be satisfied to prevent the occurrence of leakage due to closing and rupture.

[0037] In this embodiment, a pressure relief connection hole 003 is provided on the main body 100, and the connecting pipe 220 is inserted into the pressure relief connection hole 003.

[0038] In an alternative embodiment of the present embodiment, preferably, to prevent leakage during liquid passing, a sealing connector is provided between the pressure relief connection hole 003 and the connecting part of the connecting pipe 220, and the thread of the connecting part is coated with thread glue. When processing the pressure relief connection hole 003, attention should also be paid to the size of the hole and its influence on the flow rate of the test flow.

[0039] In this embodiment, the upper section of the main body 100 is a circular diameter section 120, and the lower section of the main body 100 is a convex platform section 110; a convex platform end face 130 is also provided between the convex platform section 110 and the circular diameter section 120, and the convex platform end face 130 connects the circular diameter section 120 and the convex platform section 110.

[0040] In an alternative solution of this embodiment, preferably, the lower part of the choke head body 100 of the injection well is connected and sealed with the test pipeline through a slip steel ring, and its main body 100 is a cylindrical light-transmitting hole. Generally, a plug is installed at the top of the choke head to seal the upper end of the test pipeline. Before the test and well flushing construction, the plug needs to be removed, and then the blowout preventer pipe or well flushing oil pipe can be installed on the choke head before the next construction can be carried out.

[0041] In this embodiment, a clamping inclined surface 131 is provided on the end surface of the boss 130, and the clamping inclined surface 131 slopes downward along the outer wall of the boss section 110; the main body 100 is fixed on the production tree by setting a connecting piece on the clamping inclined surface 131.

[0042] In this embodiment, a sealing steel groove 111 is further provided on the boss section 110, and the sealing steel groove 111 is distributed at the bottom end of the boss section 110.

[0043] In this embodiment, a connecting thread 140 is provided in the test channel 001, and the test channel 001 is connected to the plug through the connecting thread 140.

[0044] In an alternative solution of this embodiment, preferably, the sealing steel groove 111 at the bottom end of the boss section 110 of the choke head body 100 can be placed into a sealing steel ring connected to the paraffin removal gate of the production tree; the choke head is fixed on the production tree through the clamping inclined surface 131 of the choke; the clamping inclined surface 131 is adjacent to the outer wall of the boss section 110. After removing the plug, the test blowout preventer pipe is connected to the choke head body 100 through the connecting thread 140. The test instrument can enter the wellbore of the test system through the test channel 001 provided in the choke head body 100.

[0045] In this embodiment, a drain pipe is further provided at one end of the pressure relief mechanism 200. When the pressure relief mechanism 200 is opened, the drain pipe, the valve 210 and the connecting pipe 220 are connected to relieve pressure.

[0046] In an alternative solution of this embodiment, preferably, the drain pipe is in the liquid discharge part of the pressure relief mechanism 200 to discharge waste liquid and excess liquid from the mechanism. The other end of the valve 210 can also be optionally connected to a pressure gauge.

[0047] In this embodiment, a connecting clamp 300 and a pipeline joint 400 are further included; the connecting clamp 300 fixes the main body 100 on the pipeline joint 400.

[0048] In an alternative solution of this embodiment, preferably, the connecting clamp 300 clamps the clamping inclined surface 131 of the choke head body 100 to fix the choke body 100 in the test pipeline. One end of the choke head body 100 provided with the sealing steel groove 111 is connected to the pipeline joint 400. Generally, a plug is installed at the top of the choke head to seal the test system.

[0049] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A pressure relief clamp head for a water injection well, characterized in that: It comprises a main body (100) and a pressure relief mechanism (200); A testing channel (001) and a pressure relief channel (002) are respectively provided inside the main body (100) and the pressure relief mechanism (200); The test channel (001) is connected to the pressure relief channel (002), and the pressure relief mechanism (200) controls the connection or closure of the pressure relief channel (002) by opening and closing.

2. The pressure relief clamp head for water injection wells according to claim 1, characterized in that: The pressure relief mechanism (200) comprises a valve (210) and a connecting pipe (220); one end of the connecting pipe (220) is connected to the test channel (001), and the other end is connected to the valve (210).

3. The pressure relief clamp head for water injection wells according to claim 2, characterized in that: The connecting pipe (220) is perpendicular to the testing channel (001).

4. The pressure relief clamp head for water injection wells according to claim 3, characterized in that: The main body (100) is provided with a pressure relief connection hole (003), and the connection pipe (220) is plugged into the pressure relief connection hole (003).

5. The pressure relief clamp head for water injection wells according to claim 4, characterized in that: The upper section of the main body (100) is a circular diameter section (120), and the lower section of the main body (100) is a boss section (110); A boss end surface (130) is also provided between the boss section (110) and the circular diameter section (120), and the boss end surface (130) connects the circular diameter section (120) and the boss section (110).

6. The pressure relief clamp head for water injection wells according to claim 5, characterized in that: A clamping slope (131) is provided on the boss end surface (130), and the clamping slope (131) is inclined downward along the outer wall of the boss section (110); and the main body (100) is fixed on the Christmas tree by arranging a connecting piece on the clamping slope (131).

7. The pressure relief clamp head for water injection wells according to claim 6, characterized in that: The boss section (110) is also provided with a sealing steel groove (111), and the sealing steel groove (111) is distributed at the bottom end of the boss section (110).

8. The pressure relief clamp head for water injection wells according to claim 7, characterized in that: A connecting thread (140) is provided in the test channel (001), and the test channel (001) is connected to a thread plug via the connecting thread (140).

9. The pressure relief clamp head for water injection wells according to claim 8, characterized in that: A vent pipe (230) is also provided at one end of the pressure relief mechanism (200); when the pressure relief mechanism (200) is opened, the vent pipe (230), the valve (210) and the connecting pipe (220) are connected to release pressure.

10. A water injection well pressure relief testing system comprising any one of claims 1 to 9, characterized in that: It also includes a connecting clamp (300) and a pipe joint (400); The connecting clamp (300) fixes the main body (100) on the pipe joint (400).

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