Packing device with annulus seal examining function

Abstract

The utility model discloses a packing device with an annulus seal examining function, which comprises a setting pipe column and a well leaving pipe column, and after the setting pipe column and the well leaving pipe column are matched, not only can a pressure channel for seal examining be provided, but also a filling liquid circulation channel can be provided, and a path is provided for circulating sand-carrying fluid. And sealing examination is needed in the bottom filling operation process, and normal construction can be ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of petroleum equipment, in particular to a sealing device with an annulus sealing function. Background Art

[0002] The sealing devices currently used in the market have no sealing inspection mechanism, or can only seal at a low pressure of about 5MPa during sealing inspection, which is not effective.

[0003] However, as major domestic oil fields enter the middle and late stages of development, it is becoming increasingly difficult to exploit replacement reserves, and various requirements have been put forward for supporting products of different reservoir types. For most high-angle wells and horizontal wells, during the bottom filling operation, the sealing device needs to be sealed with an annulus test to 25MPa before the circulating sand filling operation can be carried out. Therefore, the inventor wants to design a sealing device with an annulus test function. Utility Model Content

[0004] The purpose of the utility model is to provide a sealing device with an annulus sealing function in view of the defects of the prior art, which can not only perform annulus sealing and determine the sealing effect of the sealing device, but also has a filling liquid circulation channel to provide a path for circulating sand-carrying liquid.

[0005] The technical solution of the utility model is: a sealing device with annulus sealing function, comprising a setting pipe string and a well retention pipe string, the setting pipe string comprises an upper joint, the inner side of the upper joint is fixedly connected to an upper connecting pipe downward, the upper connecting pipe is fixedly connected to a lower connecting pipe downward, and the lower connecting pipe is rotated downward to connect an inner rotating pipe;

[0006] The outer side of the upper joint is fixedly connected to a hydraulic cylinder, a piston cavity is formed between the hydraulic cylinder and the upper connecting pipe, a piston is slidably connected in the piston cavity, a hydraulic hole connected to the top of the piston cavity is provided on the tube wall of the upper connecting pipe, a ball seat for blocking the hydraulic hole is connected to the interior of the upper connecting pipe through a first shear pin, and an inner step matching the ball seat is provided inside the upper connecting pipe below the ball seat;

[0007] The outer side of the lower connecting pipe is provided with an outer step, and the outer side of the lower connecting pipe between the outer step and the bottom of the upper connecting pipe is provided with a rotating seat, a spring and an inverted joint in sequence from top to bottom, and the outer side of the rotating seat is provided with an upper channel groove, and the outer upper part of the inverted joint is provided with a sealing part, and the lower part is provided with an external threaded part, and the external threaded part is provided with a lower channel groove;

[0008] The well retention pipe string includes a center pipe, a middle channel groove is provided at the top of the cavity of the center pipe, an internal threaded portion is provided below the middle channel groove, an unsealing joint is provided on the outer side of the top of the center pipe, the outer side of the unsealing joint is connected to a pressure ring upward through a second shear pin, a pressure transmission hole is provided on the top of the pressure ring, a locking ring is provided on the outer side of the center pipe below the pressure ring, and the end faces of the locking ring and the center pipe in contact are provided with mutually matching downward one-way teeth, the outer side of the pressure ring is connected downward with a sleeve, and the inner side of the sleeve is provided with a supporting step matching with the bottom of the locking ring, the outer side of the center pipe is located below the sleeve and is equipped with an expansion sealing mechanism and a slip anchoring mechanism in sequence from top to bottom, and the expansion sealing mechanism and the slip anchoring mechanism are driven to work when the sleeve descends.

[0009] After the sealing tubing is inserted into the wellbore tubing, the upper end of the pressure ring extends into the hydraulic cylinder, the internal threaded portion of the center pipe is connected to the external threaded portion of the inverted joint, the sealing portion of the inverted joint is slidably sealed and connected to the inner wall of the center pipe, and the middle channel groove and the lower channel groove are blocked.

[0010] Preferably, the expansion sealing mechanism includes a sleeve, a rubber sleeve and an end ring, the sleeve is located at the bottom of the sleeve and is slidably mounted on the outside of the central tube, the rubber sleeve is located below the sleeve and is slidably mounted on the outside of the sleeve, and the end ring is located below the rubber sleeve and is fixedly mounted on the outside of the sleeve.

[0011] Preferably, a stabilizing ring is provided at the bottom of the wellbore tubular string.

[0012] Preferably, a straightening slope is provided in the cavity of the upper joint for guiding the steel ball dropped into the cavity.

[0013] Preferably, the rotating seat comprises an upper rotating ring and a lower rotating ring which are sleeved on the outer side of the lower connecting tube, an annular ball groove channel is provided between the upper rotating ring and the lower rotating ring, and balls are provided in the ball groove channel.

[0014] Compared with the prior art, the utility model has the following advantages: the advantage of the utility model is that during the bottom filling operation, after the sealing device is sealed, it is necessary to pass the annular seal test to determine the sealing effect of the sealing device, and the sealing pressure can be up to 25MPa, and it can also have a filling liquid circulation channel to provide a path for the circulating sand-carrying liquid, thereby solving the problem that the current highly inclined wells and horizontal wells need to check the seal during the bottom filling operation to ensure normal construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the setting pipe string;

[0016] Figure 2 It is a schematic diagram of the structure of the well-retaining pipe string;

[0017] Figure 3 It is a schematic diagram of the structure of the utility model;

[0018] In the figure: 1, upper joint, 2, steel ball, 3, ball seat, 4, piston, 5, hydraulic cylinder, 6, upper connecting pipe, 7, upper swivel, 8, ball, 9, lower swivel, 10, rotating seat, 11, upper channel groove, 12, spring, 13, sealing part, 14, external thread part, 15, undercut joint, 16, lower channel groove, 17, external step, 18, lower connecting pipe, 19, internal swivel pipe, 20, first shear pin, 21, hydraulic hole, 22. Inner step, 23. Pressure transmission hole, 24. Pressure ring, 25. Unsealing joint, 26. Second shear pin, 27. Locking ring, 28. Support step, 29. Center pipe, 30. Sheath, 31. Sleeve, 32. Rubber sleeve, 33. End ring, 34. Expansion sealing mechanism, 35. Slip anchoring mechanism, 36. Righting ring, 37. Middle channel groove, 38. Internal threaded part, 39. Gap channel, 40. Punch pipe, 41. Righting slope. DETAILED DESCRIPTION

[0019] The utility model is further described below with reference to the accompanying drawings and embodiments. Example 1

[0020] like Figures 1 to 3 A sealing device with an annulus sealing function includes a sealing string and a well retention string. The sealing string includes an upper joint 1. The inner side of the upper joint 1 is fixedly connected to an upper connecting pipe 6 downwardly, and the upper connecting pipe 6 is fixedly connected to a lower connecting pipe 18 downwardly. The lower connecting pipe 18 is rotated downwardly to connect to an inner rotating pipe 19.

[0021] The outer side of the upper joint 1 is fixedly connected to a hydraulic cylinder 5, a piston cavity is formed between the hydraulic cylinder 5 and the upper connecting pipe 6, a piston 4 is slidably connected in the piston cavity, and a hydraulic hole 21 communicating with the top of the piston cavity is provided on the wall of the upper connecting pipe 6.

[0022] The interior of the upper connecting pipe 6 is connected to a ball seat 3 for blocking a hydraulic hole 21 via a first shear pin 20 , and an inner step 22 cooperating with the ball seat 3 is provided inside the upper connecting pipe 6 below the ball seat 3 .

[0023] An outer step 17 is provided on the outer side of the lower connecting tube 18, and a rotating seat 10, a spring 12 and an inverted joint 15 are sequentially mounted on the outer side of the lower connecting tube 18 between the outer step 17 and the bottom of the upper connecting tube 6 from top to bottom.

[0024] A sealing portion 13 is provided at the upper portion of the outer side of the undercut joint 15 , and an external threaded portion 14 is provided at the lower portion, and a lower channel groove 16 is provided at the external threaded portion 14 .

[0025] The rotating seat includes an upper rotating ring 7 and a lower rotating ring 9 which are mounted on the outside of the lower connecting tube 18. An annular ball groove channel is provided between the upper rotating ring 7 and the lower rotating ring 9. Balls 8 are provided in the ball groove channel. An upper channel groove 11 is provided on the outside of the rotating seat 10.

[0026] The wellbore pipe string includes a central pipe 29 . A central channel groove 37 is provided at the top of the cavity of the central pipe 29 . An internal threaded portion 38 is provided below the central channel groove 37 .

[0027] An unsealing joint 25 is provided on the outer side of the top of the central tube 29 . The outer side of the unsealing joint 25 is upwardly connected to a pressure ring 24 through a second shear pin 26 . A pressure transmission hole 23 is provided on the top of the pressure ring 24 .

[0028] A locking ring 27 is provided on the outside of the center tube 29 below the pressure ring 24, and the end faces where the locking ring 27 and the center tube 29 contact are provided with mutually matching downward one-way teeth. The outside of the pressure ring 24 is downwardly connected to a sleeve 30, and the inner side of the sleeve 30 is provided with a supporting step 28 that matches the bottom of the locking ring 27.

[0029] The outer side of the central tube 29 is located below the jacket 30 and is provided with an expansion seal mechanism 34 and a slip anchor mechanism 35 in sequence from top to bottom. The expansion seal mechanism 34 and the slip anchor mechanism 35 are driven to work when the jacket 30 moves downward.

[0030] Among them, the expansion sealing mechanism 34 includes a sleeve 31, a rubber sleeve 32 and an end ring 33. The sleeve is located at the bottom of the sleeve 30 and is slidably mounted on the outside of the central tube 29. The rubber sleeve 32 is located below the sleeve 30 and is slidably mounted on the outside of the sleeve. The end ring 33 is located below the rubber sleeve 32 and is fixedly mounted on the outside of the sleeve 31.

[0031] The expansion sealing mechanism 34 and the slip anchoring mechanism 35 assembled in this application are both structures disclosed in our company's invention patent (patent number: CN202211133765.3).

[0032] After the setting pipe string is inserted into the wellbore pipe string, the upper end of the pressure ring 24 extends into the interior of the hydraulic cylinder 5;

[0033] The internal threaded portion 38 of the center tube 29 is connected to the external threaded portion 14 of the undercut connector 15;

[0034] The sealing portion 13 of the undercut joint 15 is slidably and sealingly connected to the inner wall of the central tube 29 , and blocks the middle channel groove 37 and the lower channel groove 16 .

[0035] Working process:

[0036] 1) Enter the process

[0037] The upper joint 1 at the top of the setting string is connected to the wellhead oil pipe through a short joint and a coupling, and the inner rotating pipe 19 at the bottom of the setting string is downwardly connected to the flushing pipe 40 through a coupling;

[0038] Then the setting string is inserted into the well retention string, so that the pressure ring 24 extends into the hydraulic cylinder 5 and contacts the piston 4;

[0039] The sealing column is rotated to make the external threaded portion 14 of the inverted joint 15 threadedly connected with the internal threaded portion 38 of the center pipe 29. After the threaded connection, the sealing portion 13 of the inverted joint 15 is just in sliding and sealing connection with the inner wall of the center pipe 29, and the middle channel groove 37 and the lower channel groove 16 are blocked at the same time. Then, the utility model is lowered into the well, and the expansion sealing mechanism 34 falls to a position above the liquid level of the oil layer.

[0040] 2) Sealing process

[0041] A steel ball 2 is dropped into the setting string, and it falls on the sealing surface of the ball seat 3 to cooperate with the seal. Well fluid is pumped into the setting string from the wellhead oil pipe to pressurize the steel ball 2. The well fluid pushes the steel ball 2 to drive the ball seat 3 downward to shear the first shear pin 20, leaking out of the hydraulic hole 21. The well fluid flows into the piston cavity from the hydraulic hole 21 to push the piston 4 downward. The piston 4 pushes the pressure ring 24 downward, so that the pressure transmission hole 23 is exposed from the bottom of the hydraulic cylinder 5.

[0042] As the pressure ring 24 moves downward, the second shear pin 26 is cut off, and the pressure ring 24 pushes the sleeve 30 and the locking ring 27 downward. The locking ring 27 cooperates with the center pipe 29 to lock the downward position in one direction. At the same time, the sleeve 30 drives the expansion seal mechanism 34 downward to seal, and drives the slip mechanism to anchor.

[0043] 3) Sealing inspection process

[0044] During the seal inspection, well fluid is injected downward into the annulus between the device and the wellbore casing, and the liquid flows until it reaches the expansion seal mechanism 34 and cannot go down. Part of the liquid flows through the pressure transmission hole 23, the upper channel, and the middle channel in sequence to the sealing part 13 of the inverted joint 15 and cannot go down. At this time, the pressure of the wellbore pressure device increases significantly, indicating that the seal inspection is successful.

[0045] 4) Inverted release process

[0046] Rotating the wellhead oil pipe drives the upper joint 1, the upper connecting pipe 6, the lower connecting pipe 18 and the inverted joint 15 to rotate together. When the inverted joint 15 rotates, the threaded connection with the center pipe 29 is continuously released and moves upward. After the thread is successfully released, the sealing part 13 of the inverted joint 15 moves upward and loses the sealing cooperation with the inner wall of the center pipe 29. At this time, the lower channel groove 16 is connected with the middle channel groove 37.

[0047] It is worth noting that the inverted joint 15 is vertically slidably mounted on the outside of the center tube 29, and the inner hole of the inverted joint 15 and the outer peripheral surface of the sliding fitting part of the center tube 29 adopt a non-circular structure. Therefore, the inverted joint 15 can slide up and down along the center tube 29 and rotate with the center tube 29.

[0048] 5) Cycle filling process

[0049] During filling, the sand-carrying liquid flows downward from the inside of the sealing part to the bottom of the well. The liquid filtered at the bottom of the well goes upward through the gap channel 39 between the sealing pipe string and the lower end of the well retention pipe string, and then passes through the lower channel groove 16, the middle channel groove 37, the upper channel groove 11, and the pressure transmission hole 23 in sequence, and then enters the annulus between the device and the wellbore casing to go upward for cyclic filling operations. Example 2

[0050] This embodiment is further optimized on the basis of the above embodiment, specifically:

[0051] like Figure 3 A stabilizing ring 36 is provided at the bottom of the wellbore pipe string, and the stabilizing ring 36 plays a stabilizing role when the utility model is lowered into the well.

[0052] like Figure 1 and Figure 3 A straightening slope 41 is provided in the cavity of the upper joint 1 for guiding the steel ball 2 put into the cavity. The inclined guiding slope facilitates the put-in steel ball 2 to fall onto the ball seat 3.

[0053] The present invention is not limited to the above-mentioned embodiments. Within the knowledge scope of those skilled in the art, various changes can be made without departing from the purpose of the present invention. The changed contents still belong to the protection scope of the present invention.

Claims

1. A sealing device with annulus sealing function, comprising a setting string and a well retention string, characterized in that: The setting pipe string comprises an upper joint, the inner side of the upper joint is fixedly connected to an upper connecting pipe downward, the upper connecting pipe is fixedly connected to a lower connecting pipe downward, and the lower connecting pipe is rotated downward to connect to an inner rotating pipe; The outer side of the upper joint is fixedly connected to a hydraulic cylinder, a piston cavity is formed between the hydraulic cylinder and the upper connecting pipe, a piston is slidably connected in the piston cavity, a hydraulic hole connected to the top of the piston cavity is provided on the tube wall of the upper connecting pipe, a ball seat for blocking the hydraulic hole is connected to the interior of the upper connecting pipe through a first shear pin, and an inner step matching the ball seat is provided inside the upper connecting pipe below the ball seat; The outer side of the lower connecting pipe is provided with an outer step, and the outer side of the lower connecting pipe between the outer step and the bottom of the upper connecting pipe is provided with a rotating seat, a spring and an inverted joint in sequence from top to bottom, and the outer side of the rotating seat is provided with an upper channel groove, and the outer upper part of the inverted joint is provided with a sealing part, and the lower part is provided with an external threaded part, and the external threaded part is provided with a lower channel groove; The well retention pipe string includes a center pipe, a middle channel groove is provided at the top of the cavity of the center pipe, an internal threaded portion is provided below the middle channel groove, an unsealing joint is provided on the outer side of the top of the center pipe, the outer side of the unsealing joint is connected to a pressure ring upwardly through a second shear pin, a pressure transmission hole is provided on the top of the pressure ring, a locking ring is provided on the outer side of the center pipe below the pressure ring, and the end faces of the locking ring and the center pipe in contact are provided with mutually matching downward one-way teeth, the outer side of the pressure ring is connected downwardly with a sheath, and the inner side of the sheath is provided with a supporting step matching with the bottom of the locking ring, the outer side of the center pipe is located below the sheath, and an expansion sealing mechanism and a slip anchoring mechanism are installed in sequence from top to bottom, and the expansion sealing mechanism and the slip anchoring mechanism are driven to work when the sheath descends; After the sealing tubing is inserted into the wellbore tubing, the upper end of the pressure ring extends into the hydraulic cylinder, the internal threaded portion of the center pipe is connected to the external threaded portion of the inverted joint, the sealing portion of the inverted joint is slidably sealed and connected to the inner wall of the center pipe, and the middle channel groove and the lower channel groove are blocked.

2. The sealing device with annulus sealing function according to claim 1, characterized in that: The expansion sealing mechanism includes a sleeve, a rubber sleeve and an end ring. The sleeve is located at the bottom of the sleeve and is slidably mounted on the outside of the central tube. The rubber sleeve is located below the sleeve and is slidably mounted on the outside of the sleeve. The end ring is located below the rubber sleeve and is fixedly mounted on the outside of the sleeve.

3. The sealing device with annulus sealing function according to claim 1, characterized in that: A stabilizing ring is arranged at the bottom of the wellbore pipe string.

4. The sealing device with annulus sealing function according to claim 1, characterized in that: A straightening slope surface for guiding a steel ball dropped into the cavity is arranged in the cavity of the upper joint.

5. The sealing device with annulus sealing function according to claim 1, characterized in that: The rotating seat comprises an upper rotating ring and a lower rotating ring which are sleeved on the outer side of the lower connecting tube, an annular ball groove channel is arranged between the upper rotating ring and the lower rotating ring, and balls are arranged in the ball groove channel.

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