Float collar and float shoe pressure bearing testing device

Abstract

The invention belongs to the field of downhole tool testing, and particularly relates to a float collar and float shoe pressure bearing testing device. The invention aims to solve the problems that a device for testing the pressure of a float collar and a float shoe in a non-threaded connection sealing mode in the prior art is poor in applicability and does not have universality, and the operations of dismounting and mounting the float collar and the float shoe or replacing a sealing head are not simple and convenient enough. The device comprises a rack, a moving device, a loading hydraulic cylinder, a gear and a pressure-bearing test cylinder, a moving device is mounted on the rack, and a sealing seat capable of moving along the moving device is fixed on the moving device; the pressure-bearing test cylinder comprises a sealing seat, a union gear ring and a sealing cylinder; the sealing cylinder is fixed to the sealing seat through meshing of the union gear ring and the gear. The pressure-bearing test cylinder is used for carrying out pressure-bearing test on the float collar and the float shoe; the loading hydraulic cylinder is used for installing the sealing cylinder on the sealing seat, and the loading hydraulic cylinder is fixed to the rack. According to the invention, the sealing performance test of float collars and float shoes of different specifications and sizes of various manufacturers can be realized, the operation is convenient, and the test efficiency is greatly improved.

Description

Technical Field

[0001] The present invention belongs to the field of downhole tool testing, and particularly relates to a floating collar and floating shoe pressure-bearing test device. Background Art

[0002] Floating collars and floating shoes are essential accessories in cementing operations, playing a crucial role in cementing operations and being used in large quantities. Once the floating collar and floating shoe fail, it will result in an overly high cement plug in the casing, poor annulus sealing effect, and seriously affect the cementing quality. Therefore, the pressure-bearing capacity of floating collars and floating shoes is an important indicator for cementing construction, and it is crucial to detect their pressure-bearing performance before the floating collar and floating shoe are lowered into the well.

[0003] Currently, the pressure test for the sealing and pressure-bearing performance of floating collars and floating shoes is mainly carried out by connecting a pressure test joint, which requires machining different pressure test joints. Especially in recent years, special threads and non-conventional size floating collars and floating shoes are more and more widely used, and it is even more necessary to match various threads and sizes of pressure test joints, resulting in high processing costs; moreover, the labor intensity of frequently installing and removing the pressure test joint is large, and it is easy to damage the threads, which seriously affects the test efficiency and economy.

[0004] Some manufacturers also use a non-threaded connection sealing method to conduct a pressure test on floating collars and floating shoes, but there are two problems: one is that it can only be applied to the floating collars and floating shoes produced by themselves and cannot be applied to floating collars and floating shoes from different manufacturers because the outer diameters and lengths of floating collars and floating shoes from different manufacturers have certain differences; the other is that the operation of disassembling and assembling the floating collar and floating shoe or replacing the sealing head is not simple and convenient enough.

[0005] Based on this, the present invention proposes a floating collar and floating shoe pressure-bearing test device. Summary of the Invention

[0006] In order to solve the above problems in the prior art, that is, the device for conducting a pressure test on floating collars and floating shoes by using a non-threaded connection sealing method in the prior art has poor applicability and universality, and the operation of disassembling and assembling the floating collar and floating shoe or replacing the sealing head is not simple and convenient enough, the present invention provides a floating collar and floating shoe pressure-bearing test device, which includes a bench, a moving device, a loading hydraulic cylinder, a gear, and a pressure-bearing test cylinder;

[0007] The bench is placed on the ground, a moving device is installed on the bench, and a sealing seat capable of moving along it is fixed on the moving device;

[0008] The pressure-bearing test cylinder includes a sealing seat, a split ring gear, and a sealing cylinder; the sealing cylinder is fixed to the sealing seat through the meshing of the split ring gear and the gear; the pressure-bearing test cylinder is used to conduct a pressure test on the floating collar and floating shoe;

[0009] The gear is driven by a driving device, and the driving device is fixed to the bench;

[0010] The loading hydraulic cylinder is used to install the sealing cylinder on the sealing seat, and the loading hydraulic cylinder is fixed to the bench.

[0011] In some preferred embodiments, the bench includes a base, a fixed column and a cross beam;

[0012] The base is placed on the ground, a moving device is installed on the base, the base is fixed to the cross beam through the fixed column, and the cross beam is fixed to the loading hydraulic cylinder.

[0013] In some preferred embodiments, the moving device includes a sliding guide rail and a sliding base;

[0014] The sliding guide rail is fixed to the base, a sliding base capable of moving along it is arranged on the sliding guide rail, and the sliding base is fixed to the sealing seat.

[0015] In some preferred embodiments, the pressure-bearing test cylinder further includes a nut, a sealing sleeve, an end face lip seal and a radial compression sealing ring;

[0016] A through hole is provided in the middle of the sealing seat, which is used to observe whether there is leakage of the float collar and float shoe during the pressure-bearing test, and is also used to drain the liquid in the sealing cylinder after the pressure-bearing test;

[0017] A radial compression sealing ring is installed on the bottom surface inside the sealing seat, and the outer circle of the float collar and float shoe is sealed by the sealing ring pressure port, and the sealing ring pressure port is opened on the outer circumferential surface of the sealing seat;

[0018] A first shoulder is provided on the inner circumferential surface of the sealing seat, a sealing sleeve is installed on the first shoulder, and the first shoulder and the sealing sleeve are sealed and connected through an end face lip seal;

[0019] The sealing sleeve is sealed and connected to the sealing cylinder through the end face lip seal, a nut is fixed to the upper part of the sealing cylinder, and the nut is used to connect the loading hydraulic cylinder; a second shoulder is provided on the lower end of the sealing cylinder along its outer circumferential surface, and the second shoulder is used to lap with the optional gear ring, the inner circumferential surface of the optional gear ring is threadedly connected to the sealing seat, and the optional gear ring is engaged with the gear;

[0020] A workpiece pressure hole is provided on the outer circumferential surface of the sealing cylinder, and a water injection hole is provided on the end face at the top of the sealing cylinder. The water injection hole and the workpiece pressure hole are used for rapid water injection and pressurizing the workpiece.

[0021] In some preferred embodiments, the upper part of the sealing sleeve is provided with a thin boss, and a plurality of horizontally penetrating through holes are evenly distributed on the thin boss for hoisting the sealing sleeve.

[0022] In some preferred embodiments, the axes of the nut, the sealing seat, the sealing cylinder, and the loading cylinder are on the same straight line.

[0023] In some preferred embodiments, the optional gear ring and the sealing seat are coaxially arranged.

[0024] In some preferred embodiments, the driving device includes a motor, the output shaft of the motor is coaxially fixed with the gear, and the motor is fixed to the base.

[0025] In some preferred embodiments, at least one set of the moving device, the loading cylinder, and the pressure-bearing test cylinder is arranged on the base.

[0026] In some preferred embodiments, the thread at the threaded connection between the inner circumferential surface of the optional gear ring and the sealing seat includes a large trapezoidal thread.

[0027] Advantages of the present invention:

[0028] By quickly replacing the radially compressed sealing ring and the sealing sleeve installed in the sealing seat, the present invention can realize the sealing performance test of float collars and float shoes with different specifications and sizes from various manufacturers, which is convenient to operate and greatly improves the test efficiency. It solves the problems that current float collar and float shoe pressure testing requires connecting pressure testing joints of various sizes and thread types, with high processing costs, high labor intensity, low test efficiency, and easy damage to the threads. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] By reading the detailed description of the non-limiting embodiments with reference to the following drawings, other features, objects, and advantages of the present application will become more apparent:

[0030] Figure 1 is the overall structural schematic diagram of a float collar and float shoe pressure-bearing test device of the present invention;

[0031] Figure 2 is the internal structural schematic diagram of the pressure-bearing test cylinder in a float collar and float shoe pressure-bearing test device of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0032] The following further details the present application in conjunction with the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the relevant invention, rather than limiting the invention. Additionally, it should be noted that for the sake of description, only parts related to the relevant invention are shown in the drawings.

[0033] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present application will be described in detail below with reference to the drawings and embodiments.

[0034] As Figure 1 、 Figure 2 shown, refer to Figure 1 , the present invention provides a pressure-bearing test device for a float collar and a float shoe, which device includes a bench, a moving device, a loading hydraulic cylinder 5, a gear 8 and a pressure-bearing test cylinder 7;

[0035] The bench is placed on the ground, a moving device is installed on the bench, and a seal seat 9 capable of moving along it is fixed on the moving device;

[0036] The pressure-bearing test cylinder 7 includes a seal seat 9, a master gear ring 10 and a seal cylinder 11; the seal cylinder 11 is fixed to the seal seat 9 through the meshing of the master gear ring 10 and the gear 8; the pressure-bearing test cylinder 7 is used for conducting a pressure-bearing test on the float collar and the float shoe 15;

[0037] The gear 8 is driven by a driving device, and the driving device is fixed to the bench;

[0038] The loading hydraulic cylinder 5 is used for installing the seal cylinder 11 on the seal seat 9, and the loading hydraulic cylinder 5 is fixed to the bench.

[0039] As a further explanation of the present invention, refer to Figure 1 、 Figure 2 , the bench includes a base 1, fixed columns 4 and a cross beam 6;

[0040] The base 1 is placed on the ground, a moving device is installed on the base 1, the base 1 is fixed to the cross beam 6 through the fixed columns 4, and the cross beam 6 is fixed to the loading hydraulic cylinder 5.

[0041] Among them, in this embodiment, the cross beam 6 and the base 1 are connected and fixed into one body through 6 fixed columns 4.

[0042] As a further explanation of the present invention, refer to Figure 1 、 Figure 2 , the moving device includes a sliding guide rail 2 and a sliding base 3;

[0043] The sliding guide rail 2 is fixed to the base 1, a sliding base 3 capable of moving along it is arranged on the sliding guide rail 2, and the sliding base 3 is fixed to the seal seat 9.

[0044] Among them, the way of fixing the sliding guide rail 2 to the base 1 includes bolt fixing.

[0045] Among them, the sliding guide rail 2 is a T-shaped sliding guide rail in this embodiment.

[0046] As a further explanation of the present invention, refer to Figure 2The pressure test tube 7 also includes a nut 13, a sealing sleeve 16, an end face flood seal 17 and a radial compression seal ring 18;

[0047] A through hole is provided in the middle of the sealing seat 9, and the through hole is used to observe whether the floating collar and the floating shoe 15 leak during the pressure test, and is also used to discharge the liquid in the sealing tube 11 after the pressure test is completed;

[0048] A radial compression seal ring 18 is installed on the bottom surface of the seal seat 9. The radial compression seal ring 18 seals the outer circumference of the float collar and float shoe 15 through a seal ring pressurizing port 19. The seal ring pressurizing port 19 is opened on the outer circumferential surface of the seal seat 9.

[0049] The inner circumferential surface of the sealing seat 9 is provided with a first shoulder, a sealing sleeve 16 is mounted on the first shoulder, and the first shoulder and the sealing sleeve 16 are sealed and connected via an end face flood seal 17;

[0050] The sealing sleeve 16 is sealed and connected with the sealing cylinder 11 through the end face pan seal 17. A nut 13 is fixed on the upper part of the sealing cylinder 11, and the nut 13 is used to connect the loading liquid cylinder 5. The lower end of the sealing cylinder 11 is provided with a second shoulder along its outer circumferential surface, and the second shoulder is used to overlap with the Youren gear ring 10. The inner circumferential surface of the Youren gear ring 10 is threadedly connected with the sealing seat 9, and the Youren gear ring 10 is meshed with the gear 8.

[0051] A workpiece pressurizing hole 12 is provided on the outer circumferential surface of the sealing cylinder 11 , and a water injection hole 14 is provided on the end surface of the top of the sealing cylinder 11 . The water injection hole 14 and the workpiece pressurizing hole 12 are used for rapid water injection and pressurizing the workpiece.

[0052] The loading fluid cylinder 5 is mainly used to insert / pull out the sealing cylinder 11 from / to the sealing seat 9, and the gear 8 is mainly used to tighten / loosen the gear ring 10 and the sealing seat 9, thereby connecting and fastening the sealing cylinder 11 and the sealing seat 9.

[0053] When the radial compression sealing ring 18 is pressurized through the sealing ring pressurizing port 19 on the sealing seat 9 , the radial compression sealing ring 18 will be compressed to hold the floating collar and the floating shoe 15 tightly to make it centered, thereby realizing the outer circle sealing of the floating collar and the floating shoe 15 .

[0054] When the sealing sleeve 16 is in full contact with the first shoulder to form a seal, the lip of the radial compression sealing ring 18 is compressed in the axial direction, and a closed space is formed among the sealing sleeve 16 , the sealing seat 9 , and the radial compression sealing ring 18 .

[0055] The radial compression seal ring 18 and the seal sleeve 16 are used together and can be quickly replaced to meet the pressure test of the float collar and float shoe 15 of different specifications and sizes.

[0056] For a further explanation of the present invention, refer to Figure 2 , a thin boss is provided on the upper part of the sealing sleeve 16, and a plurality of horizontally penetrating through holes are evenly distributed on the thin boss for hoisting the sealing sleeve 16.

[0057] For a further explanation of the present invention, refer to Figure 2 , the axes of the nut 13, the sealing seat 9, the sealing cylinder 11 and the loading hydraulic cylinder 5 are located on a straight line.

[0058] For a further explanation of the present invention, refer to Figure 2 , the arbitrary gear ring 10 and the sealing seat 9 are coaxially arranged.

[0059] For a further explanation of the present invention, refer to Figure 2 , the driving device includes a motor, the output shaft of the motor is coaxially fixed with the gear 8, and the motor is fixed to the base 1.

[0060] For a further explanation of the present invention, refer to Figure 1 , at least one group of the moving device, the loading hydraulic cylinder 5 and the pressure-bearing test cylinder 7 is arranged on the base 1.

[0061] For a further explanation of the present invention, refer to Figure 2 , the thread at the threaded connection between the inner circumferential surface of the arbitrary gear ring 10 and the sealing seat 9 includes a large trapezoidal thread.

[0062] Refer to Figure 1 , Figure 2 , when the present invention is in use, it includes the installation of the float collar and float shoe 15, the pressure-bearing test of the float collar and float shoe 15, and the removal of the float collar and float shoe 15. Specifically:

[0063] 1. Installation of the float collar and float shoe 15: First, move the sealing seat 9 suitable for the size of the float collar and float shoe 15 outside the table surface of the base 1, install the matching radially compressed sealing ring 18 and the sealing sleeve 16 into the sealing seat 9, and then place the female threaded end of the float collar and float shoe 15 vertically downward into the sealing sleeve 16, the radially compressed sealing ring 18 and the sealing seat 9. There is a large gap between the radially compressed sealing ring 18 and the float collar and float shoe 15 to facilitate the placement of the float collar and float shoe 15. Move the sealing seat 9 with the installed float collar and float shoe 15 to the table surface of the base 1 to the defined position, so that the central axis of the sealing seat 9 coincides with the central axes of the sealing cylinder 11 and the loading hydraulic cylinder 5. Start the loading hydraulic cylinder 5 to press the sealing cylinder 11 into the sealing seat 9, so that the end face of the sealing cylinder 11, the end face of the sealing sleeve 16 and the first shoulder face of the sealing seat 9 are in complete contact and sealed. Then start the gear 8 to screw the arbitrary gear ring 10 into place to firmly connect the arbitrary gear ring 10 with the sealing seat 9.

[0064] 2. Casing Collar Float Shoe 15 Pressure Test: Start the first path of the pressure test system to pressurize the radial compression seal ring 18 from the seal ring pressure port 19 to the initial sealing pressure, so that the radial compression seal ring 18 compresses and holds the casing collar float shoe 15 tightly and seals the outer circle of the casing collar float shoe 15. At this time, a closed space is formed inside the seal cylinder 11. Open the injection water pump to fill the seal cylinder 11 with liquid from the water injection hole 14 and close the liquid injection hole. Then start the second path of the pressure test system to pressurize the seal cylinder 11 from the workpiece pressure port 12. When the pressure rises to the same as that of the first path, start the first and second paths to pressurize the radial compression seal ring 18 and the seal cylinder 11 simultaneously until the test pressure. Keep the pressure and record the pressure test curve. Whether the casing collar float shoe 15 leaks can be observed through the through hole opened at the bottom of the seal seat 9. After the test is completed, the first and second paths are depressurized synchronously to complete the pressure test.

[0001] 3. Removal of Casing Collar Float Shoe 15: After depressurization, the radial compression seal ring 18 returns to its original state. The liquid inside the seal cylinder 11 flows out through the through hole at the bottom of the seal seat 9 from the annular gap between the radial compression seal ring 18 and the casing collar float shoe 15. After the liquid inside the seal cylinder 11 is drained completely, start the gear 8 to completely uncouple the free tooth ring 10. Then start the loading cylinder 5 to lift the seal cylinder 11 away from the seal seat 9, move the seal seat 9 outside the base 1 tabletop, and finally remove the casing collar float shoe 15.

[0002] The terms "first", "second", etc. are used to distinguish similar objects, rather than to describe or represent a specific order or sequence.

[0003] The term "comprising" or any other similar term is intended to cover non-exclusive inclusion, so that a process, method, article, or device / equipment including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or also includes elements inherent to these processes, methods, articles, or devices / equipment.

[0004] So far, the technical solution of the present invention has been described in conjunction with the preferred embodiments shown in the drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

Claims

1. A pressure-bearing test device for a float collar and a float shoe, characterized in that, the device comprises a bench, a moving device, a loading hydraulic cylinder (5), a gear (8) and a pressure-bearing test cylinder (7); the bench is placed on the ground, a moving device is installed on the bench, and a sealing seat (9) capable of moving along it is fixed on the moving device; the pressure-bearing test cylinder (7) comprises a sealing seat (9), a master gear ring (10) and a sealing cylinder (11); the sealing cylinder (11) is fixed to the sealing seat (9) through the meshing of the master gear ring (10) and the gear (8); the pressure-bearing test cylinder (7) is used for conducting a pressure-bearing test on the float collar and the float shoe (15); the gear (8) is driven by a driving device, and the driving device is fixed to the bench; the loading hydraulic cylinder (5) is used for installing the sealing cylinder (11) on the sealing seat (9), and the loading hydraulic cylinder (5) is fixed to the bench.

2. The pressure-bearing test device for a float collar and a float shoe according to claim 1, characterized in that, the bench comprises a base (1), a fixing column (4) and a cross beam (6); the base (1) is placed on the ground, a moving device is installed on the base (1), the base (1) is fixed to the cross beam (6) through the fixing column (4), and the cross beam (6) is fixed to the loading hydraulic cylinder (5).

3. The pressure-bearing test device for a float collar and a float shoe according to claim 2, characterized in that, the moving device comprises a sliding guide rail (2) and a sliding base (3); the sliding guide rail (2) is fixed to the base (1), a sliding base (3) capable of moving along it is arranged on the sliding guide rail (2), and the sliding base (3) is fixed to the sealing seat (9).

4. The pressure-bearing test device for a float collar and a float shoe according to claim 3, characterized in that, the pressure-bearing test cylinder (7) further comprises a nut (13), a sealing sleeve (16), an end face lip seal (17) and a radial compression sealing ring (18); a through hole is arranged in the middle of the sealing seat (9), the through hole is used for observing whether the float collar and the float shoe (15) leak during the pressure-bearing test, and is also used for discharging the liquid in the sealing cylinder (11) after the pressure-bearing test; a radial compression sealing ring (18) is installed on the bottom surface inside the sealing seat (9), and the radial compression sealing ring (18) seals the outer circle of the float collar and the float shoe (15) through a sealing ring pressure port (19), and the sealing ring pressure port (19) is opened on the outer circumferential surface of the sealing seat (9); a first shoulder is arranged on the inner circumferential surface of the sealing seat (9), a sealing sleeve (16) is installed on the first shoulder, and the first shoulder and the sealing sleeve (16) are sealed and connected through an end face lip seal (17); The sealing sleeve (16) is sealingly connected to the sealing cylinder (11) through the end face lip seal (17). A nut (13) is fixed to the upper part of the sealing cylinder (11), and the nut (13) is used to connect the loading hydraulic cylinder (5); a second shoulder is arranged on the lower end of the sealing cylinder (11) along its outer circumferential surface, and the second shoulder is used to lap with the random gear ring (10). The inner circumferential surface of the random gear ring (10) is threadedly connected to the sealing seat (9), and the random gear ring (10) meshes with the gear (8); A workpiece pressurizing hole (12) is formed on the outer circumferential surface of the sealing cylinder (11), and a water injection hole (14) is formed on the end face at the top of the sealing cylinder (11). The water injection hole (14) and the workpiece pressurizing hole (12) are used for quickly injecting water and pressurizing the workpiece.

5. A floating collar and floating shoe pressure-bearing test device according to claim 4, characterized in that, The upper part of the sealing sleeve (16) is provided with a thin boss, and a plurality of horizontally penetrating through holes are evenly distributed on the thin boss for hoisting the sealing sleeve (16).

6. A floating collar and floating shoe pressure-bearing test device according to claim 5, characterized in that, The axes of the nut (13), the sealing seat (9), the sealing cylinder (11) and the loading hydraulic cylinder (5) are located on a straight line.

7. A floating collar and floating shoe pressure-bearing test device according to claim 6, characterized in that, The random gear ring (10) and the sealing seat (9) are coaxially arranged.

8. A floating collar and floating shoe pressure-bearing test device according to claim 7, characterized in that, The driving device includes a motor, the output shaft of the motor is coaxially fixed to the gear (8), and the motor is fixed to the base (1).

9. A floating collar and floating shoe pressure-bearing test device according to claim 8, characterized in that, At least one set of the moving device, the loading hydraulic cylinder (5) and the pressure-bearing test cylinder (7) is arranged on the base (1).

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