Anchoring and sealing performance detection device for packer

Abstract

The invention relates to the technical field of oil extraction equipment testing, in particular to a packer anchoring and sealing performance detection device. The packer anchoring and sealing performance detection device comprises a piston rod penetrating into a piston sleeve, a stroke rod is arranged above the piston rod, and a connecting structure connected with a packer is arranged below the piston rod; a limiting device which can fix the position of the stroke rod and can be separated from the stroke rod when conditions are met is arranged between the stroke rod and the piston sleeve, a sleeve is arranged below the piston sleeve, a side pressing opening is formed in the outer wall of the sleeve, a pressing connector is arranged below the sleeve, and a lower pressing opening is formed below the pressing connector. According to the anchoring and sealing performance detection device for the packer, the piston rod and the sleeve are arranged to simulate the underground construction environment, so that the test result is reliable; the stability of the device is kept through the limiting device, and the pressure bearing performance of the packer is detected through the side pressing opening and the lower pressing opening; the device is simple in overall structure, easy and convenient to operate, low in production cost and small in workload.

Description

Technical Field

[0001] The invention relates to the technical field of oil production equipment testing, and in particular to a packer anchoring and sealing performance detection device. Background Art

[0002] In the multi-layer fracturing process of gas wells, due to the high construction pressure and large displacement, the fracturing tubing will creep. The creep of the tubing will cause the displacement of the packer rubber sleeve and thus fail, affecting the construction effect. In order to ensure the success of fracturing, it is necessary to enhance the anchoring performance of the tubing to avoid the occurrence of tubing creep and affect the sealing performance of the packer rubber sleeve. The conventional packer performance detection device in the prior art can only detect the temperature resistance and pressure bearing indicators of the packer, but cannot simulate the downhole construction conditions, and cannot verify the reliability and pressure bearing performance of the packer anchoring performance. It can only detect the anchoring performance of the packer alone. When the anchoring and sealing performance of the packer need to be tested at the same time, it is necessary to build complex packer detection equipment, which has high construction cost and large workload. Therefore, in view of the above shortcomings, a packer anchoring and sealing performance detection device is proposed. Summary of the invention

[0003] 1. Technical issues to be resolved In view of the shortcomings of the prior art, the present invention provides a device for testing the anchoring and sealing performance of a packer, which solves the problems that the downhole construction conditions cannot be simulated when testing the performance of the packer and the data obtained from the test results are incomplete, and professional testing equipment needs to be built when conducting a comprehensive test on the packer, which results in cumbersome operation and high workload.

[0004] (II) Technical solution In order to solve the above problems, the present invention provides a packer anchoring and sealing performance detection device, comprising: A piston rod and a piston sleeve, wherein the piston rod is sleeved into the piston sleeve, and a travel rod is provided above the piston rod; the piston rod is a hollow tube with a sealed top end, and a circumferentially raised sealing step is provided at the bottom end of the inner wall of the piston sleeve, and the inner diameter of the sealing step matches the diameter of the piston rod; a sleeve is provided below the piston sleeve, and a side pressure port is provided on the side wall of the sleeve; a pressure joint is provided below the sleeve, and a lower pressure port is provided below the pressure joint; a limiting device for fixing the position of the travel rod is provided between the top end of the travel rod and the piston sleeve, and the limiting device releases the restriction on the position of the travel rod after being subjected to a certain pressure.

[0005] Preferably, the top end of the piston rod is provided with a circumferentially protruding first step and a second step in sequence from top to bottom, the diameter of the second step is smaller than the first step, and the diameter of the second step is larger than the sealing step.

[0006] Preferably, the diameter of the first step matches the inner diameter of the piston sleeve.

[0007] Preferably, a sealing ring is provided between the first step and the inner wall of the piston sleeve, and a sealing ring is provided between the sealing step and the piston rod.

[0008] Preferably, it is characterized in that a radial through hole is provided on the second step.

[0009] Preferably, a fixing structure connected to the packer is provided below the piston rod, and the height of the side pressure port is higher than the fixing structure and lower than the sealing step.

[0010] Preferably, the limiting device comprises a limiting joint and a shear pin, the limiting joint is fixed between the piston sleeve and the stroke rod, and is connected to the stroke rod via the shear pin.

[0011] Preferably, a plurality of vertically penetrating vent holes are evenly arranged on the limit joint.

[0012] Preferably, the travel rod and the piston rod are detachably connected.

[0013] (III) Beneficial effects The packer anchoring and sealing performance testing device provided by the present invention simulates the underground construction environment by providing a piston rod and installing the packer between the bottom of the piston rod and the sleeve, so as to make the test result more reliable; the anchoring force and the pressure bearing performance of the packer can be measured simultaneously by providing a limit device and a pressure-bearing joint, and the pressure bearing performance of the packer can be comprehensively tested by providing a side pressure-bearing hole on the sleeve; the overall structure of the device is simple, the operation is easy, the production cost is low, and the workload during the testing work is small. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of the packer anchoring and sealing performance detection device of the present invention; Figure 2 This is a working diagram of anchoring force detection of the packer anchoring and sealing performance detection device of the present invention; Figure 3 It is a working diagram of the upper pressure bearing performance detection of the packer anchoring and sealing performance detection device of the present invention; Figure 4 This is a working diagram for testing the lower pressure bearing performance of the packer anchoring and sealing performance testing device of the present invention.

[0015] Among them, 1. limit joint; 2. shear pin; 3. travel rod; 4. piston sleeve; 5. piston rod; 6. sleeve; 7. pressure joint. Implementation

[0016] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0017] In the description of the present invention, it is necessary to understand that the orientations or positional relationships indicated by “upper”, “lower”, “inside”, “outside”, “top”, “bottom”, etc. are all based on the orientations or positional relationships shown in the accompanying drawings. The purpose is only to facilitate the description of the present invention and simplify the description. It does not indicate or imply that the referred parts must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0018] like Figure 1 As shown, the present invention provides a device for testing the anchoring and sealing performance of a packer, specifically comprising: a piston rod 5 and a piston sleeve 4, wherein the piston rod 5 is inserted into the piston sleeve 4 and moves in the piston sleeve 4 in an up-and-down direction, and a connecting structure is provided at the bottom end of the piston rod 5, wherein the connecting structure is used to connect with the packer to be tested, and fix the packer to the piston rod 5, so that the packer transmits the force received to the piston rod 5 during the testing process and can drive the piston rod 5 to move.

[0019] Among them, a circumferentially raised sealing step is provided at the bottom of the inner wall of the piston sleeve 4, and the inner diameter of the sealing step matches the diameter of the piston rod 5. During operation, when the piston rod 5 moves up and down in the piston sleeve 4, the sealing step can always be in close contact with the outer wall of the piston rod 5 to ensure the sealing of the device.

[0020] It should be noted that a sealing ring is provided between the sealing step and the piston rod 5 to further improve the sealing performance of the device, prevent detection failure due to insufficient sealing performance of the device when pressurizing the device during operation, and improve the stability of the device operation.

[0021] In the present invention, a sleeve 6 is provided under the piston sleeve 4. When the device performs a performance test of the packer, the packer is installed on the piston rod 5. At this time, the sleeve 6 is sleeved on the outside of the packer to simulate the downhole working environment, so that the experimental environment of the device is closer to the actual application situation, thereby improving the accuracy of the packer performance obtained after the test.

[0022] The side wall of the sleeve 6 is provided with a side pressure port. During operation, the side pressure port is connected to the pressure head to pressurize the sleeve, thereby testing the pressure bearing capacity of the packer. The side pressure port is located below the sealing step and above the connection structure. When the packer is set in the sleeve 6, pressure is applied to the sleeve 6 through the side pressure port, and the pressure squeezes the packer downward from the top, thereby realizing the detection of the pressure bearing capacity of the packer.

[0023] like Figure 1 As shown, a pressure joint 7 is provided below the sleeve 6, and a lower pressure port is provided on the pressure joint 7. By connecting the lower pressure port with the pressure head, it is possible to pressurize the sleeve 6 from below to test the performance of the packer. When the packer is seated in the sleeve 6, pressure is applied to the sleeve 6 through the lower pressure port, and the pressure squeezes the packer from below to above, thereby realizing the test of the lower pressure bearing capacity of the packer.

[0024] The pressure connector 7 is connected to the bottom of the sleeve 6 by threads, which can not only allow the pressure connector 7 to be freely disassembled but also ensure the stability of the connection between the pressure connector 7 and the sleeve 6 during connection.

[0025] In the present invention, a travel rod 3 is provided above the piston rod 5, and a limit device is provided between the travel rod 3 and the piston sleeve 4. The limit device can limit the position of the travel rod 3 during the sealing process of the packer in the rubber cylinder 6, so that the travel rod 3, the piston rod 5 and the packer can maintain a stable position during the sealing process, prevent the device from being unstable during the sealing process and causing the sealing failure, and improve the working efficiency of the device. At the same time, after the packer is sealed, the limit device continues to pressurize the inside of the device through the side pressure port or the lower pressure port, and the limit device releases the limit state after the pressure reaches the force limit of the limit device. At this time, the travel rod 3 and the piston rod 5 in the device can move up and down under the action of the packer.

[0026] Among them, the limit device in the present invention includes a limit joint 1 and a shear pin 2, the limit joint 1 is sleeved between the travel rod 3 and the piston sleeve 4, the limit joint 1 and the piston sleeve 4 are connected by a thread, and the limit joint 1 and the travel rod 3 are fixed by the shear pin 2. The shear pin 2 can fix the position of the travel rod 3 during the sealing process of the packer. When the pressure in the device is greater than the maximum shear stress that the shear pin 2 can withstand, the shear pin 2 is sheared. At this time, the packer has been successfully sealed. In the subsequent detection link, the positions of the travel rod 3 and the piston rod 5 are no longer fixed, and can move up or down with the change of pressure in the device.

[0027] It should be noted that, in actual applications, depending on the test conditions and test objects on site, the limit device can also be used to achieve the same effect by processing shear threads, gluing, etc. between the limit joint 1 and the travel rod 3.

[0028] like Figure 1 As shown, the outer wall of the piston rod 5 is provided with a first step and a second step of circumferential protrusions from top to bottom in sequence, the outer diameter of the first step matches the inner diameter of the piston sleeve 4, and a sealing ring is provided between the first step and the inner wall of the piston sleeve 4 to improve the sealing performance of the device. The outer diameter of the second step is larger than the inner diameter of the sealing step of the piston sleeve 4 and smaller than the outer diameter of the first step. When the piston rod 5 is inserted into the piston sleeve 4, the second step sits on the sealing step, so that there is an annular gap between the piston rod 5 and the piston sleeve 4. The second step is provided with a radial through hole connecting the annular gap and the space between the piston rod 5. During the working process, when the device is pressurized from the bottom to the top, the pressure enters the annular gap from the piston rod 5 to push the piston rod 5 upward, thereby driving the stroke rod 3 and the packer to move upward; when the device is pressurized from the side pressure port, the packer is forced to move downward to drive the piston rod 5 and the stroke rod 3 to move downward, and the pressure medium flows from the annular gap into the piston rod 5, so that the device can move downward smoothly.

[0029] Among them, the limit joint 1 is evenly provided with a number of vertical through-holes, which connect the gaps between the piston sleeve 4, the piston rod 5 and the travel rod 3 with the outside world. Air can flow into or out of the gaps smoothly to achieve pressure balance, so that the travel rod 3 and the piston rod 5 can move up and down smoothly, ensuring the stability of the device operation and improving the accuracy of the detection results.

[0030] like Figure 2 As shown, when the anchoring force of the packer is performed, the packer is first connected to the bottom end of the piston rod 5. At this time, the sleeve 6 is lowered without installing the pressure joint 7. Instead, a buckle and a protective ring are directly installed at the bottom end of the packer, so that the packer can be directly connected to the pressure head. After the pressure head is connected to the other end of the buckle, the packer is pressurized. At this time, the pressure in the packer rises. When the pressure required for the packer to be sealed is reached, the packer moves to be sealed in the sleeve 6, and then continues to be pressurized. At this time, the pressure enters the annular gap through the piston rod 5 and pushes the piston rod 5 upward. When the pressure reaches the maximum shear stress of the shear pin 2, the shear pin 2 is sheared. At this time, the piston rod 5 and the stroke rod 3 can move up and down in the piston sleeve 4. At this time, the piston sleeve and the piston rod produce relative displacement. By recording the cross-sectional area and pressure of the piston sleeve and the piston rod, the anchoring force of the packer under the design pressure can be calculated.

[0031] like Figure 3 As shown, after the anchoring force test of the packer, the pressure is released to 0 MPa, the pressure head is removed and connected to the side pressure port, and the pressure is applied to the device through the side pressure port. At this time, the pressure is between the top of the packer and the piston sleeve 4. During this process, the packer always remains in a seated state, and the pressure ports are pressurized to the design requirements in turn, and the pressure is maintained stable for 5 minutes. If there is no abnormality in the whole process, it proves that the packer has good pressure-bearing performance.

[0032] like Figure 4 As shown, after the pressure-bearing performance of the packer is tested, the pressure is released to 0 MPa, the pressure head is removed, and the pressure joint 7 is installed below the rubber cylinder 6. The pressure head is connected to the lower pressure port and pressure is applied to the device. At this time, the pressure acts on the lower side of the packer to push the packer upward. During this process, the packer always remains in a seated state, and the pressure ports are pressurized to the design requirements in turn, and the pressure is maintained stable for 5 minutes. If there is no abnormality in the whole process, it proves that the packer has good pressure-bearing performance.

[0033] The packer anchoring and sealing performance detection device provided by the present invention can simulate the working environment downhole to detect the anchoring performance of the packer, and can detect the anchoring force and pressure bearing performance of the packer without the need for additional equipment. It has a simple structure, convenient operation, low construction cost, and small workload. The specific operation process of the device is as follows: Step 1: Connect the device, connect the packer to the piston rod, install the protection ring and the buckle at the lower end of the packer, connect the buckle to the pressure head, then install the pressure pipe joint on the pressure head, and pressurize the packer. At this time, when the pressure reaches the packer setting pressure, the packer is set, and then continue to pressurize until the pressure is greater than the shear stress limit of the shear pin. When the shear pin is sheared, the piston sleeve and the piston rod will have a relative displacement. By recording the cross-sectional area and pressure of the piston sleeve and the piston rod, the anchoring force of the packer under the design pressure is calculated.

[0034] Step 2: Release the pressure to 0MPa, disassemble the pressure pipeline, connect the pressure head to the side pressure port, install the pressure pipeline joint on the pressure head, and perform pressure as required. At this time, the packer is still in the set state, and the pressure enters the sleeve from the side pressure port to exert pressure on the packer downward, and pressurizes to the design value in turn, and stabilizes the pressure for 5 minutes respectively. If there is no abnormality during the whole process, the pressure of the packer is stable and there is no leakage and displacement, which proves that the packer has good pressure resistance.

[0035] Step 3: Release the pressure to 0MPa, disassemble the pressure pipeline, install the pressure joint under the sleeve, connect the pressure head to the lower pressure port, install the pressure pipeline joint on the pressure head, and perform pressure as required. At this time, the packer remains in the set state, and the pressure enters the sleeve from the lower pressure port and enters the annular space to push upward to apply pressure to the packer, and pressurize to the design value in turn, and stabilize the pressure for 5 minutes respectively. If there is no abnormality during the whole process, the packer is in good pressure stabilization without leakage and displacement, which proves that the packer has good pressure resistance.

[0036] Step 4: Release the pressure to 0 MPa, dismantle the device, clean it and recycle it.

[0037] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A packer anchoring and sealing performance detection device, characterized in that: include: A piston rod (5) and a piston sleeve (4), wherein the piston rod (5) is sleeved into the piston sleeve (4), and a travel rod (3) is provided above the piston rod (5); the piston rod (5) is in the shape of a hollow tube with a sealed top end, and a circumferentially protruding sealing step is provided at the bottom end of the inner wall of the piston sleeve (4), and the inner diameter of the sealing step matches the diameter of the piston rod (5); a sleeve (6) is provided below the piston sleeve (4), and a side pressure-pressing port is provided on the side wall of the sleeve (6); a pressure-pressing joint (7) is provided below the sleeve (6), and a lower pressure-pressing port is provided below the pressure-pressing joint (7); a limiting device for fixing the position of the travel rod (3) is provided between the top end of the travel rod (3) and the piston sleeve (4), and the limiting device releases the restriction on the position of the travel rod (3) after being subjected to a certain pressure.

2. The packer anchoring and sealing performance detection device according to claim 1, characterized in that: The outer wall of the piston rod (5) is provided with a circumferentially protruding first step and a second step in sequence from top to bottom, the diameter of the second step is smaller than the first step, and the diameter of the second step is larger than the sealing step.

3. The packer anchoring and sealing performance detection device according to claim 2, characterized in that: The diameter of the first step matches the inner diameter of the piston sleeve (4).

4. The packer anchoring and sealing performance detection device according to claim 2, characterized in that: A sealing ring is provided between the first step and the inner wall of the piston sleeve (4), and a sealing ring is provided between the sealing step and the piston rod (5).

5. The packer anchoring and sealing performance detection device according to claim 2, characterized in that: The second step is provided with a radial through hole.

6. The packer anchoring and sealing performance detection device according to claim 1, characterized in that: A fixing structure connected to the packer is provided below the piston rod (5), and the height of the side pressure port is higher than the fixing structure and lower than the sealing step.

7. The packer anchoring and sealing performance detection device according to claim 1, characterized in that: The limiting device comprises a limiting joint (1) and a shear pin (2); the limiting joint (1) is fixed between the piston sleeve (4) and the travel rod (3), and is connected to the travel rod (3) via the shear pin (2).

8. The packer anchoring and sealing performance detection device according to claim 7, characterized in that: The limit joint (1) is evenly provided with a plurality of vertically penetrating vent holes.

9. The packer anchoring and sealing performance detection device according to claim 1, characterized in that: The travel rod (3) and the piston rod (5) are detachably connected.

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