Pressure resistance simulation test system for packer

Abstract

The utility model discloses a pressure resistance simulation test system for a packer, and belongs to the technical field of packer performance inspection. According to the utility model, the problem that manpower, material resources, financial resources and time are consumed due to the fact that the pressure-resistant test of the existing packer needs to be carried out under the underground working condition is solved. The fixed section of the hydraulic cylinder is fixedly connected with one end of the casing pipe, the movable end of the hydraulic cylinder is located in the casing pipe, the packer is coaxially inserted into the casing pipe, the movable end of the hydraulic cylinder is inserted into one end of a packer center pipe in a sealed mode, and a tension sensor is arranged between the inner wall of one end of the casing pipe and the movable end of the hydraulic cylinder. The plug is fixedly installed at the other end of the casing pipe in a sealed mode, and the three pressure testing pumps are connected to the other end of the pressing connector, the side wall of the casing pipe corresponding to the upper annular space of the packer and the side wall of the casing pipe corresponding to the lower annular space of the packer through pipelines respectively. Under the ground condition, the underground working condition can be simulated, delivery inspection is conducted on the packer, the structure is simple, and practicability is high.

Description

Technical Field

[0001] The utility model relates to a packer pressure resistance simulation test system and belongs to the technical field of packer performance inspection. Background Art

[0002] The packer is mainly used for stratified water injection and polymer injection wells with micro-deformation of downhole casing, serious scaling at the bottom of the well, or large well inclination and depth. In the prior art, in the early stage of design and development of the packer, it is necessary to go down the well for testing to collect various technical parameters of the packer. The downhole test is not only time-consuming, but also extremely labor-intensive and material-intensive, resulting in high research and development costs. For this reason, some simulated downhole packer test devices have appeared in the prior art. However, these test devices are generally not very versatile and cannot simulate the process of backwashing the water injection well packer. Therefore, the backwashing function of the K series and Y series packers with backwashing function cannot be tested; at the same time, the existing test devices cannot verify the release force of the packer. Therefore, there is an urgent need for a test system for factory inspection of packers that can simulate downhole working conditions on the ground to save manpower, financial resources, material resources and time. Utility Model Content

[0003] The utility model is to solve the above technical problems and further provides a packer pressure simulation test system.

[0004] The technical solution adopted by the utility model to solve the above technical problems is:

[0005] A packer pressure simulation test system comprises a hydraulic cylinder, a casing, a plug and a pressure test pump, wherein a fixed section of the hydraulic cylinder is fixedly connected to one end of the casing, a movable end of the hydraulic cylinder is located inside the casing, a packer is coaxially inserted in the casing, and the movable end of the hydraulic cylinder is sealed and inserted into one end of a center pipe of the packer, and a tension sensor is arranged between the inner wall of one end of the casing and the movable end of the hydraulic cylinder.

[0006] The plug is sealably fixed on the other end of the casing, a pressure joint is connected and fixed on the plug, and one end of the pressure joint is connected to the other end of the center pipe of the packer. There are three pressure test pumps, which are respectively connected to the other end of the pressure joint, the casing side wall corresponding to the upper annulus of the packer, and the casing side wall corresponding to the lower annulus of the packer through pipelines.

[0007] Furthermore, the fixed section of the hydraulic cylinder is sleeved with a first flange, one end of the sleeve is sleeved with a second flange, and the first flange is butt-jointed with the second flange and fixedly connected by a plurality of bolts.

[0008] Furthermore, a first pressure test tube is fixedly installed on the casing side wall corresponding to the upper annulus of the packer, and a second pressure test tube is fixedly installed on the casing side wall corresponding to the lower annulus of the packer. Two pressure test pumps are connected to the first pressure test tube and the second pressure test tube through pipelines respectively, and each pressure test tube is connected to a pressure gauge.

[0009] Furthermore, high-pressure valves are provided on both pressure test tubes.

[0010] Furthermore, the first pressure test tube and the second pressure test tube are both three-way tubes.

[0011] Furthermore, an outer wall of one end portion of the sleeve is threadedly connected to an inner wall of the second flange.

[0012] Furthermore, the outer wall of the other end of the sleeve is threadedly connected to the inner wall of the plug.

[0013] Furthermore, a bracket is provided below the hydraulic cylinder, and a plurality of legs are arranged below the sleeve.

[0014] Furthermore, a plurality of universal wheels are arranged at the bottom of the bracket, and a plurality of legs are evenly distributed along the length direction of the sleeve.

[0015] Furthermore, the hydraulic cylinder is a double-section hydraulic cylinder.

[0016] Compared with the prior art, the utility model has the following effects:

[0017] The casing is used to simulate the wellbore, and the three pressure test pumps are used to pressurize the center pipe, upper annulus and lower annulus of the packer, thereby realizing the simulation of the setting of the packer and the backwashing working state of the downhole packer, and the hydraulic cylinder is used to simulate the unsealing of the packer; the size of the unsealing force of the packer is tested by extending the movable end of the hydraulic cylinder and setting the tension sensor.

[0018] The packer pressure resistance simulation test system described in the utility model can simulate the underground working conditions under ground conditions and perform factory inspection on the packer. It has a simple structure and strong practicality. Compared with the existing factory inspection of the packer through underground experiments, it greatly saves manpower, financial resources, material resources and time. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a partial cross-sectional view of the main schematic diagram of the utility model.

[0020] In the figure:

[0021] 1. Hydraulic cylinder; 2. Casing; 3. Plug; 4. Pressure test pump; 5. Packer; 5-1. Center pipe; 5-2. Upper annular control; 5-3. Lower annulus; 5-4. Packer; 6. Tension sensor; 7. Pressure joint; 8. Hydraulic station; 9. First flange; 10. Second flange; 11. Bolt; 12. First pressure test tube; 13. Second pressure test tube; 14. Pressure gauge; 15. Quick connector; 16. High-pressure valve; 17. Bracket; 18. Leg; 19. Universal wheel. DETAILED DESCRIPTION

[0022] Specific implementation method 1: Combination Figure 1 This implementation mode is explained by clearly and completely describing the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0023] It should be noted that the descriptions of the present invention regarding directions such as "left", "right", "left side", "right side", "upper", "lower", "top", "bottom", etc. are all defined based on the relationship between the orientations or positions shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the structure described must be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention. In the description of the present invention, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0024] In the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0025] A packer pressure simulation test system comprises a hydraulic cylinder 1, a casing 2, a plug 3 and a pressure test pump 4, wherein the fixed section of the hydraulic cylinder 1 is fixedly connected to one end of the casing 2, the movable end of the hydraulic cylinder 1 is located inside the casing 2, the packer 5 is coaxially inserted in the casing 2, and the movable end of the hydraulic cylinder 1 is sealed and inserted into one end of the packer center pipe 5-1, and a tension sensor 6 is arranged between the inner wall of one end of the casing 2 and the movable end of the hydraulic cylinder 1.

[0026] The plug 3 is sealed and fixed on the other end of the casing 2. A pressure joint 7 is connected and fixed on the plug 3, and one end of the pressure joint 7 is connected to the other end of the center pipe 5-1 of the packer. There are three pressure test pumps 4, which are respectively connected to the other end of the pressure joint 7, the side wall of the casing 2 corresponding to the upper annulus 5-2 of the packer, and the side wall of the casing 2 corresponding to the lower annulus 5-3 of the packer through pipelines.

[0027] The other end structure of the packer center pipe 5-1 is an upper joint, which is connected to the pressure joint 7 to achieve pressurization of the interior of the packer center pipe 5-1.

[0028] The packer 5-4 outside the packer center pipe 5-1 is a rubber tube, which is a part of the packer 5 structure and is a prior art, and will not be described here. The casing 2 simulates the wellbore, and the pressure test pump 4 presses into the packer 5 through the pressure joint 7, so that the packer 5-4 on the packer center pipe 5-1 expands and tightly adheres to the inner wall of the casing 2. The upper end of the packer 5-4 is the upper annulus 5-2, and the lower end is the lower annulus 5-3.

[0029] The hydraulic cylinder 1 and the sleeve 2 as well as the tension sensor 6 and the sleeve 2 are all detachably connected.

[0030] The hydraulic cylinder 1 is connected to the hydraulic station 8 via an oil pipe.

[0031] The method for testing the gas sealing performance of the packer 5 by using the packer pressure simulation test system of the utility model is as follows:

[0032] The packer 5 to be tested is installed in the casing 2, and the other end of the packer center pipe 5-1 is connected to the pressure joint 7. Through a pressure test pump 4, the packer center pipe 5-1 is pressurized by injecting liquid to achieve the setting of the packer 5. The specific setting principle of the packer 5 is the existing technology and will not be repeated here.

[0033] The upper annulus 5 - 2 or the lower annulus 5 - 3 of the packer is pressurized by the other two pressure test pumps 4 , so that the backwash well passage of the packer 5 is opened, simulating the backwash well working state of the downhole packer 5 .

[0034] When the packer 5 needs to be unsealed, the movable end of the hydraulic cylinder 1 extends and pushes forward the packer center pipe 5-1, and the friction between the packer 5-4 and the casing 2 is used to make the packer center pipe 5-1 move upward, thereby pulling off the unsealing pin, so that the packer 5 is unsealed. The magnitude of the unsealing force can be read by the tension sensor 6. The unsealing pin is a part of the structure of the packer 5, which is a prior art and will not be described here.

[0035] The packer pressure resistance simulation test system described in the utility model can simulate the downhole working conditions under ground conditions and perform factory inspection on the packer 5. It has a simple structure and strong practicality. Compared with the existing factory inspection of the packer 5 through downhole experiments, it greatly saves manpower, financial resources, material resources and time.

[0036] The packer pressure simulation test system described in the utility model is suitable for the performance inspection of K series, Y series, Z series or combined packers in SY / T5106-2019, "Specifications for Packers for Petroleum and Natural Gas Drilling and Production Equipment".

[0037] The fixed section of the hydraulic cylinder 1 is covered with a first flange 9, and one end of the casing 2 is covered with a second flange 10. The first flange 9 and the second flange 10 are butted and fixedly connected by a plurality of bolts 11. In this design, the hydraulic cylinder 1 and the casing 2 are fixedly connected by the first flange 9, the second flange 10 and the plurality of bolts 11, which facilitates the disassembly and installation between the hydraulic cylinder 1 and the casing 2, and further facilitates the installation and separation between the packer 5 and the casing 2.

[0038] The side wall of the casing 2 corresponding to the upper annulus 5-2 of the packer 5 is connected and fixedly installed with a first pressure test pipe 12, and the side wall of the casing 2 corresponding to the lower annulus 5-3 of the packer 5 is connected and fixedly installed with a second pressure test pipe 13. The two pressure test pumps 4 are connected to the first pressure test pipe 12 and the second pressure test pipe 13 through pipelines, and each pressure test pipe is connected and provided with a pressure gauge 14. In this design, the pressure gauge 14 is preferably a liquid pressure gauge 14, and the pressure difference between the upper annulus 5-2 and the lower annulus 5-3 of the packer can be checked in real time through the pressure gauge 14. The first pressure test pipe 12 and its corresponding pressure test pump 4 are connected through a first connecting pipe, and the second pressure test pipe 13 and its corresponding pressure test pump 4 are connected through a second connecting pipe, and the first pressure test pipe 12 and the first connecting pipe, as well as the second pressure test pipe 13 and the second connecting pipe are connected through a quick connector 15, which is convenient for disassembly and assembly.

[0039] Both pressure test pipes are provided with high pressure valves 16. Such a design is used to control the pressure on and off of the upper annulus 5-2 and the lower annulus 5-3 of the packer.

[0040] The first pressure test tube 12 and the second pressure test tube 13 are both three-way tubes.

[0041] The outer wall of one end of the casing 2 is threadedly connected to the inner wall of the second flange 10. Such a design facilitates the installation and removal of the second flange 10 and the casing 2. One end of the casing 2 is a tapered structure, and the inner wall of the second flange 10 is a gradually expanding structure, so that different lengths and types of packers can be tested.

[0042] The outer wall of the other end of the casing 2 is threadedly connected to the inner wall of the plug 3. Such a design facilitates the installation and removal of the second flange 10 and the casing 2. The other end of the casing 2 is a gradually contracting structure, and the inner wall of the plug 3 is a gradually expanding structure, so that different lengths and types of packers can be tested.

[0043] A bracket 17 is provided below the hydraulic cylinder 1, and a plurality of legs 18 are arranged below the sleeve 2. With such a design, the bracket 17 supports and fixes the hydraulic cylinder 1, and supports and fixes the sleeve 2 through the plurality of legs 18.

[0044] A plurality of universal wheels 19 are arranged at the bottom of the bracket 17, and a plurality of legs 18 are evenly distributed along the length direction of the casing 2. In such a design, the universal wheels 19 are self-locking universal wheels, which facilitates the movement and fixation of the position of the test system.

[0045] The hydraulic cylinder 1 is a double-section hydraulic cylinder.

[0046] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A packer pressure simulation test system, Features: The invention comprises a hydraulic cylinder (1), a casing (2), a plug (3) and a pressure test pump (4), wherein a fixed section of the hydraulic cylinder (1) is fixedly connected to one end of the casing (2), a movable end of the hydraulic cylinder (1) is located inside the casing (2), a packer (5) is coaxially inserted in the casing (2), and the movable end of the hydraulic cylinder (1) is seal-inserted into one end of a center pipe (5-1) of the packer, and a tension sensor (6) is arranged between the inner wall of one end of the casing (2) and the movable end of the hydraulic cylinder (1). The plug (3) is sealed and fixedly mounted on the other end of the casing (2); a pressure joint (7) is connected and fixedly mounted on the plug (3); one end of the pressure joint (7) is connected and arranged with the other end of the center pipe (5-1) of the packer; there are three pressure test pumps (4), which are respectively connected to the other end of the pressure joint (7), the side wall of the casing (2) corresponding to the upper annulus (5-2) of the packer, and the side wall of the casing (2) corresponding to the lower annulus (5-3) of the packer through pipelines.

2. A packer pressure simulation test system according to claim 1, Features: The fixed section of the hydraulic cylinder (1) is sleeved with a first flange (9), one end of the sleeve (2) is sleeved with a second flange (10), and the first flange (9) and the second flange (10) are butt-jointed and fixedly connected by a plurality of bolts (11).

3. A packer pressure simulation test system according to claim 1 or 2, Features: A first pressure test pipe (12) is connected and fixedly installed on the side wall of the casing (2) corresponding to the upper annulus (5-2) of the packer (5), and a second pressure test pipe (13) is connected and fixedly installed on the side wall of the casing (2) corresponding to the lower annulus (5-3) of the packer. Two pressure test pumps (4) are connected to the first pressure test pipe (12) and the second pressure test pipe (13) through pipelines respectively, and each pressure test pipe is connected and provided with a pressure gauge (14).

4. A packer pressure simulation test system according to claim 3, Features: Both pressure test pipes are provided with high pressure valves (16).

5. A packer pressure simulation test system according to claim 3, Features: The first pressure test tube (12) and the second pressure test tube (13) are both three-way tubes.

6. A packer pressure simulation test system according to claim 2, Features: The outer wall of one end of the sleeve (2) is threadedly connected to the inner wall of the second flange (10).

7. A packer pressure simulation test system according to claim 1, Features: The outer wall of the other end of the sleeve (2) is threadedly connected to the inner wall of the plug (3).

8. A packer pressure simulation test system according to claim 1, Features: A bracket (17) is arranged below the hydraulic cylinder (1), and a plurality of supporting legs (18) are arranged below the sleeve (2).

9. A packer pressure simulation test system according to claim 8, Features: A plurality of universal wheels (19) are arranged at the bottom of the bracket (17), and a plurality of supporting legs (18) are evenly distributed along the length direction of the sleeve (2).

10. A packer pressure simulation test system according to claim 1, Features: The hydraulic cylinder (1) is a double-section hydraulic cylinder.

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