A self-expanding packer testing tool

Abstract

The utility model relates to the technical field of self-expanding packer, especially to a self-expanding packer test tool, including bottom plate, liquid storage tank, liquid feeding pipe, support plate, shell and test cabin, the bottom plate is fixedly connected with liquid storage tank, two liquid feeding pipes are connected to the liquid storage tank, the support plate is fixedly connected to the liquid storage tank, the shell is fixedly connected to the support plate, the test cabin is fixedly connected in the shell. By starting two pipeline pumps, two pipeline pumps draw these two kinds of test liquid respectively, and input test cabin through the pipe, then start electric heating tube, electric heating tube heats test liquid, to simulate formation temperature, air pump is connected with test cabin top through gas guide pipe, injects gas to the cavity of test cabin, to simulate and control the wellbore pressure that self-expanding packer bears, pressure gauge and thermometer real -time monitoring the working condition in test cabin, to avoid appearing temperature and pressure simulation insufficient etc.

Description

Technical Field

[0001] This utility model relates to the field of self-expanding packers technology, and in particular to a testing fixture for self-expanding packers. Background Technology

[0002] A self-expanding packer is a downhole tool that automatically achieves a seal by utilizing the swelling of an elastomer element in a specific downhole fluid.

[0003] The current testing process for self-expanding packers mainly includes pressure tests and expansion sealing tests. Equipment such as test benches, pressure pumps, and heating systems are used to ensure the test medium is sufficient and free of impurities. The packer is placed in the center of the bench and fixed, and the test medium is injected until it is full. It is then heated to the rated operating temperature, with continuous liquid replenishment during the process to prevent gas residue. The pressure is slowly increased to the rated operating differential pressure, and the pressure drop is recorded. After stabilizing the pressure, a pressure reversal test is performed to confirm the stability of the sealing performance. However, existing technology still has some shortcomings. Due to the difficulty in achieving precise temperature control with the overall heating method, temperature fluctuations are large, leading to significant deviations between the expansion rate and final expansion amount of the packer's expansion material and the actual downhole conditions, affecting the accuracy of the test results. Furthermore, it is difficult to maintain a stable test pressure during pressure loading, which can easily lead to leakage.

[0004] Therefore, there is a need to provide a test fixture for self-expanding packers that can monitor temperature and pressure in real time. Utility Model Content

[0005] To overcome the shortcomings of existing technologies, such as the difficulty in achieving precise temperature control due to overall heating methods, large temperature fluctuations leading to significant deviations in the expansion rate and final expansion amount of the packer expansion material from actual downhole conditions, thus affecting the accuracy of test results, and the difficulty in maintaining stable test pressure during pressure loading, which can easily result in leakage, this invention provides a self-expanding packer testing fixture for real-time monitoring of temperature and pressure.

[0006] To address the aforementioned issues, this utility model employs the following technical solution: a self-expanding packer testing fixture, comprising a base plate, a liquid storage tank, a liquid filling pipe, a support plate, a shell, a test chamber, an upper end cover, a lower end cover, and fixing bolts. The liquid storage tank is fixedly connected to the base plate, and two liquid filling pipes are connected to the liquid storage tank. The support plate is fixedly connected to the liquid storage tank, and the shell is fixedly connected to the support plate. The test chamber is fixedly connected inside the shell, and an upper end cover and a lower end cover are provided on the test chamber. Both the upper and lower end covers are threadedly connected to the test chamber by multiple fixing bolts. The fixture also includes an electric heating tube, a self-expanding packer, a partition, a conduit, a pipeline pump, a pressure gauge, and a thermometer. The electric heating tube is installed inside the shell, the self-expanding packer is placed inside the test chamber, a partition is fixedly connected inside the liquid storage tank, two conduits connect the liquid storage tank and the test chamber, a pipeline pump is installed on the conduits, a pressure gauge is installed on the upper end cover, and a thermometer is installed on the upper end cover.

[0007] As an improvement to the above solution, it also includes guide rods, positioning blocks, and elastic elements. Four sets of guide rods are fixedly connected inside the test chamber. Positioning blocks are slidably arranged between a set of guide rods. Elastic elements are sleeved on the guide rods, and the two ends of the elastic elements are connected to the positioning blocks and the test chamber, respectively.

[0008] As an improvement to the above solution, it also includes an air pump and air guide pipes. The air pump is installed on the support plate, and two air guide pipes are connected between the air pump and the upper end cover.

[0009] As an improvement to the above solution, it also includes a liquid outlet pipe and a ball valve. The liquid outlet pipe is connected to the lower end cover and a ball valve is installed on the liquid outlet pipe.

[0010] As an improvement to the above solution, four waist-shaped holes are opened on the base plate.

[0011] As an improvement to the above solution, a sealing cap is also included, with the liquid addition tube covered by a sealing cap.

[0012] Compared with the prior art, the present invention has the following technical effects: 1. By starting two pipeline pumps, the two pipeline pumps respectively draw two test liquids and input them into the test chamber through conduits. Then, the electric heating tube is started to heat the test liquid to simulate the formation temperature. The air pump is connected to the top of the test chamber through the air pipe to inject gas into the cavity of the test chamber to simulate and control the wellbore pressure borne by the self-expanding packer. The pressure gauge and thermometer monitor the working conditions inside the test chamber in real time to avoid problems such as insufficient temperature and pressure simulation.

[0013] 2. When the self-expanding packer begins to expand, it will push the positioning block outward. The positioning block will then compress the elastic element and move along the guide rod, thus buffering the expansion of the self-expanding packer and avoiding rigid impact. Attached Figure Description

[0014] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0015] Figure 2 This is a three-dimensional cross-sectional view of the outer shell, test chamber, and self-expanding packer of this utility model.

[0016] Figure 3 This is a three-dimensional cross-sectional view of the outer shell, upper cover, and electric heating tube of this utility model.

[0017] Figure 4 This is a three-dimensional cross-sectional view of the liquid storage tank, outer shell, and conduit of this utility model.

[0018] Figure 5 This is a three-dimensional cross-sectional view of the test chamber, self-expanding packer, and thermometer of this utility model.

[0019] Figure 6 This is a three-dimensional sectional view of the self-expanding packer, guide rod, and positioning block of this utility model.

[0020] In the attached diagram, the following are the reference numerals: 1-base plate, 2-liquid storage tank, 201-liquid filling pipe, 3-support plate, 4-outer shell, 5-test chamber, 6-upper end cover, 7-lower end cover, 8-fixing bolt, 9-electric heating tube, 10-self-expanding packer, 11-partition plate, 12-conduit, 13-pipeline pump, 14-pressure gauge, 15-thermometer, 16-air pump, 17-air duct, 18-guide rod, 19-positioning block, 20-elastic element, 21-waist-shaped hole, 22-sealing cover, 23-liquid outlet pipe, 24-ball valve. Detailed Implementation

[0021] The present invention will now be described in detail with reference to the accompanying drawings.

[0022] Example 1: A test fixture for a self-expanding packer, see reference. Figures 1-6As shown, the device includes a base plate 1, a liquid storage tank 2, a liquid filling pipe 201, a support plate 3, an outer shell 4, a test chamber 5, an upper end cover 6, a lower end cover 7, and fixing bolts 8. The liquid storage tank 2 is welded to the top of the base plate 1. The liquid filling pipes 201 are symmetrically connected to the top of the liquid storage tank 2. The support plate 3 is welded to the left side of the top of the liquid storage tank 2. The outer shell 4 is fixedly connected to the support plate 3. The test chamber 5 is fixedly connected inside the outer shell 4. The upper end cover 6 is installed on the top of the test chamber 5, and the lower end cover 7 is installed on the bottom of the test chamber 5. Both the upper end cover 6 and the lower end cover 7 are threadedly connected to the test chamber 5 with multiple fixing bolts. The plug 8 also includes an electric heating tube 9, a self-expanding packer 10, a partition 11, a conduit 12, a pipeline pump 13, a pressure gauge 14, and a thermometer 15. The electric heating tube 9 is installed inside the outer shell 4, and the self-expanding packer 10 is placed inside the test chamber 5. A partition 11 is fixedly connected to the middle of the liquid storage tank 2, and the partition 11 divides the space inside the liquid storage tank 2 into two chambers. Two conduits 12 are connected between the liquid storage tank 2 and the test chamber 5, and the two conduits 12 are connected to the two chambers respectively. A pipeline pump 13 is installed on the conduit 12. A pressure gauge 14 is installed on the left side of the upper end cover 6, and a thermometer 15 is installed on the right side of the upper end cover 6.

[0023] See Figure 1 and Figure 3 As shown, it also includes an air pump 16 and an air guide pipe 17. The air pump 16 is installed on the upper left side of the support plate 3 by means of bolt connection, and two air guide pipes 17 are connected between the air pump 16 and the upper end cover 6.

[0024] See Figure 1 As shown, the bottom plate 1 has symmetrical waist-shaped holes 21 on both the left and right sides.

[0025] See Figure 1 As shown, it also includes a sealing cap 22, which covers the liquid adding tube 201.

[0026] When testing is to be conducted, first fix the base plate 1 in a suitable position using the fixing bolts 8. During fixing, the fixing bolts can be adjusted within a certain horizontal or vertical range through the oblong hole 21, allowing the entire fixture to flexibly adapt to the position of different installation foundations. Then, the self-expanding packer 10 is placed inside the test chamber 5, and the upper end cover 6 is placed on the test chamber 5 and fixed to the test chamber 5 using the fixing bolts 8. Subsequently, the liquid storage tank 2 is divided into two independent chambers by the partition 11, and two different test liquids are added to each chamber through the liquid addition pipe 201. After the addition is completed, the sealing cap 22 is placed on the liquid addition pipe 201 to prevent impurities from entering the liquid storage tank 2. During testing, two pipeline pumps 13 are started to draw the two test liquids respectively and introduce them into the test chamber 5 through the conduit 12. Then, the electric heating tube 9 is started to heat the test liquid to simulate the formation temperature. The air pump 16 is connected to the top of the test chamber 5 through the air guide pipe 17 to inject gas into the cavity of the test chamber 5 to simulate and control the wellbore pressure borne by the self-expanding packer 10. The pressure gauge 14 and the thermometer 15 monitor the working conditions inside the test chamber 5 in real time to avoid problems such as insufficient temperature and pressure simulation. The self-expanding packer 10 is in contact with the high temperature and high pressure liquid in the test chamber 5 to test its expansion sealing performance, temperature resistance and durability.

[0027] Example 2: Based on Example 1, refer to Figure 5 and Figure 6 As shown, it also includes guide rods 18, positioning blocks 19 and elastic elements 20. Four sets of guide rods 18 are fixedly connected at even intervals in the lower part of the test chamber 5. Two guide rods 18 form a group. Positioning blocks 19 are slidably arranged between a group of guide rods 18. The four positioning blocks 19 support the self-expanding packer 10. Elastic elements 20 are sleeved on the guide rods 18. The two ends of the elastic elements 20 are connected to the positioning blocks 19 and the test chamber 5, respectively.

[0028] When the self-expanding packer 10 is placed in the test chamber 5, the four sets of positioning blocks 19, supported by the elastic element 20, provide a support platform for the self-expanding packer 10. When the self-expanding packer 10 begins to expand, it will squeeze the positioning blocks 19 outward. The positioning blocks 19 will then compress the elastic element 20 and move along the guide rod 18, so as to buffer the expansion of the self-expanding packer 10 and avoid rigid impact.

[0029] See Figure 3 As shown, it also includes a liquid outlet pipe 23 and a ball valve 24. The liquid outlet pipe 23 is connected to the lower end cover 7, and the ball valve 24 is installed on the liquid outlet pipe 23.

[0030] After the test is completed, turn off all electronic equipment and then open ball valve 24 to allow the liquid in test chamber 5 to be discharged through outlet pipe 23.

[0031] Although the present invention has been described in detail with reference to the above embodiments, it will be apparent to those skilled in the art that various changes or modifications can be made to the present invention without departing from the principles and spirit of the present invention as defined by the claims. Therefore, the detailed description of the embodiments in this disclosure is for explanation only and not for limiting the present invention, but rather the scope of protection is defined by the content of the claims.

Claims

1. A self-expanding packer testing fixture, comprising a base plate (1), a liquid storage tank (2), a liquid filling pipe (201), a support plate (3), a shell (4), a test chamber (5), an upper end cover (6), a lower end cover (7), and fixing bolts (8), wherein the liquid storage tank (2) is fixedly connected to the base plate (1), two liquid filling pipes (201) are connected to the liquid storage tank (2), the support plate (3) is fixedly connected to the liquid storage tank (2), the shell (4) is fixedly connected to the support plate (3), the test chamber (5) is fixedly connected inside the shell (4), the upper end cover (6) is provided on the test chamber (5), the lower end cover (7) is provided on the test chamber (5), and both the upper end cover (6) and the lower end cover (7) are threadedly connected to the test chamber (5) by multiple fixing bolts (8), characterized in that: It also includes an electric heating tube (9), a self-expanding packer (10), a partition (11), a conduit (12), a pipeline pump (13), a pressure gauge (14), and a thermometer (15). The electric heating tube (9) is installed inside the outer shell (4), the self-expanding packer (10) is placed inside the test chamber (5), the partition (11) is fixedly connected inside the liquid storage tank (2), and two conduits (12) are connected between the liquid storage tank (2) and the test chamber (5). A pipeline pump (13) is installed on the conduit (12), a pressure gauge (14) is installed on the upper end cover (6), and a thermometer (15) is installed on the upper end cover (6).

2. The self-expanding packer testing fixture as described in claim 1, characterized in that: It also includes guide rods (18), positioning blocks (19) and elastic elements (20). Four sets of guide rods (18) are fixedly connected inside the test chamber (5). Positioning blocks (19) are slidably arranged between a set of guide rods (18). Elastic elements (20) are sleeved on the guide rods (18). The two ends of the elastic elements (20) are connected to the positioning blocks (19) and the test chamber (5) respectively.

3. A self-inflating packer testing tool as defined in claim 2, wherein: It also includes an air pump (16) and an air guide pipe (17). The air pump (16) is installed on the support plate (3), and two air guide pipes (17) are connected between the air pump (16) and the upper end cover (6).

4. The self-expanding packer testing fixture as described in claim 3, characterized in that: It also includes a liquid outlet pipe (23) and a ball valve (24). The liquid outlet pipe (23) is connected to the lower end cap (7), and the ball valve (24) is installed on the liquid outlet pipe (23).

5. A self-inflating packer testing tool as defined in claim 4, wherein: The base plate (1) has four waist-shaped holes (21).

6. The self-expanding packer testing fixture as described in claim 5, characterized in that: It also includes a sealing cap (22), and the liquid adding tube (201) is covered with a sealing cap (22).

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