High-temperature and high-pressure testing device and testing method for packer

Abstract

The invention relates to a high-temperature and high-pressure testing device and method for a packer, and belongs to the technical field of petroleum engineering. The temperature in the test shaft is controlled through the electric heating belt, the upper connector is sleeved at the A end of the test shaft, the connector is in threaded connection with the upper connector, the first screwed plug is sleeved on the connector in a buckling mode, the second screwed plug is sleeved at the B end of the test shaft, and the first meter bushing and the second meter bushing are respectively installed on the upper side faces of the upper connector and the second screwed plug. The first high-temperature pressure gauge and the second high-temperature pressure gauge are used for measuring the pressure at the two ends of the test shaft respectively, and a first steel pipe and a second steel pipe are installed on the lower side faces of the upper connector and the second screwed plug respectively. And the ferrule type three-way pipe joint is provided with a proportional unloading valve and a high-temperature and high-pressure needle valve. According to the invention, underground high-temperature and high-pressure environments can be simulated, and the sealing effect of the packer is detected by respectively controlling the pressures on the two sides of the packer.

Description

Technical Field

[0001] This invention relates to a high-temperature and high-pressure testing device and method for packers, belonging to the field of petroleum engineering technology. Background Technology

[0002] Packers play a crucial role in oil extraction by isolating producing formations and separating water injection zones. Their sealing performance is critical to the packer's overall performance. During oilfield production, downhole packers are frequently affected by external environmental factors such as downhole temperature, pressure, gas-liquid media, and formation structure, resulting in varying sealing performance. Therefore, before running them into the well, downhole environmental simulation tests are necessary to effectively assess their quality and provide a basis for subsequent research and development.

[0003] Currently, packer sealing test equipment is inadequate: existing test equipment has a simple structure, mainly consisting of a single simulated wellbore and a heating system directly fitted onto the outside of the simulated wellbore. During the test, the packer is first placed in a simulated wellbore filled with a mixed liquid. The heating system heats the simulated wellbore, thereby heating the mixed liquid inside, simulating the downhole environment for packer quality testing. However, existing test equipment only has a heating system and cannot simulate the simultaneous high temperature and high pressure environment present downhole; it also only measures the pressure on one side of the packer under sealed conditions, and cannot simultaneously measure the pressure on both sides of the packer. Summary of the Invention

[0004] To address the technical problems existing in the prior art, this invention provides a high-temperature and high-pressure testing device and method for packers, which allows packers to undergo simulated testing in a more realistic downhole environment. Under high temperature and high pressure conditions, the sealing effect of the packer is tested by controlling the pressure on both sides of the packer separately, thereby improving the sealing reliability of downhole packers. The pre-testing through simulation effectively reduces the accident rate of packers in the well.

[0005] The technical solution adopted in this invention is a high-temperature and high-pressure testing device for packers, including an upper connector, a connecting body, a first plug, a second plug, an electric heating belt, an insulation sleeve, and a test well for mounting the packer. The electric heating belt is wrapped around the outer wall of the test well, and the insulation sleeve is fitted over the electric heating belt. The upper connector is fitted over end A of the test well. The connecting body is detachably connected to the other end of the upper connector. The first plug is fitted onto the connecting body, and the second plug is fitted over end B of the test well. The first gauge insert and the second gauge insert are respectively installed on the end faces of the upper connector and the second plug. The first high-temperature pressure gauge and the second high-temperature pressure gauge are respectively used to measure the pressure at both ends of the test well. A first steel pipe and a second steel pipe are respectively installed on the lower end faces of the upper connector and the second plug. The other ends of the first steel pipe and the second steel pipe are also respectively fitted with compression fitting tee fittings. The compression fitting tee fittings are connected to a proportional unloading valve and a high-temperature and high-pressure needle valve.

[0006] Furthermore, the upper connector is connected to the first steel pipe via a male threaded ferrule connector, and the second plug is connected to the second steel pipe via a male threaded ferrule connector.

[0007] Furthermore, the connector is threaded to the other end of the upper connector.

[0008] Furthermore, the first plug is threadedly connected to the connecting body, and the second plug is threadedly connected to the test wellbore.

[0009] Furthermore, the first high-temperature pressure gauge is installed on the first gauge filler core, and the second high-temperature pressure gauge is installed on the second gauge filler core.

[0010] This invention also discloses a test method using this test apparatus. First, the packer is placed inside the test wellbore. A heating medium is injected into the annulus between the test wellbore and the packer via a hydraulic pump connected to a high-temperature, high-pressure needle valve. Second, the setting method of the packer is determined. After setting, the first plug is connected to the connector. Then, the test apparatus is heated by an electric heating belt. When the temperature reaches the required test temperature, the internal pressure of the test apparatus increases according to the ideal gas law. When the maximum pressure of the proportional unloading valve is reached, the test apparatus automatically depressurizes to maintain the set pressure. At this time, the test apparatus measures the packer.

[0011] Furthermore, if the packer is set by hydraulic setting, the packer is set by pressurizing the pressure fitting connected to the connector, and the pressure fitting is removed after setting; if the packer is set by thermal setting or water-sensitive setting, the first plug is directly connected to the connector.

[0012] Furthermore, during the testing of the packer, the pressure difference is adjusted by controlling the high-temperature and high-pressure needle valves at both ends of the test wellbore; the temperature is controlled by controlling the heating temperature of the electric heating belt; and the pressure changes are observed by the first high-temperature pressure gauge and the second high-temperature pressure gauge during the process.

[0013] This invention discloses a high-temperature and high-pressure testing device and method for packers. Its beneficial effect is that, compared with the prior art, this invention can simulate the high-temperature and high-pressure environment downhole. By controlling the pressure on both sides of the packer separately, the sealing effect of the packer can be tested, thereby improving the sealing reliability of downhole packers. The pre-testing through simulation tests effectively reduces the accident rate of packers downhole. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 The diagram shown is a schematic of embodiment 1, in which the packer is placed inside the test wellbore.

[0016] As shown in the figure:

[0017] 1. First plug; 2. Connector; 3. First high-temperature pressure gauge; 4. Proportional unloading valve; 5. First steel pipe; 6. High-temperature and high-pressure needle valve; 7. Upper connector; 8. Test well shaft; 9. Insulation sleeve; 10. Electric heating belt; 11. Packer; 12. Second plug; 13. First gauge filler core; 14. Male threaded ferrule connector; 15. Flanged tee pipe connector; 16. Second gauge filler core; 17. Second high-temperature pressure gauge; 18. Second steel pipe. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] To further understand the invention, the technical solution will be further described below in conjunction with specific embodiments.

[0020] Example 1:

[0021] like Figure 1As shown, this embodiment provides a high-temperature and high-pressure testing device for a packer, including an upper connector 7, a connecting body 2, a first plug 1, a second plug 12, an electric heating belt 10, an insulation sleeve 9, and a test wellbore 8 for mounting a packer 11. The electric heating belt 10 is wrapped around the outer wall of the test wellbore 8, and the insulation sleeve 9 is fitted over the outside of the electric heating belt 10. The upper connector 7 is fitted onto end A of the test wellbore 8, and the connecting body 2 is threadedly connected to the other end of the upper connector 7. The first plug 1 is fitted onto the connecting body 2 and threadedly connected, and the second plug 12 is fitted onto end B of the test wellbore 8 and threadedly connected. The first gauge insert 13 and the second gauge insert 16 are respectively installed on the upper connector. On the end faces of the head 7 and the second plug 12, i.e., the top sidewall, the first high-temperature pressure gauge 3 is installed on the first gauge insert 13, and the second high-temperature pressure gauge 17 is installed on the second gauge insert 16. The first high-temperature pressure gauge 3 and the second high-temperature pressure gauge 17 are used to measure the pressure at both ends of the test well 8, respectively. The lower end faces of the upper connector 7 and the second plug 12 are connected to the first steel pipe 5 and the second steel pipe 18 through male threaded ferrule connectors 14, respectively. The other ends of the first steel pipe 5 and the second steel pipe 18 are also equipped with ferrule-type tee connectors 15, which are connected to the proportional unloading valve 4 and the high-temperature high-pressure needle valve 6. The first steel pipe 5 and the second steel pipe 18 are made of seamless steel pipes. The pressure difference within the set pressure of the proportional unloading valve 4 can be detected, and the pressure will automatically release if it exceeds the set pressure to ensure test safety.

[0022] During the sealing test of packer 11, the components are first assembled and pressure tested. Specifically, the lower end of packer 11 is threaded to the upper connector 7, the test wellbore 8 is fastened to the outside of packer 11 and its A end is threaded to the upper connector 7, and its B end is threaded to the second plug 12. Then, the connecting body 2 is threaded to the other end of the upper connector 7. Next, the first high-temperature pressure gauge 3 and the first gauge insert 13 are connected to the upper connector 7, and the second high-temperature pressure gauge 17 and the second gauge insert 16 are respectively connected to the second plug 12. Two sets of seamless steel pipes, the proportional unloading valve 4, the high-temperature and high-pressure needle valve 6, the male threaded ferrule connector 14, and the ferrule-type tee connector 15 are respectively connected to the lower side (bottom side) of the upper connector 7 and the second plug 12. Finally, the electric heating belt 10 is placed on the outside of the test wellbore 8, followed by the insulation sleeve 9, and the electric heating belt 10 is connected to the PLC control box. Next, a hydraulic pump is connected to a high-temperature, high-pressure needle valve 6 to inject heating medium into the annular space between the test wellbore 8 and the packer 11, and pressurize it to the test pressure of 1.5 MPa to verify the overall sealing condition of the device. Under unheated conditions, pressure is injected into the high-temperature, high-pressure needle valve 6 to test the pressure-bearing capacity at both ends of the packer 11. The high-temperature, high-pressure needle valve 6 located at end A of the test wellbore 8 measures the upper pressure of the packer 11, and the high-temperature, high-pressure needle valve 6 located at end B of the test wellbore 8 measures the lower pressure of the packer 11. Thus, this testing device also has the function of detecting the pressure-bearing capacity of the packer 11 at room temperature, completing the pre-test preparation work. This device can also measure the unilateral pressure-bearing capacity of the packer 11 under room temperature conditions without heating.

[0023] This embodiment also discloses a method for high-temperature and high-pressure testing of a packer. First, the packer 11 is placed inside the test wellbore 8. A heating medium is injected into the annulus between the test wellbore 8 and the packer 11 by connecting a hydraulic pump to a high-temperature and high-pressure needle valve 6. Next, the setting method of the packer 11 is determined. If the setting method of the packer 11 is hydraulic setting, the packer 11 is set by pressurizing the pressure fitting connected to the connector 2. After setting, the pressure fitting is removed. If the setting method of the packer 11 is thermal setting or water-sensitive setting, the first plug 1 is directly connected to the connector 2. After the sealing is completed, the first plug 1 is connected to the connector 2; the electric heating belt 10 is turned on to heat the test device. When the temperature reaches the required temperature, the internal pressure of the test device increases according to the ideal gas law. When the maximum pressure of the proportional unloading valve 4 is reached, the test device automatically depressurizes to maintain the set pressure. At this time, the test device can maintain a high temperature and high pressure state to measure the packer 11. During the measurement of the packer 11 by the test device, the temperature is controlled by controlling the heating temperature of the electric heating belt 10. The upper and lower pressures at both ends of the packer 11 are adjusted by adjusting the high temperature and high pressure needle valves 6 at both ends of the test wellbore 8. By controlling the upper and lower pressures, the pressure difference between the upper and lower pressures on the packer 11 is obtained. The pressure change is observed by the first high temperature pressure gauge 3 and the second high temperature pressure gauge 17 to verify the overall sealing effect. By controlling the electric heating temperature and the upper and lower pressures of the packer 11, tests under different formation conditions can be simulated.

[0024] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A high-temperature and high-pressure testing device for packers, characterized in that, The test well includes an upper connector (7), a connecting body (2), a first plug (1), a second plug (12), an electric heating belt (10), an insulation sleeve (9), and a test well (8) for mounting a packer (11). The electric heating belt (10) is wrapped around the outer wall of the test well (8), the insulation sleeve (9) is fitted over the electric heating belt (10), the upper connector (7) is fitted over end A of the test well (8), the connecting body (2) is detachably connected to the other end of the upper connector (7), the first plug (1) is fastened onto the connecting body (2), the second plug (12) is fitted over end B of the test well (8), and the first gauge plug... The first high-temperature pressure gauge (3) and the second high-temperature pressure gauge (17) are respectively installed on the end faces of the upper connector (7) and the second plug (12). The first high-temperature pressure gauge (3) and the second high-temperature pressure gauge (17) are respectively used to measure the pressure at both ends of the test well (8). The first steel pipe (5) and the second steel pipe (18) are respectively installed on the lower side of the upper connector (7) and the second plug (12). The other end of the first steel pipe (5) and the second steel pipe (18) are respectively installed with a compression fitting tee pipe joint (15). The compression fitting tee pipe joint (15) is connected to the proportional unloading valve (4) and the high-temperature high-pressure needle valve (6).

2. The packer high-temperature and high-pressure testing device according to claim 1, characterized in that, The upper connector (7) is connected to the first steel pipe (5) through a male threaded ferrule connector (14), and the second plug (12) is connected to the second steel pipe (18) through a male threaded ferrule connector (14).

3. The packer high-temperature and high-pressure testing device according to claim 1, characterized in that, The connector (2) is threaded to the other end of the upper connector (7).

4. A packer high-temperature and high-pressure testing device according to any one of claims 1 to 3, characterized in that, The first plug (1) is threaded to the connector (2), and the second plug (12) is threaded to the test well (8).

5. The packer high-temperature and high-pressure testing device according to claim 1, characterized in that, The first high-temperature pressure gauge (3) is installed on the first gauge core (13), and the second high-temperature pressure gauge (17) is installed on the second gauge core (16).

6. A method for high-temperature and high-pressure testing of packers, characterized in that, The packer high-temperature and high-pressure test device as described in claim 1 is used to first place the packer (11) inside the test wellbore (8), and inject the heating medium into the annulus between the test wellbore (8) and the packer (11) by connecting the hydraulic pump to the high-temperature and high-pressure needle valve (6); then determine the setting method of the packer (11), and after setting, connect the first plug (1) to the connector (2); then heat the test device by the electric heating belt (10), and when the temperature required for the test is reached, the internal pressure of the test device increases according to the ideal gas law. When the maximum pressure of the proportional unloading valve (4) is reached, the test device automatically depressurizes and maintains the set pressure; at this time, the test device measures the packer (11).

7. The method for high-temperature and high-pressure testing of a packer according to claim 6, characterized in that, If the setting method of the packer (11) is hydraulic setting, the packer (11) is set by pressing the pressure connector through the connector (2), and the pressure connector is removed after setting.

8. The method for high-temperature and high-pressure testing of a packer according to claim 6, characterized in that, If the setting method of the packer (11) is thermal setting or water setting, the first plug (1) is directly connected to the connector (2).

9. The method for high-temperature and high-pressure testing of a packer according to claim 6, characterized in that, During the test of the packer (11), the pressure difference is adjusted by controlling the high-temperature and high-pressure needle valves (6) at both ends of the test wellbore (8); the temperature is controlled by controlling the heating temperature of the electric heating belt (10), and the pressure change is observed by the first high-temperature pressure gauge (3) and the second high-temperature pressure gauge (17) during the process.

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