Wellhead simulation test device and test method for operation under pressure

Abstract

The invention discloses an under-pressure operation wellhead simulation test device and method, and the device comprises a simulation test frame, the simulation test frame comprises a test frame pedestal, the simulation test frame is used for fixing to-be-tested equipment, the test frame pedestal is fixedly connected with a simulation test assembly, and the simulation test assembly is disposed in the simulation test frame. And the simulation test assembly is used for carrying out simulation test on the to-be-tested equipment. The simulation test assembly can simulate a part of conditions encountered by a tubular column underground, so that simulation test can be carried out on the under-pressure operation equipment on the ground to obtain related parameters, parameters are provided for operation of the under-pressure operation equipment, the simulation test can be carried out on the ground, and the test does not need to be carried out by digging a well actually. The simulation test jig does not need to use a tubular column with an actual length to carry out simulation test.

Description

Technical Field

[0001] The present invention belongs to the field of pressure - operated work equipment, and particularly relates to a simulation test device and test method for a pressure - operated work wellhead. Background Technique

[0002] Pressure - operated work is a technology that relies on a pressure - operated work machine installed on the wellhead to control the wellhead pressure and the downhole string to achieve pressure - operated work at the wellhead. Although this technology has a higher risk than conventional well - killing operations, it has been widely promoted due to its advantages such as the best protection of oil and gas reservoirs, high - efficiency operation, and low cost. In recent years, pressure - operated work technology has become a relatively advanced operation method in oil and gas field exploration and development production.

[0003] Operating the key equipment for wellhead control of a pressure - operated work machine requires higher requirements for operators than operating equipment such as conventional drilling rigs and workover rigs. In current operations, due to the lack of some parameters of pressure - operated work equipment, such as control parameters and operating parameters, for example, the "suspended weight" and "upward force" of the pipe string. This can cause equipment damage, such as the damage of the surface passivation layer and anticorrosion layer of the work pipe string by the slip jaw plate during pressure - operated work; the failure of the front seal of the working ram preventer, the short service life of the sealing material, and low operating efficiency. And the data is obtained by drilling underground or using a pipe string of actual length, which not only has spatial limitations but also high costs. Summary of the Invention

[0004] The purpose of the present invention is to provide a simulation test device and test method for a pressure - operated work wellhead to solve the problems of equipment damage caused by the lack of some parameters of pressure - operated work equipment in current pressure - operated work and the problems of spatial limitations and high costs brought about by obtaining parameters through underground drilling or using a pipe string of actual length.

[0005] To solve the above - mentioned technical problems, the present invention provides a simulation test device for a pressure - operated work wellhead, including a simulation test frame. The simulation test frame includes a test frame base. The simulation test frame is used to fix the device to be tested. The test frame base is fixedly connected with a simulation test component. The simulation test component is arranged inside the simulation test frame and is used to perform a simulation test on the device to be tested. On the side of the simulation test frame opposite to the test frame base, there is an equipment connection component, and the equipment connection component is used to connect and fix the device to be tested.

[0006] Further, the simulation test component includes a simulation test oil cylinder. One closed end of the simulation test oil cylinder is fixedly connected with the test frame base, and the telescopic end of the simulation test oil cylinder is connected with a fixed base.

[0007] Further, a cylinder body pipeline is arranged on the cylinder body of the simulation test oil cylinder. One end of the cylinder body pipeline is connected to the simulation test oil cylinder, and the other end of the cylinder body pipeline is connected to an oil cylinder control component. The oil cylinder control component is used to control the telescopic movement of the simulation test oil cylinder.

[0008] Further, in the middle of the side of the fixed base away from the simulation test oil cylinder, a pipe string fixing part is provided, and the pipe string fixing part is used to fix the simulation test pipe string.

[0009] Further, a simulation test sensor is detachably connected to the side of the fixed base away from the simulation test oil cylinder. The simulation test sensor is used to provide some data during the simulation test, and the simulation test sensor is electrically connected to the control device, and the control device is used to obtain the data of the simulation test sensor.

[0010] Further, a sealing assembly is also connected to the side of the simulation test sensor away from the fixed base. The sealing assembly includes a first sealing part, and a sealing barrel is connected to the first sealing part. One end of the sealing barrel is connected to the first sealing part, and the other end of the sealing barrel is connected to the side of the simulation test frame away from the simulation test oil cylinder.

[0011] Further, a second sealing part is also provided in the inner cavity of the sealing barrel, and the second sealing part is connected to the first sealing part; a third sealing part is also provided in the inner cavity of the sealing barrel, and the third sealing part is connected to the second sealing part.

[0012] Further, an injection pipe is connected to the side wall of the sealing barrel. The injection pipe is used to inject liquid and / or gas into the inner cavity of the sealing barrel. The position where the injection pipe is connected to the side wall of the sealing barrel is located at a place in the sealing barrel where the sealing assembly is not connected. A pressure gauge and an injection valve are also connected to the injection pipe.

[0013] Further, a test method for a pressure operation wellhead simulation test device includes the following steps:

[0014] A. Pass the simulation test pipe string through the equipment connection assembly and the simulation test sensor and fixedly connect it to the fixed base.

[0015] B. When the device to be tested is a slip assembly, fixedly connect the slip assembly to the equipment connection assembly.

[0016] C. Adjust the upward pushing force and downward pulling force of the simulation test oil cylinder.

[0017] D. Adjust the clamping force of the slip assembly.

[0018] E. Obtain the telescopic data of the simulation test oil cylinder and / or the data of the simulation test sensor.

[0019] Further, a test method for a pressure operation wellhead simulation test device includes the following steps:

[0020] A. Pass the simulation test pipe string through the equipment connection assembly, the sealing barrel, the first sealing part, the second sealing part, the third sealing part and the simulation test sensor and fixedly connect it to the fixed base.

[0021] B. The device under test is the working ram, and the working ram is fixedly connected to the device connection assembly.

[0022] C. Inject liquid or gas into the sealing barrel through the injection valve.

[0023] D. Adjust the upward pushing force and downward pulling force of the simulation test cylinder.

[0024] E. Adjust the closing pressure of the working ram.

[0025] F. Obtain the data of liquid or gas at the ram valve and / or ram pressure gauge on the working ram, and obtain the telescopic data of the simulation test cylinder and / or the data of the simulation test sensor.

[0026] The beneficial effects of a simulation test device and test method for a pressure - operated wellhead provided by the present invention are as follows: Due to the design of the simulation test rack, a simulation test component is fixedly connected to the test rack base of the simulation test rack. This simulation test component can perform simulation tests on the device under test. The simulation test component can simulate some situations that the pipe string encounters underground, so that the simulation test of the pressure - operated equipment can be carried out on the ground to obtain relevant parameters, providing parameters for the operation of the pressure - operated equipment. Since the simulation test can be carried out on the ground, there is no need to actually drill a well for testing. The simulation test rack also does not need to use a pipe string of actual length for simulation testing. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of a simulation test device for a pressure - operated wellhead;

[0028] Figure 2 It is a schematic diagram of the combination of a simulation test device for a pressure - operated wellhead and a slip assembly;

[0029] Figure 3 It is a schematic diagram of the combination of a simulation test device for a pressure - operated wellhead and a working ram;

[0030] Figure 4 It is a cross - sectional schematic diagram of the combination of a sealing barrel, a sealing assembly and a simulation test sensor. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0031] In order to better understand the purpose, structure and function of the present invention, the following further describes in detail a simulation test device and test method for a pressure - operated wellhead of the present invention in conjunction with the attached Figures 1 to 4 , drawings.

[0032] As Figure 1As shown in the figure, a simulation test device and method for a wellhead under pressure operation in an embodiment of the present invention include a simulation test frame 100, and the simulation test frame 100 further includes a test frame base 110. The test frame base 110 is located at the bottom of the simulation test frame 100. The simulation test frame 100 is used to fix the device to be tested, and the device to be tested is fixed on the top of the simulation test frame 100. The test frame base 110 is fixedly connected with a simulation test component, and the simulation test component is arranged inside the simulation test frame 100. The simulation test component is used to perform simulation tests on the device to be tested. On one side of the simulation test frame 100 opposite to the test frame base 110, there is a device connection component 120, and the device connection component 120 is used to connect and fix the device to be tested.

[0033] In the present invention, the simulation test component includes a simulation test oil cylinder 210. One closed end of the simulation test oil cylinder 210 is fixedly connected with the test frame base 110, and one telescopic end of the simulation test oil cylinder 210 is connected with a fixed base 220. A cylinder body pipeline 211 is arranged on the cylinder body of the simulation test oil cylinder 210. One end of the cylinder body pipeline 211 is connected to the simulation test oil cylinder 210, and the other end of the cylinder body pipeline 211 is connected to an oil cylinder control component 500. The oil cylinder control component 500 is used to control the simulation test oil cylinder 210 to expand and contract. And an oil pipe can be installed in the cylinder body pipeline 211 for conveying the oil liquid required for the expansion and contraction of the simulation test oil cylinder 210. A communication pipeline can also be installed in the cylinder body pipeline 211 for monitoring the state of the simulation test oil cylinder.

[0034] On one side of the fixed base 220 away from the simulation test oil cylinder 210, a simulation test sensor 230 is detachably connected. The simulation test sensor 230 is used to provide some data during the simulation test. In the middle of one side of the fixed base 220 away from the simulation test oil cylinder 210, there is a pipe string fixing part, and the pipe string fixing part is used to fix the simulation test pipe string 400.

[0035] It can be understood that the simulation test sensor 230 is electrically connected to a control device 600, and the control device 600 is used to obtain the data of the simulation test sensor 230.

[0036] The length of the pipe string usually used in actual operations is generally between 9 meters and 10 meters, and the length is relatively long. The pipe string 400 used in this simulation test device for wellhead under pressure operation does not need to use the actual length, and the length of the pipe string 400 is reduced to about 1 meter. There is a hole at the top of the simulation test frame 100 for the pipe string to pass through. During the simulation test, first pass the pipe string 400 through the top of the simulation test frame 100 and extend it to the position of the simulation test sensor 230. For the sensor used in the simulation test device for wellhead under pressure operation, a sensor with a channel in the middle can be selected, or the sensor can be attached to the outer wall of the pipe string 400. After passing through the sensor, the pipe string 400 is detachably fixedly connected to the fixed base 220.

[0037] As Figure 2 shown, in some embodiments, a pressure-operated wellhead simulation test device is used to perform a simulation test on the slip assembly 700. The test steps are as follows:

[0038] A. Pass the simulation test string 400 through the equipment connection assembly 120 and the simulation test sensor 230 and fixedly connect it to the fixed base 220.

[0039] B. The device to be tested is the slip assembly 700. The slip assembly 700 is fixedly connected to the equipment connection assembly 120. When performing the simulation test, first hold the string 400 with the slip assembly 700.

[0040] C. Adjust the upward pushing force and downward pulling force of the simulation test cylinder 210. That is, control the telescoping of the simulation test cylinder 210 through the cylinder control assembly 500. So that the fixed base 220 can imitate some conditions in the well. For example, simulate the suspended weight of the actual downhole string by pulling the string 400 downward with the simulation test cylinder 210, and simulate the upward pushing force on the actual downhole string by pushing the string 400 upward with the simulation test cylinder 210.

[0041] D. Adjust the holding force of the slip assembly 700.

[0042] E. Obtain the telescoping data of the simulation test cylinder 210 and / or the data of the simulation test sensor 230. At the same time, obtain the sliding distance parameter of the string 400 through the simulation test sensor, so as to obtain the working pressure parameter and the holding degree parameter between the current slip assembly 700 and the string 400, etc.

[0043] When the simulation test cylinder 210 pushes upward, it can simulate the situation of the upward pushing force at the bottom of the well. When the simulation test cylinder 210 pulls downward, it can simulate the situation of the string suspended weight. Thus, collect the "suspended weight", "upward pushing force", and the working pressure of the slip actuator, and collect the movement (sliding) displacement data of the simulation test string 400 under different suspended weights or upward pushing forces, so as to provide a basis for studying the coupling relationship between slips of different materials and string materials.

[0044] Ensure that the simulation test string 400 is not damaged by the slip assembly 700, and measure the working pressure parameter and the holding degree parameter for the slip assembly 700 to open the slips under different closing working pressure parameters. Moreover, it can also measure the maximum holding load of the slip assembly 700 for different steel grade strings under the maximum closing working hydraulic force, so that the operator can calibrate the rated load of the slip assembly 700. Provide reliable parameter support for subsequent actual operations.

[0045] As Figure 3 and Figure 4As shown, in some other embodiments, a simulation test device for wellhead operation under pressure is used to conduct simulation tests on the working ram 800. A second sealing portion 250 is further provided in the inner cavity of the sealing barrel 270, and the second sealing portion 250 is connected to the first sealing portion 240. The second sealing portion 250 can adopt a flexible sealing material, so as to further simulate the real downhole situation. A third sealing portion 260 is provided in the inner cavity of the sealing barrel 270, and the third sealing portion 260 is connected to the second sealing portion 250. Such a design can further improve the tightness of the simulation test assembly. The test method includes the following steps:

[0046] A. Pass the simulation test string 400 through the equipment connection assembly 120, the sealing barrel 270, the first sealing portion 240, the second sealing portion 250, the third sealing portion 260 and the simulation test sensor 230 and fixedly connect it to the fixed base 220;

[0047] B. The device to be tested is the working ram 800, and the working ram 800 is fixedly connected to the equipment connection assembly 120;

[0048] C. Inject liquid or gas into the sealing barrel 270 through the injection valve 273;

[0049] D. Adjust the upward pushing force and downward pulling force of the simulation test cylinder 210;

[0050] E. Adjust the closing pressure of the working ram 800;

[0051] F. Obtain the data of liquid or gas at the ram valve 810 and / or the ram pressure gauge 820 on the working ram 800, and obtain the telescopic data of the simulation test cylinder 210 and / or the data of the simulation test sensor 230.

[0052] This type of test simulates the wellhead device and injects clear water or air (or other fluid media) to simulate different casings, so as to test the critical dynamic and static closing pressures of the working ram 800, determine the sealing state, and measure the leakage parameters, etc. Therefore, the simulation test assembly also needs to have a certain tightness. A sealing assembly is further connected to the side of the simulation test sensor 230 away from the fixed base 220. The sealing assembly includes a first sealing portion 240. The sealing barrel 270 is connected to the first sealing portion 240. One end of the sealing barrel 270 is connected to the first sealing portion 240, and the other end of the sealing barrel 270 is connected to the side of the simulation test frame 100 away from the simulation test cylinder 210. An injection pipe 271 is connected to the side wall of the sealing barrel 270. The injection pipe 271 is used to inject liquid and / or gas into the inner cavity of the sealing barrel 270. The position where the injection pipe 271 is connected to the side wall of the sealing barrel 270 is located at the place in the sealing barrel 270 where the sealing assembly is not connected. A pressure gauge 272 and an injection valve 273 are also connected to the injection pipe 271.

[0053] When performing a simulation test on the working ram 800, it is necessary to install the upper sealing barrel 270. After the sealing barrel 270 is connected to the fixed base 220, a first sealing portion 240 is also provided above the simulation test sensor 230. The purpose of this design is that when injecting gas and / or liquid into the sealing barrel 270 subsequently, the gas and / or liquid will not invade the simulation test sensor 230 and cause damage to the simulation test sensor 230, or even overflow from the connection between the sealing barrel 270 and the fixed base 220, resulting in inaccurate simulation test results. After one end of the sealing barrel 270 away from the fixed base 220 is installed on the side of the simulation test frame 100 away from the simulation test oil cylinder 210, the working ram 800 is installed on the sealing barrel 270. After the installation is completed, gas and / or liquid is injected into the sealing barrel 270 through the injection pipe 271, and the opening and closing and even the opening and closing degree of the injection valve 273 are adjusted through the pressure display of the pressure gauge 272, so that the pressure of the sealing barrel 270 meets the requirements, thereby being able to simulate the casing pressure in the real wellbore.

[0054] Under different casing pressures, this process can test the closing pressures of the working ram 800 under critical dynamic and static conditions. When the working ram 800 is in a sealed state, the parameters of the leakage of the working ram 800 are measured. And these leakage parameters are used as the hydraulic adjustment control parameters of other similar working rams under the same conditions in the subsequent automatic control during the operation. Moreover, by combining the telescoping of the simulation test oil cylinder 210, the frictional force magnitude of the relative movement of the sealing materials in the simulation test string 400 and the working ram 800 under the control pressure of different working rams 800 can be obtained. It is also possible to simulate and test the pressures on the upper and lower end faces of the working ram 800 when the balance system does not need to be opened, and it will not cause the opening pressure difference in the state of the front seal failure of the working ram 800, so that the service life of the sealing assembly of the working ram 800 under certain pressure difference conditions can be inferred.

[0055] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the protection scope of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A pressure-operated wellhead simulation test device, characterized in that: The invention comprises a simulation test frame (100), wherein the simulation test frame (100) comprises a test frame base (110), the simulation test frame (100) is used to fix a device to be tested, the test frame base (110) is fixedly connected with a simulation test component, the simulation test component is arranged inside the simulation test frame (100), the simulation test component is used to perform a simulation test on the device to be tested, and a device connection component (120) is arranged on a side of the simulation test frame (100) opposite to the test frame base (110), and the device connection component (120) is used to connect and fix the device to be tested.

2. The pressure-operated wellhead simulation test device according to claim 1 is characterized in that: The simulation test assembly comprises a simulation test cylinder (210), a closed end of the simulation test cylinder (210) is fixedly connected to the test frame base (110), and a telescopic end of the simulation test cylinder (210) is connected to a fixed base (220).

3. The pressure-operated wellhead simulation test device according to claim 2 is characterized in that: A cylinder pipe (211) is provided on the cylinder body of the simulation test cylinder (210); one end of the cylinder pipe (211) is connected to the simulation test cylinder (210); the other end of the cylinder pipe (211) is connected to a cylinder control component (500); and the cylinder control component (500) is used to control the simulation test cylinder (210) to extend and retract.

4. The pressure-operated wellhead simulation test device according to claim 3 is characterized in that: A pipe column fixing portion is provided at the middle of a side of the fixing base (220) away from the simulation test oil cylinder (210), and the pipe column fixing portion is used to fix the simulation test pipe column (400).

5. The pressure-operated wellhead simulation test device according to claim 4 is characterized in that: A simulation test sensor (230) is detachably connected to a side of the fixed base (220) away from the simulation test cylinder (210), and the simulation test sensor (230) is used to provide part of the data in the simulation test process. The simulation test sensor (230) is electrically connected to a control device (600), and the control device (600) is used to obtain data of the simulation test sensor (230).

6. The pressure-operated wellhead simulation test device according to claim 5 is characterized in that: A sealing assembly is also connected to a side of the simulation test sensor (230) away from the fixed base (220), and the sealing assembly includes a first sealing portion (240), a sealing barrel (270) is connected to the first sealing portion (240), one end of the sealing barrel (270) is connected to the first sealing portion (240), and the other end of the sealing barrel (270) is connected to a side of the simulation test frame (100) away from the simulation test cylinder (210).

7. The pressure-operated wellhead simulation test device according to claim 6 is characterized in that: A second sealing portion (250) is also provided in the inner cavity of the sealing barrel (270), and the second sealing portion (250) is connected to the first sealing portion (240); a third sealing portion (260) is also provided in the inner cavity of the sealing barrel (270), and the third sealing portion (260) is connected to the second sealing portion (250).

8. The pressure-operated wellhead simulation test device according to claim 7 is characterized in that: An injection pipe (271) is connected to the side wall of the sealing barrel (270), and the injection pipe (271) is used to inject liquid and / or gas into the inner cavity of the sealing barrel (270). The position where the injection pipe (271) is connected to the side wall of the sealing barrel (270) is located at a place in the sealing barrel (270) where the sealing assembly is not connected. The injection pipe (271) is also connected to a pressure gauge (272) and an injection valve (273).

9. A test method for a pressure-operated wellhead simulation test device, characterized in that: Using the pressure operation wellhead simulation test device according to claim 6, the test method comprises the following steps: A. The simulation test pipe column (400) is passed through the device connection assembly (120) and the simulation test sensor (230) is fixedly connected to the fixed base (220); B. The device to be tested is a slip assembly (700), and the slip assembly (700) is fixedly connected to the device connection assembly (120); C. adjusting the upward force and downward force of the simulation test cylinder (210); D. adjusting the holding force of the slip assembly (700); E. Obtaining the extension and retraction data of the simulation test cylinder (210) and / or the data of the simulation test sensor (230).

10. A test method for a pressure-operated wellhead simulation test device, characterized in that: Using the pressure operation wellhead simulation test device according to claim 8, the test method comprises the following steps: A. The simulation test column (400) is passed through the device connection assembly (120), the sealing barrel (270), the first sealing part (240), the second sealing part (250), the third sealing part (260) and the simulation test sensor (230) to be fixedly connected to the fixed base (220); B. The device to be tested is a working gate plate (800), and the working gate plate (800) is fixedly connected to the device connection assembly (120); C. injecting liquid or gas into the sealed barrel (270) through the injection valve (273); D. adjusting the upward force and downward force of the simulation test cylinder (210); E. adjusting the closing pressure of the working gate (800); F obtains data of liquid or gas at the gate valve (810) and / or the gate pressure gauge (820) on the working gate (800), and obtains extension and contraction data of the simulation test cylinder (210) and / or data of the simulation test sensor (230).

Images