High-temperature and high-pressure holder for erosive metal sample wafer and simulation method of high-temperature and high-pressure holder

Abstract

The invention discloses a high-temperature and high-pressure clamp holder for an erosive metal sample wafer and a simulation method thereof.The high-temperature and high-pressure clamp holder comprises a clamp holder kettle body, the clamp holder kettle body is a cylinder, a sealing middle shaft is arranged at the center of one end of the clamp holder kettle body, the sealing middle shaft and the clamp holder kettle body are coaxial, a gland is arranged at the end of the sealing middle shaft, an erosive sample wafer mounting position is arranged at the end of the gland, and the erosive sample wafer mounting position is arranged at the end of the gland. The other end of the holder kettle body is connected with a hand pump, the outer cylindrical surface of the holder kettle body is wrapped with a heating jacket, the heating jacket is connected with a temperature sensor, and a pressure sensor is arranged in the holder kettle body. On the premise that other erosion influence factors are not affected, high simulation of the erosion temperature and pressure working condition is achieved for the first time through the design thought of the semi-open type clamp holder, the structure is simple, operation is convenient, temperature and pressure simulation of the erosion wear environment of the oil and gas field metal pipe can be achieved through the semi-open type working principle, and the test efficiency is improved. And specifically, long-time simulation operation of an eroded sample wafer under the conditions of normal pressure of 20MPa and room temperature of 200 DEG C can be realized, and the practicability is high.

Description

Technical Field

[0001] The invention belongs to the technical field of experimental research on erosion and wear of oil and gas field pipes, and in particular relates to a high-temperature and high-pressure clamp for eroded metal specimens and a simulation method thereof. Background Art

[0002] Erosion and wear is one of the main forms of equipment failure. In actual applications, most of the various types of downhole tool joints, elbows, Christmas trees, nozzles, and surface manifolds in oil and gas fields have many failures caused by erosion and wear. High-speed fluids carrying solid particles will cause a significant decrease in the equipment's carrying capacity and even cause perforation of the pipe wall, thus causing serious safety hazards in production.

[0003] As people's demand for oil and gas resources increases, the production of oil and gas fields increases, resulting in more serious economic losses caused by erosion and wear. Therefore, people's analysis and research on erosion and wear are also constantly improving. Studies have found that the temperature and pressure of erosion tools in oil and gas fields are the main factors affecting erosion. However, at present, there are few erosion test research devices at home and abroad to simulate it. In the face of this problem, it is imperative to design an erosion test device that can simulate field conditions. The design and processing of high-temperature and high-pressure clamps for eroded metal specimens is its core key technology. Therefore, there is an urgent need for a high-temperature and high-pressure clamp that can meet the needs of erosion test devices and its simulation method. Summary of the invention

[0004] The problem to be solved by the present invention is to provide a high-temperature and high-pressure holder for eroded metal specimens and a simulation method thereof, especially an erosion test device with a simple structure and convenient operation, which is suitable for simulating field working conditions and simulating the temperature and pressure that affect the erosion and wear of pipes.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is: a high-temperature and high-pressure clamp for eroded metal samples, including a clamp kettle body, the clamp kettle body is a cylinder, a sealing center axis is provided at the center of one end of the clamp kettle body, the sealing center axis is coaxial with the clamp kettle body, a pressure cover is provided at the end of the sealing center axis, an erosion sample installation place is provided at the end of the pressure cover, which is used to install the erosion sample, the other end of the clamp kettle body is connected to a hand pump, the outer cylindrical surface of the clamp kettle body is wrapped with a heating jacket, the heating jacket is connected to a temperature sensor, and a pressure sensor is provided inside the clamp kettle body.

[0006] Furthermore, a hand pump connection port is provided at the center of the end of the clamp kettle body, the hand pump connection port is coaxial with the clamp kettle body, and the hand pump connection port is connected to the hand pump through a high-pressure pipeline.

[0007] Furthermore, the interior of the holder kettle body is a hollow structure, and the hollow structure is connected to the hand pump connection port.

[0008] Furthermore, the hand pump uses hydraulic oil for pressurization, and the hydraulic oil is placed in a hydraulic oil storage tank.

[0009] Furthermore, the holder kettle body is a double-layer structure.

[0010] Furthermore, the sealing center axis is installed inside the clamp kettle body, and the sealing center axis and the inner wall of the clamp kettle body are sealed.

[0011] Furthermore, the outer cylindrical surface of the sealing center shaft is provided with an external thread, and the inner cylindrical surface of the pressure cover is provided with an internal thread, and the external thread cooperates with the internal thread.

[0012] Furthermore, a base is provided at the bottom of the holder kettle body.

[0013] Furthermore, the present invention also provides a method for simulating high temperature and high pressure erosion of an eroded metal sample, using the above-mentioned high temperature and high pressure holder for the eroded metal sample, comprising the following steps:

[0014] S1: Operate the hand pump to allow the pressurized hydraulic oil to enter the inside of the holder kettle, push the sealing center axis to move, and support the non-eroded surface of the eroded sample;

[0015] S2: The pressure increased by the hand pump is transmitted to the back of the erosion sample through the sealing center shaft, thereby simulating the pressure difference that the metal pipe is subjected to when being eroded.

[0016] Furthermore, the method further includes S3, starting the heating jacket to adjust the internal temperature of the holder kettle body to simulate the temperature difference that the metal pipe is subjected to when being eroded.

[0017] The advantages and positive effects of the present invention are:

[0018] Temperature and pressure are the main influencing factors of erosion and wear of metal pipes in oil and gas fields. However, there is currently no erosion test device that can simulate temperature and pressure. Under the premise of not affecting other erosion influencing factors, the present invention solves the high-level simulation of erosion temperature and pressure conditions for the first time with the design idea of ​​a semi-open clamp. The present invention has a simple structure and is easy to operate. Through the semi-open working principle, the temperature and pressure simulation of the erosion and wear environment of metal pipes in oil and gas fields can be realized. Specifically, the eroded sample can be simulated for a long time under the conditions of normal pressure ~ 20MPa and room temperature ~ 200℃, and it is highly practical. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a cross-sectional view of the overall structure of an embodiment of the present invention.

[0020] Figure 2 It is a schematic diagram of the overall structure of an embodiment of the present invention.

[0021] Figure 3 It is an overall structural application state diagram of an embodiment of the present invention.

[0022] In the figure:

[0023] 1. Heating jacket; 2. Hand pump connection port; 3. Sealing center axis;

[0024] 4. Gland; 5. Erosion sample installation location; 6. Pressure sensor;

[0025] 7. Temperature sensor; 8. Clamp kettle; 9. Hand pump;

[0026] 10. Hydraulic oil storage tank. DETAILED DESCRIPTION

[0027] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. 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.

[0028] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0029] In the description of the present invention, it should be noted that, 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 mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected 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.

[0030] The embodiments of the present invention are further described below in conjunction with the accompanying drawings:

[0031] like Figure 1-3As shown, a high-temperature and high-pressure clamp for eroded metal samples includes a clamp kettle 8, which is a cylindrical body. Preferably, the clamp kettle 8 is a double-layer structure. A sealing central axis 3 is provided at the center of one end of the clamp kettle 8. The sealing central axis 3 is coaxial with the clamp kettle 8. Preferably, the sealing central axis 3 is installed inside the clamp kettle 8, and the sealing central axis 3 and the inner wall of the clamp kettle 8 are sealed. A gland 4 is provided at the end of the sealing central axis 3. Preferably, the outer cylindrical surface of the sealing central axis 3 is provided with an external thread, and the inner cylindrical surface of the gland 4 is provided with an internal thread. The external thread and the internal thread cooperate to realize the connection between the sealing central axis 3 and the gland 4. An eroded sample installation place 5 is provided at the end of the gland 4 for installing the eroded sample. The other end of the clamp kettle 8 is connected to a hand pump 9, and the outer cylindrical surface of the clamp kettle 8 is wrapped with a heating sleeve 1, and the heating sleeve 1 is connected to a temperature sensor 7. A pressure sensor 6 is provided inside the clamp kettle 8.

[0032] Preferably, a hand pump connection port 2 is provided at the center of the end of the clamp kettle 8, and the hand pump connection port 2 is coaxial with the clamp kettle 8, and the hand pump connection port 2 is connected to the hand pump 9 through a high-pressure pipeline. The hand pump 9 uses hydraulic oil for pressurization, and the hydraulic oil is placed in a hydraulic oil storage tank 10. The interior of the clamp kettle 8 is a hollow structure, and the hollow structure is connected to the hand pump connection port 2. The hand pump 9 is manually operated to allow the pressurized hydraulic oil to enter the interior of the clamp kettle 8, push the sealing center axis 3 to move, and support the non-eroded surface of the eroded sample. The pressure increased by the hand pump 9 is transmitted to the back of the eroded sample through the sealing center axis 3, achieving the pressure difference that simulates the metal pipe when it is eroded. Start the heating sleeve 1, adjust the internal temperature of the clamp kettle 8, and achieve the temperature difference that simulates the metal pipe when it is eroded.

[0033] Preferably, a base is provided at the bottom of the holder kettle body 8.

[0034] The working principle of the present invention is as follows:

[0035] The present invention can realize the temperature and pressure simulation of the erosion and wear environment of metal pipes in oil and gas fields through the semi-open working principle. Specifically, the erosion environment of downhole pipes is simulated, the inner side of the wellbore is the erosion and wear surface, the outer side of the wellbore is the temperature and pressure bearing surface, the erosion surface of the semi-open clamp faces the erosion component and is an open surface, and the temperature and pressure bearing surface is a non-open surface.

[0036] The present invention is a non-open surface, and its specific structure mainly includes a temperature control system and a pressurization system. The temperature control system is composed of a heating jacket 1 of the clamp outer jacket and a temperature sensor 7. The heating jacket 1 is started to adjust the internal temperature of the clamp kettle body 8 to simulate the temperature difference that the metal pipe is subjected to when being eroded.

[0037] The pressurization system consists of a holder kettle 8, a sealing center shaft 3, a pressure sensor 6, a gland 4 and a high-precision hand pump 9. Practical applications show that the holder can ensure accurate simulation and long-term stable operation within the range of normal pressure to 20MPa and room temperature to 200℃.

[0038] The advantages and positive effects of the present invention are:

[0039] Temperature and pressure are the main influencing factors of erosion and wear of metal pipes in oil and gas fields. However, there is currently no erosion test device that can simulate temperature and pressure. Under the premise of not affecting other erosion influencing factors, the present invention solves the high-level simulation of erosion temperature and pressure conditions for the first time with the design idea of ​​a semi-open clamp. The present invention has a simple structure and is easy to operate. Through the semi-open working principle, the temperature and pressure simulation of the erosion and wear environment of metal pipes in oil and gas fields can be realized. Specifically, the eroded sample can be simulated for a long time under the conditions of normal pressure ~ 20MPa and room temperature ~ 200℃, and it is highly practical.

[0040] The embodiments of the present invention are described in detail above, but the contents described are only preferred embodiments of the present invention and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. A high temperature and high pressure holder for eroded metal specimens, characterized in that: It includes a clamp kettle body, which is a cylinder. A sealing central axis is provided at the center of one end of the clamp kettle body. The sealing central axis is coaxial with the clamp kettle body. A pressure cover is provided at the end of the sealing central axis. An erosion sample installation position is provided at the end of the pressure cover for installing the erosion sample. The other end of the clamp kettle body is connected to a hand pump. The outer cylindrical surface of the clamp kettle body is wrapped with a heating sleeve. The heating sleeve is connected to a temperature sensor. A pressure sensor is provided inside the clamp kettle body.

2. The high temperature and high pressure holder for eroded metal specimens according to claim 1, characterized in that: A hand pump connection port is provided at the center of the end of the clamp kettle body, the hand pump connection port is coaxial with the clamp kettle body, and the hand pump connection port is connected to the hand pump through a high-pressure pipeline.

3. The high temperature and high pressure holder for eroded metal specimens according to claim 2, characterized in that: The interior of the holder kettle body is a hollow structure, and the hollow structure is communicated with the hand pump connection port.

4. A high temperature and high pressure holder for eroded metal specimens according to any one of claims 1 to 3, characterized in that: The hand pump uses hydraulic oil for pressurization, and the hydraulic oil is placed in a hydraulic oil storage tank.

5. A high temperature and high pressure holder for eroded metal specimens according to any one of claims 1 to 3, characterized in that: The holder kettle body is a double-layer structure.

6. A high temperature and high pressure holder for eroded metal specimens according to any one of claims 1 to 3, characterized in that: The sealing center shaft is installed inside the clamp kettle body, and the sealing center shaft and the inner wall of the clamp kettle body are sealed.

7. A high temperature and high pressure holder for eroded metal specimens according to any one of claims 1 to 3, characterized in that: The outer cylindrical surface of the sealing center shaft is provided with an external thread, and the inner cylindrical surface of the gland is provided with an internal thread, and the external thread matches the internal thread.

8. A high temperature and high pressure holder for eroded metal specimens according to any one of claims 1 to 3, characterized in that: A base is provided at the bottom of the holder kettle body.

9. A method for simulating high temperature and high pressure erosion of an eroded metal specimen, using the high temperature and high pressure holder for an eroded metal specimen according to any one of claims 1 to 8, characterized in that: The following steps are included: S1: Operate the hand pump to allow the pressurized hydraulic oil to enter the inside of the holder kettle, push the sealing center axis to move, and support the non-eroded surface of the eroded sample; S2: The pressure increased by the hand pump is transmitted to the back of the erosion sample through the sealing center shaft, thereby simulating the pressure difference that the metal pipe is subjected to when being eroded.

10. The high temperature and high pressure erosion simulation method for eroded metal specimens according to claim 9, characterized in that: The method further includes S3, starting the heating jacket to adjust the internal temperature of the holder kettle body to achieve a temperature difference that simulates the temperature difference that the metal pipe is subjected to when being eroded.

Images