High-temperature and high-pressure pipe string cutting experiment platform

Abstract

The present application relates to a kind of high temperature high pressure pipe string cutting experiment platform in, by joint, piston sleeve, piston, short section, support frame, clamping device, short joint, end cover, base, bottom plate composition.The joint is connected high pressure pump and piston sleeve, and when piston moves, the pressure in the cavity of piston sleeve rises, support frame is used to support experimental cutting pipe and keep from being contacted with the inner wall of short section, clamping device is fixed with pipe string, short joint and end cover are to provide sealed environment for experiment, heating band is for short section heating, bottom plate is used to install base.The present application is used for the casing, oil pipe and drill pipe mechanical internal cutting test in the simulated downhole high temperature high pressure working condition environment in petroleum field.This platform is complete, easy to operate, and can be used for functional test of downhole cutting tool.

Description

Technical Field

[0001] This invention belongs to the petroleum field and relates to a high-temperature and high-pressure tubing string internal cutting experimental platform for mechanical internal cutting tests of downhole tubing strings. Background Technology

[0002] As my country's oil and gas wells continue to develop towards high-temperature, high-yield, and ultra-deep wells, wellbore malfunctions such as the inability to retrieve chokes and the failure of gas lift valves may occur. Therefore, pressurized tubing string pulling for maintenance is necessary. However, tubing string sticking frequently occurs during the pulling process. The traditional method involves raising the tubing string to the neutral point and then inverting it to retrieve the upper part of the faulty string. However, this method is time-consuming, inefficient, and costly, severely disrupting oilfield production. Therefore, a new method is needed to effectively solve the sticking problem, reduce costs, and improve efficiency. Mechanical cutting technology relies on the rotation of a rotary table on the wellhead, which drives the mechanical cutting structure inside the downhole casing to cut the tubing and casing. For mechanical cutting technology, the most important aspects are the design of the mechanical cutting structure and the verification of its rationality. Generally, before the effectiveness of the mechanical cutting structure is fully confirmed, direct cutting work cannot be performed on old oil and gas wells. Furthermore, the high temperature and pressure environment at the bottom of the well necessitates mechanical cutting experiments before deployment. Therefore, it is necessary to develop a mechanical internal cutting experimental platform under high temperature and pressure conditions. Summary of the Invention

[0003] The purpose of this invention is to provide an indoor experimental platform that can simulate high-temperature and high-pressure downhole environments and complete the cutting of tubing, casing, and drill pipe. It can perform cutting experiments on tubing strings of different specifications and sizes, and ensure that the cut tubing is held in place and the experimental equipment is sealed. The high-temperature and high-pressure tubing string internal cutting experimental platform utilizes a mechanical cutting device to rotate and cut the tubing string, which can quickly obtain experimental data of the mechanical internal cutting structure and determine the stability, reliability, and feasibility of the structure.

[0004] The technical solution adopted in this invention is:

[0005] The high-temperature, high-pressure pipe string internal cutting experimental platform consists of a connector, piston sleeve, piston, short section, support frame, clamping device, short connector, end cap, base, and base plate. The connector has a small opening on the left end for connecting to the high-pressure pump, and a large opening on the right end with internal threads for connecting to the external threads on the left end of the piston sleeve. The piston is installed inside the piston sleeve, which has an air outlet, an oil inlet, and a thermometer hole, which must be sealed during the experiment. The right end of the piston sleeve has internal threads, and the external threads on the left end of the short section connect to the internal threads of the piston sleeve, and it is installed on the base. The support frame includes a pipe string support frame and an internal cutting system support frame. The pipe string support frame is placed horizontally inside the short section, and the pipe string to be cut is installed above the pipe string support frame. The internal cutting system support frame is placed horizontally inside the short section to support the internal cutting system. The short section is installed on the base, with the external threads on the right end of the short section connecting to the internal threads of the short connector. A heat tracing cable is installed on the outside of the short section, and the inside of the short section... The device is equipped with the pipe to be cut and an internal cutting system. The clamping device consists of a pipe string clamping sleeve, a screw, a fixing nut, and a handle. The pipe string clamping sleeve is installed at the lower end of the screw with a gap between it and the screw. The fixing nut restricts the free downward displacement of the pipe string clamping sleeve. The screw is threadedly connected to the short section. When the handle is turned, the rotating screw will drive the clamping sleeve to move downward. The screw shaft shoulder positions and restricts the upward displacement of the pipe string clamping sleeve to clamp the pipe string to be cut and prevent excessive vibration or displacement during cutting, which would cause the experiment to fail. A high-temperature and high-pressure connector is installed in the through hole in the middle of the short connector. The end cap and the short connector are connected by screws. The countersunk hole in the middle of the end cap restricts the axial movement of the high-temperature and high-pressure connector. The base is fixed to the base plate and connected by double-ended studs.

[0006] The high-temperature and high-pressure pipe string internal cutting experimental platform described above requires the following conditions to achieve high temperature and high pressure: A heating cable is installed on the outside of the short section and energized during the experiment to heat it to the required temperature. A thermometer is installed in the temperature gauge hole of the piston sleeve to accurately measure the liquid temperature inside the short section. The high-pressure conditions are implemented as follows: Hydraulic oil is injected into the right cavity of the piston through the oil inlet of the piston sleeve. A high-pressure pump delivers the liquid, causing the piston to move to the right within the piston sleeve (inner cavity), increasing the pressure on the right side of the piston. The high-pressure pump can read the pressure. The pipe string internal cutting system circuit is connected to the outside via a high-temperature and high-pressure connector. Attached Figure Description

[0007] Figure 1 This is a schematic diagram of the structure of the present invention;

[0008] Figure 2 This is a schematic diagram of the piston sleeve structure of the present invention;

[0009] Figure 3 This is a side view of the pipe fitting of the present invention when it is clamped.

[0010] Figure 4 This is a schematic diagram of the tube string support frame structure of the present invention;

[0011] Figure 5This is a schematic diagram of the installation position of the clamping device of the present invention;

[0012] Figure 6 This is a schematic diagram of the clamping sleeve structure of the present invention;

[0013] Figure 7 This is a schematic diagram of the internal cutting system support frame structure of the present invention;

[0014] Figure 8 This is a schematic diagram of the connector structure of the present invention;

[0015] In the diagram: 1. Connector, 2. Piston sleeve, 2a. Vent, 2b. Oil inlet, 2c. Thermometer hole, 3. Piston, 4. Short section, 5. Screw, 5a. Positioning shoulder, 6. Pipe to be cut, 7. Clamping sleeve, 8. Internal cutting system, 9. Internal cutting system support frame, 10. Short section head, 11. High temperature and high pressure connector, 12. End cap, 13. Base, 14. Base plate, 15. Heating tape, 16. Pipe string support frame, 17. Fixing nut, 18. Handle. Detailed Implementation

[0016] The invention will now be further described with reference to the accompanying drawings.

[0017] like Figure 1 and Figure 3 As shown, the high-temperature and high-pressure pipe string internal cutting experimental platform is characterized by comprising a connector, piston sleeve, piston, short section, support frame, clamping device, short connector, end cap, base, and base plate. The connector 1 has a small opening at the left end for connecting to the high-pressure pump, and a large opening at the right end with internal threads for connecting to the external threads at the left end of the piston sleeve 2. The piston 3 is installed in the inner cavity of the piston sleeve 2. The piston sleeve 2 has an air outlet 2a, an oil inlet 2b, and a temperature gauge hole 2c, and has internal threads at its right end. The short section 4 has external threads at its left end that connect to the internal threads of the piston sleeve 2 and is installed on the base 13.

[0018] like Figure 4 and Figure 7 As shown, the support frame of the high-temperature and high-pressure pipe string internal cutting experimental platform includes a pipe string support frame 16 and an internal cutting system support frame 9. The pipe string support frame 16 is placed horizontally inside the short section 4, and the pipe string to be cut 6 is installed above the pipe string support frame. The internal cutting system support frame 9 is placed horizontally inside the short section 4 to support the internal cutting system.

[0019] like Figure 5As shown, the clamping device of the high-temperature and high-pressure tube string internal cutting experimental platform consists of a tube string clamping sleeve 7, a screw 5, a fixing nut 17, and a handle 18. The tube string clamping sleeve 7 is installed at the lower end of the screw 5 with a gap between it and the screw 5. The fixing nut 17 restricts the free downward displacement of the tube string clamping sleeve 7. The screw 5 is threadedly connected to the short section 4. When the handle 18 is turned, the rotating screw 5 will drive the clamping sleeve 7 to move downward. The screw shaft shoulder 5a is used to position and restrict the upward displacement of the tube string clamping sleeve 7, so as to clamp the tube string 6 to be cut to prevent excessive vibration or displacement during cutting, which would cause the experiment to fail.

[0020] The short section 4 is mounted on the base 13. The external thread on the right end of the short section 4 is connected to the internal thread of the short connector 10. A heat tracing cable 15 is installed on the outside of the short section 4 and a threaded hole is machined on the surface of the short section 4. The pipe to be cut 6 and the internal cutting system 8 are installed inside the short section 4.

[0021] The short connector 10 has a through hole in the middle where a high-temperature and high-pressure connector 11 is installed. The end cap 12 and the short connector 10 are connected by screws. The countersunk hole in the middle of the end cap restricts the axial movement of the high-temperature and high-pressure connector 11. The base 13 is fixed on the base plate 14 and connected by double-ended studs.

[0022] Furthermore, the high-temperature and high-pressure tube string internal cutting experimental platform has the following high-temperature conditions: a heating cable 15 is installed on the outside of the short section 4 and energized during the experiment to heat it to the required experimental temperature; a thermometer is installed in the thermometer hole 2c of the piston sleeve 2 to accurately measure the liquid temperature inside the short section 4. The high-pressure conditions are implemented as follows: hydraulic oil is injected into the right cavity of the piston 3 through the oil inlet hole 2b of the piston sleeve 2; the high-pressure pump delivers the liquid, causing the piston 3 to move to the right in the piston sleeve (inner cavity), increasing the pressure on the right side of the piston 3; the high-pressure pump can read the pressure; and the tube string internal cutting system 8 circuit is connected to the outside through the high-temperature and high-pressure connector 11.

[0023] Furthermore, the high-temperature and high-pressure pipe string internal cutting experimental platform has a pressure range of 2MPa~60MPa for the short section 4, a platform heating temperature of 10℃~180℃, and the short section 4 can be filled with clean water, drilling fluid or oil according to the experiment.

[0024] The specific embodiments described above are for illustrative purposes only and are not intended to limit the scope of this patent. Any equivalent changes and modifications made by those skilled in the art without departing from the concept and principles of this patent shall fall within the protection scope of this patent system.

Claims

1. A high-temperature and high-pressure pipe string internal cutting experimental platform, used to simulate a high-temperature and high-pressure downhole environment, characterized in that: The high-temperature and high-pressure pipe string internal cutting experimental platform consists of a connector, piston sleeve, piston, short section, support frame, clamping device, short connector, end cap, base, and base plate. The connector (1) has a small opening on the left end for connecting to the high-pressure pump, and a large opening on the right end with an internal thread for connecting to the external thread on the left end of the piston sleeve (2). The piston (3) is installed in the inner cavity of the piston sleeve (2). The piston sleeve (2) has an air outlet (2a), an oil inlet (2b), and a temperature gauge hole (2c). The right end has an internal thread. The short section (4) has an external thread on the left end and connects to the piston sleeve (2a). 2) Internal thread connection and installation on base (13); the support frame includes pipe string support frame (16) and internal cutting system support frame (9). The pipe string support frame (16) is horizontally placed inside the short section (4). The pipe string to be cut (6) is installed above the pipe string support frame. The internal cutting system support frame (9) is horizontally placed inside the short section (4) to support the internal cutting system. The short section (4) is installed on base (13). The short connector (10) is internally threaded and externally threaded at the right end of the short section (4). A heat tracing cable (1) is installed on the outside of the short section (4). 5) The short section (4) has a threaded hole machined on its surface. The short section (4) contains the pipe string to be cut (6) and the internal cutting system (8). The clamping device consists of a pipe string clamping sleeve (7), a screw (5), a fixing nut (17), and a handle (18). The pipe string clamping sleeve (7) is installed at the lower end of the screw (5) with a gap. The fixing nut (17) restricts the free downward displacement of the pipe string clamping sleeve (7). The threaded hole on the short section (4) is threadedly connected to the screw (5). When the handle (18) is turned, the rotating pipe string clamping sleeve (6) is connected to the screw (5). The screw (5) will drive the clamping sleeve (7) to move downward. The screw shaft shoulder (5a) positions and restricts the upward displacement of the pipe string clamping sleeve (7) to clamp the pipe string to be cut (6) to prevent excessive vibration or displacement during cutting, which would cause the experiment to fail. The high temperature and high pressure connector (11) is installed in the through hole in the middle of the short connector (10). The end cap (12) and the short connector (10) are connected by screws. The countersunk hole in the middle of the end cap restricts the axial movement of the high temperature and high pressure connector (11). The base (13) is fixed on the base plate (14) and connected by double-ended studs.

2. The high-temperature and high-pressure pipe string internal cutting experimental platform according to claim 1, characterized in that: The high-temperature conditions are as follows: a heating tape (15) is installed on the outside of the short section (4) and energized during the experiment to heat it to the temperature required for the experiment. A thermometer is installed in the thermometer hole (2c) of the piston sleeve (2) to accurately measure the liquid temperature inside the short section (4). The high-pressure conditions are as follows: hydraulic oil is injected into the right cavity of the piston (3) through the oil inlet hole (2b) of the piston sleeve (2). The high-pressure pump delivers the liquid to drive the piston (3) to move to the right in the inner cavity of the piston sleeve, increasing the pressure on the right side of the piston (3). The high-pressure pump can read the pressure. The circuit of the pipe string cutting system (8) is connected to the outside through the high-temperature and high-pressure connector (11).

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