Petroleum drilling underreamer control valve spool testing device and method

Abstract

This invention provides a testing device for the control valve core of an oil drilling reamer, comprising: a first electromagnetic directional valve, an air compressor, a gas-liquid conversion booster cylinder, a first one-way valve, a second one-way valve, a second electromagnetic directional valve, a water tank, and a pressure gauge. The liquid chamber of the gas-liquid conversion booster cylinder is sequentially connected to the water tank via the first one-way valve and the first electromagnetic directional valve. The liquid chamber of the gas-liquid conversion booster cylinder is connected to the mud input end of the control valve core under test via the second one-way valve. The rodless gas chamber and the rod gas chamber of the gas-liquid conversion booster cylinder are connected to the air compressor via the second electromagnetic directional valve. The pressure gauge is installed on the connecting pipeline between the second one-way valve and the control valve core. This invention can simulate the actual flow state of the mud during the entire tool operation and can directly read the system pressure changes during the valve core compression process, providing relatively realistic measurement data.

Description

Technical Field

[0001] This invention relates to the field of oil drilling control, and in particular to a testing device and method for the control valve core of an oil drilling reamer. Background Technology

[0002] Figure 1 A schematic diagram of the structure of an oil drilling tool is shown, such as... Figure 1 As shown, the tool mainly consists of three parts: the upper drill string A1, the control valve assembly A2, and the lower drill string A3. These parts are connected by threaded external tubes. The structure of the control valve assembly A2 is as follows: Figure 2 As shown.

[0003] Please refer to Figure 2 The control valve assembly A2 is mainly composed of valve chamber 1, bypass valve piston 2, spring 7, bypass valve upper sleeve 8, guide pin 9, bypass valve positioning pin 10, bypass valve bottom sleeve 18, piston nozzle 22, axial thrust sleeve 26, sliding sealing sleeve 27 and other parts.

[0004] Figure 2 The position shown indicates that spring 7 is in its reset state. At this time, the mud pump is unloaded, and the bypass valve piston's outlet C is not connected to outlet B or outlet A. High-pressure mud cannot pass through outlet A to connect with the lower tool and actuator. The guide pin 9 is at position P2 in the guide groove of the bypass valve piston 2. Figure 3 As shown.

[0005] When the high-pressure mud pump is turned on, the high-pressure mud enters from the left port V1 and exits from the right port V2. When the high-pressure mud passes through the piston nozzle 22, it generates a certain pressure loss, which pushes the bypass valve piston 2 to move slowly to the right. At this time, the spring 7 is compressed, the volume of the spring cavity decreases, and the oil in the spring cavity chamber D enters the cavity chamber E through the flow channel between the thrust bearing 4 and the axial thrust sleeve 26.

[0006] Cavity E and cavity F are separated by a sliding sealing sleeve 27, with cavity F connected to the mud flow channel. Both the outer circumference and inner bore of the sliding sealing sleeve 27 are fitted with O-rings, allowing it to slide freely on the outer circumference of the axial thrust sleeve 26 to balance the pressure difference between cavity E and cavity F. To reduce displacement of the sliding sealing sleeve 27 during operation, the volume of cavity E is made larger than the volume required after compression by the spring during its working stroke. The mud in cavity F is discharged through the drain hole G along the direction of the arrow shown in V3, through the flow channel gap between the outer surface of valve chamber 1 and the inner bore of outer tube 33, into the annulus between outer tube 33 and the well wall.

[0007] When the bypass valve piston 2 continues to move to the right, the bottom surface M of the rectangular toothed claw on the right end face of the bypass valve piston rod contacts the boss end face N of the inner hole of the bypass valve bottom sleeve 18. At this time, the guide pin 9 is at the uppermost end P1 of the guide groove of the bypass valve piston 2. At this time, the bypass valve piston is completely compressed, and the high-pressure mud in the center hole of the bypass valve piston 2 flows through outlet C, through outlet B, and into outlet A, and flows from outlet A into the actuator of the lower tool to work.

[0008] When the mud pump stops, due to the decrease in pressure on the left end face of the bypass valve piston 2, under the action of the reset thrust of the spring 7, the bypass valve piston 2 slowly moves from right to left, and at the same time, outlet C, outlet B, and outlet A are closed. Due to the increase in volume of the mounting chamber of spring 7, the volume of spring cavity D increases, and the volume of cavity E decreases, causing oil flow.

[0009] When the slurry outside the tool flows into the cavity F, the guide pin 9 rotates from position P1 to position P2 along the guide groove of the bypass valve piston 2, waiting for the next command. When the slurry pump restarts, the high-pressure slurry flows through the piston nozzle 22 on the left end face of the bypass valve piston 2, generating a certain pressure loss. This pressure pushes the bypass valve piston 2 to move from left to right. At this time, the guide pin 9 slides slowly from position P2 to position P3 along the guide groove of the bypass valve piston 2. When the guide pin 9 moves to position P3, the right end face H of the bypass valve piston 2 just contacts and limits the contact with the end face N of the boss in the inner hole of the bypass valve bottom sleeve 18. Even if the pump pressure is increased, the guide pin 9 always stays at position P3. At this time, outlet C is not connected to outlet B and outlet A. The high-pressure slurry can enter from the left side of the inner hole of the bypass valve piston 2 along the V1 direction and flow out from the right side along the V2 direction, entering the lower tool to perform the working task. When the mud pump is unloaded, the bypass valve piston 2 will move from right to left. At this time, the guide pin 9 will return from position P3 to position P2 along the guide groove of the bypass valve piston 2, and the cycle will repeat.

[0010] As can be seen from the above working process, as the mud pump repeatedly switches between starting and stopping, the guide pin 9 will slide in the spiral groove of the bypass valve piston 2, and the bypass valve piston 2 will generate rotational motion and left and right linear motion to complete different mode switching.

[0011] To ensure that design requirements are met, current research and development of new oil drilling tools lacks a comprehensive performance testing platform for assembled valve components; testing is only conducted on individual components like compression return springs. Each spring is tested separately at the spring manufacturer using tensile and compressive testing equipment to ensure it meets design requirements. This testing is typically performed at the spring manufacturer.

[0012] After the valve assembly is assembled, the performance of the valve assembly needs to be tested in the assembly workshop. A force gauge is used to apply a force to the bypass valve piston to test the magnitude of the force required for the piston rod to move from position P2 to position P1 and P3 respectively. This allows for the actual measurement of comprehensive factors such as the valve spring's switching pressure, working stroke, pre-compression amount, pre-compression force, spring return force, ability to overcome return resistance, smooth transition of the valve core, and smooth sliding of the guide pin in the guide groove within the valve core. This ensures that the valve core assembly can work normally after assembly.

[0013] However, when testing using the above method, it is inconvenient and not intuitive to obtain the magnitude of the force, and the force value is not accurate enough. Therefore, it is impossible to realistically simulate the actual flow state of the mud when the tool is working, and it is also inconvenient to directly read the system pressure change during the valve core compression process. The measurement data is not accurate enough. Summary of the Invention

[0014] This invention provides a testing device and method for the control valve core of an oil drilling reamer, in order to solve at least one of the above-mentioned technical problems.

[0015] To address the aforementioned problems, as one aspect of the present invention, a testing device for the control valve core of an oil drilling reaming tool is provided, comprising: a first electromagnetic directional valve, an air compressor, a gas-liquid conversion booster cylinder, a first one-way valve, a second one-way valve, a second electromagnetic directional valve, a water tank, and a pressure gauge. The liquid chamber of the gas-liquid conversion booster cylinder is sequentially connected to the water tank via the first one-way valve and the first electromagnetic directional valve. The liquid chamber of the gas-liquid conversion booster cylinder is connected to the mud input end of the control valve core under test via the second one-way valve. The rodless gas chamber and the rod gas chamber of the gas-liquid conversion booster cylinder are connected to the air compressor via the second electromagnetic directional valve. The pressure gauge is disposed on the connecting pipeline between the second one-way valve and the control valve core.

[0016] Preferably, the connecting pipeline between the second check valve and the control valve core is connected to the water tank through a third electromagnetic directional valve.

[0017] Preferably, the first and third solenoid directional valves are two-position three-way solenoid directional valves, and the second solenoid directional valve is a two-position five-way solenoid directional valve.

[0018] This invention also provides a method for testing the control valve core of an oil drilling reamer, using the aforementioned oil drilling reamer control valve core testing device, comprising the following steps:

[0019] Step 1: Use a plug to block the inner hole of the bypass valve piston at the left end face of the control valve core to ensure that there is no leakage at the plug.

[0020] Step 2: Install the sealing end cover flange at the end of the bypass valve piston, so that the vent hole is located at the top of its outer circle, and open the vent hole plug at the top of the sealing end cover flange.

[0021] Step 3: Open the first electromagnetic reversing valve to allow low-pressure water to enter the liquid chamber of the gas-liquid conversion booster cylinder from the water tank through the first one-way valve, and then enter the cavity D formed between the control valve core and the sealing end cover flange through the second one-way valve.

[0022] Step 4: When the low-pressure water fills the mold cavity D and the liquid cavity, plug the vent hole plug and open the second solenoid reversing valve. By controlling the second solenoid reversing valve, the piston in the gas-liquid conversion booster cylinder pressurizes the low-pressure water in the liquid cavity and flows into the mold cavity D, thereby pushing the bypass valve piston of the control valve core to move from left to right and compress the spring in the control valve core.

[0023] Step 5: When the piston of the gas-liquid conversion booster cylinder reaches the lowest point, the second electromagnetic reversing valve is reversed so that the piston moves upward, thereby generating negative pressure in the liquid chamber, and using this negative pressure to draw in low-pressure water from the water tank and fill the liquid chamber.

[0024] Step 6: Switch the second electromagnetic reversing valve so that the piston in the gas-liquid conversion booster cylinder pressurizes the low-pressure water in the liquid chamber and flows into the mold cavity D, and pushes the bypass valve piston to continue moving to the right to compress the spring.

[0025] Step 7: Repeat steps 5 and 6 until the bypass valve piston reaches the rightmost bottom working position to control the guide pin of the control valve core to switch between different positions, thereby realizing the working mode conversion of the control valve core.

[0026] Step 8: Based on the pressure displayed on the pressure gauge during the working mode conversion, determine the system pressure change during the compression process of the control valve core to simulate the actual mud flow state during the operation of the entire oil drilling reamer.

[0027] Preferably, it further includes: reversing the third electromagnetic reversing valve to open the bypass pressure relief water passage so that the high-pressure water in the cavity D is unloaded and flows into the water tank through the third electromagnetic reversing valve.

[0028] Because of the above technical solution, this invention can conduct a special pressure test on the maximum force required for the working mode conversion of the control valve core. This invention can directly use the existing air source (or air machine) in the workshop to form a pressurization system, increase the water pressure in the water tank to the required pressure, push the bypass valve piston to move, and complete the working mode conversion. This can simulate the actual flow state of mud when the tool is working, and can directly read the system pressure change during the valve core compression process. The measurement data is relatively realistic. Attached Figure Description

[0029] Figure 1 A schematic diagram of the structure of the oil drilling reaming tool of the present invention is shown.

[0030] Figure 2 A schematic cross-sectional view of the control valve core is shown.

[0031] Figure 3 A schematic diagram of the external structure of the control valve core is shown.

[0032] Figure 4 A schematic diagram of the hydraulic principle of the testing device in this invention is shown. Detailed Implementation

[0033] The embodiments of the present invention will be described in detail below, but the present invention can be implemented in many different ways as defined and covered by the claims.

[0034] It should be noted that the test object targeted by this invention is... Figures 1 to 3 The control valve core of the oil drilling tool shown in the figure, the structure and principle of the control valve core described in the background art are all part of the specific embodiments and technical solutions of the present invention, and are directly cited and incorporated herein. For the sake of simplicity, they will not be repeated here.

[0035] As one aspect of the present invention, a testing device for the control valve core of an oil drilling reaming tool is provided, comprising: a first electromagnetic directional valve 101, an air compressor 102, a gas-liquid conversion booster cylinder 103, a first one-way valve 104, a second one-way valve 105, a second electromagnetic directional valve 106, a water tank 107, and a pressure gauge 108. The liquid chamber 109 of the gas-liquid conversion booster cylinder 103 is connected to the water tank 107 in sequence through the first one-way valve 104 and the first electromagnetic directional valve 101. The liquid chamber 109 of the gas-liquid conversion booster cylinder 103 is connected to the mud input end of the control valve core under test through the second one-way valve 105. The rodless gas chamber 110 and the rod gas chamber 111 of the gas-liquid conversion booster cylinder 103 are connected to the air compressor 102 through the second electromagnetic directional valve 106. The pressure gauge 108 is disposed on the connecting pipeline between the second one-way valve 105 and the control valve core.

[0036] Preferably, the connecting pipeline between the second one-way valve 105 and the control valve core is connected to the water tank 107 through the third electromagnetic reversing valve 112.

[0037] Preferably, the first solenoid directional valve 101 and the third solenoid directional valve 112 are two-position three-way solenoid directional valves, and the second solenoid directional valve 106 is a two-position five-way solenoid directional valve.

[0038] Please refer to Figure 4All components are in their initial working state. All solenoid directional valves are in the spring chamber reset state, the booster cylinder is in the retracted state, the spring chamber of the control valve core under test is in the reset state, and the guide pin of the bypass valve 2 is in the P2 position. At this time, the spring 7 is in the pre-compressed state.

[0039] Please refer to Figure 1-4 The present invention discloses a method for testing the control valve core of an oil drilling reamer, which utilizes the aforementioned oil drilling reamer control valve core testing device and includes the following steps:

[0040] Step 1: Use plug 113 to block the inner hole of bypass valve piston 2 at the left end face of the bypass valve piston 2 of the control valve core to ensure that there is no leakage at the plug.

[0041] Step 2: Install the sealing end cover flange 114 at the end of the bypass valve piston 2, so that the exhaust port is located at the top of its outer circle, and open the exhaust port plug 115 at the top of the sealing end cover flange 114.

[0042] Step 3: Open the first electromagnetic reversing valve 101 to allow low-pressure water to enter the liquid chamber 109 of the gas-liquid conversion booster cylinder 103 from the water tank 107 through the first one-way valve 104, and then enter the cavity D formed between the control valve core and the sealing end cover flange 114 through the second one-way valve 105.

[0043] Step 4: When the low-pressure water fills the cavity D and the liquid chamber 109, plug the vent plug 115 and open the second electromagnetic reversing valve 106. By controlling the second electromagnetic reversing valve 106, the piston in the gas-liquid conversion booster cylinder 103 pressurizes the low-pressure water in the liquid chamber 109 and flows into the cavity D, thereby pushing the bypass valve piston 2 of the control valve core to move from left to right and compress the spring 7 in the control valve core.

[0044] Step 5: When the piston of the gas-liquid conversion booster cylinder 103 reaches the lowest end, the second electromagnetic reversing valve 106 is reversed so that the piston moves upward, thereby generating a negative pressure in the liquid chamber 109, and using this negative pressure to draw in the low-pressure water in the water tank 107 and fill the liquid chamber 109.

[0045] Step 6: The second electromagnetic reversing valve 106 is reversed, causing the piston in the gas-liquid conversion booster cylinder 103 to pressurize the low-pressure water in the liquid chamber 109 and flow into the mold cavity D, and push the bypass valve piston 2 to continue to move to the right to compress the spring 7.

[0046] Step 7, repeat steps 5 and 6 until the bypass valve piston 2 moves to the rightmost bottom working position, so as to control the guide pin 9 of the control valve core to switch between different positions, thereby realizing the working mode conversion of the control valve core;

[0047] Step 8: Based on the pressure displayed on pressure gauge 108 during the working mode conversion process, determine the system pressure change during the compression process of the control valve core to simulate the actual mud flow state during the operation of the entire oil drilling reamer.

[0048] Preferably, it further includes: switching the third electromagnetic reversing valve 112 to open the bypass pressure relief water passage so that the high-pressure water in the cavity D can be unloaded and flow into the water tank 107 through the third electromagnetic reversing valve 112.

[0049] Because of the above technical solution, this invention can conduct a special pressure test on the maximum force required for the working mode conversion of the control valve core. This invention can directly use the existing air source (or air machine) in the workshop to form a pressurization system, increase the water pressure in the water tank to the required pressure, push the bypass valve piston to move, and complete the working mode conversion. This can simulate the actual flow state of mud when the tool is working, and can directly read the system pressure change during the valve core compression process. The measurement data is relatively realistic.

[0050] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A petroleum drilling reamer control valve spool testing apparatus, characterized by, include: The system includes a first solenoid directional valve (101), an air compressor (102), a gas-liquid conversion booster cylinder (103), a first check valve (104), a second check valve (105), a second solenoid directional valve (106), a water tank (107), and a pressure gauge (108). The liquid chamber (109) of the gas-liquid conversion booster cylinder (103) is connected to the water tank (107) in sequence through the first check valve (104) and the first solenoid directional valve (101). The liquid chamber (109) of the liquid-liquid conversion booster cylinder (103) is connected to the mud input end of the control valve core under test through the second check valve (105). The rodless gas chamber (110) and the rod gas chamber (111) of the gas-liquid conversion booster cylinder (103) are connected to the air compressor (102) through the second solenoid directional valve (106). The pressure gauge (108) is installed on the connecting pipeline between the second check valve (105) and the control valve core.

2. The petroleum drilling reamer control valve spool testing device of claim 1, wherein, The connecting pipeline between the second one-way valve (105) and the control valve core is connected to the water tank (107) through the third electromagnetic reversing valve (112).

3. The petroleum drilling reamer control valve spool testing device of claim 2, wherein, The first electromagnetic directional valve (101) and the third electromagnetic directional valve (112) are two-position three-way electromagnetic directional valves, and the second electromagnetic directional valve (106) is a two-position five-way electromagnetic directional valve.

4. A method of testing a control valve spool of a petroleum drilling reamer tool, the method comprising: The oil drilling reamer control valve core testing device according to any one of claims 1-3 includes the following steps: Step 1: Use a plug (113) to block the inner hole of the bypass valve piston (2) at the left end face of the control valve core to ensure that there is no leakage at the plug. Step 2: Install the sealing end cover flange (114) on the end of the bypass valve piston (2) so that the exhaust port is located at the top of its outer circle, and open the exhaust port plug (115) on the top of the sealing end cover flange (114). Step 3: Open the first electromagnetic reversing valve (101) to allow low-pressure water to enter the liquid chamber (109) of the gas-liquid conversion booster cylinder (103) from the water tank (107) through the first check valve (104), and then enter the cavity D formed between the control valve core and the sealing end cover flange (114) through the second check valve (105). Step 4: When the low-pressure water fills the cavity D and the liquid chamber (109), plug the vent plug (115), open the second electromagnetic reversing valve (106), and control the piston in the gas-liquid conversion booster cylinder (103) to pressurize the low-pressure water in the liquid chamber (109) and let it flow into the cavity D, thereby pushing the bypass valve piston (2) of the control valve core to move from left to right to compress the spring (7) in the control valve core; Step 5: When the piston of the gas-liquid conversion booster cylinder (103) reaches the lowest end, the second electromagnetic reversing valve (106) is reversed so that the piston moves upward, thereby generating a negative pressure in the liquid chamber (109), and using this negative pressure to draw in the low-pressure water in the water tank (107) and fill the liquid chamber (109). Step 6: The second electromagnetic reversing valve (106) is reversed, so that the piston in the gas-liquid conversion booster cylinder (103) pressurizes the low-pressure water in the liquid chamber (109) and flows into the mold cavity D, and pushes the bypass valve piston (2) to continue to move to the right to compress the spring (7). Step 7, repeat steps 5 and 6 until the bypass valve piston (2) runs to the rightmost bottom working position to control the guide pin (9) of the control valve core to switch between different positions, thereby realizing the working mode conversion of the control valve core; Step 8: Based on the pressure displayed on the pressure gauge (108) during the working mode conversion process, determine the system pressure change during the compression process of the control valve core to simulate the actual mud flow state during the operation of the entire oil drilling reamer.

5. The method of claim 4, wherein: Also includes: The third electromagnetic reversing valve (112) is reversed, thereby opening the bypass pressure relief water passage so that the high-pressure water in the cavity D is unloaded and flows into the water tank (107) through the third electromagnetic reversing valve (112).

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