Drilling pump electric control safety valve device and control method thereof

Abstract

The invention discloses a drilling pump electric control safety valve device which comprises a valve body assembly, the valve body assembly is provided with an inlet end and an outlet end, the inlet end is provided with an inlet flange, the inlet flange is installed on a drilling pump discharge manifold through a bolt, the outlet end is connected with a discharge flange through a bolt, and a valve seat and a piston rod assembly are installed in the valve body assembly. A piston rod assembly penetrates through the valve body assembly to make contact with the guide rail, a pressure sensor is arranged at the right end of an inlet flange and connected with an electric cabinet system, a supporting frame is arranged at the top of the valve body assembly, and a linear driver is fixed to the supporting frame. The linear driver is connected with the electric cabinet system through a cable, and the linear driver is connected with the guide rail through a coupler and a pin shaft. According to the drilling pump electric control safety valve device and the control method thereof, the problem that an existing safety valve of a pure mechanical structure is large in blowout pressure error is solved, the control precision is higher, and the system response is faster.

Description

Technical Field

[0001] The present invention relates to the technical field of safety protection and warning devices for oil drilling pumps, specifically to an electronically controlled safety valve device for drilling pumps. The present invention also relates to a control method for the electronically controlled safety valve device of a drilling pump. Background Art

[0002] The safety valve of a drilling pump is an important component to ensure the safe operation of the drilling pump. When the pump pressure of the drilling pump exceeds the set blowout pressure, the safety valve opens, and a part of the gas and fluid in the drilling pump are discharged from the pipeline, achieving the purpose of reducing the pressure of the system and ensuring that the system does not have an accident due to excessive pressure.

[0003] At present, the safety valves used in drilling pumps at oilfield sites mainly include two types: shear pin safety valves and spring safety valves.

[0004] Most of the safety valves supporting the drilling pumps of land rigs are shear pin safety valves. Its working principle is: when the drilling pump is working, the pressure of the discharged mud acts on the piston rod through the inlet flange, causing the piston rod to move upward. The shear pin plate is fixed to the valve body through a shear pin, restricting the movement of the piston rod. When the discharge pressure is greater than the pressure value corresponding to the hole into which the shear pin is inserted, the shear pin is cut off, the shear pin plate rotates around the rotary pin shaft, the piston rod moves upward, the safety valve opens, and the mud is discharged to the mud tank through the discharge flange and the discharge pipe.

[0005] The shear pin safety valve has a simple structure, low price, and low maintenance cost. However, affected by processing quality, shear pin strength, part wear, etc., there are situations of early or late blowout, and the blowout pressure error is relatively large; the shear pin is a disposable part and must be replaced after being cut off. Therefore, the shear pin safety valve has certain deficiencies in terms of operability, maintainability, reliability, and safety.

[0006] The spring return safety valve is mainly used for supporting marine drilling pumps. The working principle of the spring return safety valve: when the drilling pump is working, the discharged mud acts on the piston rod. The piston rod is connected to the compression spring through a crank connecting rod mechanism and a spoon-shaped lever mechanism. When the force transmitted to the compression spring is greater than the pre-tightening force of the spring, the spring is compressed, the dead point position of the crank connecting rod mechanism is destroyed, the piston rod moves upward, and the mud is discharged to the discharge manifold through the discharge hole on the piston rod until it reaches the mud tank (pond). By rotating the nut on the valve body, the compression amount of the spring can be adjusted, and referring to different pressure values on the scale, the required discharge pressure value can be set. When resetting, rotate the reset handle to restore the crank connecting rod mechanism to the dead point position, and the piston rod moves downward, cutting off the flow path.

[0007] The spring reset safety valve has a higher accuracy than the shear pin safety valve, but its overall structure is complex, and the pressure error is large after the parts are worn; the shapes and dimensions of the spring, connecting rod mechanism, piston rod, etc. have high processing requirements, are difficult to manufacture, expensive, and have high maintenance costs. Summary of the Invention

[0008] The first object of the present invention is to provide an electronically controlled safety valve device for a drilling pump, which solves the problem of large blowout pressure error of the existing safety valve with a pure mechanical structure.

[0009] The second object of the present invention is to provide a control method for the electronically controlled safety valve device of the drilling pump, which has higher control accuracy and faster system response for the safety valve.

[0010] The first technical solution adopted by the present invention is: an electronically controlled safety valve device for a drilling pump, including a valve body assembly. The valve body assembly is provided with an inlet end and an outlet end. The inlet end is provided with an inlet flange, and the inlet flange is installed on the discharge manifold of the drilling pump through bolts. The outlet end is connected with a discharge flange through bolts. A valve seat and a piston rod assembly are installed inside the valve body assembly. A guide rail seat is installed on the top of the valve body assembly, and an antifriction plate and a guide rail are installed inside the guide rail seat. The piston rod assembly passes through the valve body assembly and contacts the guide rail. There is a pressure sensor at the right end of the inlet flange, and the pressure sensor is connected to the electronic control box system. A support frame is provided on the top of the valve body assembly, and a linear driver is fixed on the support frame. The linear driver is connected to the electronic control box system through a cable. The linear driver is connected to the guide rail through a coupling and a pin shaft.

[0011] The characteristics of the first technical solution adopted by the present invention also lie in:

[0012] A threaded compression sleeve is arranged on the valve seat, and the threaded compression sleeve is connected to the valve body assembly through threads.

[0013] The piston rod assembly includes a piston rod, a gland, and a piston rod bushing. Both the inside and outside of the piston rod adopt a stepped structure. A through hole is opened at the outer end of the piston rod, which penetrates the upper and lower cavities of the valve body assembly. The gland is connected to the piston rod through threads. The piston rod bushing has a guiding effect on the piston rod, and seals for the piston rod and the valve body assembly are provided at the end press and inside of the piston rod.

[0014] A connecting seat is arranged between the piston rod bushing and the guide rail, and the connecting seat is installed on the valve body assembly.

[0015] The linear driver can be replaced by a rotary driver.

[0016] A protective cover is arranged outside the guide rail seat.

[0017] The electronic control box system includes a power supply. The power supply is connected with a main control module, and the main control module is connected with a display module, a drive module, and an alarm module through cables.

[0018] The second technical solution adopted by the present invention is: a control method for an electronically controlled safety valve device of a drilling pump, which is implemented based on the above-mentioned electronically controlled safety valve device of the drilling pump. The specific control process is as follows:

[0019] Step 1: The mud pressure is collected by a pressure sensor, and the pressure data is transmitted back to the main control module of the electronic control box system;

[0020] Step 2: The main control module determines whether to perform a pressure relief operation according to the pre-set pressure value, and outputs an electrical signal to the display module, the alarm module, and the drive module;

[0021] Step 3: The display module visually displays the pressure data. The alarm module decides whether to issue an alarm instruction according to the electrical signal, and the drive module decides whether to drive the linear drive to push and pull the guide rail to achieve the pressure relief operation according to the electrical signal.

[0022] The beneficial effects of the present invention are:

[0023] The electronically controlled safety valve device of the drilling pump provided by the present invention changes from traditional mechanical control to electronically controlled safety valve pressure relief. The electronically controlled safety valve collects the mud pressure by a pressure sensor, transmits an electrical signal to the internal control system of the electronic control box, and according to the pre-set pressure value, the control system issues an alarm instruction and drives the electric cylinder to push and pull the guide rail to achieve pressure relief. Compared with the shear pin safety valve relying on the strength of the shear pin and the reset safety valve based on the elasticity of the spring, the electrical signal transmission is faster and more accurate. The electronically controlled safety valve can adjust the pressure steplessly, has an audible and visual alarm function, higher accuracy, faster system response, reduces the labor intensity and safety risks of operators, and has higher operability, maintenance-free, safety and reliability. Description of the Drawings

[0024] Figure 1 is a schematic structural diagram of the electronically controlled safety valve device of the drilling pump of the present invention;

[0025] Figure 2 is a control system block diagram of the electronic control box of the electronically controlled safety valve device of the drilling pump of the present invention;

[0026] Figure 3 is a schematic structural diagram of the piston rod assembly of the present invention;

[0027] Figure 4 is a schematic structural diagram of the electronic control box system of the present invention;

[0028] Figure 5 is a schematic diagram of connection method B of the electronically controlled safety valve device of the drilling pump of the present invention;

[0029] Figure 6 is a schematic diagram of connection method C of the electronically controlled safety valve device of the drilling pump of the present invention.

[0030] In the figure: 1. Inlet flange, 2. Valve body assembly, 3. Pressure sensor, 4. Threaded bushing, 5. Valve seat, 6. Piston rod assembly, 601. Piston rod, 602. gland, 603. Piston rod adapter;

[0031] 7. Connecting seat, 8. Protective sleeve, 9. Anti-friction plate, 10. Guide rail, 11. Coupling, 12. Pin shaft, 13. Linear actuator, 14. Support frame, 15. Electric control box system, 151. Power supply, 152. Main control module, 153. Display module, 154. Drive module, 155. Alarm module, 156. Cable;

[0032] 16. Discharge flange, 17. Bolt, 18. Guide rail seat. Specific implementation mode

[0033] The present invention will be described in detail below in conjunction with the accompanying drawings and specific implementation modes.

[0034] The present invention discloses an electronically controlled safety valve device for a drilling pump, as Figure 1 shown, the electronically controlled safety valve device for a drilling pump includes a valve body assembly 2. The valve body assembly 2 is provided with an inlet end and an outlet end. The inlet end is provided with an inlet flange 1. The inlet flange 1 is installed on the discharge manifold of the drilling pump through bolts. The outlet end is connected to a discharge flange 16 through bolts 17. A valve seat 5 and a piston rod assembly 6 are installed inside the valve body assembly 2. A threaded bushing 4 is arranged on the valve seat 5. The threaded bushing 4 is connected to the valve body assembly 2 through threads, as Figure 3 shown, the piston rod assembly 6 includes a piston rod 601, a gland 602 and a piston rod adapter 603. Both the inside and outside of the piston rod 601 adopt a stepped structure. A through hole is opened at the outer end of the piston rod 601, which penetrates the upper and lower cavities of the valve body assembly 2. The gland 602 is threadedly connected to the piston rod 601. The piston rod adapter 603 guides the piston rod. Seals for the piston rod 601 and the valve body assembly 2 are provided at the end press and inside of the piston rod 601. A connecting seat 7 is arranged between the piston rod adapter 603 and the guide rail 10. The connecting seat 7 is installed on the valve body assembly 2.

[0035] A guide rail seat 18 is installed on the top of the valve body assembly 2. A protective sleeve 8 is arranged outside the guide rail seat 18. An anti-friction plate 9 and a guide rail 10 are installed inside the guide rail seat 18. The piston rod assembly 6 passes through the valve body assembly 2 and contacts the guide rail 10. A pressure sensor 3 is provided at the right end of the inlet flange 1. The pressure sensor 3 is connected to the electric control box system 15. A support frame 14 is provided at the top of the valve body assembly 2. A linear actuator 13 is fixed on the support frame 14. The linear actuator 13 is connected to the electric control box system 15 through a cable. The linear actuator 13 is connected to the guide rail 10 through a coupling 11 and a pin shaft 12.

[0036] As Figure 4As shown, the electric control box system 15 includes a power supply 151, a main control module 152, a display module 153, a drive module 154, and an alarm module 155. Each module is connected by a cable 156.

[0037] The linear drive 13 can be replaced with a rotary drive.

[0038] The present invention also discloses a control method for the above-mentioned electric control safety valve device of a drilling pump. The specific control process is as follows:

[0039] Step 1: The pressure sensor 3 collects the mud pressure and transmits the pressure data back to the main control module 152 of the electric control box system 15.

[0040] Step 2: The main control module 152 determines whether to perform a pressure relief operation according to a preset pressure value and outputs an electrical signal to the display module 153, the alarm module 155, and the drive module 154.

[0041] Step 3: The display module 153 visually displays the pressure data. The alarm module 155 decides whether to issue an alarm instruction according to the electrical signal. The drive module 154 decides whether to drive the linear drive 13 to push and pull the guide rail 10 to achieve the pressure relief operation according to the electrical signal.

[0042] Embodiment 1

[0043] The present invention discloses an electric control safety valve device for a drilling pump. As Figure 1 shown, the electric control safety valve device for a drilling pump includes a valve body assembly 2. The valve body assembly 2 is provided with an inlet end and an outlet end. The inlet end is provided with an inlet flange 1, and the inlet flange 1 is installed on the discharge manifold of the drilling pump through bolts. The outlet end is connected with a discharge flange 16 through a bolt 17. A valve seat 5 and a piston rod assembly 6 are installed in the valve body assembly 2. A threaded bushing 4 is arranged on the valve seat 5, and the threaded bushing 4 is connected with the valve body assembly 2 through threads. As Figure 3 shown, the piston rod assembly 6 includes a piston rod 601, a gland 602, and a piston rod adapter 603. Both the inside and outside of the piston rod 601 adopt a stepped structure. A through hole is opened at the outer end of the piston rod 601, which penetrates the upper and lower cavities of the valve body assembly 2. The gland 602 is connected with the piston rod 601 through threads. The piston rod adapter 603 guides the piston rod. Seals for the piston rod 601 and the valve body assembly 2 are provided at the end and inside of the piston rod 601. A connecting seat 7 is arranged between the piston rod adapter 603 and the guide rail 10, and the connecting seat 7 is installed on the valve body assembly 2.

[0044] At the top of the valve body assembly 2, a guide rail seat 18 is installed. A protective sleeve 8 is arranged outside the guide rail seat 18. A friction reducing plate 9 and a guide rail 10 are installed inside the guide rail seat 18. The piston rod assembly 6 passes through the valve body assembly 2 and contacts the guide rail 10. At the right end of the inlet flange 1, there is a pressure sensor 3, and the pressure sensor 3 is connected to the electric control box system 15. At the top of the valve body assembly 2, there is a support frame 14, and a linear actuator 13 is fixed on the support frame 14. The linear actuator 13 is connected to the electric control box system 15 through a cable. The linear actuator 13 is connected to the guide rail 10 through a coupling 11 and a pin shaft 12.

[0045] As Figure 4 shown, the electric control box system 15 includes a power supply 151, a main control module 152, a display module 153, a drive module 154, and an alarm module 155. Each module is connected through a cable 156.

[0046] The present invention also discloses a control method for the above-mentioned electric control safety valve device of the drilling pump. The specific control process is as follows:

[0047] Step 1: The pressure sensor 3 collects the mud pressure and transmits the pressure data back to the main control module 152 of the electric control box system 15.

[0048] Step 2: The main control module 152 determines whether to perform a pressure relief operation according to the pre-set pressure value and outputs an electric signal to the display module 153, the alarm module 155, and the drive module 154.

[0049] Step 3: The display module 153 visually displays the pressure data. The alarm module 155 decides whether to issue an alarm instruction according to the electric signal. The drive module 154 decides whether to drive the linear actuator 13 to push and pull the guide rail 10 to achieve the pressure relief operation according to the electric signal.

[0050] Embodiment 2

[0051] In this embodiment, the safety valve is connected to the discharge end of the drilling pump through the inlet flange 1, and the mud is discharged through the discharge flange 16 and the welding neck flange, as Figure 5 shown; the remaining structures and control methods are the same as those in Embodiment 1.

[0052] Embodiment 3

[0053] In this embodiment, the safety valve is connected to the discharge end of the drilling pump through the inlet union assembly, and the mud is discharged through the outlet union assembly, as Figure 6 shown; the remaining structures and control methods are the same as those in Embodiment 1.

[0054] Embodiment 4

[0055] In this embodiment, the valve seat 5 adopts an extended valve seat, which can replace the threaded compression sleeve 4; the remaining structures and control methods are the same as those in Embodiment 1.

[0056] Example 5

[0057] In this example, the piston rod 601 in the piston rod assembly 6 has a solid structure, eliminating the purpose of reducing the load on the piston rod and simplifying the processing of the piston rod; the remaining structures and control methods are the same as those in Example 1.

[0058] Example 6

[0059] In this example, the piston is guided by other means such as the cooperation between the valve body assembly 2 and the piston rod and adding a buffer pad, replacing the piston rod adapter 603, and at the same time omitting the connecting seat 7, simplifying the piston rod assembly 6 and the valve body assembly 2; the remaining structures and control methods are the same as those in Example 1.

[0060] Example 7

[0061] In this example, the antifriction plate 9 is made of copper alloy to reduce the friction force of the guide rail 10; the remaining structures and control methods are the same as those in Example 1.

[0062] Example 8

[0063] In this example, the linear actuator 13 is replaced with a rotary actuator to make the guide rail 10 perform a rotary motion, which can play a similar limiting role on the piston rod assembly 6; the remaining structures and control methods are the same as those in Example 1.

[0064] Example 9

[0065] In this example, the guide rail 10 and the linear actuator 13 can be connected by other means such as threads; the remaining structures and control methods are the same as those in Example 1.

[0066] The working principle of the electric control safety valve device of the drilling pump of the present invention is as follows:

[0067] The electric control safety valve collects the mud pressure by the pressure sensor 3, transmits the electrical signal to the internal control system of the electric control box 15. The main control module 152 determines whether to perform a pressure relief operation according to the preset pressure value, and outputs an electrical signal to the display module 153, the alarm module 155 and the drive module 154. When the collected pressure value reaches the preset pressure value, the control system issues an alarm command and drives the linear actuator 13 to push and pull the guide rail 10. The piston rod assembly 6 moves upward under the mud pressure to form a passage, and the high-pressure mud flows into the manifold to achieve pressure relief.

[0068] The electric control box system 15 of the present invention also has the following characteristics:

[0069] 1) The pressure sensor is a special mud pressure transmitter.

[0070] 2) The input power supply is AC 220V / 50Hz alternating current, which is then converted into a DC 24V system power supply by the power supply module to supply power to each component of the system.

[0071] 3) The switch buttons are explosion-proof push-button switches, namely: "Reset", "Forced pressure relief", "Audible and visual alarm", "Settings", "+". The switch buttons are used for parameter setting of the system and operation control function of the system.

[0072] 4) The linear actuator is an electric cylinder driven by a DC motor. The cylinder body is made of stainless steel and aluminum alloy to meet the working conditions of the oil field. Its function is to push / pull the guide rail of the safety valve.

[0073] 5) The display module of the control box uses an LED digital tube for active high-brightness display, which is resistant to high and low temperature environments.

[0074] 6) The main control module selects a single-chip microcomputer as the main core, and is then equipped with a high-precision AD processing chip, a motor control chip for high-current drive and industrial-grade electronic components to form the entire control circuit system. Its function is to process the pressure signal of the sensor, calculate and drive the motor control circuit to make the electric cylinder complete the telescopic movement, open the safety valve according to the set pressure, or forcibly open the safety valve; when the piston of the safety valve is installed in place, manually press the reset button for reset operation.

[0075] 7) It has an overpressure audible and visual alarm function.

[0076] In this embodiment, the main control module selects a single-chip microcomputer as the main core, and is equipped with a high-precision AD processing chip, a motor control chip for high-current drive and industrial-grade electronic components to form the entire control circuit system. In one embodiment, a PLC controller is used as the main control module to monitor and process the signals transmitted by the pressure sensor.

[0077] In this embodiment, the drive module drives the linear actuator to push / pull the guide rail to open and close the safety valve. In one embodiment, the drive module controls a pneumatic device or a hydraulic device to open and close the safety valve.

[0078] In this embodiment, the display module of the control box uses an LED digital tube for active high-brightness display, which is resistant to high and low temperature environments. In one embodiment, the display device can use other electronic devices related to imaging.

[0079] The above is the specific embodiment of the present invention. It should be noted that for those skilled in the art of this technology, without departing from the principle of the present invention, various changes and modifications can be made, and these changes and modifications should also be regarded as the protection scope of the present invention.

Claims

1. Electric control safety valve device for drilling pump, Characterized in that, It includes a valve body assembly (2). The valve body assembly (2) is provided with an inlet end and an outlet end. The inlet end is provided with an inlet flange (1). The inlet flange (1) is installed on the discharge manifold of the drilling pump through bolts. The outlet end is connected with a discharge flange (16) through bolts (17). A valve seat (5) and a piston rod assembly (6) are installed inside the valve body assembly (2). A guide rail seat (18) is installed on the top of the valve body assembly (2). A friction reducing plate (9) and a guide rail (10) are installed inside the guide rail seat (18). The piston rod assembly (6) passes through the valve body assembly (2) and contacts the guide rail (10). There is a pressure sensor (3) at the right end of the inlet flange (1). The pressure sensor (3) is connected with an electric control box system (15). A support frame (14) is provided on the top of the valve body assembly (2). A linear actuator (13) is fixed on the support frame (14). The linear actuator (13) is connected with the electric control box system (15) through a cable. The linear actuator (13) is connected with the guide rail (10) through a coupling (11) and a pin shaft (12).

2. The electric control safety valve device for drilling pump according to claim 1, Characterized in that, A threaded compression sleeve (4) is arranged on the valve seat (5). The threaded compression sleeve (4) is connected with the valve body assembly (2) through threads.

3. The electric control safety valve device for drilling pump according to claim 1, Characterized in that, The piston rod assembly (6) includes a piston rod (601), a gland (602) and a piston rod bushing (603). The inner and outer parts of the piston rod (601) both adopt a stepped structure. A through hole is opened at the outer end of the piston rod (601), penetrating the upper and lower cavities of the valve body assembly (2). The gland (602) is connected with the piston rod (601) through threads. The piston rod bushing (603) has a guiding effect on the piston rod. Seals for the piston rod (601) and the valve body assembly (2) are arranged at the end press and inside of the piston rod (601).

4. The electric control safety valve device for drilling pump according to claim 3, Characterized in that, A connecting seat (7) is arranged between the piston rod bushing (603) and the guide rail (10). The connecting seat (7) is installed on the valve body assembly (2).

5. The electric control safety valve device for drilling pump according to claim 1, Characterized in that, The linear actuator (13) can be replaced by a rotary actuator.

6. The electric control safety valve device for drilling pump according to claim 1, Characterized in that, A protective sleeve (8) is arranged outside the guide rail seat (18).

7. The electric control safety valve device for drilling pump according to claim 1, Characterized in that, The electric control box system (15) includes a power supply (151). The power supply (151) is connected with a main control module (152). The main control module (152) is connected with a display module (153), a drive module (154) and an alarm module (155) through a cable (156).

8. Control method for the electric control safety valve device of the drilling pump, Characterized in that, Implement the electric control safety valve device of the drilling pump according to claim 7, and the specific control process is as follows: Step 1: The mud pressure is collected by the pressure sensor (3), and the pressure data is transmitted back to the main control module (152) of the electric control box system (15); Step 2: The main control module (152) determines whether to perform a pressure relief operation according to the preset pressure value, and outputs an electrical signal to the display module (153), the alarm module (155) and the drive module (154); Step 3: The display module (153) visually displays the pressure data, the alarm module (155) decides whether to issue an instruction alarm according to the electrical signal, and the drive module (154) decides whether to drive the linear driver (13) to push and pull the guide rail (10) to implement the pressure relief operation.

Images