Drilling pump pressure protection system

Abstract

A kind of drilling pump pressure protection system, including signal acquisition unit and control unit, by high pressure valve, low pressure backflow valve and tee pipe constitute pump pressure protection gate group, one end of tee pipe water inlet is connected with the water outlet of drilling pump, other two ends one end connects high pressure valve, one end connects low pressure backflow valve, the high pressure valve uses electric valve or pneumatic valve, low pressure backflow valve uses pneumatic valve, the switch control relay of electric valve or the switch control solenoid valve of pneumatic valve is controlledly connected in control unit;The limit switch output signal of electric valve or pneumatic valve is connected control unit;Signal acquisition unit uses pressure sensor to be installed on the water pipeline of high pressure valve or drilling pump, pressure sensor output signal connects control unit;The control unit monitors the mud pressure on the water pipeline of high pressure valve or drilling pump in real time, controls high pressure valve and low pressure backflow valve to open or close, uses pump pressure protection solenoid valve or pump pressure protection relay to carry out intervening pump pressure protection control to drilling pump.

Description

Drilling pump pressure protection system Technical Field

[0001] This invention relates to safety control technology for oil drilling engineering, and in particular to pump pressure protection for drilling pumps. Background Technology

[0002] With the continuous innovation of oil extraction technology and the development of new drilling and well workover processes and technologies, the requirements for the functionality, economy, and safety of drilling pumps, which are the "heart" of drilling rigs, are becoming increasingly stringent. As a key piece of equipment in the drilling fluid circulation system, the technical performance and safety of the drilling pump gate assembly directly affect the effective functioning of the drilling pump.

[0003] Currently, each drilling pump gate assembly, both domestically and internationally, includes one high-pressure valve and one low-pressure valve. The opening and closing of these valves still relies on manual operation, which is time-consuming, labor-intensive, inefficient, and inherently risky. Errors in communication between personnel often lead to misoperation when opening and closing these valves. Such misoperations can cause minor equipment damage, or even serious accidents resulting in equipment failure or personal injury. Furthermore, as high-pressure equipment, drilling pumps still rely on outdated shear-type safety valves for pressure protection. These valves have only 5-6 protection levels, have an error margin of ±10%, and require considerable time to resume drilling after the safety pin has sheared. These drawbacks severely hinder improvements in drilling technology and safety. For example, during directional drilling, horizontal drilling, or sidetracking in complex formations, pump jamming can easily cause the safety valve to open, leading to pump stoppage. If the drilling pump cannot be quickly restarted, drilling fluid circulation cannot be established downhole, potentially causing wellbore narrowing or collapse, resulting in stuck pipe accidents. When the pump pressure of a drilling pump rises instantaneously above the protection level, if the safety pin is not sheared in time, it can easily cause equipment damage or even casualties.

[0004] The applicant's previous invention patent, 201811049380.2, proposed a method to prevent drilling pump malfunction in oil drilling engineering. This method involves installing a pressure sensor on both the drilling pump and the riser, and determining whether a drilling pump malfunction has occurred by comparing the difference between the riser pressure and the drilling pump pressure. However, this method has certain limitations in practical applications. First, the system may misjudge when the riser or pump pressure sensor is damaged. Second, it fails to address the issue of automatic start / stop of high-pressure valves. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention proposes a pump pressure protection system. This system uses a pump pressure protection gate assembly and a control unit to open or close the high-pressure valve and the low-pressure return valve. Simultaneously, the control unit monitors the mud pressure on the electric valve or the water outlet pipeline of the drilling pump in real time, and the execution unit controls the drilling pump for interventional pump pressure protection.

[0006] This invention achieves automated control of the start and stop of high and low pressure gates of drilling pumps and dual protection control in case of excessive mud pressure, which can effectively prevent pump pressure from exceeding the limit and pump stalling accidents caused by misjudgment or misoperation.

[0007] The technical solution adopted in this invention is as follows:

[0008] A drilling pump pressure protection system includes a high-pressure valve, a low-pressure return valve, a signal acquisition unit, and a control unit. The outlet pipe of the high-pressure valve is connected to the drilling high-pressure pipeline, and the outlet pipe of the low-pressure return valve is connected to the mud tank return pipeline. A pump pressure protection gate assembly is formed by the high-pressure valve, the low-pressure return valve, and a three-way pipe. One end of the inlet of the three-way pipe is connected to the outlet of the drilling pump, and the other two ends of the three-way pipe are connected to the high-pressure valve at one end and the low-pressure return valve at the other end. The high-pressure valve is an electric valve or a pneumatic valve, and the low-pressure valve is a pneumatic valve. The electric valve is controlled by a relay, and the pneumatic valve is controlled by a relay. The solenoid valve is controlled and connected to the control unit; the limit switch output signal of the electric valve or pneumatic valve is connected to the control unit; the signal acquisition unit uses a pressure sensor installed on the outlet pipeline of the high-pressure valve or drilling pump, and the pressure sensor output signal is connected to the control unit; the control unit monitors the mud pressure on the outlet pipeline of the high-pressure valve or drilling pump in real time, and controls the high-pressure valve and low-pressure return valve to open or close according to the following control logic; the execution unit uses a pump pressure protection solenoid valve or pump pressure protection relay to perform interventional pump pressure protection control on the drilling pump:

[0009] When the high-pressure valve is open, the low-pressure return valve is closed; when the high-pressure valve is closed, the low-pressure return valve is open.

[0010] 2) When the high-pressure valve is open and the low-pressure return valve is closed, if the mud pressure on the outlet pipeline of the high-pressure valve or drilling pump is greater than the set value N, N>0, then the pump pressure protection solenoid valve connected in series in the mechanical pump control air circuit will be closed to stop the drilling pump, or the pump pressure protection relay connected in series in the electric pump control circuit will be disconnected to stop the drilling pump, or the low-pressure return valve connected to the mud tank return will be opened to release pressure.

[0011] In step 2), if the mud pressure on the outlet pipeline of the high-pressure valve or drilling pump is greater than the set value N, close the solenoid valve connected in series in the mechanical pump control air circuit or disconnect the relay connected in series in the electric pump control circuit to stop the pump; if the mud pressure on the outlet pipeline of the high-pressure valve or drilling pump is greater than the set value M, and M>N, open the low-pressure return valve connected to the mud tank return to release pressure.

[0012] The control unit employs an industrial computer and a PLC, with the PLC connected to the industrial computer via a serial port. The pressure sensor output signal is connected to the PLC of the control unit via an AD module. For the execution unit, the pump pressure protection solenoid valve is connected in series in the control air circuit of the mechanical drilling pump for mechanical drilling pumps; for the electric drilling pump, the pump pressure protection relay is connected in series in the control circuit of the electric drilling pump, and the pump pressure protection solenoid valve or pump pressure protection relay is controlled and connected to the PLC of the control unit.

[0013] The aforementioned drilling pump pressure protection system, for drilling systems containing two or more drilling pumps, includes a pump pressure protection gate group for each drilling pump. The inlet of the tee pipe of the pump pressure protection gate group is connected to the outlet of the corresponding drilling pump. The outlet pipe of the high-pressure valve is connected to the drilling high-pressure pipeline, and the outlet pipe of the low-pressure return valve is connected to the mud tank. The switching control relay of the electric valve or the switching control solenoid valve of the pneumatic valve is connected to the control unit. The limit switch output signal of the electric valve or pneumatic valve is connected to the control unit.

[0014] The control unit monitors the mud pressure on the outlet pipeline of the electric valve or drilling pump in real time, and controls the high-pressure valve and low-pressure return valve to open or close according to the following control logic. The execution unit uses a number of pump pressure protection solenoid valves or pump pressure protection relays corresponding to the drilling pump to perform intervention-type pump pressure protection control on the corresponding drilling pump: (1) In the same pump pressure protection gate group, when the high-pressure valve is open, the low-pressure return valve is closed; when the high-pressure valve is closed, the low-pressure return valve is open.

[0015] (2) In any pump pressure protection gate group, when the high pressure valve is open and the low pressure return valve is closed, if the mud pressure on the outlet pipeline of the high pressure valve or the drilling pump is greater than the set value N, N>0, then the pump pressure protection solenoid valve connected in series in the mechanical pump control air circuit is closed to stop the drilling pump or the pump pressure protection relay connected in series in the electric pump control circuit is disconnected to stop the drilling pump; or, the low pressure return valve connected to the mud tank return is opened to release pressure.

[0016] A drilling pump pressure protection system includes a high-pressure valve, a low-pressure return valve, a signal acquisition unit, and a control unit. The outlet pipe of the high-pressure valve is connected to the drilling high-pressure pipeline, and the outlet pipe of the low-pressure return valve is connected to the mud tank return pipeline. A pump pressure protection gate assembly is formed by the high-pressure valve, the low-pressure return valve, and a three-way pipe. One end of the inlet of the three-way pipe is connected to the outlet of the drilling pump, and the other two ends of the three-way pipe are connected to the high-pressure valve at one end and the low-pressure return valve at the other end. The high-pressure valve is an electric valve or a pneumatic valve, and the low-pressure return valve is a pneumatic valve. The switching control of the electric valve is a relay or... The pneumatic valve's on / off control solenoid valve is connected to the control unit; the limit switch output signal of the electric valve or pneumatic valve is connected to the control unit; the signal acquisition unit acquires the pressure signal on the outlet pipeline of the high-pressure valve or drilling pump and the electric pump speed setpoint signal, and transmits them to the control unit; the control unit monitors the mud pressure on the outlet pipeline of the high-pressure valve or drilling pump in real time, and controls the high-pressure valve and low-pressure return valve to open or close according to the following control logic, and performs interventional pump pressure protection control of the drilling pump by controlling the electric pump speed setpoint signal through the execution unit:

[0017] (1) When the high-pressure valve is open, the low-pressure return valve is closed; when the high-pressure valve is closed, the low-pressure return valve is open.

[0018] (2) When the high pressure valve is open and the low pressure return valve is closed, if the mud pressure on the outlet pipeline of the high pressure valve or the drilling pump is greater than the set value N, where N>0, a control signal is output to the control device of the electric drilling pump to reduce the speed of the drilling pump, or stop the pump, or open the low pressure return valve connected to the mud tank return to release pressure.

[0019] In step 2), if the mud pressure on the outlet pipeline of the high-pressure valve or drilling pump is greater than the set value N, a control signal is output to the control device of the electric drilling pump to reduce the pump speed. If the mud pressure on the outlet pipeline of the high-pressure valve or drilling pump continues to be greater than the set value N1 (N1>N), a control signal is output to the control device of the electric drilling pump to gradually reduce the pump speed until the pump stops. If the mud pressure on the outlet pipeline of the high-pressure valve or drilling pump is greater than the set value N2, the low-pressure return valve connecting the mud tank for return is opened to release pressure (N2>N1).

[0020] The control unit uses an industrial computer and a PLC. The PLC is connected to the industrial computer via a serial port. The pressure sensor output signal is connected to the PLC of the control unit via an AD module. The electric pump speed setpoint signal is converted by the AD module and then transmitted to the PLC. The execution unit outputs a control signal through the PLC, which is then transmitted to the control device of the electric drilling pump via the DA module to provide interventional pump pressure protection for the drilling pump.

[0021] The aforementioned drilling pump pressure protection system, for drilling systems containing two or more drilling pumps, includes a pump pressure protection gate group for each drilling pump. The inlet of the tee pipe of each pump pressure protection gate group is connected to the outlet of the corresponding drilling pump. The outlet pipe of the high-pressure valve is connected to the drilling high-pressure pipeline, and the outlet pipe of the low-pressure return valve is connected to the mud tank. The electric valve switch control relay and the pneumatic valve switch control solenoid valve of the pump pressure protection gate group are controlled and connected to the control unit. The limit switch output signals of the electric valve and pneumatic valve of each pump pressure protection gate group are connected to the control unit. The signal acquisition unit collects the mud pressure signal on the outlet pipeline of the high-pressure valve or drilling pump and the electric pump speed setpoint signal in real time and transmits them to the control unit. The control unit monitors the mud pressure on the outlet pipeline of the electric valve or drilling pump in real time and controls the high-pressure valve and low-pressure return valve to open or close according to the following control logic. The execution unit controls the electric pump speed setpoint signal to perform interventional pump pressure protection control on the drilling pump:

[0022] (1) When the high-pressure valve is open, the low-pressure return valve is closed; when the high-pressure valve is closed, the low-pressure return valve is open.

[0023] (2) When the high pressure valve is open and the low pressure return valve is closed, if the mud pressure on the outlet pipeline of the high pressure valve or the drilling pump is greater than the set value N, output a control signal to the control device of the electric drilling pump to reduce the speed of the drilling pump, or stop the pump, or open the low pressure return valve connected to the mud tank return to release pressure.

[0024] Beneficial effects of the invention:

[0025] 1. The drilling pump pressure protection system of this invention employs a pump pressure protection gate assembly consisting of an electric valve, a pneumatic valve, and a three-way pipe. Utilizing the high torque and large diameter of the electric valve, it becomes a high-pressure valve after the drilling pump exits water, facilitating the flow of mud within the pipeline. The electric valve can also accurately determine whether the high-pressure valve is closed, ensuring that the mud pump is not misoperated during startup, preventing pump stalling, and ensuring the safety of oil drilling production.

[0026] 2. The drilling pump pressure protection system of the present invention adopts a pump pressure protection gate group consisting of two pneumatic valves and a three-way pipe. Taking advantage of the fast start and fast opening characteristics of the pneumatic valves, it serves as a low-pressure return water valve after the drilling pump discharges water. When the drill bit water hole is blocked or the pump is started with the plug closed, the pneumatic valve can be opened quickly to release pressure, ensuring the safety of oil drilling production.

[0027] 3. The pump pressure protection system of this invention, the control unit is based on the drilling pump pressure protection gate group and the signal acquisition unit, analyzes and judges the working status of the high pressure valve and the low pressure valve as well as the pressure signal of the high pressure pipeline, and performs pump pressure protection through the execution unit. It can effectively prevent pump pressure from exceeding the limit and pump stalling accidents caused by misjudgment and misoperation. At the same time, it realizes the automation of the start and stop of the high and low pressure gates of the drilling pump, solves the problem of automatic start and stop of high pressure valves, and reduces the impact of human factors.

[0028] 4. The pump pressure protection system of this invention achieves dual safety protection for pump pressure by combining an open-close design of electric and pneumatic valves under the action of a control unit, and by comparing and analyzing the changes in upstream and downstream pressure of the drilling mud after water is discharged from the drilling pump, collected by a pressure sensor. This effectively ensures safe production in oil drilling. Furthermore, the implementation scheme is simple, requires no changes to existing pump pressure protection system hardware, is easy to implement, and offers significant social and economic benefits. Attached Figure Description

[0029] Figure 1 shows one of the schematic diagrams of the pump pressure protection system of the present invention;

[0030] Figure 2 shows a second schematic diagram of the pump pressure protection system of the present invention;

[0031] Figure 3 shows the third schematic diagram of the pump pressure protection system of the present invention;

[0032] Figure 4 shows the fourth schematic diagram of the pump pressure protection system of the present invention;

[0033] Figure 5 shows the fifth schematic diagram of the pump pressure protection system of the present invention;

[0034] Figure 6 shows the sixth schematic diagram of the pump pressure protection system of the present invention;

[0035] Figure 7 shows the seventh schematic diagram of the pump pressure protection system of the present invention;

[0036] Figure 8 shows the eighth schematic diagram of the pump pressure protection system of the present invention;

[0037] Figure 9 shows the ninth schematic diagram of the pump pressure protection system of the present invention;

[0038] Figure 10 shows one of the flowcharts of the pump pressure protection method of the pump pressure protection system of the present invention;

[0039] Figure 11 shows a second flowchart of the pump pressure protection method of the pump pressure protection system of the present invention.

[0040] Figure 12 shows the third flowchart of the pump pressure protection method of the pump pressure protection system of the present invention;

[0041] Figure 13 shows the fourth flowchart of the pump pressure protection method of the pump pressure protection system of the present invention.

[0042] Figure 14 shows the fifth flowchart of the pump pressure protection method of the pump pressure protection system of the present invention.

[0043] For electric drilling pumps, the actuator uses an electric control system, and the controller outputs control signals to connect to the start / stop control circuit of the drilling pump. In the diagram, 1 is the high-pressure valve, 2 is the tee, 3 is the low-pressure return, 4 is the high-pressure valve outlet, 5 is the riser pressure sensor, 6 is the pump pressure sensor, 7 is the pump pressure protection relay, 8 is the pump pressure protection solenoid valve, 9 is the start / stop relay for the electric valve motor, 10 is the electric valve limit switch, 11 is the electric valve, 12 is the pneumatic valve, 13 is the pneumatic valve limit switch, 14 is the pneumatic valve start / stop solenoid valve, 15 is the outlet tee for the dual-pump high-pressure valve, and 16 is the outlet four-way pipe for the triple-pump high-pressure valve. In each flow diagram, BP is the mud pressure detected by the pump pressure sensor, and LP is the mud pressure detected by the riser pressure sensor. Detailed Implementation Methods

[0044] To make the technical concept and advantages of this invention clearer, the technical solution of this invention will be further described in detail below with reference to the accompanying drawings. It should be understood that the following embodiments are only used to explain and illustrate preferred embodiments of this invention and should not be construed as limiting the scope of patent protection claimed by this invention. Embodiments

[0045] See Figures 1, 2, 3, or 4, and Figure 10. This invention relates to a drilling pump pressure protection system, comprising a high-pressure valve, a low-pressure return valve, a signal acquisition unit, and a control unit. The outlet pipe of the high-pressure valve is connected to the drilling high-pressure pipeline, and the outlet pipe of the low-pressure return valve is connected to the mud tank return pipeline. The high-pressure valve, low-pressure return valve, and a three-way pipe constitute a pump pressure protection gate assembly. One end of the three-way pipe's inlet is connected to the drilling pump's outlet, and the other two ends of the three-way pipe are connected to the high-pressure valve at one end and the low-pressure return valve at the other. The high-pressure valve is an electric valve or a pneumatic valve, and the low-pressure valve is a pneumatic valve. The switching of the electric valve controls the switching of the relay or the pneumatic valve. The control solenoid valve is connected to the control unit; the limit switch output signal of the electric or pneumatic valve is connected to the control unit; the signal acquisition unit uses a pressure sensor installed on the outlet pipeline of the high-pressure valve or drilling pump, and the pressure sensor output signal is connected to the control unit; the control unit monitors the mud pressure on the outlet pipeline of the high-pressure valve or drilling pump in real time, and controls the high-pressure valve and low-pressure return valve to open or close according to the control logic shown in Figure 10. The execution unit uses a pump pressure protection solenoid valve or pump pressure protection relay to perform interventional pump pressure protection control on the drilling pump:

[0046] 1) When the high-pressure valve is open, the low-pressure return valve is closed; when the high-pressure valve is closed, the low-pressure return valve is open.

[0047] 2) When the high-pressure valve is open and the low-pressure return valve is closed, if the mud pressure on the outlet pipeline of the high-pressure valve or the drilling pump is greater than the set value N, and N>0, the pump pressure protection solenoid valve connected in series in the mechanical pump control air circuit will be closed to stop the drilling pump (for electric pumps, the pump pressure protection relay connected in series in the electric pump control circuit will be disconnected to stop the drilling pump).

[0048] Alternatively, when the high-pressure valve is open and the low-pressure return valve is closed, if the mud pressure on the outlet line of the high-pressure valve or drilling pump is greater than the set value N, the low-pressure return valve connected to the mud tank for return is opened to release pressure.

[0049] In Figures 1 and 2, the high-pressure valve in the valve group uses an electric valve, and the low-pressure return valve uses a pneumatic valve.

[0050] The drilling pump pressure protection system described above uses an industrial computer and a PLC as its control unit. The PLC is connected to the industrial computer via a serial port. The pressure sensor output signal is connected to the PLC of the control unit via an AD module. As shown in Figure 2, for mechanical drilling pumps, the pump pressure protection solenoid valve is connected in series in the mechanical drilling pump control air circuit; for electric drilling pumps, the pump pressure protection relay is connected in series in the electric drilling pump control circuit, as shown in Figure 1.

[0051] The pump pressure protection solenoid valve or pump pressure protection relay is controlled and connected to the PLC of the control unit.

[0052] A pump pressure protection gate assembly is constructed using electric valves, pneumatic valves, and a three-way pipe. Utilizing the high torque and large diameter of the electric valves, they serve as high-pressure valves after the drilling pump exits water, facilitating the flow of drilling mud within the pipeline. The electric valves can also accurately determine whether the high-pressure valve is closed, ensuring no misoperation occurs during mud pump startup.

[0053] In Figures 3 and 4, both the high-pressure valve and the low-pressure return valve in the valve group are pneumatic valves. Figure 3 shows the application of this invention to an electric drilling pump, where the actuator uses a pump pressure protection relay connected in series in the electric drilling pump control circuit. Figure 4 shows the application of this invention to a mechanical drilling pump, where the actuator uses a pump pressure protection solenoid valve connected in series in the mechanical drilling pump control air circuit.

[0054] A pump pressure protection gate assembly consisting of two pneumatic valves and a three-way pipe is adopted. Taking advantage of the fast start and quick opening of the pneumatic valves, it serves as a low-pressure return water valve after the drilling pump produces water. When the drill bit water hole is blocked or the pump is started with the cock closed, the pneumatic valve can be opened quickly to release pressure, ensuring the safety of oil drilling production.

[0055] This invention relates to a pump pressure protection system. The control unit, based on the drilling pump pressure protection gate assembly and a signal acquisition unit, analyzes and judges the operating status of the high-pressure and low-pressure valves, as well as the pressure signal in the high-pressure pipeline. The system then executes pump pressure protection through an execution unit, effectively preventing pump pressure exceeding limits and pump stalling accidents caused by misjudgment or misoperation. Simultaneously, it automates the opening and stopping of the high and low-pressure gates of the drilling pump, solving the problem of automatic start / stop of high-pressure valves and reducing the impact of human factors. Example

[0056] Referring to Figures 1, 2, 3, 4, and 11, the drilling pump pressure protection system of this embodiment differs from that of Embodiment 1 in that: in step 2), if the mud pressure on the high-pressure valve or the drilling pump's outlet pipeline exceeds a set value N, the solenoid valve connected in series in the mechanical pump control air circuit is closed, or the relay connected in series in the electric pump control circuit is disconnected, stopping the pump; if the mud pressure on the high-pressure valve or the drilling pump's outlet pipeline exceeds a set value M (M>N), the low-pressure return valve connecting to the mud tank for return is opened to release pressure. That is, the control unit monitors the mud pressure on the high-pressure valve or the drilling pump's outlet pipeline in real time and controls the opening or closing of the high-pressure valve and the low-pressure return valve according to the control logic shown in Figure 11. The execution unit uses a pump pressure protection solenoid valve or a pump pressure protection relay to perform interventional pump pressure protection control on the drilling pump to ensure the safety of oil drilling production. Embodiment

[0057] See Figures 7 and 10. The drilling pump pressure protection system of this embodiment differs from that of Embodiment 1 in that: for drilling systems containing two or more drilling pumps, a pump pressure protection gate group is provided for each drilling pump. The inlet of the tee pipe of the pump pressure protection gate group is connected to the outlet of the corresponding drilling pump. The outlet pipe of the high-pressure valve is connected to the drilling high-pressure pipeline, and the outlet pipe of the low-pressure return valve is connected to the mud tank. The switching control relay of the electric valve or the switching control solenoid valve of the pneumatic valve is connected to the control unit. The limit switch output signal of the electric valve or pneumatic valve is connected to the control unit.

[0058] The control unit monitors the mud pressure on the outlet pipeline of the electric valve or drilling pump in real time, and controls the high-pressure valve and low-pressure return valve to open or close according to the following control logic. The execution unit uses a number of pump pressure protection solenoid valves or pump pressure protection relays corresponding to the drilling pump to perform interventional pump pressure protection control on the corresponding drilling pump:

[0059] (1) In the same pump pressure protection gate group, when the high pressure valve is open, the low pressure return valve is closed; when the high pressure valve is closed, the low pressure return valve is open.

[0060] (2) In any pump pressure protection gate group, when the high pressure valve is open and the low pressure return valve is closed, if the mud pressure on the outlet pipeline of the high pressure valve or the drilling pump is greater than the set value N, N>0, then the pump pressure protection solenoid valve connected in series in the mechanical pump control air circuit is closed to stop the drilling pump or the pump pressure protection relay connected in series in the electric pump control circuit is disconnected to stop the drilling pump; or, the low pressure return valve connected to the mud tank return is opened to release pressure.

[0061] Figure 7 shows a drilling pump pressure protection system. The high-pressure valve in the pressure protection gate assembly uses an electric valve, while the low-pressure return valve uses a pneumatic valve. This system is applied to an electric drilling pump. Example

[0062] See Figures 7 and 11. The drilling pump pressure protection system of this embodiment differs from that of Embodiment 3 in that: in step (2), in any pump pressure protection gate group, when the high-pressure valve is open and the low-pressure return valve is closed, if the mud pressure on the high-pressure valve or the drilling pump's outlet pipeline is greater than the set value N, the solenoid valve connected in series in the mechanical pump control air circuit is closed, or the relay connected in series in the electric pump control circuit is disconnected to stop the drilling pump from running; if the mud pressure on the high-pressure valve or the drilling pump's outlet pipeline is greater than the set value M, where M>N, the low-pressure return valve connected to the mud tank return is opened to release pressure. Embodiment

[0063] See Figure 5 or 6 and Figure 12. The drilling pump pressure protection system of this embodiment includes a high-pressure valve, a low-pressure return valve, a signal acquisition unit, and a control unit. The outlet pipe of the high-pressure valve is connected to the drilling high-pressure pipeline, and the outlet pipe of the low-pressure return valve is connected to the mud tank return pipeline. The high-pressure valve, the low-pressure return valve, and the tee pipe constitute a pump pressure protection gate group. One end of the tee pipe's inlet is connected to the drilling pump's outlet, and the other two ends of the tee pipe are connected to the high-pressure valve at one end and the low-pressure return valve at the other. The high-pressure valve is an electric valve or a pneumatic valve, and the low-pressure return valve is a pneumatic valve. The switching control relay of the electric valve... The solenoid valve controlling the on / off state of the electric or pneumatic valve is connected to the control unit; the limit switch output signal of the electric or pneumatic valve is connected to the control unit; the signal acquisition unit acquires the pressure signal on the outlet pipeline of the high-pressure valve or drilling pump and the electric pump speed setpoint signal and transmits them to the control unit; the control unit monitors the mud pressure on the outlet pipeline of the high-pressure valve or drilling pump in real time, and controls the high-pressure valve and low-pressure return valve to open or close according to the following control logic, and performs interventional pump pressure protection control of the drilling pump by controlling the electric pump speed setpoint signal through the execution unit:

[0064] (1) When the high-pressure valve is open, the low-pressure return valve is closed; when the high-pressure valve is closed, the low-pressure return valve is open.

[0065] (2) When the high pressure valve is open and the low pressure return valve is closed, if the mud pressure on the outlet pipeline of the high pressure valve or the drilling pump is greater than the set value N, where N>0, a control signal is output to the control device of the electric drilling pump to reduce the speed of the drilling pump, or stop the pump, or open the low pressure return valve connected to the mud tank return to release pressure.

[0066] That is, the control unit monitors the mud pressure on the outlet pipeline of the high-pressure valve or drilling pump in real time, and controls the high-pressure valve and low-pressure return valve to open or close according to the control logic shown in Figure 12. The execution unit uses a pump pressure protection solenoid valve or a pump pressure protection relay to perform interventional pump pressure protection control on the drilling pump.

[0067] In Figures 5 and 6, both the high-pressure valve and the low-pressure return valve in the valve assembly are pneumatic valves. Applied to electric drilling pumps, the control unit monitors the mud pressure on the high-pressure valve or the pump's outlet pipeline in real time, and controls the opening or closing of the high-pressure valve and low-pressure return valve according to the control logic shown in Figure 12. The execution unit controls the electric pump speed setpoint signal to perform interventional pump pressure protection control on the drilling pump. Example

[0068] See Figures 5 or 6 and 13. The drilling pump pressure protection system of this embodiment differs from that of Embodiment 5 in that: in step 2), if the mud pressure on the high-pressure valve or the drilling pump's outlet pipeline exceeds a set value N, a control signal is output to the control device of the electric drilling pump to reduce its speed; if the mud pressure on the high-pressure valve or the drilling pump's outlet pipeline continues to exceed a set value N1 (N1>N), a control signal is output to the control device of the electric drilling pump to gradually reduce its speed until it stops. In other words, the control unit monitors the mud pressure on the high-pressure valve or the drilling pump's outlet pipeline in real time and controls the high-pressure valve and low-pressure return valve to open or close according to the control logic shown in Figure 13. The execution unit controls the electric pump's speed setpoint signal to perform interventional pump pressure protection control on the drilling pump. Embodiment

[0069] See Figure 5 or Figure 6 and Figure 14. The drilling pump pressure protection system of this embodiment differs from that of Embodiment 6 in that: in step 2), if the mud on the high-pressure valve or the water outlet pipeline of the drilling pump is greater than the set value N2, the low-pressure return valve connected to the mud tank for return is opened to release pressure; where N2>N1.

[0070] The control unit monitors the mud pressure on the outlet pipeline of the high-pressure valve or drilling pump in real time, and controls the high-pressure valve and low-pressure return valve to open or close according to the control logic shown in Figure 14. The execution unit controls the electric pump speed set signal to perform interventional pump pressure protection control on the drilling pump.

[0071] The aforementioned drilling pump pressure protection system includes an industrial computer and a PLC as the control unit. The PLC is connected to the industrial computer via a serial port. The pressure sensor output signal is connected to the PLC of the control unit via an AD module. The electric pump speed command signal is converted by the AD module and then transmitted to the PLC. The execution unit outputs a control signal from the PLC, which is then transmitted to the control device of the electric drilling pump via a DA module, providing interventional pump pressure protection for the drilling pump. Example

[0072] See Figures 8 and 12. The drilling pump pressure protection system in this embodiment differs from that in Embodiment 5 in that: for drilling systems containing two or more drilling pumps, a pump pressure protection gate group is set up for each drilling pump. The inlet of the three-way pipe of the pump pressure protection gate group is connected to the outlet of the corresponding drilling pump. The outlet pipe of the high-pressure valve is connected to the drilling high-pressure pipeline, and the outlet pipe of the low-pressure return valve is connected to the mud tank. The electric valve switch control relay and the pneumatic valve switch control solenoid valve of the pump pressure protection gate group are controlled and connected to the control unit. The limit switch output signals of the electric valve and pneumatic valve of each pump pressure protection gate group are connected to the control unit. The signal acquisition unit collects the mud pressure signal on the outlet pipeline of the high-pressure valve or drilling pump and the electric pump speed setpoint signal in real time and transmits them to the control unit. As shown in Figure 12, the control unit monitors the mud pressure on the outlet pipeline of the electric valve or drilling pump in real time and controls the high-pressure valve and low-pressure return valve to open or close according to the following control logic. The execution unit controls the electric pump speed setpoint signal to perform interventional pump pressure protection control on the drilling pump.

[0073] (1) When the high-pressure valve is open, the low-pressure return valve is closed; when the high-pressure valve is closed, the low-pressure return valve is open.

[0074] (2) When the high pressure valve is open and the low pressure return valve is closed, if the mud pressure on the outlet pipeline of the high pressure valve or the drilling pump is greater than the set value N, output a control signal to the control device of the electric drilling pump to reduce the speed of the drilling pump, or stop the pump, or open the low pressure return valve connected to the mud tank return to release pressure.

[0075] Figure 8 shows a drilling pump pressure protection system. The high-pressure valve in the pressure protection gate assembly is an electrically operated valve, while the low-pressure return valve is a pneumatically operated valve. This system is applied to an electric drilling pump. Example

[0076] See Figures 8 and 13. The drilling pump pressure protection system of this embodiment differs from that of Embodiment 8 in that: in step 2), if the mud pressure on the high-pressure valve or the outlet pipeline of the drilling pump is greater than the set value N, a control signal is output to the control device of the electric drilling pump to reduce the pump speed; if the mud pressure on the high-pressure valve or the outlet pipeline of the drilling pump continues to be greater than the set value N1 (N1>N), a control signal is output to the control device of the electric drilling pump to gradually reduce the pump speed until the pump stops.

[0077] The control unit monitors the mud pressure on the outlet pipeline of the electric valve or drilling pump in real time, and controls the high-pressure valve and low-pressure return valve to open or close according to the control logic shown in Figure 13. The execution unit controls the electric pump speed setpoint signal to perform interventional pump pressure protection control on the drilling pump. Example

[0078] See Figures 8 and 14. The drilling pump pressure protection system in this embodiment differs from that in Embodiment 9 in that, in step 2), if the mud pressure on the high-pressure valve or the drilling pump's outlet pipeline exceeds a set value N2 (N2>N1), the low-pressure return valve connecting to the mud tank for return is opened to release pressure. That is, the control unit monitors the mud pressure on the electric valve or the drilling pump's outlet pipeline in real time and controls the high-pressure valve and low-pressure return valve to open or close according to the control logic shown in Figure 14. The execution unit controls the electric pump speed setpoint signal to perform interventional pump pressure protection control on the drilling pump.

[0079] Figure 9 shows a drilling pump pressure protection system for a drilling system containing three drilling pumps. Each drilling pump is equipped with a corresponding pump pressure protection gate group. The inlet of the tee pipe of each pump pressure protection gate group is connected to the outlet of the corresponding drilling pump. The outlet pipe of the high-pressure valve is connected to the drilling high-pressure pipeline, and the outlet pipe of the low-pressure return valve is connected to the mud tank. The electric valve switch control relay and the pneumatic valve switch control solenoid valve of the pump pressure protection gate group are controlled and connected to the control unit. The limit switch output signals of the electric valve and pneumatic valve of each pump pressure protection gate group are connected to the control unit. The signal acquisition unit collects the mud pressure signal on the outlet pipeline of the high-pressure valve or drilling pump and the electric pump speed setpoint signal in real time and transmits them to the control unit. The control unit monitors the mud pressure on the outlet pipeline of the electric valve or drilling pump in real time. Depending on the application scenario, the high-pressure valve and low-pressure return valve can be opened or closed according to the control logic shown in Figures 10, 11, 12, or 13. The execution unit performs interventional pump pressure protection control on the drilling pump.

[0080] The pump pressure protection system of this invention can effectively prevent pump pressure from exceeding limits and pump stalling accidents caused by misjudgment or misoperation. At the same time, it can automate the opening and closing of high and low pressure gates of drilling pumps, effectively ensuring the safety of oil drilling production.

[0081] The above description is merely a preferred embodiment of the present invention and does not constitute a limitation thereof. Those skilled in the art, guided by existing technology, can make other modifications to the implementation of the present invention without creative effort. Any modifications made within the spirit and principles of the present invention, or simple substitutions or equivalent replacements using conventional techniques in the art, should be included within the scope of protection of the present invention.

Claims

1. A drilling pump pressure protection system, comprising a high-pressure valve, a low-pressure return valve, a signal acquisition unit, and a control unit, wherein the outlet pipe of the high-pressure valve is connected to the drilling high-pressure pipeline, and the outlet pipe of the low-pressure return valve is connected to the mud tank return pipeline; characterized in that: The pump pressure protection gate assembly consists of a high-pressure valve, a low-pressure return valve, and a three-way pipe. One end of the three-way pipe's inlet is connected to the drilling pump's outlet, and the other two ends are connected to the high-pressure valve and the low-pressure return valve, respectively. The high-pressure valve is either an electric or pneumatic valve, and the low-pressure return valve is also a pneumatic valve. The switching control relay of the electric valve or the switching control solenoid valve of the pneumatic valve is connected to the control unit. The limit switch output signal of the electric or pneumatic valve is connected to the control unit. The signal acquisition unit uses a pressure sensor installed on the outlet pipeline of the high-pressure valve or drilling pump, and the pressure sensor's output signal is connected to the control unit. The control unit monitors the mud pressure on the outlet pipeline of the high-pressure valve or drilling pump in real time and controls the high-pressure valve and the low-pressure return valve according to the following control logic. Open or close, the drilling pump is controlled by the pump pressure protection solenoid valve or pump pressure protection relay through the execution unit: (1) When the high pressure valve is open, the low pressure return valve is closed; when the high pressure valve is closed, the low pressure return valve is open; (2) When the high pressure valve is open and the low pressure return valve is closed, if the mud pressure on the outlet pipeline of the high pressure valve or the drilling pump is greater than the set value N, N>0, the pump pressure protection solenoid valve connected in series in the mechanical pump control air circuit is closed to stop the drilling pump, or the pump pressure protection relay connected in series in the electric pump control circuit is disconnected to stop the drilling pump, or the low pressure return valve connected to the mud tank return is opened to release pressure; if the mud pressure on the outlet pipeline of the high pressure valve or the drilling pump is greater than the set value M, M>N, the low pressure return valve connected to the mud tank return is opened to release pressure.

2. The drilling pump pressure protection system according to claim 1, characterized in that: For drilling systems containing two or more drilling pumps, each drilling pump is equipped with a corresponding pump pressure protection gate assembly. The inlet of the tee pipe of the pump pressure protection gate assembly is connected to the outlet of the corresponding drilling pump. The outlet pipe of the high-pressure valve is connected to the drilling high-pressure pipeline, and the outlet pipe of the low-pressure return valve is connected to the mud tank. The switching control relay of the electric valve or the switching control solenoid valve of the pneumatic valve is connected to the control unit. The limit switch output signal of the electric valve or pneumatic valve is connected to the control unit. The control unit monitors the mud pressure on the outlet pipeline of the electric valve or drilling pump in real time, and controls the high-pressure valve and the low-pressure return valve to open or close according to the following control logic. This is achieved through the execution unit using the drilling... The corresponding number of pump pressure protection solenoid valves or pump pressure protection relays of the pumps respectively perform intervention-type pump pressure protection control on the corresponding drilling pumps: (1) In the same pump pressure protection gate group, when the high pressure valve is open, the low pressure return valve is closed; when the high pressure valve is closed, the low pressure return valve is open; (2) In any pump pressure protection gate group, when the high pressure valve is open and the low pressure return valve is closed, if the mud pressure on the outlet pipeline of the high pressure valve or the drilling pump is greater than the set value N, N>0, then the pump pressure protection solenoid valve connected in series in the mechanical pump control air circuit is closed to stop the drilling pump from running or the pump pressure protection relay connected in series in the electric pump control circuit is disconnected to stop the drilling pump from running; or, the low pressure return valve connected to the mud tank return is opened to release pressure.

3. The drilling pump pressure protection system according to claim 2, characterized in that: In step (2), in any pump pressure protection gate group, when the high-pressure valve is open and the low-pressure return valve is closed, if the mud pressure on the outlet pipeline of the high-pressure valve or the drilling pump is greater than the set value N, the solenoid valve connected in series in the mechanical pump control air circuit is closed or the relay connected in series in the electric pump control circuit is disconnected to stop the drilling pump from running; if the mud pressure on the outlet pipeline of the high-pressure valve or the drilling pump is greater than the set value M, and M>N, the low-pressure return valve connected to the mud tank return is opened to release pressure.

4. A drilling pump pressure protection system, comprising a high-pressure valve, a low-pressure return valve, a signal acquisition unit, and a control unit, wherein the outlet pipe of the high-pressure valve is connected to the drilling high-pressure pipeline, and the outlet pipe of the low-pressure return valve is connected to the mud tank return pipeline; characterized in that: The pump pressure protection gate assembly consists of a high-pressure valve, a low-pressure return valve, and a three-way pipe. One end of the three-way pipe's inlet is connected to the drilling pump's outlet, and the other two ends are connected to the high-pressure valve and the low-pressure return valve, respectively. The high-pressure valve is either an electric or pneumatic valve, and the low-pressure return valve is also a pneumatic valve. The switching control relay of the electric valve or the switching control solenoid valve of the pneumatic valve is connected to the control unit. The limit switch output signal of the electric or pneumatic valve is connected to the control unit. The signal acquisition unit acquires the pressure signal on the outlet pipeline of the high-pressure valve or drilling pump, as well as the electric pump speed setpoint signal, and transmits them to the control unit. The control unit monitors the mud pressure on the outlet pipeline of the high-pressure valve or drilling pump in real time and controls the high-pressure valve according to the following control logic. The high-pressure valve and low-pressure return valve are opened or closed, and the drilling pump is controlled by the electric pump speed given signal through the execution unit to perform interventional pump pressure protection control: (1) When the high-pressure valve is open, the low-pressure return valve is closed; when the high-pressure valve is closed, the low-pressure return valve is open; (2) When the high-pressure valve is open and the low-pressure return valve is closed, if the mud pressure on the outlet pipeline of the high-pressure valve or the drilling pump is greater than the set value N, where N>0, the control signal is output to the control device of the electric pump to make the electric pump run at a reduced speed, or stop the pump, or open the low-pressure return valve connected to the mud tank return to release pressure; if the mud pressure on the outlet pipeline of the high-pressure valve or the drilling pump continues to be greater than the set value N1, where N1>N, the control signal is output to the control device of the electric pump to make the electric pump speed gradually decrease until the pump stops.

5. The drilling pump pressure protection system according to claim 4, characterized in that: If the mud pressure on the outlet pipeline of the high-pressure valve or drilling pump is greater than the set value N2, open the low-pressure return valve connected to the mud tank to release the pressure; where N2>N1.

6. The drilling pump pressure protection system according to claim 4, characterized in that: For drilling systems containing two or more drilling pumps, each drilling pump is equipped with a corresponding pump pressure protection gate assembly. The inlet of the tee pipe of the pump pressure protection gate assembly is connected to the outlet of the corresponding drilling pump. The outlet pipe of the high-pressure valve is connected to the drilling high-pressure pipeline, and the outlet pipe of the low-pressure return valve is connected to the mud tank. The electric valve switch control relay and the pneumatic valve switch control solenoid valve of the pump pressure protection gate assembly are controlled and connected to the control unit. The limit switch output signals of the electric valve and pneumatic valve of each pump pressure protection gate assembly are connected to the control unit. The signal acquisition unit acquires the mud pressure signal on the outlet pipeline of the high-pressure valve or drilling pump and the pump speed setpoint signal of the electric pump in real time. Transmitted to the control unit; the control unit monitors the mud pressure on the outlet pipeline of the electric valve or drilling pump in real time, and controls the high pressure valve and low pressure return valve to open or close according to the following control logic, and controls the drilling pump to perform interventional pump pressure protection control by controlling the electric pump speed given signal through the execution unit: (1) When the high pressure valve is open, the low pressure return valve is closed; when the high pressure valve is closed, the low pressure return valve is open; (2) When the high pressure valve is open and the low pressure return valve is closed, if the mud pressure on the outlet pipeline of the high pressure valve or drilling pump is greater than the set value N, the control signal is output to the control device of the electric pump to make the electric pump run at a reduced speed, or stop the pump, or open the low pressure return valve connected to the mud tank return to release pressure.

7. The drilling pump pressure protection system according to claim 6, characterized in that: In step 2), if the mud pressure on the outlet pipeline of the high-pressure valve or drilling pump is greater than the set value N, a control signal is output to the control device of the electric drilling pump to reduce the speed of the drilling pump; if the mud pressure on the outlet pipeline of the high-pressure valve or drilling pump continues to be greater than the set value N1, where N1>N, a control signal is output to the control device of the electric pump to gradually reduce the pump speed until the pump stops.

8. The drilling pump pressure protection system according to claim 7, characterized in that: If the mud pressure on the outlet pipeline of the high-pressure valve or drilling pump is greater than the set value N2 (N2>N1), then the low-pressure return valve connected to the mud tank for return is opened to release the pressure.

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