Methods for preventing pump blocking during the start-up of drilling pumps in oil drilling projects

Abstract

The present invention relates to a method for preventing pump blocking during the start-up process of a drilling pump in a petroleum drilling project. When a controller determines that a pump blocking situation may occur, the drilling pump is stopped and started. The process is as follows: 1) real-time acquisition of the rotation speed R of the drilling pump; 2) real-time acquisition of the mud flow rate S or pressure LP in the high-pressure pipeline; 3) setting the mud flow rate s or pressure lp in the high-pressure pipeline when the drilling pump is normally started, when the drilling pump's operating speed is r; (1) if R ≥ r and S ≥ s or LP ≥ lp, it is determined that the high-pressure valve of the drilling pump is in an open state and the pump will not be blocked; (2) if R ≥ r and S < s or LP < lp, it is determined that the high-pressure valve of the drilling pump is in a closed state, and it is predicted that the pump will be blocked, and the drilling pump is stopped and started. The present invention has a simple implementation process and a fast response speed, can effectively prevent the drilling pump from being misoperated, timely and accurately implement pump pressure safety protection, and prevent and avoid the occurrence of pump blocking accidents.

Description

Technical Field

[0001] The present invention relates to a safety control technology for oil drilling projects, and in particular to a pump pressure protection method for preventing misoperation of a drilling pump, monitoring and judging whether the drilling pump will be blocked, and preventing and treating the same. Background Art

[0002] In oil drilling projects, implementing necessary pump pressure protection measures is an effective safety measure to prevent extreme pump blocking (commonly known as pump choking) accidents caused by starting the drilling pump with the high-pressure valve closed. However, ensuring safe and orderly production requires accurate and timely determination of pump blocking. The accuracy, efficiency, and timeliness of this monitoring and determination method directly impact the timely, efficient, and safe performance of the pump pressure protection system.

[0003] There are many ways to monitor whether a drilling pump will be blocked. As to which one is the safest and most efficient, and how to make accurate and timely judgments at the lowest cost and with the simplest process, it is related to the safety of collective and individual life and property. Therefore, it is necessary to conduct continuous exploration to achieve safety protection in a race against time and eliminate safety hazards.

[0004] The applicant's previously filed invention patent, "Method for Preventing Drilling Pump Misoperation in Oil Drilling Projects and Pump Pressure Protection System Thereof" (Patent No.: 201811049380.2), proposes a method for preventing drilling pump misoperation in oil drilling projects. A pressure sensor is installed on both the drilling pump and the riser. By comparing the difference between the riser pressure and the drilling pump pressure, it is determined whether a drilling pump misoperation has occurred. However, in practice, fluid pressure in the pipeline accumulates to a certain level, and this process takes time to reach a certain value. Therefore, comparing the changes in riser pressure and drilling pump pressure to determine whether a pump suffocation has occurred requires a long reaction time, which is not conducive to preventing accidents in the first place.

[0005] To this end, the applicant has explored and tried various technical ideas, with only one purpose, which is to achieve pump pressure safety protection in a timely and accurate manner and effectively protect the lives and property of the people. Summary of the Invention

[0006] In order to realize pump pressure safety protection in a timely and accurate manner, the present invention proposes a method for preventing drilling pumps from being blocked. Several prediction and judgment methods adopt a systematic technical concept, which can accurately determine whether a pump is blocked at the first time.

[0007] The technical solution adopted in the present invention is:

[0008] A method for preventing pump blocking during the start-up process of a drilling pump in a petroleum drilling project stops the drilling pump when it is determined that a pump blocking situation may occur. The process executed by the controller is as follows:

[0009] 1) Real-time acquisition of the drilling pump speed R;

[0010] 2) Real-time acquisition of the mud flow rate S in the high-pressure pipeline;

[0011] 3) When the drilling pump starts normally, the operating speed of the drilling pump is set to r, and the mud flow rate in the high-pressure pipeline is set to s;

[0012] (1) If R ≥ r and S ≥ s, it is judged that the high-pressure valve of the drilling pump is in the open state, and there is no suffocation of the pump. The drilling pump is started normally;

[0013] (2) If R ≥ r and S < s, the high-pressure valve of the drilling pump is judged to be in the closed state, and it is predicted that the pump will be suffocated, so the drilling pump is stopped.

[0014] A method for preventing pump blocking during the start-up process of a drilling pump in a petroleum drilling project is implemented by a controller. When it is determined that a pump blocking situation may occur, the drilling pump is stopped. The process is as follows:

[0015] 1) Real-time acquisition of drilling pump speed R;

[0016] 2) Real-time collection of mud pressure LP in the riser;

[0017] 3) When the drilling pump starts normally, the operating speed of the drilling pump is set to r, and the mud pressure in the riser is set to lp;

[0018] (1) If R ≥ r and LP ≥ lp, it is judged that the high-pressure valve of the drilling pump is in the open state, and there is no suffocation of the pump, and the drilling pump can be started;

[0019] (2) If R≥r and LP<lp, it is judged that the high-pressure valve of the drilling pump is in the closed state, and the pump is likely to be suffocated, so the drilling pump is stopped.

[0020] A method for preventing pump blocking during the start-up process of a drilling pump in a petroleum drilling project is implemented by a controller. When it is determined that a pump blocking situation may occur, the drilling pump is stopped. The process is as follows:

[0021] 1) Real-time acquisition of mud flow rate S in high-pressure pipelines;

[0022] 2) Real-time acquisition of the given voltage control signal V of the electric drilling pump;

[0023] 3) When the electric drilling pump starts normally, the mud flow rate in the high-pressure pipeline is set to s, and the given voltage control signal v of the drilling pump is set;

[0024] (1) If V ≥ v and S ≥ s, it is judged that the high-pressure valve of the drilling pump is in the open state, and there is no suffocation of the pump, and the drilling pump can be started;

[0025] (2) If V≥v and S<s, it is judged that the high-pressure valve of the drilling pump is in the closed state, and the pump is likely to be suffocated, so the drilling pump is stopped.

[0026] A method for preventing pump blocking during the start-up process of a drilling pump in a petroleum drilling project is implemented by a controller. When it is determined that a pump blocking situation may occur, the drilling pump is stopped. The process is as follows:

[0027] 1) Real-time collection of mud pressure LP in the riser;

[0028] 2) Collect the given voltage control signal V of the electric drilling pump;

[0029] 3) When the electric drilling pump starts normally, the mud pressure in the riser is set to lp and the given voltage control signal v of the drilling pump is set;

[0030] (1) If V ≥ v and LP ≥ lp, it is judged that the high-pressure valve of the drilling pump is in the open state, and the drilling pump will not be suffocated. The drilling pump can be started;

[0031] (2) If V≥v and LP<lp, it is judged that the high-pressure valve of the drilling pump is in the closed state, and the pump is likely to be suffocated, so the drilling pump is stopped.

[0032] A method for preventing pump blocking during the start-up process of a drilling pump in a petroleum drilling project is implemented by a controller. When it is determined that a pump blocking situation may occur, the process of stopping the start-up of the drilling pump is as follows:

[0033] 1) Real-time collection of drilling pump mud pressure BP;

[0034] 2) Real-time acquisition of the mud flow rate S in the high-pressure pipeline;

[0035] 3) When the drilling pump is started normally, the mud pressure of the drilling pump is set to bp, and the mud flow rate in the high-pressure pipeline is set to s;

[0036] (1) If BP ≥ bp and S ≥ s, it is judged that the high-pressure valve of the drilling pump is in the open state, there will be no suffocation of the pump, and the drilling pump can be started normally;

[0037] (2) If BP≥bp and S<s, it is judged that the high-pressure valve of the drilling pump is in the closed state, and the pump is likely to be suffocated, so the drilling pump is stopped.

[0038] In the method for preventing drilling pump from blocking, the flow rate sensor installed on the pipeline downstream of the high-pressure valve can be a flow rate sensor in contact with the measured fluid or a flow rate sensor in non-contact with the measured fluid.

[0039] The method for preventing pump blocking during the startup process of a drilling pump in an oil drilling project is as follows: for a mechanical drilling pump (pump pressure protection system), a normally open solenoid valve is connected in series to the start-stop control air circuit of the drilling pump. The normally open solenoid valve is controlled by a controller. When the controller determines that the high-pressure valve of the drilling pump is in a closed state and the pump is about to block, it issues a control command to open the normally closed pneumatic valve to release pressure. At the same time, the normally open solenoid valve closes, cutting off the control air circuit of the drilling pump and causing the drilling pump to stop operating.

[0040] In the method for preventing pump blocking during the startup of a drilling pump in a petroleum drilling project, for an electric drilling pump (pump pressure protection system), a controller is associated with the start-stop control system of the electric drilling pump. When it is determined that the high-pressure valve of the drilling pump is in a closed state, which may cause the pump to block, the controller issues a control command to open the normally closed pneumatic valve to release pressure. At the same time, the start-stop control system of the drilling pump receives the pump stop command issued by the controller, causing the drilling pump to stop operation.

[0041] The pump pressure protection system for preventing pump blocking of drilling pumps is thereby implemented by the method for preventing pump blocking during the startup process of a drilling pump in an oil drilling project as described in any of the above-mentioned methods. During the startup process of the drilling pump, it is predicted and determined whether there is a pump blocking situation. A normally closed pneumatic valve is installed on the low-pressure return water pipeline of the drilling pump as the low-pressure return water valve of the drilling pump. The actuator for controlling the opening and closing of the normally closed pneumatic valve is controlled by a controller. When the controller determines that the high-pressure valve of the drilling pump is in a closed state and there is a pump blocking situation, a control command is issued to stop starting the drilling pump, and at the same time, the normally closed pneumatic valve is opened to release pressure.

[0042] Beneficial effects of the invention:

[0043] 1. The present invention provides a method for preventing pump stalling during the startup process of a drilling pump in a petroleum drilling project. By real-time monitoring of the drilling pump pulley speed and the mud flow rate and / or mud pressure signal within the drilling pump's high-pressure pipeline, the method determines whether the drilling pump's high-pressure valve is open, thereby determining whether a pump stalling event is likely. This method is simple to implement, offers rapid response, and provides intuitive operation. It can prevent improper operation of the drilling pump, effectively preventing and avoiding pump stalling accidents.

[0044] 2. The present invention's method for preventing pump stalling during the startup process of a drilling pump in a petroleum drilling project utilizes real-time monitoring of the mud pressure signal at the electric drilling pump's outlet and the mud flow rate within the drilling pump's high-pressure pipeline to determine whether the drilling pump's high-pressure valve is open, thereby determining whether the pump is likely to stall. This simple implementation process offers a rapid response and prevents improper operation of the drilling pump, effectively preventing and avoiding pump stalling accidents.

[0045] 3. The present invention's method for preventing pump blocking during the startup process of a drilling pump in a petroleum drilling project uses real-time monitoring of the drilling pump's given voltage control signal and the mud flow rate and / or pressure signal within the drilling pump's high-pressure pipeline to determine whether the drilling pump's high-pressure valve is open and whether pump blocking could occur. This method addresses the source of danger, moving the prediction and judgment process forward. This method is fast, effective, timely, accurate, and cost-effective.

[0046] 4. The present invention's method for preventing pump blockage during the startup of a drilling pump in a petroleum drilling project requires no modifications to existing pump pressure protection system hardware, thus increasing equipment costs. It is easily implemented, ensuring safe production in oil drilling operations and offering significant social and economic benefits. In practical applications, a combination of multiple determination methods, such as detecting the operating speed of the drilling pump pulley, the flow rate of mud in the drilling pump's high-pressure pipeline, and collecting a given voltage control signal from the electric drilling pump, can be used to verify each other and achieve higher accuracy.

[0047] 5. The present invention provides a method for preventing pump blocking during the startup of a drilling pump in a petroleum drilling project. This method employs an accurate and simple method to predict whether a pump blocking situation will occur during the startup process. A normally closed pneumatic valve is installed on the low-pressure return line of the drilling pump as the low-pressure return valve for the drilling pump. The actuator for opening and closing the normally closed pneumatic valve is controlled by a controller. When the controller determines that the high-pressure valve of the drilling pump is closed, indicating a pump blocking situation, it issues a control command to open the normally closed pneumatic valve to relieve pressure. This effectively prevents improper operation of the drilling pump and prevents and avoids pump blocking accidents. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] Figure 1 、 Figure 3 、 Figure 5 、 Figure 9 This is a schematic diagram of the pump pressure protection system structure for mechanical drilling pumps to prevent pump blockage;

[0049] Figure 2 、 Figure 4 、 Figure 6 、 Figure 7 、 Figure 8 、 Figure 10 This is a schematic diagram of the structure of the electric drilling pump pressure protection system;

[0050] In the figure, label 1 is the flow rate sensor; 2 is the high-pressure valve; 3 is the pump speed sensor; 4 is the low-pressure return valve; 5 is the solenoid valve; 6 is the pump control switch; 7 is the handwheel setting; 8 is the riser pressure sensor; 9 is the pump pressure sensor; 10 is the normally closed pneumatic valve. DETAILED DESCRIPTION

[0051] The technical solution of the present invention is further described in detail below through specific implementation methods with reference to the accompanying drawings.

[0052] Example 1

[0053] like Figure 1 、 Figure 2 As shown, the method for preventing pump blocking during the startup of a drilling pump in a petroleum drilling project of the present invention comprises: installing a pump speed sensor on the drilling pump to collect the operating speed R of the drilling pump, and transmitting the speed signal to a controller; installing a flow rate sensor on the pipeline downstream of the high-pressure valve to collect the mud flow rate S in the high-pressure pipeline, and transmitting the flow rate signal to the controller;

[0054] When the drilling pump is started normally, the operating speed of the drilling pump is set to r, and the mud flow rate in the high-pressure pipeline is set to s. When the drilling pump is started, the controller collects the operating speed of the drilling pump and the mud flow rate in the high-pressure pipeline in real time. The operating speed R of the drilling pump and the mud flow rate S in the high-pressure pipeline are calculated in real time and compared with the operating speed r of the drilling pump and the mud flow rate s in the high-pressure pipeline under normal starting state to determine whether the drilling pump is blocked:

[0055] (1) If R ≥ r and S ≥ s, it is judged that the high-pressure valve of the drilling pump is in the open state, and there is no suffocation of the pump, and the drilling pump can be started;

[0056] (2) If R≥r and S<s, it is judged that the high-pressure valve of the drilling pump is in the closed state, and the pump is likely to be suffocated. The drilling pump cannot be started.

[0057] From the perspective of logical relationships, when the drilling pump is started, the four elements R, r and S, s are used to determine whether the drilling pump is blocked. In addition to the two logical combinations mentioned above, there are the following two logical combinations, namely:

[0058] (3) If R < r, S < s or S = 0, the drilling pump is judged to be in idle state, which is not dangerous;

[0059] (4) If R < r, but S ≥ s, then it can be generally determined that the sensor is damaged or there is a problem with the drilling pump. This is because in real life and production, there is no situation where a drilling pump fails to operate normally and outputs a large amount of energy (the transported fluid does not gain kinetic energy and flows in the pipeline). Therefore, it can be determined that there is a problem with the sensor or the drilling pump itself.

[0060] Since the present invention focuses on how to prevent and avoid the pump from being suffocated when the drilling pump is started, only the first two cases are studied here for the four logical combination judgments of the four elements R, r and S, s.

[0061] Example 2

[0062] See also Figure 3 、 Figure 4 The present embodiment provides a method for preventing pump blocking during the startup of a drilling pump in a petroleum drilling project. The implementation process is as follows: a pump speed sensor is installed on the drilling pump to detect the operating speed R of the drilling pump and transmit the speed signal to a controller. A pressure sensor is installed on the riser to detect the mud pressure LP in the riser and transmit the pressure signal to the controller. The mud pressure in the riser is preset to be lp (lp>0) when the drilling pump is normally started and the operating speed is r (r>0). The controller executes the following program steps to determine whether the drilling pump is blocking:

[0063] When the drilling pump is started, the operating speed of the drilling pump and the mud pressure in the standing pressure pipeline are collected in real time;

[0064] Calculate the drilling pump's operating speed R and the mud pressure LP in the standing pressure line in real time, and compare them with the drilling pump's operating speed r and the mud flow rate lp in the high-pressure line under normal startup conditions:

[0065] (1) If R ≥ r and LP ≥ lp, it is judged that the high-pressure valve of the drilling pump is in the open state, and the drilling pump will not be suffocated. The drilling pump can be started;

[0066] (2) If R≥r and LP<lp, it is judged that the high-pressure valve of the drilling pump is in the closed state, and the pump is likely to be suffocated. The drilling pump cannot be started.

[0067] Example 3

[0068] See also Figure 7 The present embodiment provides a method for preventing pump blocking during the startup of a drilling pump in a petroleum drilling project. The process is as follows: a flow rate sensor is installed on the pipeline downstream of the high-pressure valve to collect the mud flow rate S in the high-pressure pipeline in real time and transmit the flow rate signal to a controller. Simultaneously, the controller collects the given voltage control signal V of the electric drilling pump in real time. The controller executes the following program to determine whether the drilling pump is blocking:

[0069] 1) When the drilling pump is started normally, the given voltage control signal of the electric drilling pump is v, and the mud flow rate in the high-pressure pipeline is s;

[0070] 2) When the drilling pump is started, the given voltage control signal of the electric drilling pump and the mud flow rate in the high-pressure pipeline are collected in real time;

[0071] 3) Calculate the given voltage control signal V of the electric drilling pump and the mud flow rate S in the high-pressure pipeline in real time, and compare them with the given voltage control signal v of the electric drilling pump and the mud flow rate s in the high-pressure pipeline in the normal startup state:

[0072] (1) If V ≥ v and S ≥ s, it is judged that the high-pressure valve of the drilling pump is in the open state, and there is no suffocation of the pump, and the drilling pump can be started;

[0073] (2) If V≥v and S<s, it is judged that the high-pressure valve of the drilling pump is in the closed state, and the pump is likely to be suffocated. The drilling pump cannot be started.

[0074] Example 4

[0075] See also Figure 8 The method for preventing pump blocking during the start-up process of a drilling pump in a petroleum drilling project according to this embodiment includes the following steps: installing a pressure sensor on a riser to collect the mud pressure LP in the riser in real time and transmitting the pressure signal to a controller. Simultaneously, the controller collects a given voltage control signal V of the electric drilling pump in real time. The controller performs the following process:

[0076] 1) When the drilling pump is started normally, the given voltage control signal of the electric drilling pump is v, and the mud pressure in the riser is lp (lp>0);

[0077] 2) When the drilling pump is started, the given voltage control signal of the electric drilling pump and the mud pressure in the riser are collected in real time;

[0078] 3) Calculate the given voltage control signal V of the electric drilling pump and the mud pressure LP in the riser in real time, and compare them with the given voltage control signal v of the electric drilling pump and the mud pressure lp in the riser in the normal startup state:

[0079] (1) If V ≥ v and LP ≥ lp, it is determined that the high-pressure valve of the drilling pump is in the open state, and the pump will not be suffocated. The drilling pump can be started;

[0080] (2) If V≥v and LP<lp, it is judged that the high-pressure valve of the drilling pump is in the closed state, and the pump is likely to be suffocated. The drilling pump cannot be started.

[0081] Example 5

[0082] See also Figure 5 、 Figure 6 The method for preventing pump blocking during the start-up process of a drilling pump in a petroleum drilling project in this embodiment can be executed by a controller. The process of determining whether the drilling pump is blocking during start-up is as follows:

[0083] A pressure sensor is installed on the water outlet pipeline of the drilling pump to collect the mud pressure BP of the drilling pump in real time and transmit the pressure signal to the controller. A flow rate sensor is installed on the pipeline downstream of the high-pressure valve to collect the mud flow rate S in the high-pressure pipeline in real time and transmit the flow rate signal to the controller.

[0084] 1) When the drilling pump is started normally, the mud pressure of the drilling pump is set to bp (bp>0), and the mud flow rate in the high-pressure pipeline is s;

[0085] 2) When the drilling pump is started, the mud pressure of the drilling pump and the mud flow rate in the high-pressure pipeline are collected in real time;

[0086] 3) Calculate the mud pressure BP of the drilling pump and the mud flow rate S in the high-pressure pipeline in real time, and compare them with the mud pressure BP of the drilling pump and the mud flow rate s in the high-pressure pipeline under normal startup conditions:

[0087] (1) If BP ≥ bp and S ≥ s, it is judged that the high-pressure valve of the drilling pump is in the open state, and there is no suffocation of the pump, and the drilling pump can be started;

[0088] (2) If BP≥bp and S<s, it is judged that the high-pressure valve of the drilling pump is in the closed state, and the pump is likely to be suffocated. The drilling pump cannot be started.

[0089] Example 6

[0090] The method for preventing pump blocking during the startup of a drilling pump in a petroleum drilling project in this embodiment is different from the aforementioned embodiments in that: a normally closed pneumatic valve is installed on the low-pressure return water pipeline of the drilling pump as the low-pressure return water valve of the drilling pump. The opening and closing actuators of the normally closed pneumatic valve are controlled by a controller. When the controller determines that the high-pressure valve of the drilling pump is in a closed state and there is a possibility of blocking the pump, the controller issues a command to open the normally closed pneumatic valve to relieve pressure.

[0091] Example 7

[0092] See also Figure 9 The method for preventing pump blocking during the startup process of a drilling pump in a petroleum drilling project in this embodiment is different from the aforementioned embodiments in that: for a mechanical drilling pump, a normally closed pneumatic valve is installed on the low-pressure return water pipeline of the drilling pump as the low-pressure return water valve 10 of the drilling pump, and a normally open solenoid valve is connected in series to the start-stop control air path of the drilling pump. The normally open solenoid valve is controlled by a controller. When the controller determines that the high-pressure valve of the drilling pump is in a closed state and the pump may be blocked, a control command is issued to open the normally closed pneumatic valve to release pressure. At the same time, the normally open solenoid valve is closed, cutting off the control air path of the drilling pump, so that the drilling pump stops running.

[0093] Example 8

[0094] See also Figure 10 The method for preventing pump blocking during the startup of a drilling pump in a petroleum drilling project in this embodiment is different from the aforementioned embodiments in that: for an electric drilling pump, a normally closed pneumatic valve is installed on the low-pressure return water pipeline of the drilling pump as the low-pressure return water valve 10 of the drilling pump. The controller is associated with the start-stop control system of the electric drilling pump. When it is determined that the high-pressure valve of the drilling pump is in a closed state and the pump may be blocked, the controller issues a control instruction to open the normally closed pneumatic valve to release pressure. At the same time, the start-stop control system of the drilling pump receives the pump stop instruction issued by the controller, causing the drilling pump to stop running.

[0095] The method for preventing pump blocking during the start-up process of a drilling pump in a petroleum drilling project of the present invention can be applied in a combined manner in practice, combining several sets of interrelated parameters for comprehensive comparison and judgment to increase the accuracy and reliability of the judgment.

[0096] Example 9

[0097] This embodiment provides a method for monitoring and determining whether a drilling pump is blocked during startup by comprehensively comparing and judging several parameters. The specific process is as follows:

[0098] 1) Real-time acquisition of the drilling pump speed R;

[0099] 2) Real-time acquisition of the mud flow rate S in the high-pressure pipeline;

[0100] 3) Real-time collection of mud pressure LP in the riser;

[0101] 4) When the drilling pump is started normally, the operating speed of the drilling pump is set to r, the mud flow rate in the high-pressure pipeline is set to s, and the mud pressure in the standpipe is set to lp. The controller makes the following judgments based on the collected drilling pump speed R, the mud flow rate S in the high-pressure pipeline, and the mud pressure LP in the standpipe;

[0102] (1) If R ≥ r and S ≥ s and LP ≥ lp, it is judged that the high-pressure valve of the drilling pump is in the open state, and there is no suffocation of the pump. The drilling pump is started normally;

[0103] (2) If R ≥ r and S < s and LP < lp, it is judged that the high-pressure valve of the drilling pump is in the closed state, and it is predicted that the pump will be suffocated, so the drilling pump is stopped.

Claims

1. A method for preventing pump blocking during the startup of a drilling pump in a petroleum drilling project, wherein when it is determined that pump blocking may occur, the drilling pump is stopped and started, wherein: The process executed by the controller is as follows: 1) Real-time acquisition of the drilling pump speed R; 2) Real-time acquisition of the mud flow rate S in the high-pressure pipeline; 3) When the drilling pump is started normally, the operating speed of the drilling pump is set to r, and the mud flow rate in the high-pressure pipeline is set to s; (1) If R ≥ r and S ≥ s, it is judged that the high-pressure valve of the drilling pump is in the open state, and there is no suffocation of the pump. The drilling pump is started normally; (2) If R ≥ r and S < s, the high-pressure valve of the drilling pump is judged to be in the closed state, and it is predicted that the pump will be suffocated, so the drilling pump is stopped; A normally closed pneumatic valve is installed on the low-pressure return water pipeline of the drilling pump as the low-pressure return water valve of the drilling pump. The normally closed pneumatic valve is controllably connected to the controller. When the controller determines that the pump is suffocated, it issues a control command to open the normally closed pneumatic valve to relieve pressure.

2. The method for preventing pump blocking during the start-up process of a drilling pump in a petroleum drilling project according to claim 1, wherein: When the drilling pump is started normally, the mud pressure in the riser is set to lp; the controller also collects the mud pressure LP in the riser in real time; (1) If R ≥ r and S ≥ s and LP ≥ lp, it is judged that the high-pressure valve of the drilling pump is in the open state, and there is no suffocation of the pump. The drilling pump is started normally; (2) If R ≥ r and S < s and LP < lp, the high-pressure valve of the drilling pump is judged to be in the closed state, and it is predicted that the pump will be suffocated, so the drilling pump is stopped.

3. The method for preventing pump blocking during the start-up process of a drilling pump in a petroleum drilling project according to claim 1 or 2, characterized in that: A mechanical drilling pump is connected in series with a normally open solenoid valve in the start-stop control air path of the drilling pump. The normally open solenoid valve is connected to a controller. When the controller determines that the high-pressure valve of the drilling pump is in a closed state and the pump may be suffocated, it issues a control command to close the normally open solenoid valve, cut off the control air path of the drilling pump, and stop the drilling pump.

4. The method for preventing pump blocking during the start-up process of a drilling pump in a petroleum drilling project according to claim 1 or 2, characterized in that: The electric drilling pump controller is associated with the start-stop control system of the electric drilling pump. When the controller determines that the high-pressure valve of the drilling pump is in a closed state and the pump is about to be suffocated, it sends a pump stop control command to the start-stop control system of the drilling pump to stop the drilling pump.

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