Efficient energy-saving self-adaptive drilling fluid filling system and control method

Abstract

The invention provides an efficient and energy-saving type self-adaptive drilling fluid filling system and a control method, and the system comprises a filling pump channel connecting manifold, a filling pump power motor variable speed control module, a channel matching control module, a parameter acquisition sensor group and a PLC self-adaptive control logic module, the parameter acquisition sensor group acquires operation information of the filling pump and the slurry pump and transmits the information to the PLC self-adaptive control logic module, and the PLC self-adaptive control logic module controls the filling pump and the slurry pump according to the information transmitted by the parameter acquisition sensor group. The channel matching control module is used for controlling the channel connecting manifold between the filling pumps to conduct channel communication and separation of the filling pumps and the slurry suction pipelines of the slurry pumps, and the filling pump power motor variable speed control module is used for controlling the displacement and pressure of the filling pumps. The reliability, the safety and the durability of a filling system are improved, and the positive effect on improvement of the circulating system equipment capacity in the technical field of well drilling is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of oilfield development, and in particular to a high-efficiency, energy-saving, self-adaptive drilling fluid injection system and a control method thereof. Background Art

[0002] During the drilling process, drilling fluid is pressurized by a mud pump, injected into the bottom of the well through a riser and drill pipe, and then returned from the annulus, playing the role of carrying rock, lubricating, stabilizing the wellbore wall, and cooling. However, due to factors such as bubbles and rheological properties of the drilling fluid, as well as problems with the connection method between the mud pump and the mud pump, the drilling fluid cannot be supplied to the mud pump in a sufficient and stable manner under natural conditions, resulting in low mud pump water supply efficiency. Therefore, it is necessary to use a drilling fluid injection pump to pre-pressurize the drilling fluid and then force it into the mud pump suction port to ensure mud pump water supply efficiency and stable output.

[0003] Conventional independent perfusion system manifold such as Figure 1 As shown: 1# priming pump, 2# priming pump and 3# priming pump are independently connected in parallel with three mud pumps. When the priming pumps are needed, 1# priming pump provides pressurized priming for 1# mud pump, 2# priming pump provides pressurized priming for 2# mud pump and 3# priming pump provides pressurized priming for 3# mud pump.

[0004] Conventional drilling fluid injection systems use a single injection pump to independently provide pressurized injection for a single mud pump, resulting in low utilization. Furthermore, the power motor operates at rated speed, making it impossible to change the injection volume and pressure according to the required displacement of the mud pump, resulting in power waste and poor energy efficiency. Furthermore, in extreme situations such as mud pump failure, pipeline leakage, or overflow shut-in requiring emergency pump shutdown, the injection system is prone to damage or premature wear due to pressure buildup, posing safety risks. The main reasons are:

[0005] (1) A drilling fluid injection pump only provides injection function for one mud pump independently. If either the injection pump or the mud pump is damaged, the mud circulation system will be unusable and the utilization rate will be low. At the same time, the workload of the other two mud circulation systems will be increased (generally, a drilling site is equipped with three mud pumps and three drilling fluid injection pumps), which will reduce the fault tolerance of the mud circulation system and reduce the equipment support capability.

[0006] (2) The drilling fluid injection pump is driven by an electric motor and has a constant operating speed. That is, no matter how the mud pump suction demand changes, the injection pump provides the rated maximum injection volume at a larger or maximum power. This not only causes a huge waste of power (the injection pump motor power is 75KW), but also easily causes premature damage to the injection pump due to long-term high pressure and heavy load conditions, thereby increasing direct economic costs.

[0007] (3) In case of extreme working conditions, the pump must be stopped urgently, and the priming pump is manually started and stopped, and the priming pump may not be stopped in time. In this state, the mud pump suction demand is zero, and the priming pump is completely in a high-pressure pump-blocking state, which is very likely to cause damage to the priming pump seal, coupling, and impeller after overload operation;

[0008] (4) Since the injection pump operates at a constant speed, the pressure downstream of the injection pump will change with the changes in load and slurry suction demand, resulting in changes in the vertical pressure, and the change value is difficult to quantify. In complex gas well drilling operations, the vertical pressure is a key parameter for judging overflow display and well pressure process. The change in vertical pressure affects the well control and the judgment of the downhole situation to a certain extent.

[0009] Chinese patent application number CN201720988472.1 describes an intelligent drilling pump priming system, comprising a base and a controller. The base is equipped with pipes connecting the solids control system and the drilling pump. The pipes are equipped with two priming pumps and several sealing valves, which control the pipes to form four drilling fluid channels. A pressure sensor is installed at the connection between the pipes and the drilling pumps, connected to the input of the controller. The output of the controller is connected to the priming pump switch and the sealing valves. This priming system effectively addresses the technical issues of the priming system's inability to automatically control itself, the priming pump's tendency to damage over time, and the resulting energy waste.

[0010] The Chinese patent application with application number CN201010236362.2 involves a combined multi-stage pressure control method, which is applied to oil and natural gas drilling pressure control. A coarse flow control system and a fine flow control system are used in series to control the drilling fluid circulation pressure consumption and adjust the bottomhole pressure. The coarse flow control system consists of several coarse flow channels and a direct current channel in parallel. The coarse flow channels are all composed of an identical automatic flat valve and an identical throttling short circuit in series. The effect is that through the combination of multiple throttling channels in parallel and series, the throttling short circuit throttling pressure difference control range is fixed within a certain range, the drilling fluid circulation pressure is coarsely adjusted to approach or reach the bottomhole pressure control range, and then the fine flow control system fine-tunes the drilling fluid circulation pressure to meet the high-precision bottomhole pressure control requirements.

[0011] The Chinese patent application with application number CN202111203938.X relates to a drilling system, a pressure control and compensating device, and a method. The pressure control and compensating device includes an automatic throttling manifold, internal and external circulation pipelines, a circulation pipeline switching unit, a liquid storage tank, a flow regulating unit, a mud pump, a power system, and a control unit. The inlet of the automatic throttling manifold is used to connect to the wellhead manifold system, and its first outlet is connected to one of the inlet of the external circulation pipeline and the inlet of the internal circulation pipeline through the circulation pipeline switching unit. Its second outlet is connected to the outlet of the internal circulation pipeline, and the outlet of the external circulation pipeline is used to connect to a liquid-gas separator; the liquid storage tank and the mud pump are arranged on the internal circulation pipeline; the power system is connected to the mud pump to drive the mud pump; the control unit is connected to the power system, the mud pump, the automatic throttling manifold unit, the circulation pipeline switching unit, and the flow regulating unit to control the wellhead pressure. This invention can be used for fine control of wellhead pressure in processes such as drilling and cementing.

[0012] Chinese patent application number CN201020108986.1 relates to a precise drilling annulus pressure control system for oil and gas field drilling. The system comprises an automatically controlled choke manifold, a backpressure compensation device, a flow rate monitoring device, a bottomhole pressure measurement-while-drilling device, and a data acquisition and control system. The hydraulic calculation module calculates the required wellhead backpressure data required to maintain the bottomhole pressure at a set value in real time and transmits it to the control system. The automatic control system then adjusts the choke valve opening based on this backpressure value. By monitoring pressure, the system can respond to changing conditions and continuously adjust the choke valve to maintain backpressure, or activate the backpressure compensation device to supply drilling fluid to the automatic choke manifold to maintain wellhead backpressure. The system maintains relatively stable bottomhole pressure under both dynamic and static conditions, boasting a high degree of automation, precise control, and timely adjustments. This improves the safety and reliability of managed pressure drilling operations and is suitable for both offshore and onshore managed pressure drilling.

[0013] The above existing technologies are significantly different from the present invention and fail to solve the technical problem we want to solve. Therefore, we have invented a new high-efficiency and energy-saving adaptive drilling fluid injection system and control method. Summary of the Invention

[0014] The purpose of the present invention is to provide a high-efficiency, energy-saving, adaptive drilling fluid injection system and control method that improves the reliability, safety and durability of the injection system and has a positive effect on improving the equipment capacity of the circulation system in the field of oil and gas drilling technology.

[0015] The objectives of the present invention can be achieved through the following technical measures: an efficient and energy-saving adaptive drilling fluid injection system, which includes a channel connecting manifold between injection pumps, an injection pump power motor speed control module, a channel matching control module, a parameter acquisition sensor group and a PLC adaptive control logic module. The parameter acquisition sensor group collects the operating information of the injection pump and the mud pump, and transmits this information to the PLC adaptive control logic module. The PLC adaptive control logic module controls the channel connecting manifold between the injection pumps according to the information transmitted by the parameter acquisition sensor group through the channel matching control module to connect and disconnect the channels of multiple injection pumps and multiple mud pump suction pipelines, and controls the displacement and pressure of the injection pump through the injection pump power motor speed control module.

[0016] The purpose of the present invention can be achieved through the following technical measures: the channel connecting manifold between the perfusion pumps includes a connecting pipeline, multiple channel switching pneumatic ball valves, multiple swing check valves and multiple butterfly valves, the multiple channel switching pneumatic ball valves include multiple first position ball valves, multiple second position ball valves and multiple third position ball valves, the connecting pipeline includes multiple slurry suction pipelines, multiple perfusion pump water supply pipelines, multiple perfusion pipelines, and multiple perfusion branches, each of the butterfly valves is connected to the corresponding slurry suction pipeline through a flange, the slurry suction pipeline is located between its corresponding mud tank and the corresponding mud pump, each of the first position ball valves is connected to the corresponding perfusion pump water supply pipeline through a flange, the perfusion pump water supply pipeline One end of the water pipeline is connected to the corresponding water inlet of the injection pump through a flange, and the other end is welded in parallel with the slurry suction pipeline. The slurry outlet of the injection pump is connected to the corresponding swing check valve through a flange, and the downstream of the swing check valve is connected to the corresponding second-position ball valve. The swing check valve and the second-position ball valve are located on the injection pipeline. The injection pipeline and the slurry suction pipeline are welded in parallel, and the interface is located between the butterfly valve and the mud pump on the slurry suction pipeline. The injection branch is welded in parallel with the injection pipeline, and the interface is located between the swing check valve and the second-position ball valve. The corresponding third-position ball valve is connected to the injection branch through a flange.

[0017] The channel connecting manifold between the perfusion pumps also includes a soft connection, which includes a plurality of flexible rubber soft joints. The connecting pipeline also includes a plurality of parallel pipelines. One end of a certain perfusion branch is welded in parallel with a certain perfusion pipeline, and the other end is welded with a 90° arc elbow with a flange. The elbow flange is connected to a flexible rubber soft joint, and then connected to a certain parallel pipeline; one end of another perfusion branch is welded in parallel with another perfusion pipeline, and the other end is welded with a 90° arc elbow with two flanges. A T-shaped elbow with a flange, one end of the T-shaped elbow is connected to another flexible rubber joint, and then connected to a parallel pipeline, and the other end of the T-shaped elbow is connected to another flexible rubber joint, and then connected to another parallel pipeline; one end of another perfusion branch is welded in parallel with another perfusion pipeline, and the other end is welded with a 90° arc elbow with a flange, and the elbow flange is connected to another flexible rubber joint, and then connected to another parallel pipeline.

[0018] Two fixed brackets are installed on each parallel pipeline. A square bottom plate is welded at one end of the bracket and connected to the solid ground or mud pump base with bolts. A pressure plate is welded at the other end. A pressure plate of the same size is then used to fix the parallel pipeline with bolts. The two fixed points must be located between the two flexible rubber joints at both ends of the parallel pipeline.

[0019] The parameter acquisition sensor group includes multiple pressure sensors, multiple injection pump speed sensors, multiple mud pump speed sensors, multiple vibration sensors, and multiple valve switch position sensors. Each of the injection pump speed sensors is located on its corresponding injection pump coupling housing to monitor the rotational speed of the injection pump motor and transmit the rotational speed information of the injection pump motor to the PLC adaptive control logic module. Each of the mud pump speed sensors is located on its corresponding mud pump to monitor the rotational speed of the mud pump motor and transmit the rotational speed information of the mud pump motor to the PLC adaptive control logic module. Each of the vibration sensors is located on its corresponding The air bag pressure gauge protective cover base bolt of the mud pump is used to collect the vibration frequency and vibration intensity of the mud pump, and transmit the vibration information to the PLC adaptive control logic module. Each of the pressure sensors is located between the butterfly valve for slurry suction on the slurry suction pipeline and the slurry suction port of the mud pump, collects pressure information and transmits it to the PLC adaptive control logic module. Each of the valve switch position sensors is connected to the actual positions of the full opening and full closing of the corresponding channel switching pneumatic ball valve and the butterfly valve, detects the switch position status of the valve, and transmits the switch position status information to the PLC adaptive control logic module.

[0020] The variable speed control module of the power motor of the perfusion pump includes multiple frequency conversion controllers respectively connected to the perfusion pumps. The frequency conversion controllers are connected to the PLC adaptive control logic module and adjust the start and stop and speed of the corresponding perfusion pump according to the control signal transmitted by the PLC adaptive control logic module.

[0021] The channel matching control mechanism includes multiple electromagnetic reversing valves, and the multiple electromagnetic reversing valves are connected to the corresponding channel switching pneumatic ball valves and the butterfly valves. Under the control of the PLC adaptive control logic module, the opening or closing of the channel switching pneumatic ball valves and the butterfly valves connected to them are controlled, and the valve switch position sensor is used to determine whether the opening or closing action is completed.

[0022] The high-efficiency and energy-saving adaptive drilling fluid injection system also includes a power supply, which includes 380V and 220V power supplies. The power supply is connected to multiple frequency converters to provide them with 380V power. The multiple frequency converters then provide power to the corresponding injection pumps respectively. The power supply is connected to multiple electromagnetic reversing valves and the PLC adaptive control logic module to provide 220V power.

[0023] The PLC adaptive control logic module includes a power module, a CPU module, a digital input module, a digital output module, an analog input module, and a communication interface. The power module converts the received 220V AC into 24V DC to power the PLC adaptive control logic module. The digital input module is connected to the plurality of valve switch position sensors, receives valve switch position status information, and transmits it to the CPU module. The digital output module is connected to the plurality of solenoid reversing valves, receives control signals transmitted from the CPU module, and transmits the control signals to the plurality of solenoid reversing valves to control the opening and closing and on-off of the plurality of solenoid reversing valves. The analog input module is connected to the plurality of pressure sensors, the plurality of priming pump speed sensors, the plurality of mud pump speed sensors, and the plurality of vibration sensors, converts the signals transmitted by these sensors into universal unit values, and transmits them to the CPU module. The communication interface is connected to the plurality of frequency conversion controllers, and transmits the control signals transmitted by the CPU module to the plurality of frequency conversion controllers to adjust the start, stop, and speed of the priming pumps corresponding to the frequency conversion controllers.

[0024] The purpose of the present invention can also be achieved by the following technical measures: a high-efficiency energy-saving adaptive drilling fluid perfusion method, which adopts a high-efficiency energy-saving adaptive drilling fluid perfusion system, including:

[0025] Step 1: The parameter acquisition sensor group collects the operation information of the priming pump and the mud pump, and transmits this information to the PLC adaptive control logic module;

[0026] Step 2: The PLC adaptive control logic module collects information transmitted by the sensor group based on the parameters, and controls the channel connection manifold between the grouting pumps through the channel matching control module to connect and disconnect the channels between the multiple grouting pumps and the multiple mud pump suction pipelines;

[0027] Step 3: The PLC adaptive control logic module controls the displacement and pressure of the perfusion pump through the perfusion pump power motor speed control module according to the information transmitted by the parameter acquisition sensor group.

[0028] The purpose of the present invention can also be achieved by the following technical measures:

[0029] In step 1, the injection pump speed sensor monitors the speed of the injection pump motor and transmits the speed information of the injection pump motor to the PLC adaptive control logic module. The mud pump speed sensor monitors the speed of the mud pump motor and transmits the speed information of the mud pump motor to the PLC adaptive control logic module. The vibration sensor collects the vibration frequency and vibration intensity of the mud pump and transmits the vibration information to the PLC adaptive control logic module. The pressure sensor collects the pressure information on the slurry suction pipeline and transmits it to the PLC adaptive control logic module. The valve switch position sensor detects the switch position status of the channel switching pneumatic ball valve and butterfly valve, and transmits the switch position status information to the PLC adaptive control logic module.

[0030] In step 2, the PLC adaptive control logic module switches the pneumatic ball valve and butterfly valve to open or close according to the information transmitted by the parameter acquisition sensor group through the electromagnetic reversing valve control channel, and determines whether the opening or closing action is completed through the valve switch position sensor.

[0031] In step 3, the PLC adaptive control logic module controls the start and stop and speed of the perfusion pump through the frequency conversion controller according to the information transmitted by the parameter acquisition sensor group.

[0032] The high-efficiency, energy-saving, adaptive drilling fluid injection system and control method of the present invention enable channel connection and switching between one to three injection pumps to inject any one to three mud pumps, adaptively control the injection pressure and number of the injection pumps according to the total slurry suction volume demanded by the mud pumps, and achieve emergency shutdown and rapid restart of the injection pumps in extreme situations. This solves the problems of low energy efficiency, low utilization, and high failure rate of injection pumps, achieving efficient matching, cost reduction, energy conservation, and improved safety and equipment life. The present invention improves the automation level of circulation systems in the field of oil and gas drilling technology, improves the utilization efficiency of the injection system, reduces the power consumption of the electric injection system, achieves cost reduction and energy conservation, and improves the reliability, safety, and durability of the injection system, playing a positive role in improving the equipment capabilities of circulation systems in the field of oil and gas drilling technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 This is a schematic diagram of the conventional independent perfusion system manifold;

[0034] Figure 2 A flow chart of an adaptive perfusion system manifold in a specific embodiment of the present invention;

[0035] Figure 3 Schematic diagram of a pipe manifold structure for connecting channels between perfusion pumps in a specific embodiment of the present invention;

[0036] Figure 4 A schematic diagram of a gas circuit and switches of an adaptive perfusion system manifold in a specific embodiment of the present invention;

[0037] Figure 5 This is a diagram showing the installation position of the manifold sensor of the adaptive perfusion system in a specific embodiment of the present invention;

[0038] Figure 6 FIG. 1 is a schematic diagram of the control and power supply principle of the adaptive perfusion system in a specific embodiment of the present invention. DETAILED DESCRIPTION

[0039] It should be noted that the following detailed descriptions are exemplary and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which the present invention belongs.

[0040] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations and / or combinations thereof.

[0041] A high-efficiency and energy-saving adaptive drilling fluid injection system includes an injection pump inter-channel connecting pipe manifold, an injection pump power motor speed control module, a channel matching control module, a parameter acquisition sensor group and a PLC adaptive control logic module.

[0042] The variable speed control module of the power motor of the perfusion pump is used for closed-loop or manual control of the motor speed. The channel matching control module is used to control the automatic switching of each channel. The PLC adaptive control logic module is used for closed-loop or manual control of the pressure or displacement of the perfusion pump through the PID control of the PLC.

[0043] The parameter acquisition sensor group includes pump speed sensors RS 1, RS2, RS3, RS4, RS5, RS6 and vibration sensor SS 1. SS2, SS3 and pressure sensors PT1, PT2, PT3 and position sensors. The injection pump speed sensor is located on the coupling housing of each injection pump, monitors the speed of the injection pump motor, and is connected to the PLC analog input module through a signal line; the mud pump speed sensor is located on the inside of the mud pump belt driven pulley guard or at a position where the mud pump body can detect the rotation of the driven pulley, monitors the speed of the mud pump motor, and is connected to the PLC analog input module through a signal line; the vibration sensor is located on the base bolt of the nitrogen buffer bag pressure gauge protection cover of each mud pump or is fixed to the top of the nitrogen buffer bag by magnetic attraction, used to collect the vibration frequency and vibration intensity of the mud pump, and is connected to the PC analog input module through a signal line; the pressure sensor is located between the slurry suction butterfly valve on the slurry suction pipeline and the slurry suction port of the mud pump; the position sensor is located at the actual position of the fully open and fully closed positions of the pneumatic butterfly valve and the ball valve, and is connected to the PLC digital input module through a signal line, used to detect the switch position status of the pneumatic butterfly valve and the pneumatic butterfly valve.

[0044] The inter-channel connection manifold for the irrigation pumps includes connecting pipelines, flexible connectors, and channel switching pneumatic ball valves and butterfly valves. The irrigation pump power motor speed control module includes a power motor, a high-load frequency converter, and a control unit. The channel matching control mechanism includes an electromagnetic reversing valve. The parameter acquisition sensor group includes a pressure sensor, a pump speed sensor, a motor speed sensor, a vibration sensor, and a valve switch position sensor. The PLC adaptive control logic module includes an irrigation pump channel switching control logic unit, a speed control logic unit, an adaptive irrigation control logic unit, and an emergency stop and rapid start control logic unit. Furthermore, the adaptive irrigation control logic unit uses a PID closed-loop control mechanism to automatically control irrigation pressure or irrigation displacement based on signals from the pressure sensor, vibration sensor, pump speed sensor, and motor speed.

[0045] The present invention not only realizes the interconnection of three injection pumps and three mud pumps to meet more flexible and efficient injection needs, but also automatically and accurately matches the injection needs through adaptive control, directly saves electricity consumption, and improves the service life and support capability of key equipment.

[0046] In the present invention, the channel connecting manifold between the grouting pumps includes connecting pipelines, soft connections, and channel switching pneumatic ball valves and butterfly valves, which realize the channel connection, isolation, and shock absorption functions of the slurry suction pipelines of the three grouting pumps and the three mud pumps, and can realize switching and isolation between natural water supply and grouting water supply. The installed soft connection can adjust the installation position and realize buffering and shock absorption functions, reducing fatigue damage to the pipeline welding points. Moreover, through valve switching, any grouting pump or mud pump can be repaired without interfering with each other and continuous grouting can be achieved.

[0047] In the present invention, the speed control module of the perfusion pump power motor includes a frequency conversion controller, which automatically or manually controls the speed of the perfusion pump motor by collecting pressure parameters and speed parameters. The motor and the perfusion pump head are connected through a coupling and have the same speed, thereby realizing the control of the displacement and pressure of the perfusion pump.

[0048] The present invention can realize the rotation speed monitoring and speed control of the perfusion pump motor. By monitoring the motor rotation speed and controlling the frequency converter frequency through the PLC controller, the motor rotation speed can be controlled and monitored.

[0049] In the present invention, the channel matching control mechanism includes a solenoid directional valve. In manual mode, it is manually actuated; in automatic mode, a PLC sends an opening / closing signal to the corresponding solenoid directional valve, controlling the opening and closing of the solenoid directional valve and the direction of the passage. This allows compressed gas to flow through the air path connecting the solenoid directional valve to the pneumatic ball valve and butterfly valve, achieving automatic opening and closing of the valve. When the pneumatic ball valve and butterfly valve reach a predetermined position, a position sensor detects the position signal and sends it to the PLC, which then terminates the control signal to complete the valve control action. This allows the various channels to be connected and isolated from each other.

[0050] The present invention can realize remote control and position monitoring of valves. Through PLC control logic, digital switch quantity is output to control the air path switching of electromagnetic reversing valve, thereby realizing switch control of pneumatic ball valve and butterfly valve. Position sensor is used as signal feedback. When the switch is in place, the position sensor signal is triggered to input PLC. PLC ends control and monitors in real time whether the valve is shifted, triggering alarm or automatically restoring to the required switch position.

[0051] As a signal acquisition unit for adaptive control, it can realize adaptive control of the motor speed and injection pressure or injection displacement of the priming pump according to the total displacement of the mud pump;

[0052] In the present invention, the PLC adaptive control logic module includes an irrigating pump channel switching control logic unit, a speed control logic unit, an adaptive irrigating control logic unit, and an emergency stop and rapid start control logic unit. The PLC records the cumulative usage time of each irrigating pump and, based on the irrigating demand, automatically switches and adjusts the start and stop of the irrigating pumps, achieving balanced usage of the three irrigating pumps while fully meeting the irrigating demand and extending the service life of the three irrigating pumps. The adaptive irrigating control logic is implemented through PID closed-loop control, automatically controlling the irrigating pressure and motor speed based on signals from pressure sensors, vibration sensors, pump speed sensors, and motor speed, achieving high efficiency and energy saving. The irrigating pump's pressure and displacement, as well as whether to perform an emergency stop or rapid start, are determined by monitoring the slurry pump's speed and speed change slope.

[0053] Perfusion pump channel switching control logic unit: The PLC switches channels through manual instructions or preset conditional judgments. Manual switching involves manually inputting instructions to the PLC. For example, clicking the "1# Butterfly Valve Open" button on the operation interface or physical interface will cause the PLC to energize the solenoid reversing valve that controls the opening of the 1# Butterfly Valve. This uses the air source to push the 1# Butterfly Valve toward the opening direction. When the PLC detects a signal from the position sensor indicating the 1# Butterfly Valve is fully open, it immediately de-energizes the solenoid reversing valve, thereby completing the opening of the 1# Butterfly Valve. Preset condition judgments involve the PLC automatically determining which pneumatic butterfly valves or ball valves should be opened and closed based on preset channel switching conditions. The program automatically determines the sequence in which each valve should be opened or closed and detects the status of each valve. If the PLC detects through the pressure sensor that the current injection pressure is lower than the set lower pressure limit, or detects through the mud pump speed sensor that the injection displacement is lower than the set displacement, and at the same time detects through the injection pump speed sensor that only the 1# injection pump is running and has reached the maximum speed of the 1# injection pump, but still cannot meet the required pressure, then at this time the 2# injection pump injection channel will be automatically connected to the water supply channel according to the preset program, and then the 2# injection pump will be soft-started to make the entire injection system reach the required pressure or displacement.

[0054] Speed ​​control logic unit: First, after the system is installed, in the displacement automatic follow-up mode, the theoretical calculation and measured correction coefficient are used to find the corresponding displacement of the priming pump through the theoretical calculation and the measured correction coefficient. Then, if the PLC detects that the current displacement has increased through the pump speed sensor, and the priming pump speed sensor detects that the current priming displacement cannot keep up with the displacement of the mud pump, the PLC will send a command to increase the frequency converter frequency and thus increase the speed of the priming pump through the communication line connected to the frequency converter. At the same time, the PLC monitors and calculates in real time whether the current priming pump displacement meets the preset conditions or not, and the closed-loop control determines whether the speed needs to be increased or decreased. This automatic closed-loop control is always maintained, so that the displacement of the priming pump meets the preset required displacement in real time. In addition, in the constant pressure control mode, the PLC monitors in real time whether the priming pressure of the running priming pump meets the preset priming required pressure, and adjusts the speed of the priming pump in real time through the automatic closed-loop control program to make the actual pressure equal to the required pressure or stabilize in a similar range.

[0055] Adaptive injection control logic unit: The entire injection system uses the data sent back by various sensors and the preset automatic control program to automatically determine when to use several injection pumps, automatically control the speed of each injection pump, and automatically execute the opening and closing of each valve. For example, in the natural water supply state (that is, the mud pump sucks mud by its own self-priming ability), the PLC monitors the data of the mud pump vibration sensor in real time and judges whether the mud pump water supply is good according to the threshold value preset in the PLC. If it is good, no injection pump will be operated. If the data collected from the vibration sensor exceeds the preset threshold value, the PLC program will determine that the mud pump water supply is poor at this time and the injection pump needs to be used to compensate for the water supply. For example, if you want to start the 1# priming pump and priming the 1# and 2# mud pumps at the same time, the PLC will compare the switch states of the valves preset in the program to use the 1# priming pump based on the position sensor signals of each valve. If they are consistent, the frequency conversion signal will be sent to the frequency converter to soft-start the 1# priming pump. After starting, the priming system will be monitored in real time to see if it meets the preset conditions to control the speed of the priming pump, the number of priming pumps started, and whether the priming pump is used or not, ultimately achieving energy saving effects.

[0056] Emergency stop and quick start control logic unit: The emergency stop control logic is that when the injection pump is running, the PLC monitors the speed of the mud pump in real time (for example, once per second), and calculates the speed change rate of the pump in real time through a preset program. If it is suddenly detected that the speed change rate of the mud pump exceeds the preset rate, and at the same time, the required displacement of the mud pump calculated by the current speed of the mud pump is far lower than the current injection displacement, the PLC will determine that the mud pump has been artificially decelerated rapidly. In order to avoid the pressure of the injection pump, the PLC will immediately send a stop signal to the frequency converter of the running injection pump; the quick start control logic is that, for example, one injection pump is currently working, and the PLC is also collecting various sensor data in real time. It suddenly detects that in a very short time In the case of a situation where the mud pump speed is increased artificially or another mud pump is started, the current priming pump cannot meet the demand. At this time, the PLC will calculate the amount of displacement needed to meet the current priming demand based on the mud pump speed sensor data, priming pressure data, and priming pump speed data, according to the preset conditions. The PLC determines the speed of the priming pump that is still in the stopped state based on the calculated value. For example, if it is calculated that the speed needs to be opened to 1000 rpm to meet the demand, the PLC will give the priming pump a start signal and immediately give a speed command of 1000 rpm after completing the soft start of the priming pump. The priming pump will immediately increase the speed to 1000, which may take 2-3 seconds. Then, when the speed is increased to 1000, the actual priming is calculated in real time to see if it matches the demand. The automatic control logic will then adjust the priming pump speed slightly to meet the demand. This is a quick start. It is faster and more direct than starting slowly, bit by bit, and comparing whether it is satisfactory or not during the process of increasing the speed.

[0057] The following are several specific embodiments of the present invention:

[0058] Example 1

[0059] In a specific embodiment 1 of the present invention, the grouting system of the present invention achieves high efficiency and energy saving. The valve group and pipeline are used in parallel between the 1# grouting pump, the 2# grouting pump and the 3# grouting pump to achieve that the three grouting pumps can provide grouting needs for any of the three mud pumps. Moreover, by switching the valves, any grouting pump or mud pump can be repaired without interfering with each other and continuous grouting can be achieved. The pipeline design is as follows: Figure 2 shown.

[0060] The (1# butterfly valve) is connected to the (1# slurry suction pipeline) via a flange. The (1# slurry suction pipeline) is located between the mud tank and the 1# mud pump. The (1Q01 ball valve) is connected to the (1# injection pump water supply pipeline) via a flange. One end of the (1# injection pump water supply pipeline) is connected to the 1# injection pump water inlet via a flange, and the other end is welded in parallel with the (1# slurry suction pipeline). The slurry outlet of the 1# injection pump is connected to a swing check valve via a flange. The downstream of the swing check valve is connected to the (1Q02 ball valve). The swing check valve and the (1Q02 ball valve) are located on the (1# injection pipeline). The (1# injection pipeline) and the (1# slurry suction pipeline) are welded in parallel. The interface is located between the (1# butterfly valve) and the 1# mud pump on the (1# slurry suction pipeline). (1# injection branch) and (1# injection pipeline) are welded in parallel, and the interface is located between the swing check valve and (1Q02 ball valve). (1Q03 ball valve) is connected to (1# injection branch) through a flange.

[0061] The (2# butterfly valve) is connected to the (2# slurry suction pipeline) via a flange. The (2# slurry suction pipeline) is located between the mud tank and the 2# mud pump. The (2Q01 ball valve) is connected to the (2# injection pump water supply pipeline) via a flange. One end of the (2# injection pump water supply pipeline) is connected to the 2# injection pump water inlet via a flange, and the other end is welded in parallel with the (2# slurry suction pipeline). The slurry outlet of the 2# injection pump is connected to a swing check valve via a flange. The downstream of the swing check valve is connected to the (2Q02 ball valve). The swing check valve and the (2Q02 ball valve) are located on the (2# injection pipeline). The (2# injection pipeline) and the (2# slurry suction pipeline) are welded in parallel. The interface is located between the (2# butterfly valve) and the 2# mud pump on the (2# slurry suction pipeline). (2# injection branch) and (2# injection pipeline) are welded in parallel, and the interface is located between the swing check valve and (2Q02 ball valve). (2Q03 ball valve) is connected to (2# injection branch) through a flange.

[0062] The (3# butterfly valve) is connected to the (3# slurry suction pipeline) via a flange. The (3# slurry suction pipeline) is located between the mud tank and the 3# mud pump. The (3Q01 ball valve) is connected to the (3# injection pump water supply pipeline) via a flange. One end of the (3# injection pump water supply pipeline) is connected to the 3# injection pump water inlet via a flange, and the other end is welded in parallel with the (3# slurry suction pipeline). The slurry outlet of the 3# injection pump is connected to a swing check valve via a flange. The downstream of the swing check valve is connected to the (3Q02 ball valve). The swing check valve and the (3Q02 ball valve) are located on the (3# injection pipeline). The (3# injection pipeline) and the (3# slurry suction pipeline) are welded in parallel. The interface is located between the (3# butterfly valve) and the 3# mud pump on the (3# slurry suction pipeline). (3# injection branch) and (3# injection pipeline) are welded in parallel, and the interface is located between the swing check valve and (3Q02 ball valve). (3Q03 ball valve) is connected to (3# injection branch) through a flange.

[0063] One end of the (1# perfusion branch) is welded in parallel with the (1# perfusion pipeline), and the other end is welded with a 90° curved elbow with a flange. The elbow flange is connected to a flexible rubber joint, and then connected to the (1-2# parallel pipeline). One end of the (2# perfusion branch) is welded in parallel with the (2# perfusion pipeline), and the other end is welded with a T-shaped elbow with two flanges. One end of the T-shaped elbow flange is connected to a flexible rubber joint, and then connected to the (1-2# parallel pipeline). The other end of the T-shaped elbow flange is connected to a flexible rubber joint, and then connected to the (2-3# parallel pipeline). One end of the (3# perfusion branch) is welded in parallel with the (3# perfusion pipeline), and the other end is welded with a 90° curved elbow with a flange. The elbow flange is connected to a flexible rubber joint, and then connected to the (2-3# parallel pipeline).

[0064] Two fixed brackets are installed on (1-2# parallel pipelines), with a square bottom plate welded to one end of the bracket and bolted to the solid ground or mud pump base, and a pressure plate welded to the other end, and then a pressure plate of the same size is used to fix (1-2# parallel pipelines) by bolts. The two fixed points must be located between the flexible rubber joints at both ends of (1-2# parallel pipelines); two fixed brackets are installed on (2-3# parallel pipelines), with a square bottom plate welded to one end of the bracket and bolted to the solid ground or mud pump base, and a pressure plate welded to the other end, and then a pressure plate of the same size is used to fix (2-3# parallel pipelines) by bolts. The two fixed points must be located between the flexible rubber joints at both ends of (2-3# parallel pipelines).

[0065] The channel connecting manifold structure between the perfusion pumps includes: (1) manual ball valve, (2) swing check valve, (3) pneumatic ball valve, (4) pneumatic ball valve, (5) flexible connector, (6) fixed bracket, (7) connection method and position between 1 to 6, such as Figure 3 shown.

[0066] In order to achieve high efficiency, safety and automatic control, pneumatic ball valves and pneumatic reversing valves are used in the priming pump room to achieve automatic switching and control, and switch position sensors are set to detect the valve status and whether they are in place. The 1# priming pump valve group controls the 1# pneumatic butterfly valve, 1Q02 ball valve, and 1Q03 ball valve respectively. The 2# priming pump valve group controls the 2# pneumatic butterfly valve, 2Q02 ball valve, and 2Q03 ball valve respectively. The 3# priming pump valve group controls the 3# pneumatic butterfly valve, 3Q02 ball valve, and 3Q03 ball valve respectively. The connection principle is as follows Figure 4 shown.

[0067] like Figure 4As shown in the figure, the 1# injection pump valve group, the 2# injection pump valve group, and the 3# injection pump valve group are respectively composed of 3 manual and automatic electromagnetic reversing valves of the same model, with a total of 9 valves. They are connected to the pneumatic butterfly valves and pneumatic ball valves of the 1#, 2#, and 3# injection pumps through air circuits (the air supply source is provided by an air compressor with an air source pressure of 0.65~1.0MPa). They are equipped with manual reversing handles for emergency operation or manual mode operation; the pneumatic butterfly valves and pneumatic ball valves are installed with position sensors and indicator lights. The green indicator light is on when the valve is fully open, and the red indicator light is on when the valve is fully closed. The line is also connected to the PLC digital input terminal (DI) to realize the valve position opening and closing status detection of the valve automatic control and the control of the electromagnetic reversing valve.

[0068] like Figure 5 As shown, in the present invention, the parameter acquisition sensor group includes a pressure sensor, a mud pump speed sensor, an injection pump speed sensor, a vibration sensor, and a valve switch position sensor to realize data acquisition and adaptive control signal feedback, pump speed sensors RS 1, RS2, RS3, RS4, RS5, RS6 and vibration sensors SS 1, SS2, SS3 and pressure sensors PT 1, PT2, PT3 and position sensor. The injection pump speed sensor is located on the coupling housing of each injection pump to monitor the speed of the injection pump motor and is connected to the PLC analog input module through a signal line; the vibration sensor is located on the base bolt of the air bag pressure gauge protective cover of each mud pump and is used to collect the vibration frequency and vibration intensity of the mud pump and is connected to the PC analog input module through a signal line; the pressure sensor is located between the slurry suction butterfly valve on the slurry suction pipeline and the slurry suction port of the mud pump; the position sensor is located at the actual position of the full open and full closed positions of the pneumatic butterfly valve and the ball valve, and is connected to the digital input module of the PLC through a signal line to detect the switch position status of the pneumatic butterfly valve and the pneumatic butterfly valve.

[0069] Example 2

[0070] In a specific embodiment 2 of the present invention, as Figure 6As shown, the power supply includes 380V and 220V power supplies. The 380V power supply is connected in parallel to three frequency converters, which in turn provide power to the perfusion pumps. The 220V power supply is connected to the PLC and the solenoid reversing valve group. The PLC controller includes at least a power module (220V AC to 24V DC), a CPU module, a digital input module (DI), a digital output module (DO), an analog input module (AI), and a communication interface (compatible with the frequency converter, such as RS485 communication). The digital input module (DI) is connected to the pneumatic valve position sensor through a two-wire signal line to receive the opening and closing signal of the position sensor, specifically an on-off signal; the digital output module (DO) is connected to the manual-automatic electromagnetic reversing valve through a signal line to control the opening and closing and on-off of the manual-automatic electromagnetic reversing valve; the analog input module (AI) is connected to the injection pump speed sensors RS1, RS2, RS3, the mud pump speed sensors RS4, RS5, RS6 and the vibration sensors SS1, SS2, SS3 and the pressure sensors PT1, PT2, PT3 through signal lines, and converts the signal values ​​into universal unit values, which are used to collect the values ​​of each sensor to provide boundary conditions for the automatic control program; the communication interface is connected to the frequency converter (RS485 communication is preferred) to output control and monitor frequency converter parameters.

[0071] To achieve automatic control, this system uses pressure sensors, position sensors, speed sensors, and vibration sensors to continuously monitor and collect parameters, including:

[0072] "Speed ​​sensor RS 1" monitors the speed of the 1# injection pump motor, "Speed ​​sensor RS2" monitors the speed of the 2# injection pump motor, "Speed ​​sensor RS3" monitors the speed of the 3# injection pump motor, "Speed ​​sensor RS4" monitors the speed (pump stroke) of the 1# mud pump, "Speed ​​sensor RS5" monitors the speed (pump stroke) of the 2# mud pump, and "Speed ​​sensor RS6" monitors the speed (pump stroke) of the 3# mud pump;

[0073] "Pressure sensor PT 1" monitors the pressure at the water end of 1# mud pump, "pressure sensor PT2" monitors the pressure at the water end of 2# mud pump, and "pressure sensor PT3" monitors the pressure at the water end of 3# mud pump;

[0074] "Vibration sensor SS 1" monitors the vibration frequency and amplitude of 1# mud pump, "vibration sensor SS2" monitors the vibration frequency and amplitude of 2# mud pump, and "vibration sensor SS3" monitors the vibration frequency and amplitude of 3# mud pump.

[0075] The present invention adopts PLC control + inverter control, with the inverter replacing the conventional soft start component. The PLC collects pressure signals, speed (pump stroke) signals, vibration signals and inverter feedback signals through the AI ​​module, collects valve position signals through the DI module, outputs inverter control signals through the AO module, and outputs pneumatic electromagnetic reversing valve control signals through the DO module. Among them, the 1# inverter controls the start, stop and speed change of the 1# irrigation pump motor, the 2# inverter controls the start, stop and speed change of the 2# irrigation pump motor, and the 3# inverter controls the start, stop and speed change of the 3# irrigation pump motor.

[0076] Example 3

[0077] In a specific embodiment 3 of the present invention, the control mode is divided into a constant pressure perfusion mode, a displacement automatic following mode, an adaptive control mode and a manual control mode. The constant pressure control mode is to set a constant pressure perfusion, and the system automatically adjusts and outputs the frequency converter frequency to achieve pressure closed-loop control, and the specific method is the PID closed-loop control of the PLC; the displacement automatic following mode is to derive the relationship coefficient between the fixed perfusion pump displacement (Q) and the motor input frequency (f) based on the relationship that the perfusion pump displacement (Q) is proportional to the square of the motor speed (R), and the motor speed is proportional to the motor input frequency (f) below 50Hz. The system automatically adjusts and outputs the frequency converter frequency to keep the perfusion pump displacement in real time. The displacement is equal to or slightly greater than the theoretical displacement of the mud pump, realizing closed-loop control of displacement, and the specific method is PID closed-loop control of PLC; in adaptive control mode, the system automatically detects the mud pump speed (pump stroke), mud pump vibration signal (frequency and amplitude), number of mud pumps in use and pressure and speed of the priming pump, adaptively starts and stops, matches and optimizes the number of priming pumps started and the working speed, and automatically optimizes and switches the priming pumps and channels according to the set conditions to realize complete closed-loop control; in manual control mode, the channel and motor speed of the priming pump are manually controlled.

[0078] Automatic switching control method of perfusion pump channels:

[0079] In the default system, the 1# butterfly valve, 2# butterfly valve, and 3# butterfly valve are all in the closed state, and the 1Q01 ball valve, 2Q01 ball valve, and 3Q01 ball valve are in the normally open state; obtain the maximum displacement (Q01MAX) and rated speed (RPM01) of the 1# filling pump, the maximum displacement (Q02MAX) and rated speed (RPM02) of the 2# filling pump, and the maximum displacement (Q03MAX) and rated speed (RPM03) of the 3# filling pump from the nameplate; obtain the cylinder sleeve diameter (D01) and stroke length (L01) of the 1# mud pump, the cylinder sleeve diameter (D02) and Stroke length (L02), 3# mud pump cylinder diameter (D03), stroke length (L03); obtain speed (SPM01) from 1# mud pump speed (pump stroke) sensor, speed (SPM02) from 2# mud pump speed (pump stroke) sensor, speed (SPM03) from 3# mud pump speed (pump stroke) sensor, and calculate the real-time displacement of 1# mud pump (Q01), 2# mud pump real-time displacement (Q02), and 3# mud pump real-time displacement (Q03) according to the formula: Q = 0.0393*D*D*L*(SPM);

[0080] (1) Control method for switching from 1# priming pump supplying 1# mud pump to 2# priming pump supplying 1# mud pump: open (1Q03 ball valve) to fully open signal feedback - open (2Q03 ball valve) to fully open signal feedback - soft start 2# priming pump to pressure sensor (PT2) value = pressure sensor (PT 1) current value - soft stop 1# priming pump. This method realizes switching while maintaining the pressure of priming pump, and the pressure at both ends is equal when (2Q03 ball valve) is opened;

[0081] (2) Control method for switching from 1# priming pump supplying 1# mud pump to 3# priming pump supplying 1# mud pump: open (1Q03 ball valve) to fully open signal feedback - open (3Q03 ball valve) to fully open signal feedback - soft start 3# priming pump to pressure sensor (PT3) value = pressure sensor (PT 1) current value - soft stop 1# priming pump. This method realizes switching while the priming pump pressure is maintained, and the pressures at both ends are equal when (3Q03 ball valve) is opened;

[0082] (3) Control method of switching from 1# priming pump supplying 1# mud pump to 1# priming pump supplying 2# mud pump: open (1Q03 ball valve) to full open signal feedback - open (2Q03 ball valve) to full open signal feedback - open (2Q02 ball valve) to full open signal feedback - stop 1# mud pump;

[0083] (4) Control method of switching from 1# priming pump supplying 1# mud pump to 1# priming pump supplying 3# mud pump: open (1Q03 ball valve) to full open signal feedback - open (3Q03 ball valve) to full open signal feedback - open (3Q02 ball valve) to full open signal feedback - stop 1# mud pump;

[0084] (5) Switching from 1# priming pump supplying 1# mud pump to 1# priming pump supplying 1# mud pump + 2# mud pump control method: open (1Q03 ball valve) to full open signal feedback - open (2Q03 ball valve) to full open signal feedback - open (2Q02 ball valve) to full open signal feedback - start 2# mud pump;

[0085] (6) Switching from 1# priming pump supplying 1# mud pump to 1# priming pump supplying 1# mud pump + 3# mud pump control method: open (1Q03 ball valve) to full open signal feedback - open (3Q03 ball valve) to full open signal feedback - open (3Q02 ball valve) to full open signal feedback - start 3# mud pump;

[0086] (7) Control method of switching from 1# injection pump supplying 1# mud pump to 1# injection pump supplying 1# mud pump + 2# mud pump + 3# mud pump: open (1Q03 ball valve) to full open signal feedback - open (2Q03 ball valve) to full open signal feedback - open (2Q02 ball valve) to full open signal feedback - start 2# mud pump - open (3Q03 ball valve) to full open signal feedback - open (3Q02 ball valve) to full open signal feedback - start 3# mud pump;

[0087] (8) The switching of 2# and 3# filling pumps is the same as the above control logic;

[0088] (9) Under the conditions of (5), (6) and (7), it may happen that the 1# priming pump cannot meet the priming demand, and the 2# and 3# priming pumps need to be added in parallel. The control method is: after the system detects that the speed (pump stroke) of ≥2 mud pumps is not zero, it monitors the motor speed of the 1# priming pump every 1 second to see if it is ≥ the rated speed (RPM01) * 90%. If the condition is triggered, the 2# priming pump is started. If the motor speed of the 1# priming pump is ≥ the rated speed (RPM01) * 90% and the motor speed of the 2# priming pump is ≥ the rated speed (RPM02) * 90%, the 3# priming pump is started.

[0089] Constant pressure perfusion mode control method

[0090] (1) Set the 1# filling pump idle frequency (FR1) - set the target filling pressure value (PTT) - start the 1# filling pump according to the (FR1) value - monitor every 1 second whether (PTT) is equal to (PT1). If not, enter PID closed-loop control;

[0091] (2) If the frequency of the 1# inverter reaches the rated operating frequency of the 1# priming pump motor but still fails to reach the target priming pressure value (PPT), start the 2# priming pump according to (9) in the "Automatic Switching Control Method of the Priming Pump Channel";

[0092] (3) If the frequency of the 1# inverter reaches the rated operating frequency of the 1# priming pump motor and the frequency of the 2# inverter reaches the rated operating frequency of the 2# priming pump motor but the target priming pressure value (PPT) is not reached, start the 3# priming pump according to (9) in the "Automatic Switching Control Method of the Priming Pump Channel";

[0093] (4) Monitor (SPM01)+(SPM02)+(SPM03)≦5 every 1 second, and stop the 1#, 2#, and 3# perfusion pumps;

[0094] (5) The control logic of 2# and 3# injection pumps is the same as above.

[0095] Displacement automatic following mode control method

[0096] (1) Set the 1# filling pump idle frequency (FR1) - set the target filling displacement value (QT) - start the 1# filling pump according to the (FR1) value - monitor once every 1 second whether (QT) is equal to (Q01). If not, enter PID closed-loop control;

[0097] (2) If the frequency of the 1# inverter reaches the rated operating frequency of the 1# priming pump motor but still does not reach the target priming displacement value (QT), start the 2# priming pump according to (9) in the "Automatic Switching Control Method of the Priming Pump Channel";

[0098] (3) If the frequency of the 1# inverter reaches the rated operating frequency of the 1# priming pump motor and the frequency of the 2# inverter reaches the rated operating frequency of the 2# priming pump motor but the target priming displacement value (Q01) is not reached, start the 3# priming pump according to (9) in the "Automatic Switching Control Method of the Priming Pump Channel";

[0099] (4) Monitor (SPM01)+(SPM02)+(SPM03)≦5 every 1 second, and stop the 1#, 2#, and 3# perfusion pumps;

[0100] (5) The control logic of 2# and 3# injection pumps is the same as above

[0101] Adaptive control mode control method

[0102] (1) Automatically start and stop the priming pump according to the vibration of the mud pump and the water pressure of the mud pump, realizing fully adaptive control;

[0103] (2) Set the upper limit (SST1) and lower limit (SST2) of the perfusion pump trigger vibration value - set the lower limit (PTT 1) and upper limit (PTT2) of the perfusion pump pressure value - set the target perfusion pressure value (PTT) - set the target perfusion displacement value (QT);

[0104] (3) (SST1) ≥ vibration sensor (SS 1) value - start the 1# perfusion pump according to the target perfusion pressure value (PTT) in the "constant pressure perfusion mode control method";

[0105] (4) Pressure sensor value (PT1) ≥ (PTT1) - start the 1# perfusion pump according to the target perfusion pressure value (PTT) using the "constant pressure perfusion mode control method";

[0106] (5) (SST2) ≥ vibration sensor (SS 1) value - control the 1# filling pump with the “displacement automatic follow mode control method” until it stops;

[0107] (6) (PTT 1) pressure sensor value ≥ (PT2) - control the 1# filling pump with the “displacement automatic follow mode control method” until it stops;

[0108] (7) Monitor (SPM01)+(SPM02)+(SPM03)≦5 every 1 second, and stop the 1#, 2#, and 3# perfusion pumps;

[0109] (8) The control logic of 2# and 3# injection pumps is the same as above.

[0110] Manual control mode control method

[0111] (1) Manual priority mode, that is, when the system detects a manual control trigger, it immediately exits the above three automatic control modes until it is manually switched to the corresponding automatic mode and re-enters closed-loop automatic control. This method improves system safety;

[0112] (2) The operator adjusts the perfusion pump parameters and channel switching according to actual needs.

[0113] Finally, it should be noted that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art may modify the technical solutions described in the aforementioned embodiments or substitute equivalents for some of the technical features therein. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

[0114] Except for the technical features described in the specification, all other technical features are known technologies to those skilled in the art.

Claims

1. High-efficiency and energy-saving adaptive drilling fluid injection system, characterized by: The high-efficiency and energy-saving adaptive drilling fluid injection system includes a channel connecting manifold between injection pumps, an injection pump power motor speed control module, a channel matching control module, a parameter acquisition sensor group and a PLC adaptive control logic module. The parameter acquisition sensor group collects operating information of the injection pump and the mud pump, and transmits this information to the PLC adaptive control logic module. The PLC adaptive control logic module controls the channel connecting manifold between the injection pumps through the channel matching control module based on the information transmitted by the parameter acquisition sensor group to connect and disconnect the channels of multiple injection pumps and multiple mud pump suction pipelines, and controls the displacement and pressure of the injection pump through the injection pump power motor speed control module.

2. The high-efficiency and energy-saving adaptive drilling fluid injection system according to claim 1 is characterized in that: The channel connecting manifold between the perfusion pumps includes a connecting pipeline, multiple channel switching pneumatic ball valves, multiple swing check valves and multiple butterfly valves. The multiple channel switching pneumatic ball valves include multiple first-position ball valves, multiple second-position ball valves and multiple third-position ball valves. The connecting pipeline includes multiple slurry suction pipelines, multiple perfusion pump water supply pipelines, multiple perfusion pipelines, and multiple perfusion branches. Each of the butterfly valves is connected to the corresponding slurry suction pipeline through a flange. The slurry suction pipeline is located between its corresponding mud tank and the corresponding mud pump. Each of the first-position ball valves is connected to the corresponding perfusion pump water supply pipeline through a flange. One end of the perfusion pump water supply pipeline is connected to the corresponding perfusion pump water supply pipeline through a flange. The plate is connected to the corresponding water inlet of the perfusion pump, and one end is welded in parallel with the slurry suction pipeline. The slurry outlet of the perfusion pump is connected to the corresponding swing check valve through a flange plate, and the downstream of the swing check valve is connected to the corresponding second-position ball valve. The swing check valve and the second-position ball valve are located on the perfusion pipeline. The perfusion pipeline and the slurry suction pipeline are welded in parallel, and the interface is located between the butterfly valve and the mud pump on the slurry suction pipeline. The perfusion branch is welded in parallel with the perfusion pipeline, and the interface is located between the swing check valve and the second-position ball valve. The corresponding third-position ball valve is connected to the perfusion branch through a flange plate.

3. The high-efficiency and energy-saving adaptive drilling fluid injection system according to claim 2 is characterized in that: The channel connecting manifold between the perfusion pumps also includes a soft connection, which includes a plurality of flexible rubber soft joints. The connecting pipeline also includes a plurality of parallel pipelines. One end of a certain perfusion branch is welded in parallel with a certain perfusion pipeline, and the other end is welded with a 90° arc elbow with a flange. The elbow flange is connected to a flexible rubber soft joint, and then connected to a certain parallel pipeline; one end of another perfusion branch is welded in parallel with another perfusion pipeline, and the other end is welded with a 90° arc elbow with two flanges. A T-shaped elbow with a flange, one end of the T-shaped elbow is connected to another flexible rubber joint, and then connected to a parallel pipeline, and the other end of the T-shaped elbow is connected to another flexible rubber joint, and then connected to another parallel pipeline; one end of another perfusion branch is welded in parallel with another perfusion pipeline, and the other end is welded with a 90° arc elbow with a flange, and the elbow flange is connected to another flexible rubber joint, and then connected to another parallel pipeline.

4. The high-efficiency and energy-saving adaptive drilling fluid injection system according to claim 3 is characterized in that: Two fixed brackets are installed on each parallel pipeline. A square bottom plate is welded at one end of the bracket and connected to the solid ground or mud pump base with bolts. A pressure plate is welded at the other end. A pressure plate of the same size is then used to fix the parallel pipeline with bolts. The two fixed points must be located between the two flexible rubber joints at both ends of the parallel pipeline.

5. The high-efficiency and energy-saving adaptive drilling fluid injection system according to claim 2 is characterized in that: The parameter acquisition sensor group includes multiple pressure sensors, multiple injection pump speed sensors, multiple mud pump speed sensors, multiple vibration sensors, and multiple valve switch position sensors. Each of the injection pump speed sensors is located on its corresponding injection pump coupling housing to monitor the rotational speed of the injection pump motor and transmit the rotational speed information of the injection pump motor to the PLC adaptive control logic module. Each of the mud pump speed sensors is located on its corresponding mud pump to monitor the rotational speed of the mud pump motor and transmit the rotational speed information of the mud pump motor to the PLC adaptive control logic module. Each of the vibration sensors is located on its corresponding The air bag pressure gauge protective cover base bolt of the mud pump is used to collect the vibration frequency and vibration intensity of the mud pump, and transmit the vibration information to the PLC adaptive control logic module. Each of the pressure sensors is located between the butterfly valve for slurry suction on the slurry suction pipeline and the slurry suction port of the mud pump, collects pressure information and transmits it to the PLC adaptive control logic module. Each of the valve switch position sensors is connected to the actual positions of the full opening and full closing of the corresponding channel switching pneumatic ball valve and the butterfly valve, detects the switch position status of the valve, and transmits the switch position status information to the PLC adaptive control logic module.

6. The high-efficiency and energy-saving adaptive drilling fluid injection system according to claim 5, characterized in that: The variable speed control module of the power motor of the perfusion pump includes multiple frequency conversion controllers respectively connected to the perfusion pumps. The frequency conversion controllers are connected to the PLC adaptive control logic module and adjust the start and stop and speed of the corresponding perfusion pump according to the control signal transmitted by the PLC adaptive control logic module.

7. The high-efficiency and energy-saving adaptive drilling fluid injection system according to claim 6, characterized in that: The channel matching control mechanism includes multiple electromagnetic reversing valves, and the multiple electromagnetic reversing valves are connected to the corresponding channel switching pneumatic ball valves and the butterfly valves. Under the control of the PLC adaptive control logic module, the opening or closing of the channel switching pneumatic ball valves and the butterfly valves connected to them are controlled, and the valve switch position sensor is used to determine whether the opening or closing action is completed.

8. The high-efficiency and energy-saving adaptive drilling fluid injection system according to claim 7, characterized in that: The high-efficiency and energy-saving adaptive drilling fluid injection system also includes a power supply, which includes 380V and 220V power supplies. The power supply is connected to multiple frequency converters to provide them with 380V power. The multiple frequency converters then provide power to the corresponding injection pumps respectively. The power supply is connected to multiple electromagnetic reversing valves and the PLC adaptive control logic module to provide 220V power.

9. The high-efficiency and energy-saving adaptive drilling fluid injection system according to claim 7, characterized in that: The PLC adaptive control logic module includes a power module, a CPU module, a digital input module, a digital output module, an analog input module, and a communication interface. The power module converts the received 220V AC into 24V DC to power the PLC adaptive control logic module. The digital input module is connected to the plurality of valve switch position sensors, receives valve switch position status information, and transmits it to the CPU module. The digital output module is connected to the plurality of solenoid reversing valves, receives control signals transmitted from the CPU module, and transmits the control signals to the plurality of solenoid reversing valves to control the opening and closing and on-off of the plurality of solenoid reversing valves. The analog input module is connected to the plurality of pressure sensors, the plurality of priming pump speed sensors, the plurality of mud pump speed sensors, and the plurality of vibration sensors, converts the signals transmitted by these sensors into universal unit values, and transmits them to the CPU module. The communication interface is connected to the plurality of frequency conversion controllers, and transmits the control signals transmitted by the CPU module to the plurality of frequency conversion controllers to adjust the start, stop, and speed of the priming pumps corresponding to the frequency conversion controllers.

10. An energy-efficient and adaptive drilling fluid injection method, characterized in that: The high-efficiency and energy-saving adaptive drilling fluid injection method adopts the high-efficiency and energy-saving adaptive drilling fluid injection system according to claim 1, comprising: Step 1: The parameter acquisition sensor group collects the operation information of the priming pump and the mud pump, and transmits this information to the PLC adaptive control logic module; Step 2: The PLC adaptive control logic module collects information transmitted by the sensor group based on the parameters, and controls the channel connection manifold between the grouting pumps through the channel matching control module to connect and disconnect the channels between the multiple grouting pumps and the multiple mud pump suction pipelines; Step 3: The PLC adaptive control logic module controls the displacement and pressure of the perfusion pump through the perfusion pump power motor speed control module according to the information transmitted by the parameter acquisition sensor group.

11. The high-efficiency, energy-saving and adaptive drilling fluid injection method according to claim 10 is characterized in that: In step 1, the injection pump speed sensor monitors the speed of the injection pump motor and transmits the speed information of the injection pump motor to the PLC adaptive control logic module. The mud pump speed sensor monitors the speed of the mud pump motor and transmits the speed information of the mud pump motor to the PLC adaptive control logic module. The vibration sensor collects the vibration frequency and vibration intensity of the mud pump and transmits the vibration information to the PLC adaptive control logic module. The pressure sensor collects the pressure information on the slurry suction pipeline and transmits it to the PLC adaptive control logic module. The valve switch position sensor detects the switch position status of the channel switching pneumatic ball valve and butterfly valve, and transmits the switch position status information to the PLC adaptive control logic module.

12. The high-efficiency, energy-saving and adaptive drilling fluid injection method according to claim 10, characterized in that: In step 2, the PLC adaptive control logic module switches the pneumatic ball valve and butterfly valve to open or close according to the information transmitted by the parameter acquisition sensor group through the electromagnetic reversing valve control channel, and determines whether the opening or closing action is completed through the valve switch position sensor.

13. The high-efficiency and energy-saving adaptive drilling fluid injection method according to claim 10, characterized in that: In step 3, the PLC adaptive control logic module controls the start and stop and speed of the perfusion pump through the frequency conversion controller according to the information transmitted by the parameter acquisition sensor group.

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