Geological drilling fluid energy-saving control system and method

Abstract

The invention discloses a geological drilling fluid energy-saving control system which comprises a control circuit and a hydraulic loop. The control circuit comprises a controller, and a man-machine interaction module, a flow detection unit and a pressure detection unit which are in signal connection with the controller; the man-machine interaction module sets drilling fluid flow and start-stop instructions; the flow detection unit and the pressure detection unit respectively detect the real-time flow and pressure of the drilling fluid loop and feed the real-time flow and pressure back to the controller; the hydraulic loop comprises a hydraulic oil tank, a variable pump, a hydraulic control valve group and a drilling fluid motor which are connected in sequence; the controller controls the hydraulic control valve group to open or close a driving oil path of the drilling fluid motor according to a start-stop instruction of the man-machine interaction module; and controlling the rotating speed of the drilling fluid motor according to a set drilling fluid flow value in combination with a feedback signal after starting. According to the geological drilling fluid energy-saving control system, accurate control over the flow of the drilling fluid is achieved, and energy consumption in the drilling process is greatly reduced.

Description

Technical Field

[0001] This invention relates to the technical field of geological core drilling, specifically to an energy-saving control system and method for geological drilling fluid. Background Technology

[0002] Geological core drilling refers to the technique of directly obtaining subsurface information by drilling and coring strata at a certain depth. Drilling fluid, typically mud, is a water-based drilling fluid; in special cases, oil-based or other types of drilling fluid may be used. Mud is a crucial component of geological core drilling, accompanying the entire drilling process and serving functions such as cuttings removal, borehole wall protection, and cooling. It is also frequently used as the bottom hole power drive in drilling operations. Its performance parameters affect borehole quality and drilling efficiency, and mud consumption directly impacts drilling rig energy consumption and drilling costs.

[0003] In geological core drilling, drilling mud is generally generated by a hydraulic pump driving a mud motor. Due to the increased hole depth, complex strata, and diverse processes during drilling, a wide range of mud flow and pressure needs to be adapted. Currently, the traditional construction process involves operators visually observing the mud return at the borehole opening and then manually controlling the flow rate by mechanically shifting gears. The disadvantages are that it is impossible to obtain and control the accurate mud flow rate, resulting in poor matching with the drilling process. Most of the time, the mud flow rate is in a redundant state, especially in situations where mud is not needed, such as when the drill string is being pulled up or down. The hydraulic pump is still running at full flow, resulting in high energy consumption and poor economic efficiency.

[0004] The aforementioned technical problems are particularly severe in deep-hole drilling (targeting formations at depths of 1000-3000m). Therefore, there is an urgent need for a system and method that can achieve precise, automatic, and on-demand control of drilling fluid flow and pressure, while significantly reducing energy consumption. Summary of the Invention

[0005] To address the above-mentioned technical problems, this invention provides an energy-saving control system and method for geological drilling fluid. Through data acquisition and energy-saving control technologies, the pump pressure and pump flow are monitored and centrally controlled in real time, and matched in real time according to load requirements. This satisfies the refined requirements of different depths, formations and processes in drilling for mud flow and pressure, while ensuring that the hydraulic pump always operates in the most economical state, achieving the goal of high efficiency and energy saving.

[0006] To achieve the above objectives, the technical solution of the present invention is as follows:

[0007] An energy-saving control system for geological drilling fluid includes a control circuit and a hydraulic circuit;

[0008] The control circuit includes a controller, a human-machine interface module, a flow detection unit, and a pressure detection unit that are signal-connected to the controller; the human-machine interface module sets the drilling fluid flow rate and start / stop commands; the flow detection unit and the pressure detection unit respectively detect the real-time flow rate and pressure of the drilling fluid circuit and feed them back to the controller;

[0009] The hydraulic circuit includes a hydraulic tank, a variable pump, a hydraulic control valve assembly, and a drilling fluid motor; the inlet of the variable pump is connected to the hydraulic tank, and its outlet is connected to the inlet of the hydraulic control valve assembly; the outlet of the hydraulic control valve assembly is connected to the drive oil circuit of the drilling fluid motor.

[0010] The controller controls the hydraulic control valve group to open or close the drive oil circuit of the drilling fluid motor according to the start / stop command of the human-machine interaction module; and after opening, it outputs a control signal to the hydraulic control valve group according to the set drilling fluid flow rate value and the feedback signals of the flow detection unit and the pressure detection unit, so as to adjust the flow rate through the drive oil circuit and thereby control the speed of the drilling fluid motor.

[0011] This geological drilling fluid energy-saving control system sets the drilling fluid flow rate and collects real-time flow and pressure data from the drilling fluid circuit, matching the data in real time according to load requirements. The controller adjusts the flow rate of the drilling fluid motor drive circuit through hydraulic control valve groups, controlling the speed of the drilling fluid motor to output the actual required drilling fluid flow rate. This meets the precise requirements of drilling fluid flow rate and pressure for different depths, formations, and processes during drilling, while ensuring that the variable pump always operates in the most economical state, achieving high efficiency and energy saving.

[0012] Further optimization of the scheme: the hydraulic control valve group includes an electrically controlled on / off valve and an electrically controlled flow regulating valve.

[0013] In a further optimized design, the electrically controlled on / off valve is a solenoid switching valve.

[0014] In a further optimized design, the electrically controlled flow regulating valve is an electro-proportional regulating valve.

[0015] In a further optimized scheme, the variable pump is a load-sensitive variable pump, which is configured to automatically adjust its displacement according to the system pressure fed back by the pressure detection unit so that the output power matches the load demand.

[0016] In a further optimized design, a sensitive valve is integrated on the load-sensitive variable pump, which senses the system pressure and flow requirements and dynamically adjusts the pump displacement.

[0017] In a further optimized design, the hydraulic circuit also includes a pressure relief valve connected to the outlet oil line of the variable pump, which releases pressure when the system pressure exceeds a safety threshold.

[0018] In a further optimized design, the hydraulic circuit also includes a hydraulically controlled switching valve, which is connected in parallel with the electrically controlled flow regulating valve to form an emergency bypass oil circuit when the electrically controlled flow regulating valve fails.

[0019] The scheme is further optimized so that the hydraulic control switching valve is a two-position four-way hydraulic control directional valve.

[0020] In a further optimized design, the components of the control circuit are connected via a CAN bus.

[0021] In a further optimized design, the flow detection unit includes a flow sensor, and the pressure detection unit includes a pressure sensor.

[0022] A method for energy-saving control of drilling fluid in geological drilling, employing the aforementioned energy-saving control system for geological drilling fluid, includes the following steps:

[0023] S1. Initiate the drilling fluid supply command through the human-machine interaction module;

[0024] S2. In response to the above instruction, the controller controls the electrically controlled on / off valve to operate, thereby starting the variable pump;

[0025] S3. Input the drilling fluid flow rate setting value required for the current drilling operation through the human-computer interaction module;

[0026] S4. The controller calculates the hydraulic oil flow rate required to drive the drilling fluid motor based on the above-mentioned drilling fluid flow rate setting value;

[0027] S5. The controller outputs a control signal to the electronically controlled flow regulating valve according to the calculated hydraulic oil flow rate, and adjusts its opening to control the hydraulic oil flow rate input to the drilling fluid motor, so that the drilling fluid motor outputs a drilling fluid flow rate that matches the set value.

[0028] S6. The actual drilling fluid flow rate and pressure of the system are detected in real time by the flow detection unit and the pressure detection unit, and displayed on the human-machine interaction module.

[0029] S7. The variable pump dynamically adjusts its displacement according to the real-time pressure and flow requirements of the system, so that its output hydraulic power matches the requirements.

[0030] This energy-saving control method for geological drilling fluid uses data acquisition and energy-saving control technology to monitor and centrally control pump pressure and pump volume in real time, so that they are precisely matched according to the drilling load requirements, and significantly reduce energy consumption during the drilling process.

[0031] Further optimizing the scheme, in step S4, the formula for calculating the hydraulic oil flow rate required by the drilling fluid motor is as follows:

[0032] F h =F m / V m *n*V h / ŋ

[0033] Wherein: F h —Required hydraulic oil flow rate

[0034] F m —Required drilling fluid flow rate

[0035] V m —Drilling fluid pump displacement

[0036] n—reduction ratio,

[0037] V h — Drilling fluid motor displacement,

[0038] ŋ——System efficiency.

[0039] Further optimization of the plan also includes the following steps:

[0040] S8. When a command to stop drilling fluid supply is received through the human-machine interface module, the controller controls the electrically controlled on / off valve to reset, causing the variable pump to enter a low-displacement standby state. During non-operational periods, the system can put the variable pump into standby mode to save energy consumption.

[0041] Further optimization of the plan also includes emergency response procedures:

[0042] The electrically controlled flow regulating valve is connected in parallel with a hydraulically controlled switching valve, forming an emergency bypass oil circuit. When the electrically controlled flow regulating valve fails, the hydraulically controlled switching valve is activated, allowing hydraulic oil to drive the drilling fluid motor via the emergency bypass oil circuit. This fault emergency procedure ensures that the operation is not interrupted.

[0043] The energy-saving control system and method for geological drilling fluid of the present invention have the following technical advantages compared with the prior art:

[0044] 1. Precise control: Through the feedback signals from the flow detection unit and pressure detection unit and the adjustment of the electronically controlled flow regulating valve, precise and automated control of drilling fluid flow and pressure is achieved, improving the matching of drilling technology and hole quality.

[0045] 2. High efficiency and energy saving: By utilizing load-sensitive technology, the output power of the hydraulic pump is always matched with the real-time load demand, completely eliminating the redundant energy consumption of traditional systems, and the energy-saving effect is particularly significant under intermittent working conditions.

[0046] 3. Safe and reliable: A pressure relief valve is installed for overload protection, and a hydraulic control switching valve is designed as an emergency bypass to ensure that drilling operations can continue in the event of a failure in the electrical control system, thereby improving the reliability and safety of the system.

[0047] 4. Easy to operate: The integrated human-computer interaction interface makes operation intuitive and simple, reducing the reliance on the operator's experience. Attached Figure Description

[0048] Figure 1 This is a schematic diagram of the control circuit principle of a specific embodiment of the geological drilling fluid energy-saving control system of the present invention;

[0049] Figure 2 yes Figure 1 A schematic diagram of the hydraulic circuit principle in the embodiment;

[0050] Figure 3 It is an application Figure 1 Flowchart of the control method in the embodiment.

[0051] In the diagram: 1. Hydraulic oil tank; 2. Load-sensitive variable pump; 3. Sensitive valve; 4. Pressure relief valve; 5. Electro-proportional regulating valve; 6. Solenoid switching valve; 7. Hydraulic control switching valve; 8. Drilling fluid motor. Detailed Implementation

[0052] The present invention will now be described in further detail with reference to the embodiments shown in the accompanying drawings.

[0053] like Figures 1 to 3 As shown, a specific embodiment of the geological drilling fluid energy-saving control system of the present invention and a control method for applying the embodiment are disclosed; in this embodiment, the drilling fluid is mud.

[0054] like Figure 1 and Figure 2 As shown, the geological drilling fluid energy-saving control system of this embodiment includes a control circuit and a hydraulic circuit.

[0055] The control circuit includes a controller, a human-machine interface module, a flow detection unit, and a pressure detection unit that are connected to the controller via signals; the human-machine interface module sets the drilling fluid flow rate and start / stop commands; the flow detection unit and the pressure detection unit detect the real-time flow rate and pressure of the drilling fluid circuit and feed them back to the controller.

[0056] The control circuit also includes a battery that provides power, with a 24V power supply selected; the components of the control circuit are connected via a CAN bus.

[0057] The hydraulic circuit includes a hydraulic oil tank 1, a variable pump, a hydraulic control valve group, and a drilling fluid motor 8; the inlet of the variable pump is connected to the hydraulic oil tank 1, and its outlet is connected to the inlet of the hydraulic control valve group; the outlet of the hydraulic control valve group is connected to the drive oil circuit of the drilling fluid motor 8.

[0058] Specifically, the human-computer interaction module is a display screen; the flow detection unit includes a flow sensor, and the pressure detection unit includes a pressure sensor.

[0059] The hydraulic control valve assembly includes an electrically controlled on / off valve and an electrically controlled flow regulating valve; the electrically controlled on / off valve is specifically an electromagnetic switching valve 6, and the electrically controlled flow regulating valve is specifically an electro-proportional regulating valve 5.

[0060] The controller controls the electromagnetic switching valve 6 to open or close the drive oil circuit of the drilling fluid motor 8 according to the start / stop command of the human-machine interaction module; and after opening, according to the set drilling fluid flow rate value and combined with the feedback signals of the flow detection unit and the pressure detection unit, the controller outputs a control signal to the electro-proportional regulating valve 5 to adjust the flow rate through the drive oil circuit, thereby controlling the speed of the drilling fluid motor 8.

[0061] This geological drilling fluid energy-saving control system sets the drilling fluid flow rate and collects real-time flow and pressure data from the drilling fluid circuit, matching the data in real time according to load requirements. The controller adjusts the flow rate of the oil circuit driven by the drilling fluid motor 8 through the electro-proportional regulating valve 5, controlling the speed of the drilling fluid motor 8, thereby outputting the actual required drilling fluid flow rate. This meets the precise requirements of drilling fluid flow rate and pressure for different depths, formations, and processes during drilling, while ensuring that the variable pump always operates in the most economical state, achieving high efficiency and energy saving.

[0062] like Figure 2 As shown, the variable pump is a load-sensitive variable pump 2, which is configured to automatically adjust its displacement based on the system pressure fed back by the pressure detection unit to match the output power with the load demand. The load-sensitive variable pump 2 integrates a sensitive valve 3, which senses the system pressure and flow demand and dynamically adjusts the pump displacement.

[0063] like Figure 2 As shown, the hydraulic circuit also includes a pressure relief valve 4, which is connected to the outlet oil line of the variable pump and releases pressure when the system pressure exceeds the safety threshold.

[0064] like Figure 2 As shown, the hydraulic circuit also includes a hydraulically controlled switching valve 7, which is connected in parallel with the electrically controlled flow regulating valve to form an emergency bypass oil circuit when the electrically controlled flow regulating valve fails. Specifically, the hydraulically controlled switching valve 7 is a two-position four-way hydraulically controlled directional valve.

[0065] like Figure 3As shown, this invention also discloses an energy-saving control method for geological drilling fluid, which employs the above-mentioned energy-saving control system for geological drilling fluid and includes the following steps:

[0066] S1. Initiate the mud supply command via the display screen;

[0067] S2. In response to the above instructions, the controller controls the electromagnetic switching valve 6 to start the load-sensitive variable pump 2.

[0068] S3. Input the mud flow rate setting value required for the current drilling operation via the display screen;

[0069] S4. Based on the above-mentioned drilling fluid flow rate setpoint, the controller calculates the hydraulic oil flow rate required to drive the drilling fluid motor 8.

[0070] S5. The controller outputs a control signal to the electro-proportional regulating valve 5 based on the calculated hydraulic oil flow rate, and adjusts its opening to control the hydraulic oil flow rate input to the drilling fluid motor 8, so that the drilling fluid motor 8 outputs mud flow rate that matches the set value.

[0071] S6. The actual mud flow and pressure of the system are detected in real time by flow and pressure sensors and displayed on the screen.

[0072] S7, Load-sensitive variable pump 2 dynamically adjusts its displacement according to the real-time pressure and flow requirements of the system, so that its output hydraulic power matches the requirements;

[0073] S8. When a stop mud supply command is received via the display screen, the controller controls the electromagnetic switching valve 6 to reset, causing the load-sensitive variable pump 2 to enter a low-discharge standby state.

[0074] S9. When the electro-proportional regulating valve 5 fails, the hydraulic control switching valve 7 is activated, so that the hydraulic oil drives the drilling fluid motor 8 through the emergency bypass oil circuit.

[0075] S10. When the system pressure is higher than the normal value, the pressure relief valve 4 is activated to relieve system pressure and protect the load-sensitive variable pump 2, drilling fluid motor 8, etc. from further damage.

[0076] Specifically, in step S4, the formula for calculating the hydraulic oil flow rate required by the drilling fluid motor 8 is as follows:

[0077] F h =F m / V m *n*V h / ŋ

[0078] Wherein: F h —Required hydraulic oil flow rate

[0079] Fm —Required drilling fluid flow rate

[0080] V m —Drilling fluid pump displacement

[0081] n—reduction ratio,

[0082] V h — Drilling fluid motor displacement,

[0083] ŋ——System efficiency.

[0084] In the above calculation formula, the drilling fluid pump displacement V m Specifically, the drilling fluid motor is driven by hydraulic oil, and then the crankshaft is rotated by mechanical transmission through a reducer, which in turn causes the plunger to move back and forth to drive the drilling fluid. The drilling fluid pump displacement is the volume of drilling fluid output per plunger revolution; the reduction ratio n specifically refers to the speed ratio between the drilling fluid motor and the reducer between the crankshaft and the reducer.

[0085] This geological drilling fluid energy-saving control system and method uses data acquisition and energy-saving control technologies to monitor and centrally control pump pressure and flow rate in real time, and match them in real time according to load requirements. This satisfies the precise requirements of different depths, formations and processes in drilling for mud flow rate and pressure, while ensuring that the hydraulic pump always operates in the most economical state, achieving the goal of high efficiency and energy saving.

[0086] In summary, as described in the specification and figures, this invention has been manufactured into actual samples and tested multiple times. The test results demonstrate that the invention achieves its intended purpose, and its practicality is beyond doubt. The embodiments described above are merely for illustrative purposes and are not intended to limit the scope of the invention. Any equivalent embodiments made by those with common knowledge in the relevant technical field, utilizing the technical content disclosed in this invention without departing from the scope of the technical features and similar features of this invention, based on partial modifications or alterations, are within the protection scope of this invention.

Claims

1. A geologic drilling rig fluid energy saving control system, characterized by: The control circuit comprises a controller, a man-machine interaction module, a flow detection unit and a pressure detection unit connected to the controller, and the man-machine interaction module sets drilling fluid flow and start-stop instructions, and the flow detection unit and the pressure detection unit detect the real-time flow and pressure of the drilling fluid circuit and feed back to the controller. The hydraulic circuit comprises a hydraulic oil tank (1), a variable pump, a hydraulic control valve group and a drilling fluid motor (8), the inlet of the variable pump is connected to the hydraulic oil tank (1), the outlet of the variable pump is connected to the inlet of the hydraulic control valve group, and the outlet of the hydraulic control valve group is connected to the driving oil circuit of the drilling fluid motor (8). The controller controls the hydraulic control valve group to open or close the driving oil circuit of the drilling fluid motor (8) according to the start-stop instructions of the man-machine interaction module, and outputs a control signal to the hydraulic control valve group to adjust the flow through the driving oil circuit according to the set drilling fluid flow value and the feedback signal of the flow detection unit and the pressure detection unit after being opened, so as to control the rotating speed of the drilling fluid motor (8). The hydraulic control valve group comprises an electrically controlled on-off valve and an electrically controlled flow regulating valve.

2. The geologic drilling fluid energy saving control system of claim 1, wherein, The electrically controlled on-off valve is an electromagnetic switching valve (6).

3. The geologic drilling fluid energy saving control system of claim 2, wherein, The electrically controlled flow regulating valve is an electric proportional regulating valve (5).

4. A geologic drilling fluid energy saving control system according to claim 2 or 3, characterized in that, The variable pump is a load-sensitive variable pump (2) configured to automatically adjust the displacement according to the system pressure fed back by the pressure detection unit, so that the output power matches the load demand.

5. The geologic drilling fluid energy saving control system of claim 1, wherein, The load-sensitive variable pump (2) is integrated with a sensitive valve (3) that senses the system pressure and flow demand and dynamically adjusts the pump displacement.

6. The geologic drilling fluid energy saving control system of claim 5, wherein, The hydraulic circuit further comprises a pressure relief valve (4) connected to the outlet oil circuit of the variable pump, which releases pressure when the system pressure exceeds a safety threshold.

7. The geologic drilling fluid energy saving control system of claim 1, wherein, The hydraulic circuit further comprises a hydraulic control switching valve (7) arranged in parallel with the electrically controlled flow regulating valve to form an emergency bypass oil circuit when the electrically controlled flow regulating valve fails.

8. The geologic drilling fluid energy saving control system of claim 2, wherein, The hydraulic control switching valve (7) is a two-position four-way hydraulic control reversing valve.

9. The geologic drilling fluid energy saving control system of claim 8, wherein, The components of the control circuit are connected through a CAN bus.

10. The geologic drilling fluid energy saving control system of claim 1, wherein, The flow detection unit comprises a flow sensor, and the pressure detection unit comprises a pressure sensor.

11. The geologic drilling fluid energy saving control system of claim 1, wherein, The geological drilling drilling fluid energy-saving control system of claim 2 comprises the following steps:

12. A method of energy saving control of a geological drilling drilling fluid, characterized by, S1, starting the drilling fluid supply instruction through the man-machine interaction module; S2, in response to the above instruction, the controller controls the electrically controlled on-off valve to act, so that the variable pump starts; S3, inputting the required drilling fluid flow set value of the current drilling operation through the man-machine interaction module; S4, the controller calculates the required hydraulic oil flow for driving the drilling fluid motor (8) based on the above drilling fluid flow set value; S5, the controller outputs a control signal to the electrically controlled flow regulating valve according to the calculated hydraulic oil flow to adjust the opening degree, so as to control the hydraulic oil flow input to the drilling fluid motor (8), so that the drilling fluid motor (8) outputs the drilling fluid flow matching the set value. ​ S6, detecting the actual drilling fluid flow and pressure of the system in real time through the flow detection unit and pressure detection unit, and displaying on the human-computer interaction module; S7, the variable pump dynamically adjusts its displacement according to the real-time pressure and flow demand of the system, so that its output matches the required hydraulic power.

13. The method of claim 12, wherein the method further comprises: In step S4, the calculation formula of the required hydraulic oil flow of the drilling fluid motor (8) is: F h =F m / V m *n*V h / ŋ Where: F h - the required drive hydraulic fluid flow rate, F m — the required drilling fluid flow rate, V m - drilling fluid pump displacement, n——reduction ratio, V h - drilling fluid motor displacement, ŋ——system efficiency.

14. The method of claim 12, wherein the method further comprises: Further comprising steps: S8, when receiving the stop drilling fluid supply instruction through the human-computer interaction module, the controller controls the electrically controlled on-off valve to reset, so that the variable pump enters the low-displacement standby state.

15. The method of claim 12, wherein the method further comprises: Further comprising emergency steps for failure: The electrically controlled flow regulating valve is provided with a hydraulic control switching valve (7) in parallel, and an emergency bypass oil path is formed through the hydraulic control switching valve (7); when the electrically controlled flow regulating valve fails, the hydraulic control switching valve (7) is controlled to act, so that the hydraulic oil drives the drilling fluid motor (8) through the emergency bypass oil path.

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