Hydraulic oil circuit, control method, and drilling sidewall coring instrument

Abstract

This invention provides a hydraulic circuit, control method, and drilling-type wellbore coring instrument, belonging to the field of petroleum logging technology. It includes: a main hydraulic circuit with an oil pump injection mechanism; a first sub-circuit connected to the main hydraulic circuit, equipped with a first solenoid valve, a first control valve, a core pusher piston, and at least two push arm pistons; a second sub-circuit connected to the main hydraulic circuit, equipped with a first sequence valve, a second solenoid valve, a second control valve, and a drill bit holding mechanism piston; a third sub-circuit connected to the main hydraulic circuit, equipped with a second sequence valve, a third solenoid valve, a third control valve, and a drill bit piston; the first interfaces of the third solenoid valve and the second sequence valve are connected to the main hydraulic circuit; and a fourth solenoid valve is located between the third control valve and the drill bit piston for adjusting the pressure value of the drill bit piston. This invention has a simple structure and can improve the stability and reliability of the drill bit during drilling.

Description

Technical Field

[0001] This invention relates to the field of oil well logging technology, specifically to a hydraulic circuit, a control method for the hydraulic circuit, a drilling-type wellbore coring instrument, an electronic device, and a readable storage medium. Background Technology

[0002] With the development of logging technology, oilfield exploration and reservoir development are becoming increasingly complex. Core analysis to determine reservoir permeability and formation pressure gradients has become crucial. Geological exploration increasingly demands data on fluid saturation, reservoir pressure, relative humidity, and reservoir properties in heterogeneous reservoirs under bottom-hole conditions that more closely approximate actual formation conditions. The market urgently needs large-diameter wellbore coring technology to meet oilfield service requirements and solve complex reservoir exploration and development problems. There is a very close relationship between logging and core data. Almost every analytical data point related to the core can be directly or indirectly related to the logging curve, such as core analysis density, porosity, saturation, permeability, and capillary pressure. These data can all be derived from the logging curve, forming the basis for matching logging and core analysis data and serving as important data for verifying and improving interpretation methods.

[0003] Downhole coring mainly includes several methods: drilling coring, percussion coring, and rotary wellbore coring. Drilling coring is complex, time-consuming, and involves large stratigraphic spans with inaccurate positioning, making it impossible to cor from all types of formations throughout the well section. Percussion coring yields small, irregularly shaped cores, which is unfavorable for physical property analysis. Rotary wellbore coring overcomes the shortcomings of drilling and percussion coring, producing cores with regular grains, allowing for direct observation of lithology and oil-bearing properties, as well as direct analysis of lithology, electrical properties, physical properties, and oil-bearing properties to determine reservoir parameters such as saturation, porosity, and permeability. Furthermore, it is simple to implement and low-cost. Therefore, rotary wellbore coring technology has been welcomed by various oil companies and has broad application prospects.

[0004] Drilling-type wellbore coring requires drilling and coring downhole to ensure the integrity and storage of the core. The probe of the coring instrument is the core component. The stability and reliability of the probe structure, as well as the rationality of the working method, are key to wellbore coring. However, existing drilling-type wellbore coring tools cannot achieve stable drilling of the drill bit, which can easily lead to incomplete cores and coring failure. Summary of the Invention

[0005] The purpose of this invention is to provide a hydraulic circuit, control method, and drilling-type wellbore coring instrument to solve the problem that existing drilling-type wellbore coring instruments cannot achieve stable drilling of the drill bit, easily resulting in incomplete rock cores and leading to coring failure.

[0006] To achieve the above objectives, embodiments of the present invention provide a hydraulic circuit for use in a drilling-type wellbore coring instrument. The drilling-type wellbore coring instrument includes: a core push rod, a push arm, a drill bit, and a drill bit holding mechanism. The drill bit holding mechanism is used to engage the drill bit during coring to prevent it from shaking. The hydraulic circuit includes:

[0007] The hydraulic main oil circuit is equipped with an oil pump injection mechanism.

[0008] The first sub-oil circuit is connected to the main hydraulic oil circuit. The first sub-oil circuit is equipped with a first solenoid valve, a first control valve, a core push rod piston, and at least two push arm pistons. The first interfaces of the first solenoid valve and the first control valve are connected to the main hydraulic oil circuit. The second interface of the first control valve is connected to the second interface of the first solenoid valve. The third interface of the first control valve is connected to the first interface of the core push rod piston and the push arm piston. The fourth interface of the first control valve is connected to the second interface of the core push rod piston and the push arm piston.

[0009] The second sub-oil circuit is connected to the main hydraulic oil circuit. The second sub-oil circuit is equipped with a first sequence valve, a second solenoid valve, a second control valve, and a drill bit holding mechanism piston. The first interfaces of the second solenoid valve and the first sequence valve are connected to the main hydraulic oil circuit. The second interface of the first sequence valve is connected to the first interface of the second control valve. The second interface of the second control valve is connected to the second interface of the second solenoid valve. The third interface of the second control valve is connected to the first interface of the drill bit holding mechanism piston. The fourth interface of the second control valve is connected to the second interface of the drill bit holding mechanism piston.

[0010] The third sub-oil circuit is connected to the main hydraulic oil circuit. The third sub-oil circuit is equipped with a second sequence valve, a third solenoid valve, a third control valve, and a drill piston. The first interfaces of the third solenoid valve and the second sequence valve are connected to the main hydraulic oil circuit. The second interface of the second sequence valve is connected to the first interface of the third control valve. The second interface of the third control valve is connected to the second interface of the third solenoid valve. The third interface of the third control valve is connected to the first interface of the drill piston. The fourth interface of the third control valve is connected to the second interface of the drill piston.

[0011] A fourth solenoid valve is disposed between the fourth port of the third control valve and the second port of the drill piston, and is used to adjust the pressure value of the drill piston.

[0012] Optionally, the oil pumping mechanism includes:

[0013] Hydraulic motors and hydraulic pumps are used to increase the pressure of the main hydraulic circuit.

[0014] Optionally, the hydraulic circuit further includes:

[0015] The relief valve assembly is connected to the main hydraulic circuit and is used to release pressure when the pressure value in the main hydraulic circuit exceeds a preset threshold.

[0016] The overflow valve assembly includes at least two first overflow valves.

[0017] Optionally, the hydraulic circuit further includes: a first pressure gauge and a second pressure gauge;

[0018] The first pressure gauge is disposed between the oil pumping mechanism and the first control valve;

[0019] The second pressure gauge is positioned between the second sequence valve and the third control valve.

[0020] Optionally, the hydraulic circuit further includes:

[0021] A first reverse overflow valve is disposed between the oil pumping mechanism and the first control valve to prevent hydraulic oil backflow.

[0022] Optionally, the hydraulic circuit further includes:

[0023] Multiple pressure compensation valve groups are provided, with a pressure compensation valve group between the third port of the first control valve and the first port of the core push rod piston, between the second port of the first sequence valve and the first port of the second control valve, and between the second port of the second sequence valve and the first port of the third control valve, for compensating the pressure of the corresponding oil circuit.

[0024] The force compensation valve assembly includes: a second relief valve and a second reverse relief valve connected in parallel.

[0025] Optionally, the hydraulic circuit further includes a third reverse relief valve and a flow control valve, which are connected in parallel between the fourth port of the third control valve and the second port of the drill piston.

[0026] The flow control valve is used to adjust the retraction speed of the drill bit piston.

[0027] Optionally, the flow control valve includes a check valve and a throttle valve arranged in parallel.

[0028] Secondly, embodiments of the present invention also provide a control method for a hydraulic circuit, applied to the aforementioned hydraulic circuit, the method comprising:

[0029] Confirmation that the core extraction command has been received;

[0030] The control oil pump injection mechanism starts working, and at the same time, the first solenoid valve is energized to control the first control valve to retract the core push rod piston and extend the push arm piston.

[0031] Upon receiving the engagement start command, energize the second solenoid valve to control its operation, causing the drill bit holding mechanism piston to extend.

[0032] Once the engagement is confirmed and the operation is complete, the third solenoid valve is energized to control its operation, causing the drill bit piston to extend and begin drilling. Simultaneously, the fourth solenoid valve is energized to adjust the drilling pressure.

[0033] Once the maximum drilling position signal is received, power to the second solenoid valve is stopped, the second control valve is reset, and the piston of the drill bit holding mechanism is retracted.

[0034] Once the piston retraction signal is received, the duty cycle of the fourth solenoid valve is adjusted to the preset value, the power supply to the third solenoid valve is stopped, the third control valve is reset, and the drill piston retracts.

[0035] Upon receiving the drill bit retraction signal, the power supply to the first solenoid valve is stopped, the first control valve is reset, causing the core pusher piston to extend and the push arm piston to retract.

[0036] Thirdly, embodiments of the present invention also provide a drilling-type wellbore coring instrument, including the aforementioned hydraulic circuit.

[0037] Fourthly, embodiments of the present invention also provide an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the above-described hydraulic circuit control method.

[0038] Fifthly, embodiments of the present invention also provide a readable storage medium storing instructions for causing a machine to execute the aforementioned hydraulic circuit control method.

[0039] In this technical solution, the position of the drilling-type core sampling instrument is fixed by a set push-arm piston. At the same time, the drill bit is locked by a set drill bit holding mechanism piston, thereby preventing the drill bit from shaking during drilling. The overall structure of the hydraulic circuit is simple, which can improve the stability and reliability of the drill bit during drilling, ensure the integrity of the rock core, and ensure the quality of the obtained rock core.

[0040] Other features and advantages of the embodiments of the present invention will be described in detail in the following detailed description section. Attached Figure Description

[0041] The accompanying drawings are provided to further illustrate embodiments of the present invention and form part of the specification. They are used together with the following detailed description to explain the embodiments of the present invention, but do not constitute a limitation thereof. In the drawings:

[0042] Figure 1This is a schematic diagram of the hydraulic circuit provided by the present invention;

[0043] Figure 2 This is a flowchart of the hydraulic circuit control method provided by the present invention;

[0044] Figure 3 This is a partial structural schematic diagram of the drilling-type wellbore coring instrument provided by the present invention;

[0045] Figure 4 This is a structural block diagram of the drilling-type wellbore coring instrument provided by the present invention.

[0046] Explanation of reference numerals in the attached figures

[0047] 1-Main hydraulic circuit; 2-Oil pumping mechanism; 3-First sub-circuit;

[0048] 4-Second sub-oil circuit; 5-Third sub-oil circuit; 6-Fourth solenoid valve;

[0049] 11-Relief valve assembly; 21-Hydraulic motor; 22-Hydraulic pump;

[0050] 31-First solenoid valve; 32-First control valve; 33-Core push rod piston;

[0051] 34-Push-arm piston; 41-First sequence valve; 42-Second solenoid valve;

[0052] 43-Second control valve; 44-Drill bit holding mechanism piston; 51-Second sequence valve;

[0053] 52-Third solenoid valve; 53-Third control valve; 54-Drill bit piston;

[0054] 71-First pressure gauge; 72-Second pressure gauge; 73-First reverse relief valve;

[0055] 74-Pressure compensation valve assembly; 75-Third reverse relief valve; 76-Quantity control valve;

[0056] 741 - Second relief valve; 742 - Second reverse relief valve; 761 - Check valve;

[0057] 762 - Throttling valve. Detailed Implementation

[0058] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the scope of the present invention.

[0059] In the embodiments of the present invention, unless otherwise stated, directional terms such as "up," "down," "left," and "right" generally refer to the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of the invention is usually placed when in use.

[0060] The terms “first,” “second,” “third,” etc., are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0061] The terms "parallel" and "perpendicular" do not mean that the components must be absolutely parallel or perpendicular, but rather that they can be slightly tilted. For example, "parallel" simply means that its direction is more parallel than "perpendicular," not that the structure must be completely parallel, but that it can be slightly tilted.

[0062] The terms "horizontal," "vertical," and "sag" do not imply that a component must be absolutely horizontal, vertical, or sagging, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," not that the structure must be completely horizontal, but can be slightly tilted.

[0063] Furthermore, terms like "roughly" and "basically" are used to indicate that the content does not require absolute precision, but rather allows for a certain degree of deviation. For example, "roughly equal" does not simply mean absolute equality; in actual production and operation, achieving absolute "equality" is difficult, and a certain degree of deviation is generally present. Therefore, besides absolute equality, "roughly equal to" also includes the aforementioned situation where a certain degree of deviation exists. Using this as an example, in other cases, unless otherwise specified, terms like "roughly" and "basically" have similar meanings.

[0064] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0065] Figure 1 This is a schematic diagram of the hydraulic circuit provided by the present invention; Figure 2 This is a flowchart of the hydraulic circuit control method provided by the present invention; Figure 3 This is a partial structural schematic diagram of the drilling-type wellbore coring instrument provided by the present invention; Figure 4 This is a structural block diagram of the drilling-type wellbore coring instrument provided by the present invention.

[0066] like Figure 1 , Figure 4As shown, this embodiment provides a hydraulic circuit for use in a drilling-type wellbore coring instrument. The drilling-type wellbore coring instrument includes: a core pusher, a push arm, a drill bit, and a drill bit holding mechanism. The drill bit holding mechanism is used to engage the drill bit during coring to prevent it from shaking. The hydraulic circuit includes:

[0067] Hydraulic main oil circuit 1, wherein an oil pumping mechanism 2 is provided on hydraulic main oil circuit 1;

[0068] The first sub-oil circuit 3 is connected to the main hydraulic oil circuit 1. The first sub-oil circuit 3 is equipped with a first solenoid valve 31, a first control valve 32, a core push rod piston 33, and at least two push arm pistons 34. The first interfaces of the first solenoid valve 31 and the first control valve 32 are connected to the main hydraulic oil circuit 1. The second interface of the first control valve 32 is connected to the second interface of the first solenoid valve 31. The third interface of the first control valve 32 is connected to the first interface of the core push rod piston 33 and the push arm piston 34. The fourth interface of the first control valve 32 is connected to the second interface of the core push rod piston 33 and the push arm piston 34.

[0069] The second sub-oil circuit 4 is connected to the main hydraulic oil circuit 1. The second sub-oil circuit 4 is equipped with a first sequence valve 41, a second solenoid valve 42, a second control valve 43, and a drill bit holding mechanism piston 44. The first interfaces of the second solenoid valve 42 and the first sequence valve 41 are connected to the main hydraulic oil circuit 1. The second interface of the first sequence valve 41 is connected to the first interface of the second control valve 43. The second interface of the second control valve 43 is connected to the second interface of the second solenoid valve 42. The third interface of the second control valve 43 is connected to the first interface of the drill bit holding mechanism piston 44. The fourth interface of the second control valve 43 is connected to the second interface of the drill bit holding mechanism piston 44.

[0070] The third sub-oil circuit 5 is connected to the main hydraulic oil circuit 1. The third sub-oil circuit 5 is equipped with a second sequence valve 51, a third solenoid valve 52, a third control valve 53, and a drill piston 54. The first interface of the third solenoid valve 52 and the second sequence valve 51 is connected to the main hydraulic oil circuit 1. The second interface of the second sequence valve 51 is connected to the first interface of the third control valve 53. The second interface of the third control valve 53 is connected to the second interface of the third solenoid valve 52. The third interface of the third control valve 53 is connected to the first interface of the drill piston 54. The fourth interface of the third control valve 53 is connected to the second interface of the drill piston 54.

[0071] The fourth solenoid valve 6 is disposed between the fourth port of the third control valve 53 and the second port of the drill piston 54, and is used to adjust the pressure value of the drill piston 54.

[0072] Specifically, in this embodiment, the first solenoid valve 31, the second solenoid valve 42, the third solenoid valve 52, and the fourth solenoid valve 6 all function as switches for the corresponding hydraulic circuits. The first solenoid valve 31 acts on the first control valve 32, switching the first sub-circuit 3, thereby controlling the extension and retraction of the core push rod piston 33 and the push arm piston 34 on the first sub-circuit 3, thus adjusting the extension and retraction of the core push rod and the push arm. The second solenoid valve 42 acts on the second control valve 43, switching the second sub-circuit 4, thereby controlling the extension and retraction of the drill bit holding mechanism piston 44. The third solenoid valve 52 acts on the third control valve 53, switching the third sub-circuit 5 and adjusting the extension and retraction of the drill bit piston 54, thus adjusting the drilling trajectory of the drill bit. The fourth solenoid valve 6 is used to continuously adjust the connection between the high-pressure oil circuit and the low-pressure oil circuit of the oil tank during core drilling, and plays a role in controlling the drill bit pressure. During the core drilling process, the duty cycle of the fourth solenoid valve 6 is adjusted through the ground system, thereby realizing real-time full-range adjustment of the drill bit core drilling pressure, which greatly enhances the instrument's adaptability to formations of various hardnesses.

[0073] The first sequence valve 41 and the second sequence valve 51 act as a hydraulic switch. Hydraulic oil is allowed to flow only when the pressure reaches the rated value. If the input pressure is lower than the rated value, the first sequence valve 41 and the second sequence valve 51 are closed, thereby ensuring that the push arm has been opened and the core push rod has been retracted before the hydraulic motor drills into the formation. During core retrieval, the first sequence valve 41 keeps the system at a pressure above the rated pressure to ensure sufficient pushing force and keep the instrument in close contact with the well wall.

[0074] The drill bit is driven by a core-taking mechanical drive system, which consists of a core motor driving a transmission gearbox and the drill bit mechanism to complete the rotary cutting action of the rock core. The core motor is a high-power brushless DC motor, which is controlled by a control drive circuit in the electronic circuitry. The power is directly output to the core drill bit through the transmission gears.

[0075] Furthermore, such as Figure 1 , Figure 4 As shown, the oil pumping mechanism 2 includes:

[0076] The hydraulic motor 21 and the hydraulic pump 22 are used to increase the pressure of the main hydraulic circuit.

[0077] Specifically, in this embodiment, in order to ensure the extension and retraction pressure of the piston in the hydraulic system, a hydraulic motor 21 and a hydraulic pump 22 are provided. The hydraulic motor 21 drives the hydraulic pump 22 to pressurize, thereby increasing the pressure of the main hydraulic oil circuit.

[0078] Furthermore, such as Figure 1 , Figure 4 As shown, the hydraulic circuit also includes:

[0079] The overflow valve assembly 11 is connected to the hydraulic main oil circuit 1 and is used to release pressure when the pressure value in the hydraulic main oil circuit is greater than a preset threshold.

[0080] The overflow valve assembly 11 includes at least two first overflow valves.

[0081] Specifically, in this embodiment, a relief valve assembly 11 is provided on the main hydraulic oil circuit 1, and the relief valve assembly 11 includes at least two first relief valves, which are usually arranged in parallel. When the hydraulic pump 22 is running, it limits the pressure of the hydraulic oil in the system to within the rated pressure of the first relief valve. When the oil pressure in the system exceeds the set value of the relief valve, the high-pressure hydraulic oil flows back to the hydraulic oil tank through the valve body. In addition, the relief valve assembly 11 also acts as a compensator. When the instrument push arm is closed and the wellbore is pulled out, it prevents the pressure of one side of the pipeline from exceeding the rated pressure of the first relief valve. The reason for setting two first relief valves in parallel is to increase the safety of the hydraulic system and avoid the hydraulic system exceeding the rated pressure if one first relief valve is damaged, thereby improving the safety of system operation.

[0082] Furthermore, the hydraulic circuit also includes: a first pressure gauge 71 and a second pressure gauge 72;

[0083] The first pressure gauge 71 is disposed between the oil pumping mechanism 2 and the first control valve 32;

[0084] The second pressure gauge 72 is disposed between the second sequence valve 51 and the third control valve 53.

[0085] Specifically, in this embodiment, the first pressure gauge 71 can be installed on the main hydraulic oil circuit 1 and located at the rear end of the oil pump injection mechanism 2. Its reading displays the output pressure of the hydraulic pump 22. The reading of the second pressure gauge 72 displays the pressure value in the third sub-oil circuit 5 after the second sequence valve 51, thereby accurately grasping the operating status of the hydraulic system and improving the safety of operation.

[0086] Furthermore, such as Figure 1 As shown, the hydraulic circuit also includes:

[0087] The first reverse overflow valve 73 is disposed between the oil pumping mechanism 2 and the first control valve 32 to prevent hydraulic oil backflow.

[0088] Specifically, in this embodiment, a first reverse overflow valve 73 is provided between the oil pump injection mechanism 2 and the first control valve 32 to prevent hydraulic oil backflow when the pressure of the hydraulic pump drops, so as to maintain the pressure of the core push rod piston 33 and the push arm piston 34.

[0089] Furthermore, such as Figure 1 , Figure 4As shown, the hydraulic circuit also includes:

[0090] Multiple pressure compensation valve groups 74 are provided between the third port of the first control valve 32 and the first port of the core pusher piston 33, between the second port of the first sequence valve 41 and the first port of the second control valve 43, and between the second port of the second sequence valve 51 and the first port of the third control valve 53, for compensating the pressure of the corresponding oil circuit.

[0091] The pressure compensation valve group 74 includes: a second relief valve 741 and a second reverse relief valve 742 connected in parallel.

[0092] Specifically, in this embodiment, the pressure compensation valve assembly 74 located between the third port of the first control valve 32 and the first port of the core pusher piston 33 serves to delay the movement of the core pusher by providing a second relief valve 741 between the third port of the first control valve 32 and the first port of the core pusher piston 33 when the instrument is in the downhole coring position. This ensures that the core pusher action occurs after the push arm closes. Additionally, the second reverse relief valve 742 located between the third port of the first control valve 32 and the first port of the core pusher piston 33 provides a delay to allow the push arm to engage before the core pusher begins to retract. When the push arm opens, the pressure continues to rise, causing hydraulic oil to flow back to the oil tank from the top of the piston. Simultaneously, this valve also provides pressure compensation for the extended piston line of the core push rod. A pressure compensation valve assembly 74, located between the second port of the first sequence valve 41 and the first port of the second control valve 43, provides pressure compensation for the downstream pipeline of the first sequence valve 41 when the instrument is in downhole coring operations. Similarly, a pressure compensation valve assembly 74, located between the second port of the second sequence valve 51 and the first port of the third control valve 53, provides pressure compensation for the downstream pipeline of the second sequence valve 51 when the instrument is in downhole coring operations.

[0093] More specifically, in the second relief valve 741 mentioned above, when the oil pressure in the corresponding oil circuit exceeds the relief valve setting value, the high-pressure hydraulic oil flows back to the hydraulic oil tank through the valve body.

[0094] Furthermore, such as Figure 1 , Figure 4 As shown, the hydraulic circuit also includes a third reverse relief valve 75 and a flow control valve 76, which are connected in parallel between the fourth port of the third control valve 53 and the second port of the drill piston 54.

[0095] The flow control valve 76 is used to adjust the retraction speed of the drill piston 54. The flow control valve 76 includes a check valve 761 and a throttle valve 762 connected in parallel.

[0096] Specifically, in this embodiment, a third reverse relief valve 75 is provided between the fourth port of the third control valve 53 and the second port of the drill piston 54. The third reverse relief valve 75 serves as a safety valve, allowing the core motor to retract even if the relief valve is blocked, thus providing redundancy and ensuring safety. The flow control valve 76 is used to decelerate the drill bit during retraction, as there is a risk of core loss due to rapid drill bit retraction. More specifically, the flow control valve consists of a check valve 761 and a throttle valve 762 connected in parallel. This ensures that when hydraulic oil is injected into the drill piston 54, it quickly passes through the check valve 761 into the drill piston 54, extending the drill push rod. During drill bit retraction, the hydraulic oil cannot flow back through the check valve 761; it can only be decelerated by the throttle valve 762 before entering the drill push rod's retraction chamber, ensuring slow drill bit retraction.

[0097] like Figure 2 As shown, this embodiment provides a control method for a hydraulic circuit, applied to the aforementioned hydraulic circuit, the method comprising:

[0098] Confirmation that the core extraction command has been received;

[0099] The control oil pump injection mechanism starts working, and at the same time, the first solenoid valve is energized to control the first control valve to retract the core push rod piston and extend the push arm piston.

[0100] Upon receiving the engagement start command, energize the second solenoid valve to control its operation, causing the drill bit holding mechanism piston to extend.

[0101] Once the engagement is confirmed and the operation is complete, the third solenoid valve is energized to control its operation, causing the drill bit piston to extend and begin drilling. Simultaneously, the fourth solenoid valve is energized to adjust the drilling pressure.

[0102] Once the maximum drilling position signal is received, power to the second solenoid valve is stopped, the second control valve is reset, and the piston of the drill bit holding mechanism is retracted.

[0103] Once the piston retraction signal is received, the duty cycle of the fourth solenoid valve is adjusted to the preset value, the power supply to the third solenoid valve is stopped, the third control valve is reset, and the drill piston retracts.

[0104] Upon receiving the drill bit retraction signal, the power supply to the first solenoid valve is stopped, the first control valve is reset, causing the core pusher piston to extend and the push arm piston to retract.

[0105] Specifically, in this embodiment, a method for controlling a hydraulic circuit is provided:

[0106] First, after confirming that the core extraction command has been received, perform the following operations:

[0107] 1. Push arm opening / core push rod piston retraction: The oil pump injection mechanism starts working, the hydraulic motor is energized to drive the hydraulic pump to rotate, and then the first solenoid valve is energized, allowing pressurized oil to flow to the pilot port of the first control valve. The first control valve actuates, switches the oil circuit, and pushes the push arm piston and the core push rod piston to move. After the two pistons move, the support arm opening and the core push rod retraction are completed.

[0108] 2. Drill bit holding mechanism piston: The push arm piston opens, the push arm presses against the formation, the push arm is preset to the position, when the pressure reading of the first pressure gauge reaches the first rated pressure set by the first sequence valve, the first sequence valve opens, supplies power to the second solenoid valve, so that the second control valve is in the energized state, the high pressure oil drives the piston of the drill bit holding device to move downward until the drill bit holding mechanism engages the drill bit.

[0109] 3. Drilling: When the pressure reading of the second pressure gauge reaches the second rated pressure set by the second sequence valve, the second sequence valve opens. At this time, the third solenoid valve is activated, causing the third control valve to open. High-pressure oil drives the drill bit piston downward, pushing out the guide support and drill bit. After the drill bit contacts the well wall, the drilling pressure is reduced, and the core drilling motor begins core drilling. During drilling, the duty cycle of the fourth solenoid valve is adjusted. When the potentiometer indicates that the drill bit position has reached its maximum, the core drilling motor is turned off (the core drilling motor is de-energized). The second solenoid valve is de-energized, putting the second control valve in the reset state. High-pressure oil drives the drill bit piston to pull the device piston upward until the piston is released. At this time, the duty cycle of the fourth solenoid valve is adjusted to the maximum value, and the pressure on the drill bit piston continuously increases to the maximum value, driving it to move further downward. This will cause the break plate in the motion mechanism to tilt, breaking the core at the root.

[0110] 4. Drill Retraction: When the core breaks, de-energize the third solenoid valve to reset the third control valve. High-pressure oil then drives the drill bit piston upward, retracting the core guide support and drill bit. The flow control valve is used to decelerate the piston of the moving mechanism, ensuring the drill bit is retrieved slowly.

[0111] Push arm closed / core push rod piston extended: When the displacement sensor indicates that the drill bit has returned to its original position and the pressure value measured by the second pressure gauge reaches the rated pressure set by the system, the first solenoid valve is de-energized, the first control valve is reset, the oil circuit is switched, and the push arm piston and the core push rod piston are pushed to move in opposite directions, thus completing the retraction of the push arm and the extension of the core push rod, pushing the drilled core into the core storage tank.

[0112] This embodiment provides a drilling-type wellbore coring instrument, including the aforementioned hydraulic circuit, such as... Figure 3As shown, the drilling-type wellbore coring instrument also includes: a power and hydraulic control sub 100, a motion power sub 101, a motion sub 102, a core storage sub 103, and a coring drill bit 104; the lifting of the upper and lower hydraulic push arms makes the working drill bit side of the probe fit tightly against the wellbore, the drill bit is rotated so that the drill bit direction is perpendicular to the wellbore, the drilling and coring, the breaking of the core, the retraction of the drill bit, and the sequential actions of pushing the core into the core storage tank, in different target layers at different depths, achieves wellbore coring to obtain cores at different depths. The power and hydraulic control section 100 is the power and hydraulic control section of the drilling-type wellbore coring tool, responsible for the power source and hydraulic control of the drilling-type wellbore coring tool; the motion power section 101 provides power for the motion section and core pushing, and is also the mounting carrier of the motion mechanism in the motion section. The hydraulic circuit provides power to the motion mechanism to realize the motion trajectory function of the coring drill bit, and the motor and reducer provide the power for the drill bit to rotate and cut the rock; the motion section 102 is the section for realizing the coring function. In this section, the entire coring action in the oil well is completed, including the rotation of the drill bit, pressing down to cut the rock, breaking the core, core retrieval, and core pushing; the core storage section 103 is pushed to the core storage section by the core pushing mechanism after wellbore coring. The structure of the core storage section determines the number of cores obtained.

[0113] The hydraulic system drive comprises six pistons, which drive corresponding mechanical structures to complete various instrument movements. Its characteristics include high pressure and low displacement. The hydraulic system includes a hydraulic motor, hydraulic pump, and various valves, each controlling the movement of four pistons. The hydraulic control unit is integrated into a single unit. Multiple ultra-thin holes are drilled in the power and hydraulic control section, simultaneously housing the valve body, drilling piston cylinder, and push piston cylinder. The hydraulic system uses hydraulic oil, allowing for smooth motor start-up at room temperature, making it suitable for deep well operations without the need for oil changes or preheating.

[0114] This embodiment provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it implements the above-described hydraulic circuit control method.

[0115] This embodiment provides a readable storage medium storing instructions that cause a machine to execute the aforementioned hydraulic circuit control method.

[0116] The optional embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the embodiments of the present invention are not limited to the specific details in the above embodiments. Within the scope of the technical concept of the embodiments of the present invention, various simple modifications can be made to the technical solutions of the embodiments of the present invention, and these simple modifications all fall within the protection scope of the embodiments of the present invention.

[0117] Those skilled in the art will understand that all or part of the steps in the methods of the above embodiments can be implemented by a program instructing related hardware. This program is stored in a storage medium and includes several instructions to cause a microcontroller, chip, or processor to execute all or part of the steps of the methods described in the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as a USB flash drive, a portable hard drive, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk.

[0118] The optional embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the embodiments of the present invention are not limited to the specific details described above. Within the scope of the technical concept of the embodiments of the present invention, various simple modifications can be made to the technical solutions of the embodiments of the present invention, and these simple modifications all fall within the protection scope of the embodiments of the present invention. It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, the embodiments of the present invention will not describe the various possible combinations separately.

[0119] Furthermore, various different implementations of the present invention can be combined arbitrarily, as long as they do not violate the spirit of the present invention, they should also be regarded as the content disclosed in the present invention.

Claims

1. A hydraulic circuit used in a drilling-type wellbore coring instrument, the drilling-type wellbore coring instrument comprising: The core pusher, push arm, drill bit, and drill bit holding mechanism, wherein the drill bit holding mechanism is used to engage the drill bit during core extraction to prevent the drill bit from shaking, characterized in that the hydraulic circuit includes: The hydraulic main oil circuit (1) is equipped with an oil pump injection mechanism (2); The first sub-oil circuit (3) is connected to the main hydraulic oil circuit (1). The first sub-oil circuit (3) is equipped with a first solenoid valve (31), a first control valve (32), a core push rod piston (33), and at least two push arm pistons (34). The first interfaces of the first solenoid valve (31) and the first control valve (32) are connected to the main hydraulic oil circuit (1). The second interface of the first control valve (32) is connected to the second interface of the first solenoid valve (31). The third interface of the first control valve (32) is connected to the first interface of the core push rod piston (33) and the push arm piston (34). The fourth interface of the first control valve (32) is connected to the second interface of the core push rod piston (33) and the push arm piston (34). The second sub-oil circuit (4) is connected to the main hydraulic oil circuit (1). The second sub-oil circuit (4) is equipped with a first sequence valve (41), a second solenoid valve (42), a second control valve (43), and a drill bit holding mechanism piston (44). The first interfaces of the second solenoid valve (42) and the first sequence valve (41) are connected to the main hydraulic oil circuit (1). The second interface of the first sequence valve (41) is connected to the first interface of the second control valve (43). The second interface of the second control valve (43) is connected to the second interface of the second solenoid valve (42). The third interface of the second control valve (43) is connected to the first interface of the drill bit holding mechanism piston (44). The fourth interface of the second control valve (43) is connected to the second interface of the drill bit holding mechanism piston (44). The third sub-oil circuit (5) is connected to the main hydraulic oil circuit (1). The third sub-oil circuit (5) is equipped with a second sequence valve (51), a third solenoid valve (52), a third control valve (53), and a drill piston (54). The first interface of the third solenoid valve (52) and the second sequence valve (51) is connected to the main hydraulic oil circuit (1). The second interface of the second sequence valve (51) is connected to the first interface of the third control valve (53). The second interface of the third control valve (53) is connected to the second interface of the third solenoid valve (52). The third interface of the third control valve (53) is connected to the first interface of the drill piston (54). The fourth interface of the third control valve (53) is connected to the second interface of the drill piston (54). The fourth solenoid valve (6) is located between the fourth port of the third control valve (53) and the second port of the drill piston (54) for adjusting the pressure value of the drill piston (54).

2. The hydraulic circuit according to claim 1, characterized in that, The oil injection mechanism (2) includes: A hydraulic motor (21) and a hydraulic pump (22) are used to increase the pressure of the main hydraulic circuit.

3. The hydraulic circuit according to claim 1, characterized in that, The hydraulic circuit also includes: The overflow valve assembly (11) is connected to the hydraulic main oil circuit (1) and is used to release pressure when the pressure value in the hydraulic main oil circuit is greater than a preset threshold. The overflow valve assembly (11) includes at least two first overflow valves.

4. The hydraulic circuit according to claim 1, characterized in that, The hydraulic circuit also includes: a first pressure gauge (71) and a second pressure gauge (72); The first pressure gauge (71) is disposed between the oil pumping mechanism (2) and the first control valve (32); The second pressure gauge (72) is located between the second sequence valve (51) and the third control valve (53).

5. The hydraulic circuit according to claim 1, characterized in that, The hydraulic circuit also includes: A first reverse overflow valve (73) is disposed between the oil pumping mechanism (2) and the first control valve (32) to prevent hydraulic oil backflow.

6. The hydraulic circuit according to claim 1, characterized in that, The hydraulic circuit also includes: Multiple pressure compensation valve groups (74) are provided between the third port of the first control valve (32) and the first port of the core pusher piston (33), between the second port of the first sequence valve (41) and the first port of the second control valve (43), and between the second port of the second sequence valve (51) and the first port of the third control valve (53), for compensating the pressure of the corresponding oil circuit; The pressure compensation valve assembly (74) includes a second relief valve (741) and a second reverse relief valve (742) connected in parallel.

7. The hydraulic circuit according to claim 1, characterized in that, The hydraulic circuit also includes a third reverse relief valve (75) and a flow control valve (76), which are connected in parallel between the fourth port of the third control valve (53) and the second port of the drill piston (54). The flow control valve (76) is used to adjust the retraction speed of the drill piston (54).

8. The hydraulic circuit according to claim 7, characterized in that, The flow control valve (76) includes a check valve (761) and a throttle valve (762) connected in parallel.

9. A control method for a hydraulic circuit, applied to the hydraulic circuit according to any one of claims 1-8, characterized in that, The method includes: Confirmation that the core extraction command has been received; The control oil pump injection mechanism starts working, and at the same time, the first solenoid valve is energized to control the first control valve to retract the core push rod piston and extend the push arm piston. Upon receiving the engagement start command, energize the second solenoid valve to control its operation, causing the drill bit holding mechanism piston to extend. Once the engagement is confirmed and the operation is complete, the third solenoid valve is energized to control its operation, causing the drill bit piston to extend and begin drilling. Simultaneously, the fourth solenoid valve is energized to adjust the drilling pressure. Once the maximum drilling position signal is received, power to the second solenoid valve is stopped, the second control valve is reset, and the piston of the drill bit holding mechanism is retracted. Once the piston retraction signal is received, the duty cycle of the fourth solenoid valve is adjusted to the preset value, the power supply to the third solenoid valve is stopped, the third control valve is reset, and the drill piston retracts. Upon receiving the drill bit retraction signal, the power supply to the first solenoid valve is stopped, the first control valve is reset, causing the core pusher piston to extend and the push arm piston to retract.

10. A drilling-type wellbore coring instrument, characterized in that, The hydraulic circuit includes any one of claims 1-8.

11. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the computer program, it implements the hydraulic circuit control method of claim 9.

12. A readable storage medium, characterized in that, The readable storage medium stores instructions for causing the machine to perform the control method of the hydraulic circuit as described in claim 9.

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