Coring mechanism, control method, and drill-in sidewall coring instrument

Abstract

This invention provides a coring mechanism, control method, and drilling-type wellbore coring instrument, belonging to the field of petroleum logging technology. It includes: a base with two fixed plates mounted thereon; a drill bit assembly slidably disposed between the inner walls of the two fixed plates for rotating coring under driving force; a locking mechanism disposed on one side of the base; a limiting mechanism slidably disposed on the outer wall of each fixed plate for limiting the drilling of the drill bit assembly when locked with the locking mechanism, and for displacement under driving force when not locked; and a power transmission mechanism rotatably disposed on the outer wall of each fixed plate for pushing the drill bit assembly to move under driving force and applying drilling pressure to the drill bit assembly during drilling. This invention has a simple structure, high operational stability and reliability, and can improve the coring success rate.

Description

Technical Field

[0001] This invention relates to the field of oil well logging technology, specifically to a coring mechanism, a control method for a coring mechanism, a drilling-type wellbore coring instrument, an electronic device, and a machine-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 instruments require downhole drilling and core extraction, as well as core retrieval, to ensure the integrity and storage of the core. The probe of the coring instrument is its core component, and the stability, reliability, and rationality of its structure, along with the rationality of its operating method, are crucial for wellbore coring. However, most current coring instruments use hydraulically driven motion mechanisms and drill bits for core extraction. The motion mechanism employs a flexible slider structure, which has poor stability; the device lacks a core breakage mechanism, resulting in a low core extraction success rate; and its operational stability and reliability are also poor. Summary of the Invention

[0005] The purpose of this invention is to provide a solution that at least addresses the problems mentioned above, such as the use of hydraulically driven motion mechanisms and drill cores, the use of flexible slider structures in the motion mechanisms resulting in poor stability, the lack of core breakage structures in the devices leading to low core success rates, and poor operational stability and reliability.

[0006] To achieve the above objectives, a first aspect of the present invention provides a core-retrieving mechanism, the core-retrieving mechanism comprising:

[0007] A substrate, on which two fixing plates are disposed opposite each other;

[0008] The drill bit assembly is slidably disposed between the inner walls of two fixed plates, and is used to achieve rotational core extraction under the driving force generated by the first drive mechanism;

[0009] The engaging mechanism is located on one side of the base.

[0010] Each fixed plate has a slidable limiting mechanism on its outer wall. The limiting mechanism is connected to the drill bit assembly and is used to limit the drilling of the drill bit assembly when it is engaged with the locking mechanism, and to generate displacement under the driving force generated by the second driving mechanism when it is not engaged with the locking mechanism.

[0011] Each fixed plate has a power transmission mechanism rotatably mounted on its outer wall. The power transmission mechanism is connected to the drill bit assembly and is used to drive the drill bit assembly to move under the driving force generated by the second drive mechanism, and to apply drilling pressure to the drill bit assembly during the drilling process.

[0012] Optionally, each limiting mechanism includes:

[0013] A limiting plate is connected to a fixed plate on one side. The limiting plate is provided with at least one sliding groove. The limiting plate is slidably connected to the corresponding fixed plate through a first pin of the fixed plate that passes through the sliding groove.

[0014] Each power transmission mechanism includes:

[0015] A power transmission plate is disposed on the other side of the limiting plate. The power transmission plate is provided with a limiting hole. The power transmission plate is rotatably connected to the corresponding fixing plate through a second pin of the fixing plate passing through the limiting hole.

[0016] Optionally, each fixed plate is provided with a first drill bit sliding rail; each limiting plate is provided with a second drill bit sliding rail; and each power transmission plate is provided with a drill bit limiting groove.

[0017] The drill bit assembly includes:

[0018] A push cover is provided with a push shaft, which passes through the first drill bit sliding track on the corresponding fixed plate and the second drill bit sliding track on the corresponding limiting plate and is housed in the drill bit limiting groove on the corresponding power transmission plate;

[0019] The drill bit is rotatably mounted on the push cover via a bearing.

[0020] Optionally, the first drill bit sliding track includes a flip track, a drilling track, and at least one break track connected in sequence.

[0021] Optionally, the first drive mechanism includes:

[0022] The first power mechanism has its power output end connected to the drill bit via gears to generate driving force.

[0023] Optionally, each fixed plate is provided with a first power slider track; each limiting plate is provided with a second power slider track; and each power transmission plate is provided with a power slider limiting groove.

[0024] The second drive mechanism includes:

[0025] A power slide rail is mounted on the base and located between two fixed plates;

[0026] A power slider is slidably mounted on the power slide rail. The power slider is provided with a slider shaft. The slider shaft passes through the first power slider track on the corresponding fixed plate and the second power slider track on the corresponding limiting plate and is housed in the power slider limiting groove on the corresponding power transmission plate.

[0027] The second power mechanism has its power output end connected to the power slider to generate driving force.

[0028] Optionally, the power slide rail is provided with a cavity for receiving; the core-taking mechanism further includes:

[0029] The core pusher is telescopically mounted in the receiving cavity of the power slide rail. After core sampling is completed, it extends under the driving force generated by the third drive mechanism to push the core out of the drill bit assembly.

[0030] Optionally, each fixed plate and the two limiting plates are provided with limiting slots;

[0031] The engaging mechanism is disposed on one side of the base, and the engaging mechanism includes:

[0032] lever;

[0033] The fourth drive mechanism has a power output end connected to a locking rod. Under the driving force generated by the fourth drive mechanism, the locking rod extends into the limiting slots of the two fixed plates and the two limiting plates, and engages with the two fixed plates and the two limiting plates to limit the drilling of the drill bit assembly.

[0034] A second aspect of the present invention provides a control method for a core-retrieving mechanism, applied to the aforementioned core-retrieving mechanism, the method comprising:

[0035] Confirmation that the core extraction command has been received;

[0036] The locking mechanism starts working until it engages with the two limit mechanisms.

[0037] Once the engagement completion command is received, the second drive mechanism is controlled to start working to move the drill bit to the core-taking position;

[0038] Once the displacement completion command is received, the first drive mechanism is controlled to start working, enabling the drill bit assembly to rotate and collect the core.

[0039] Upon receiving the core extraction completion command, the system controls the first drive mechanism and the locking mechanism to stop working, and then controls the second drive mechanism to move the drill bit assembly to the preset position before moving the drill bit assembly to the initial position.

[0040] A third aspect of the present invention provides a drilling-type wellbore coring instrument, including the coring mechanism described above.

[0041] A fourth aspect of the present invention provides 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 control method of the core-taking mechanism described above.

[0042] A fifth aspect of the present invention provides a machine-readable storage medium storing instructions for causing a machine to perform the control method of the core-taking mechanism described above.

[0043] This solution mounts the drill bit assembly on a fixed plate and drives it through a power transmission mechanism. It also incorporates a limiting mechanism and a locking mechanism to limit the drill bit assembly. The overall structure is simple, which reduces the vibration of the drill bit assembly during drilling. It has high working stability and reliability, and can further improve the success rate of coring.

[0044] 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

[0045] 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:

[0046] Figure 1 This is an exploded structural diagram of the core-taking mechanism before the drill bit assembly is flipped, as provided by the present invention.

[0047] Figure 2 This is a partial structural schematic diagram of the core-taking mechanism provided by the present invention;

[0048] Figure 3 This is a schematic diagram of the drill bit assembly provided by the present invention;

[0049] Figure 4 This is a schematic diagram of the structure of the fixing plate provided by the present invention;

[0050] Figure 5 This is a schematic diagram of the limiting mechanism provided by the present invention;

[0051] Figure 6 This is a schematic diagram of the power transmission mechanism provided by the present invention;

[0052] Figure 7 This is a flowchart of the control method for the core-taking mechanism provided by the present invention;

[0053] Figure 8 This is a schematic diagram of the structure of the drilling-type wellbore coring instrument provided by the present invention;

[0054] Figure 9 This is a hydraulic schematic diagram of the core-taking mechanism provided by the present invention.

[0055] Explanation of reference numerals in the attached figures

[0056] 1-Base; 2-Fixing plate; 3-Drill bit assembly;

[0057] 4-First driving mechanism; 5-Limiting mechanism; 6-Clamping mechanism;

[0058] 7-Second drive mechanism; 8-Power transmission mechanism; 21-First drill bit sliding track;

[0059] 22-First power slider track; 31-Push cover; 32-Push shaft;

[0060] 33-Drill bit; 51-Limit plate; 52-Sliding groove;

[0061] 53 - Second drill bit sliding rail; 54 - Second power slider rail; 71 - Power slide rail;

[0062] 72-Power slider; 81-Power transmission plate; 82-Limiting hole;

[0063] 83-Drill bit limiting groove; 84-Power slider limiting groove; 211-Tilting track;

[0064] 212-Drilling rail; 213-Broken rail; 601-Limiting slot;

[0065] 711 - Accommodating cavity; 721 - Slider shaft. Detailed Implementation

[0066] 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 present invention.

[0067] 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.

[0068] The terms “first”, “second”, etc., are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0069] 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.

[0070] 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.

[0071] 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.

[0072] 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.

[0073] Figure 1 This is a schematic diagram of the core-taking mechanism provided by the present invention; Figure 2 This is a partial structural schematic diagram of the core-taking mechanism before the drill bit assembly flips, provided by the present invention. Figure 3 This is a schematic diagram of the drill bit assembly provided by the present invention; Figure 4 This is a schematic diagram of the structure of the fixing plate provided by the present invention; Figure 5 This is a schematic diagram of the limiting mechanism provided by the present invention; Figure 6 This is a schematic diagram of the power transmission mechanism provided by the present invention;

[0074] Figure 7 This is a flowchart of the control method for the core-taking mechanism provided by the present invention; Figure 8 This is a schematic diagram of the structure of the drilling-type wellbore coring instrument provided by the present invention; Figure 9 This is a hydraulic schematic diagram of the core-taking mechanism provided by the present invention.

[0075] like Figure 1-2 As shown, this embodiment provides a core-retrieving mechanism, which includes:

[0076] The base 1 has two fixing plates 2 arranged opposite to each other, forming an accommodating space between the two fixing plates 2;

[0077] The drill bit assembly 3 is slidably disposed between the inner walls of the two fixed plates 2 and located within the accommodating space, and is used to achieve rotational core extraction under the driving force generated by the first driving mechanism 4.

[0078] The engaging mechanism 6 is located on one side of the base 1;

[0079] Two limiting mechanisms 5 are set opposite to each other. Each fixed plate 2 can be slidably provided with a limiting mechanism 5 on its outer wall. The limiting mechanism 5 is connected to the drill bit assembly 3 and is used to limit the drilling of the drill bit assembly 3 when it is engaged with the locking mechanism 6, and to generate displacement under the driving force generated by the second driving mechanism 7 when it is not engaged with the locking mechanism 6.

[0080] Two power transmission mechanisms 8 are arranged opposite to each other. Each fixed plate 2 has a power transmission mechanism 8 rotatably mounted on its outer wall. The power transmission mechanism 8 is connected to the drill bit assembly 3 and is used to push the drill bit assembly 3 to move under the driving force generated by the second drive mechanism 7, and to apply drilling pressure to the drill bit assembly 3 during the drilling process.

[0081] Specifically, in this embodiment, the base 1 serves as a load-bearing structure, and two fixing plates 2 are arranged opposite each other on the base 1, forming a receiving space between the two fixing plates 2. The drill bit assembly 3 is slidably mounted on the two fixing plates 2 and located within the receiving space, thereby restricting the movement direction of the drill bit assembly 3 and protecting it. In addition, to ensure the stability of the drill bit assembly 3 during drilling, a limiting mechanism 5 can be slidably mounted on the outer wall of each fixing plate 2, and a corresponding engaging mechanism 6 is provided to engage with it, thereby limiting the drill bit assembly 3. Secondly, to drive the drill bit assembly 3 and achieve core drilling, a power transmission mechanism 8 can be rotatably mounted on the outer wall of each fixing plate 2. The power transmission mechanism 8 is connected to the drill bit assembly 3 and is used to push the drill bit assembly 3 to move under the driving force generated by the second driving mechanism 7, and to apply drilling pressure to the drill bit assembly 3 during drilling, completing one cycle of drill bit assembly 3 flipping, drill bit drilling, core turning, drill bit retraction, and drill bit reset. The above-described structure enables the movement and limiting of the drill bit assembly 3. The overall structure is simple and has high operational stability, which can effectively improve the core sampling quality.

[0082] Furthermore, such as Figure 1-2 As shown in Figures 5-6, each limiting mechanism 5 includes:

[0083] A limiting plate 51 is disposed on one side of the fixed plate 2, and one side of the limiting plate 51 is connected to the fixed plate 2. At least one sliding groove 52 is provided on the limiting plate 51, and the limiting plate 51 is slidably connected to the corresponding fixed plate 2 through a first pin of the fixed plate 2 that passes through the sliding groove 52.

[0084] Each power transmission mechanism 8 includes:

[0085] A power transmission plate 81 is disposed on the other side of the limiting plate 51 away from the fixing plate 2. The power transmission plate 81 is provided with a limiting hole 82. The power transmission plate 81 is rotatably connected to the corresponding fixing plate 2 through a second pin of the fixing plate 2 that passes through the limiting hole 82.

[0086] Specifically, in this embodiment, the limiting mechanism 5 is set as a limiting plate 51, and at least one sliding groove 52 is provided on the limiting plate 51. The limiting plate 51 is slidably connected to one side of the corresponding fixing plate 2 through a first pin passing through the sliding groove 52. The limiting plate 51 changes from a floating state to a fixed state, thereby limiting the installation and displacement path of the limiting plate 51, and ensuring that the limiting plate 51 can change from a fixed state to a floating state when it is not engaged with the engaging mechanism 6. Under the driving force generated by the second driving mechanism 7, it moves relative to the fixed plate. The fixed plate 2 undergoes a small displacement (resulting in a certain angle of tilt); the power transmission mechanism 8 is configured as a power transmission plate 81, located on the side of the limiting plate 51 away from the fixed plate 2. The power transmission plate 81 has a limiting hole 82. The power transmission plate 81 is rotatably connected to the corresponding fixed plate 2 via a second pin passing through the limiting hole 82, thus limiting the installation and displacement path of the limiting plate 51 and ensuring rotation under the driving force generated by the second drive mechanism 7. This point-based positioning allows for circumferential rotation, thereby driving the drill bit assembly 3 to move. This structure achieves both driving force transmission and drill bit positioning, resulting in a simple structure and low maintenance costs.

[0087] Furthermore, such as Figure 3-6 As shown, both fixed plates 2 are provided with a first drill bit sliding rail 21; both limiting plates 51 are provided with a second drill bit sliding rail 53; both power transmission plates 81 are provided with a drill bit limiting groove 83.

[0088] The drill bit assembly 3 includes:

[0089] A push cover 31 is provided with a push shaft 32 opposite to it. The push shaft 32 passes through the first drill bit sliding track 21 on the corresponding fixed plate 2 and the second drill bit sliding track 53 on the corresponding limiting plate 51 and is located in the drill bit limiting groove 83 on the corresponding power transmission plate 81.

[0090] The drill bit 33 is rotatably mounted on the push cover 31 via a bearing.

[0091] Specifically, in this embodiment, since a thrust needs to be applied to the drill bit 33 during the core extraction process, a push cover 31 is provided to bear the thrust in order to ensure the normal rotation of the drill bit 33. The drill bit 33 is rotatably mounted on the push cover 31 through a bearing, so that the drill bit 33 can move with the push cover 31. In order to ensure the stability of the movement of the drill bit assembly 3, push shafts 32 are provided opposite to each other on both sides of the push cover 31. At the same time, a first drill bit sliding track 21 is provided on both fixed plates 2, a second drill bit sliding track 53 is provided on both limiting plates 51, and a drill bit limiting groove 83 is provided on both power transmission plates 81. Each push shaft 32 passes through the first drill bit sliding track 21 on the corresponding fixed plate 2 and the second drill bit sliding track 53 on the corresponding limiting plate 51 and is housed in the drill bit limiting groove 83 on the corresponding power transmission plate 81, thereby driving the push cover 31 and limiting the displacement path of the push cover 31.

[0092] Furthermore, such as Figure 4 As shown, the first drill bit sliding track 21 includes a flip track 211, a drilling track 212 and at least one broken track 213 connected in sequence.

[0093] Specifically, in this embodiment, the first drill bit sliding track 21 includes a flip track 211, a drilling track 212, and at least one break track 213 connected in sequence. This allows the drill bit assembly 3 to move while the drill bit 33 is in the flip track 211, where it is horizontal. When the drill bit 33 moves from the flip track 211 to the drilling track 212, it changes from horizontal to vertical. The greater the displacement within the drilling track 212, the deeper the drilling depth. After drilling is completed, a certain tilt angle needs to be applied to the drill bit 33 to break the core. Therefore, a break track 213 connected to the drilling track 212 is provided. As the drill bit assembly 3 continues to move, when the drill bit 33 moves from the drilling track 212 to the break track 213, it deflects, causing the core to break. In addition, since the drill bit 33 cannot be fixed at the drilling completion position due to the influence of mechanical structure and rock strata characteristics, it can only be within a certain area. At least one (usually two) break rails 213 can be set to cover this area in sequence to ensure that the drill bit assembly 3 can be drawn into one of the break rails 213, thereby completing the core-breaking action.

[0094] Furthermore, the first drive mechanism 4 includes:

[0095] The first power mechanism has its power output end connected to the drill bit 33 via gears to generate driving force.

[0096] Specifically, in this embodiment, the first power mechanism adopts a drive motor, and the drive shaft of the drive motor is connected to the drill bit 33 through gear meshing. The rotational driving force generated when the drive motor is working drives the drill bit 33 to rotate, thereby realizing rotary coring.

[0097] Furthermore, such as Figure 1-2 As shown, both fixed plates 2 are provided with a first power slider track 22; both limiting plates 51 are provided with a second power slider track 54; and both power transmission plates 81 are provided with a power slider limiting groove 84.

[0098] The second drive mechanism 7 includes:

[0099] The power slide rail 71 is mounted on the base 1 and located in the accommodating space between the two fixed plates 2;

[0100] A power slider 72 is slidably mounted on the power slide rail 71. A slider shaft 721 is disposed opposite to the power slider 72. The slider shaft 721 passes through the first power slider track 22 on the corresponding fixed plate 2 and the second power slider track 54 on the corresponding limiting plate 51 and is housed in the power slider limiting groove 84 on the corresponding power transmission plate 81.

[0101] The second power mechanism has its power output end connected to the power slider 72 to generate driving force.

[0102] Specifically, in this embodiment, in order to drive the drill bit assembly 3, a second power mechanism is provided to push the power slider 72, which is provided on the power slide rail 71, to move. In order to ensure that the pushing force is more uniform during the pushing process, a slider shaft 721 is provided on the power slider 72, and a first power slider track 22 is provided on both fixed plates 2. A second power slider track 54 is provided on both limiting plates 51. A power slider limiting groove 84 is provided on both power transmission plates 81. The two slider shafts 721 pass through the first power slider track 22 on the corresponding fixed plate 2 and the second power slider track 54 on the corresponding limiting plate 51, respectively, and are located in the power slider limiting groove 84 on the corresponding power transmission plate 81, thereby realizing the transmission of the pushing force. When the second power mechanism generates driving force, the power slider 72 moves on the power slide rail 71, and since the slider shaft 721 is in the corresponding power slider limiting groove 84, it directly drives the power transmission plate 81 to rotate, thereby realizing the movement and flipping of the drill bit 33. At the same time, the slider shaft 721 moves within the first power slider track 22 and the second power slider track 54.

[0103] Furthermore, such as Figure 1-2 As shown, the power slide rail 71 is provided with a receiving cavity 711; the core-taking mechanism further includes:

[0104] The core pusher 9 is telescopically mounted in the receiving cavity of the power slide rail 71. After core sampling is completed, it extends under the driving force generated by the third drive mechanism to push out the core from the drill bit assembly 3.

[0105] Specifically, in this embodiment, after coring is completed and the core is broken, the core is housed inside the drill bit 33. Therefore, in order to drill cores from multiple different locations, the core inside the drill bit 33 needs to be pushed into the core storage cylinder. Thus, a receiving cavity 711 is provided along the length of the power slide rail 71, and a core pusher 9 is slidably installed within the receiving cavity 711 so that after coring is completed, it extends under the driving force generated by the third drive mechanism to push the core out of the drill bit assembly 3. Preferably, the third drive mechanism can be a telescopic structure such as a hydraulic cylinder or an electric cylinder.

[0106] Furthermore, such as Figure 1-2 As shown in Figures 4-6, limit slots 601 are provided on both fixed plates 2 and both limiting plates 51;

[0107] The engaging mechanism 6 is disposed on one side of the base 1, and the engaging mechanism 6 includes:

[0108] The fourth drive mechanism 61 has a power output end connected to a locking rod 62. Under the driving force generated by the fourth drive mechanism 61, the locking rod 62 extends into the limiting slots 601 of the two fixed plates 2 and the two limiting plates 51, and engages with the two fixed plates 2 and the two limiting plates 51 to limit the drilling of the drill bit assembly 3.

[0109] Specifically, in this embodiment, when the second drive mechanism 7 generates driving force, it can push the drill bit assembly 3 to move through the two power transmission mechanisms 8. Therefore, the power transmission mechanism 8 and the drill bit assembly 3 are not rigidly connected. Thus, during the core drilling process, the drill bit 33 may vibrate due to its own rotation. Therefore, limiting slots 601 are provided on the two fixed plates 2 and the two limiting plates 51, and a locking mechanism 6 is provided. The locking mechanism 6 includes a fourth drive mechanism 61. The power output end of the fourth drive mechanism 61 is connected to a locking rod 62. Through the driving force generated by the fourth drive mechanism 61, the locking rod 62 can be inserted into the limiting slots 601 of the two fixed plates 2 and the two limiting plates 51 and locked with the two fixed plates 2 and the two limiting plates 51 to limit the drill bit assembly 3, so as to ensure that the drill bit 33 can remain stable during the core drilling process and improve the core drilling quality.

[0110] like Figure 7As shown, this embodiment also provides a control method for a core-taking mechanism, applied to the aforementioned core-taking mechanism, the method comprising:

[0111] Confirmation that the core extraction command has been received;

[0112] The locking mechanism starts working until it engages with the two limit mechanisms.

[0113] Once the engagement completion command is received, the second drive mechanism is controlled to start working to move the drill bit to the core-taking position;

[0114] Once the displacement completion command is received, the first drive mechanism is controlled to start working, enabling the drill bit assembly to rotate and collect the core.

[0115] Upon receiving the core extraction completion command, the system controls the first drive mechanism and the locking mechanism to stop working, and then controls the second drive mechanism to move the drill bit assembly to the preset position before moving the drill bit assembly to the initial position.

[0116] This embodiment also provides a drilling-type wellbore coring instrument, including the coring mechanism described above, such as... Figure 8 As shown, it also includes:

[0117] The system includes a power and hydraulic control subsection 100, a motion power subsection 101, a motion subsection 102, and a core storage subsection 103. The core sampling mechanism 104 is located in the motion subsection 102. The lifting of the upper and lower hydraulic push arms causes the working drill bit side of the probe to be pressed against the well wall. The drill bit is rotated so that its direction is perpendicular to the well wall. The drilling and core sampling, core breaking, drill retraction, and core pushing into the core storage tank are performed sequentially. These actions enable core sampling at different depths in target layers 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 instrument, responsible for the power source and hydraulic control of the drilling-type wellbore coring instrument; the motion power section 101 provides power for the motion section and core pushing, and is also the mounting carrier of the coring mechanism in the motion section 102. The hydraulic circuit provides power to the coring mechanism to realize the movement 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 that realizes 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.

[0118] 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.

[0119] like Figure 9 As shown, the hydraulic system specifically includes:

[0120] The hydraulic main oil circuit is equipped with an oil injection mechanism, which includes a hydraulic motor and a hydraulic pump, used to increase the pressure of the hydraulic main oil circuit.

[0121] 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 SQ1, a second solenoid valve SOL2, a second control valve CV2, and a fourth drive mechanism piston. The first interfaces of the second solenoid valve SOL2 and the first sequence valve SQ1 are connected to the main hydraulic oil circuit. The second interface of the first sequence valve SQ1 is connected to the first interface of the second control valve CV2. The second interface of the second control valve CV2 is connected to the second interface of the second solenoid valve SOL2. The third interface of the second control valve CV2 is connected to the first interface of the fourth drive mechanism piston. The fourth oil inlet of the second control valve CV2 is connected to the second interface of the fourth drive mechanism piston.

[0122] 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 SQ2, a third solenoid valve SOL3, a third control valve CV3, and a drill piston. The first interface of the third solenoid valve SOL3 and the second sequence valve SQ2 is connected to the main hydraulic oil circuit. The second interface of the second sequence valve SQ2 is connected to the first interface of the third control valve CV3. The second interface of the third control valve CV3 is connected to the second interface of the third solenoid valve SOL3. The third interface of the third control valve CV3 is connected to the first interface of the drill piston. The fourth interface of the third control valve CV3 is connected to the second interface of the drill piston.

[0123] The fourth solenoid valve SOL4 is located between the fourth port of the third control valve CV3 and the second port of the drill piston, and is used to adjust the pressure value of the drill piston.

[0124] Specifically, in this embodiment, the second solenoid valve SOL2, the third solenoid valve SOL3, and the fourth solenoid valve SOL4 all function as switches for their respective hydraulic circuits. The second solenoid valve SOL2 acts on the second control valve CV2, reversing the second sub-circuit and thus controlling the extension and retraction of the drill bit holding mechanism piston. The third solenoid valve SOL3 acts on the third control valve CV3, reversing the third sub-circuit and extending and retracting the drill bit piston, thereby adjusting the drill bit's trajectory during drilling and retraction. The fourth solenoid valve SOL4 continuously adjusts the connection between the high-pressure hydraulic circuit for core drilling and the low-pressure hydraulic circuit in the oil tank, controlling the drill bit pressure. During core drilling, the duty cycle of the fourth solenoid valve SOL4 is adjusted via the ground system, enabling real-time, full-range adjustment of the drill bit's core drilling pressure, significantly enhancing the instrument's adaptability to formations of varying hardness. The first sequence valve SQ1 and the second sequence valve SQ2 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 SQ1 and the second sequence valve SQ2 are closed, thus ensuring that the push arm has been opened and the core push rod has been retracted before the hydraulic motor drills into the formation.

[0125] The hydraulic circuit also includes:

[0126] A pressure compensation valve group is provided between the second port of the first sequence valve SQ1 and the first port of the second control valve CV2, and between the second port of the second sequence valve SQ2 and the first port of the third control valve CV3, for compensating the pressure of the corresponding oil circuit; the pressure compensation valve group includes: a relief valve RV and a reverse relief valve RVR connected in parallel.

[0127] Specifically, in this embodiment, a pressure compensation valve group disposed between the second port of the first sequence valve SQ1 and the first port of the second control valve CV2 is used to provide pressure compensation for the downstream pipeline of the first sequence valve SQ1 when the instrument is in the downhole coring operation; a pressure compensation valve group disposed between the second port of the second sequence valve SQ2 and the first port of the third control valve CV3 is used to provide pressure compensation for the downstream pipeline of the second sequence valve SQ2 when the instrument is in the downhole coring operation.

[0128] More specifically, in the aforementioned relief valve RV, 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.

[0129] Furthermore, a reverse relief valve RVR and a flow control valve are connected in parallel between the fourth port of the third control valve CV3 and the second port of the drill piston; the flow control valve is used to adjust the retraction speed of the drill piston. The flow control valve includes a check valve V1 and a throttle valve V2 connected in parallel.

[0130] Specifically, in this embodiment, a reverse relief valve RVR is installed between the fourth port of the third control valve CV3 and the second port of the drill bit piston. The reverse relief valve RVR acts as a safety valve, allowing the core motor to retract even if the relief valve is blocked, serving as a redundancy design to ensure safety. A flow control valve is used to decelerate the drill bit during retraction, as there is a risk of core loss due to rapid drill bit retraction after core extraction. More specifically, the flow control valve consists of a check valve V1 and a throttle valve V2 connected in parallel. This ensures that when hydraulic oil is injected into the drill bit piston, it is quickly pumped into the piston through the check valve V1, causing the drill bit push rod to extend. During drill bit retraction, the hydraulic oil cannot flow back through the check valve V1; it can only be decelerated by the throttle valve V2 before entering the drill bit push rod's retraction chamber, ensuring slow drill bit retraction.

[0131] In summary, this embodiment also provides a movement step of the core-taking mechanism, including:

[0132] 1. Pre-drilling: Under the action of the hydraulic control system cylinder, the piston of the fourth drive mechanism is tightened, and the chuck 62 is connected to the limiting slot 601 of the limiting plate 51 through the fixing plate 2. The fixing plate 2 is pulled and fixed, and the limiting plate 51 is pulled to prevent the vibration of the limiting plate 51 from causing the drill bit assembly 3 to shake, thus ensuring the stability of the core extraction process.

[0133] 2. Drill bit flipping: Under the push of the hydraulic control system cylinder, the power slider 72 moves along the X direction on the power slide rail 71. The slider shaft 721 slides in the first power slider track 22 of the fixed plate 2, the second power slider track 54 of the limiting plate 51, and the power slider limiting groove 84 of the power transmission plate 81. The drill bit limiting groove 83 of the power transmission plate 81 drives the push shaft 32 of the drill bit assembly 3, which in turn drives the drill bit assembly 3 to move in the first power slider track 22 of the fixed plate 2. When the slider shaft 721 of the power slider 72 moves to the drill bit flipping point of the fixed plate 2, the push cover 31 in the drill bit assembly 3 runs from the first power slider track 22 in the fixed plate 2 to the drill bit reversal point of the second drill bit sliding track 53 to complete the drill bit flipping to the Y direction, and the drill bit is perpendicular to the formation.

[0134] 3. Drilling: The motor drives the transmission gear through the reduction mechanism. The transmission gear meshes with the gear of the drill bit assembly 3, causing the drill bit to rotate. Under the push of the hydraulic control system cylinder, the power slider 72 moves along the X direction on the power slide rail 71. The slider shaft 721 slides in the first power slider track 22 of the fixed plate 2 and the power slider limiting groove 84 of the power transmission plate 81. The drill bit limiting groove 83 of the power transmission plate 81 drives the push shaft 32 of the drill bit assembly 3, which in turn drives the drill bit assembly to move along the Y direction in the first drill bit sliding track 21 of the fixed plate 2, and begins to core cut the rock strata.

[0135] 4. Core Breaking: Under the push of the hydraulic control system cylinder, the power slider 72 moves along the X-direction on the power slide rail 71, and the slider shaft 721 moves to the breakage track 213 of the fixed plate 2. At this time, the slider shaft 721 moves along the breakage track 213 in the X-direction, the drill bit feeds to the maximum value, the drill bit assembly 3 completes the core breaking action, the drill bit assembly 3 works to the limit position of the core breaking action, the hydraulic system releases the locking rod 62, pulls the locking rod 62 on the piston to release the limiting plate 51, the hydraulic system pushes the power slide shaft 28 to move in the Z-direction within the breakage track 213 of the fixed plate, and drives the limiting plate 51 to move in the Z-direction. The limiting plate 51 flips, and the second drill bit slide rail 53 of the limiting plate 51 drives the push shaft 32 of the drill bit assembly 3 to move in the breakage track 213, so that the drill bit assembly 3 completes an angle with the X-direction. The size of the angle is determined by the angle between the breakage groove and the X-direction, thus completing the core breaking.

[0136] 5. Drill retraction and drill bit reset: The drill retraction process is the reverse movement of the drill bit assembly drilling and the drill bit flipping.

[0137] 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 control method of the core extraction mechanism described above.

[0138] This embodiment provides a machine-readable storage medium storing instructions for causing a machine to execute the control method of the core-taking mechanism described above.

[0139] 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.

[0140] 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 further describe the various possible combinations.

[0141] Furthermore, various different embodiments of the present invention can be combined in any way, as long as they do not violate the spirit of the embodiments of the present invention, they should also be regarded as the content disclosed by the embodiments of the present invention.

Claims

1. A coring mechanism characterized by, The core-collecting mechanism includes: A substrate (1) on which two fixing plates (2) are disposed opposite each other; The drill bit assembly (3) is slidably disposed between the inner walls of the two fixed plates (2) and is used to achieve rotational core extraction under the driving force generated by the first drive mechanism (4). The engaging mechanism (6) is located on one side of the base (1); Each fixed plate (2) has a limiting mechanism (5) slidably installed on its outer wall. The limiting mechanism (5) is connected to the drill bit assembly (3) and is used to limit the drilling of the drill bit assembly (3) when it is engaged with the locking mechanism (6), and to generate displacement under the driving force generated by the second driving mechanism (7) when it is not engaged with the locking mechanism (6). Each fixed plate (2) has a power transmission mechanism (8) rotatably mounted on its outer wall. The power transmission mechanism (8) is connected to the drill bit assembly (3) and is used to push the drill bit assembly (3) to move under the driving force generated by the second drive mechanism (7), and to apply drilling pressure to the drill bit assembly (3) during the drilling process.

2. The coring mechanism of claim 1, wherein, Each limiting mechanism (5) includes: The limiting plate (51) is connected to the fixing plate (2) on one side. The limiting plate (51) is provided with at least one sliding groove (52). The limiting plate (51) is slidably connected to the corresponding fixing plate (2) through the first pin of the fixing plate (2) that passes through the sliding groove (52). Each power transmission mechanism (8) includes: A power transmission plate (81) is provided on the other side of the limiting plate (51). The power transmission plate (81) is provided with a limiting hole (82). The power transmission plate (81) is rotatably connected to the corresponding fixing plate (2) through the second pin of the fixing plate (2) that passes through the limiting hole (82).

3. The coring mechanism of claim 2, wherein, Each fixed plate (2) is provided with a first drill bit sliding rail (21); each limiting plate (51) is provided with a second drill bit sliding rail (53); each power transmission plate (81) is provided with a drill bit limiting groove (83); The drill bit assembly (3) includes: Push cover (31), on which a push shaft (32) is provided, the push shaft (32) passes through the first drill bit sliding track (21) on the corresponding fixed plate (2) and the second drill bit sliding track (53) on the corresponding limiting plate (51) and is housed in the drill bit limiting groove (83) on the corresponding power transmission plate (81); The drill bit (33) is rotatably mounted on the push cover (31) via a bearing.

4. The coring mechanism of claim 3, wherein, The first drill bit sliding track (21) includes a flip track (211), a drilling track (212), and at least one break track (213) connected in sequence.

5. The coring mechanism of claim 3, wherein, The first drive mechanism (4) includes: The first power mechanism has its power output end connected to the drill bit (33) via gears to generate driving force.

6. The coring mechanism of claim 2, wherein, Each fixed plate (2) is provided with a first power slider track (22); each limiting plate (51) is provided with a second power slider track (54); each power transmission plate (81) is provided with a power slider limiting groove (84); The second drive mechanism (7) includes: A power slide rail (71) is mounted on the base (1) and located between two fixed plates (2); A power slider (72) is slidably mounted on the power slide rail (71). A slider shaft (721) is provided on the power slider (72), and the slider shaft (721) passes through the corresponding fixed plate (2). The first power slider track (22) and the second power slider track (54) on the corresponding limiting plate (51) are housed in the power slider limiting groove (84) on the corresponding power transmission plate (81); The second power mechanism has its power output end connected to the power slider (72) to generate driving force.

7. The coring mechanism of claim 6, wherein, The power slide rail (71) is provided with a receiving cavity (711); the core extraction mechanism further includes: The core push rod (9) is telescopically installed in the receiving cavity of the power slide rail (71) and is used to extend under the driving force generated by the third drive mechanism after core taking is completed, so as to push out the core in the drill bit assembly (3).

8. The coring mechanism of claim 2, wherein, Each fixed plate (2) and each limiting plate (51) is provided with a limiting slot (601); The engaging mechanism (6) includes: lever (62); The fourth drive mechanism (61) has a power output end connected to a locking rod (62). Under the driving force generated by the fourth drive mechanism (61), the locking rod (62) extends into the limiting slots (601) of the two fixed plates (2) and the two limiting plates (51) and engages with the two fixed plates (2) and the two limiting plates (51) to limit the drilling of the drill bit assembly (3).

9. A method of controlling a coring mechanism according to any one of claims 1 to 8, characterized in that The method includes: Confirmation that the core extraction command has been received; The locking mechanism starts working until it engages with the two limit mechanisms. Once the engagement completion command is received, the second drive mechanism is controlled to start working to move the drill bit to the core-taking position; Once the displacement completion command is received, the first drive mechanism is controlled to start working, enabling the drill bit assembly to rotate and collect the core. Upon receiving the core extraction completion command, the system controls the first drive mechanism and the locking mechanism to stop working, and then controls the second drive mechanism to move the drill bit assembly to the preset position before moving the drill bit assembly to the initial position.

10. A drill-in sidewall coring instrument characterized by, The core-taking mechanism 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 control method of the core-taking mechanism as described in claim 9.

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

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