Coring nipple and method of drilling type side-wall coring instrument

Abstract

The invention discloses a coring nipple and a coring method of a drilling type side wall coring instrument. The coring nipple comprises an electronic circuit, a hydraulic control nipple, a motion power nipple, a motion nipple and a core storage nipple which are arranged in sequence. A coring drill bit is mounted on the outer side of the movable short section; the moving track of the drill bit is hydraulically pushed, cutting feeding of the drill bit is achieved through the motor, and the reliability of the moving track of the drill bit and cutting feeding of the drill bit is guaranteed. The method is used for solving the problems of unstable cutting feeding, easy damage and low coring efficiency caused by complex application of a large number of valve bodies in a hydraulic loop due to the fact that a drill bit is hydraulically pushed to move along a track and cut cores are fed in the prior art. The motion trail of the drill bit is hydraulically controlled, the structural mode that the drill bit is electrically controlled to rotationally cut rocks is adopted, and the stability and reliability of the drilling type well wall coring device are guaranteed through a unique mechanical structure.

Description

Technical Field

[0001] The invention belongs to the technical field of petroleum well logging, and in particular to a coring pup joint of a drilling-type well wall coring instrument and a method. Background Art

[0002] With the development of well logging technology, oilfield exploration and reservoir development are becoming more and more complicated. It has become an important task to use core analysis to determine the permeability and formation pressure gradient of the reservoir. Geological exploration increasingly needs to obtain data such as fluid saturation, reservoir pressure, relative humidity of oil layers and reservoir properties of heterogeneous layers under bottom hole conditions that are closer to the actual formation conditions. The market urgently needs large-diameter well wall coring technology to meet oilfield service needs and solve complex reservoir exploration and development problems.

[0003] There is a very close connection between well logging and core data. Almost every analysis data of the core can establish a direct or indirect relationship with the well logging curve, such as core analysis density, porosity, saturation, permeability, capillary pressure, etc. These data can be obtained using the well logging curve, which is the basis for matching well logging and core analysis data, and is also an important data for testing and promoting the improvement of interpretation methods.

[0004] There are several main methods of underground coring, including drilling coring, pyrotechnics coring and drilling-type wellbore coring. Drilling coring is complicated in construction, takes a long time to coring, has a large span of coring layers and inaccurate positioning, and cannot achieve coring of various formations in the entire well section; the cores obtained by pyrotechnics coring are small in size and irregular in shape, which is not conducive to physical property analysis. Rotary wellbore coring makes up for the shortcomings of drilling coring and pyrotechnics coring. The core particles obtained are regular, and the lithology and oil content can be observed intuitively. Lithology, electrical properties, physical properties and oil content can also be directly analyzed and tested to obtain reservoir parameters such as saturation, porosity, permeability, etc., and the construction is simple and the cost is low. Therefore, the drilling-type wellbore coring technology has been welcomed by various oil companies and has a broad application prospect.

[0005] The drilling-type sidewall coring tool needs to complete the drilling and coring, core recovery, and ensure the integrity and storage of the core underground. Therefore, the coring sub is the key technology of the drilling-type sidewall coring tool, and the stability and reliability of the coring sub are the key to the success of well logging sidewall coring. However, the drilling-type sidewall coring tool in the prior art uses hydraulics to drive the drill bit running trajectory and cutting core feed, resulting in a complex hydraulic circuit with a large number of valve bodies, resulting in unstable cutting feed, easy damage, and low coring efficiency. Summary of the invention

[0006] In order to solve the problems existing in the prior art, the present invention provides a coring pup joint and method for a drilling-type wellbore coring instrument, which is used to solve the problems in the prior art of hydraulically pushing the drill bit running trajectory and cutting core feeding, resulting in a complex hydraulic circuit and the use of a large number of valve bodies, resulting in unstable cutting feed, easy damage, and low coring efficiency; the present invention hydraulically controls the movement trajectory of the drill bit, and controls the drill bit to rotate and cut rock by electricity. The unique mechanical structure ensures the stability and reliability of the drilling-type wellbore coring device.

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] A coring subsection of a drilling-type well wall coring instrument comprises an electronic circuit and a hydraulic control subsection, a motion power subsection, a motion subsection and a core storage subsection which are arranged in sequence; a coring drill bit is installed on the outer side of the motion subsection;

[0009] The motion power sub includes a coring structure matrix; a servo motor, a motion power mechanism, a hydraulic push mechanism and a drill bit tension piston are arranged inside the coring structure matrix; the servo motor provides the coring drill bit with power for rotating and cutting rocks;

[0010] The motion power mechanism is connected to the motion actuator in the motion short section through a motion connection hinge slider; the hydraulic pushing mechanism is used to push the core into the core storage short section;

[0011] The coring structure base is provided with a fixed plate, a breaking plate and a moving plate in sequence from the inside to the outside; a hydraulic drive slideway and a coring drill bit motion track slideway are provided on the fixed plate; the motion track of the drive shaft of the motion connection hinge slider coincides with the drive shaft slideway of the fixed plate, and the motion track of the drive shaft of the coring drill bit coincides with the motion track slideway of the coring drill bit;

[0012] The breaking plate is provided with a breaking trigger groove and a breaking tensioning groove; the breaking tensioning groove coincides with the tensioning block arranged at the front end of the drill tensioning piston, and the breaking trigger groove coincides with the hydraulic drive slideway at the end position in the X direction;

[0013] The moving plate is provided with a moving drive groove, a moving rotating shaft groove and a coring drill driving groove; the moving drive groove coincides with the position of the hydraulic driving slideway, the moving rotating shaft groove is installed on the fixed plate, the moving plate rotates around the moving rotating shaft groove, and the coring drill driving groove coincides with the coring drill motion track slideway and the coring drill driving shaft position.

[0014] Preferably, a pressure balancing mechanism is provided inside the coring structure matrix, and the pressure balancing mechanism provides hydraulic balance with the pressure in the well inside the motion power sub to provide pressure protection for the motion power sub and internal components.

[0015] Preferably, a displacement detection mechanism is provided inside the coring structure matrix, and the displacement detection mechanism is used to detect the movement process of the motion power short section.

[0016] Preferably, the servo motor is connected to the core drill bit gear via a reducer assembly to provide cutting power for the core drill bit to cut rocks.

[0017] Furthermore, the reducer assembly includes a small bevel gear, an input shaft at one end of the small bevel gear is connected to the output shaft of the servo motor to obtain motor power, the small bevel gear is meshed with the large bevel gear, and the large bevel gear is connected to the spur gear through a rotating shaft;

[0018] The spur gears mesh with the spur gears and the spur gears in sequence to perform two-stage speed change and power transmission; the spur gears are connected with the long-tooth gears through a rotating shaft; the long-tooth gears mesh with the thin gears on the core drill bit to transmit the power of rotating and cutting rocks to the drill bit, and the drill bit obtains power and starts to rotate.

[0019] Furthermore, the long-toothed gear is mounted on the coring structure base through a long-toothed gear fixing plate.

[0020] A coring method for a drilling-type wellbore coring instrument comprises the following steps:

[0021] The servo motor provides power for the coring drill bit to rotate and cut the rock, and the hydraulic system tightens the break plate through the drill bit tension piston and the break tension groove;

[0022] The hydraulic system pushes the motion connection hinge slider to move forward on the hydraulic drive slideway of the fixed plate;

[0023] The moving plate is pushed to rotate around the moving rotating shaft groove on the moving plate through the moving driving groove on the moving plate. The coring drill bit driving groove on the moving plate pushes the drill bit to slide along the coring drill bit motion track slideway in the X direction through the coring drill bit driving shaft. When the coring drill bit driving shaft slides on the coring drill bit motion track slideway from the X direction to the point where the coring drill bit motion track slideway turns to the Y direction, the direction of the coring drill bit turns to the Y direction, and the power of rotating and cutting the rock is transmitted to the coring drill bit, and the coring drill bit obtains the power and starts to rotate;

[0024] The hydraulic system pushes the moving hinge slider to move forward on the hydraulic drive slideway of the fixed plate, pushing the moving plate to rotate around the moving rotating shaft slot on the moving plate through the moving drive slot on the moving plate. The coring drill bit driving slot on the moving plate pushes the coring drill bit to move in the Y direction through the coring drill bit driving shaft, providing the coring drill bit with a coring pressure vertical to the well wall. When the coring drill bit driving shaft slides to the Y-direction end of the coring drill bit motion track slideway, the coring of the rock well wall is completed;

[0025] The hydraulic system releases the breaking plate through the drill tension piston and the breaking tension groove, and the hydraulic system pushes the moving hinge slider to move in the Z direction on the hydraulic drive slideway of the fixed plate, and pushes the moving plate to rotate around the moving rotating shaft groove on the moving plate through the moving drive groove on the moving plate. The coring drill driving groove on the moving plate pushes the coring drill to move in the Z direction through the coring drill driving shaft, and pushes the coring drill driving shaft to slide on the coring drill motion track slideway to the Z direction groove, and the coring drill tilts to complete the core folding action;

[0026] The hydraulic system provides reverse power to push the motion connection hinge slider to move in the opposite direction of X, thereby driving the motion plate and the broken plate to return to the initial state, and the core drill bit is driven to be retracted and flipped to the initial direction through the core drill bit drive shaft;

[0027] The hydraulic system drives the hydraulic pushing mechanism to push the core obtained from the coring drill bit into the core storage sub, completing the entire coring action.

[0028] Furthermore, when the direction of the core drill bit is turned to the Y direction, the long-toothed gear meshes with the thin gear on the core drill bit, transmitting the power of rotating and cutting the rock to the core drill bit.

[0029] Compared with the prior art, the present invention has the following beneficial technical effects:

[0030] The present invention provides a coring subsection of a drilling well coring instrument, which uses hydraulic pressure to push the running trajectory of a drill bit, and a motor to realize the cutting feed of the drill bit, thereby ensuring the reliability of the running trajectory of the drill bit and the cutting feed of the drill bit. Compared with drilling coring and gunpowder impact coring, the advantages of the drilling well coring device can be seen in the background technology. The coring subsections currently used in the drilling well coring device all use hydraulic pressure to push the running trajectory of the drill bit and the cutting core feed, resulting in a complex hydraulic circuit and the use of a large number of valve bodies, resulting in unstable cutting feed, easy damage, and low coring efficiency. The present invention decomposes the two movements into a hydraulically driven drill bit running trajectory and a motor controlled drill bit feed, thereby greatly increasing the stability and reliability of coring. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is the appearance diagram of the drilling-type well wall coring instrument in the present invention.

[0032] Figure 2 It is a motion power short section of the drilling-type well wall coring instrument in the present invention.

[0033] Figure 3 It is a structural diagram of the reducer assembly in the motion short section of the drilling-type wellbore coring instrument in the present invention.

[0034] Figure 4 It is a structural diagram of the motion mechanism of the drilling-type well wall coring instrument in the present invention.

[0035] In the accompanying drawings: electronic circuit and hydraulic control short section 11; motion power short section 12; motion short section 13; core storage short section 14; coring drill bit 15; coring well wall 16; coring structure matrix 21; servo motor 22; pressure balance mechanism 23; displacement detection mechanism 24; motion power mechanism 25; motion connection hinge slider 26; hydraulic pushing mechanism 27; drill bit tightening piston 28; reducer assembly 29; small bevel gear 31; large bevel gear 32; spur gear 33; spur gear 34; spur gear 35; long-tooth gear 36; long-tooth gear fixing plate 37; fixing plate 41; hydraulic drive slideway 411; coring drill bit motion track slideway 412; breaking plate 42; breaking trigger groove 421; breaking tightening groove 422; motion plate 43; motion drive groove 431; motion rotation axis groove 432; coring drill bit drive groove 433; coring drill bit drive shaft 44; thin gear 45. DETAILED DESCRIPTION

[0036] The present invention is further described in detail below in conjunction with specific embodiments, which are intended to explain the present invention rather than to limit it.

[0037] The coring subsection of a drilling-type well wall coring instrument of the present invention comprises an electronic circuit and hydraulic control subsection 11, a motion power subsection 12, a motion subsection 13 and a core storage subsection 14 which are arranged in sequence; a coring drill bit 15 is installed outside the motion subsection 13.

[0038] The motion power sub 12 includes a coring structure base 21; a servo motor 22, a motion power mechanism 25, a hydraulic pushing mechanism 27 and a drill bit tensioning piston 28 are arranged inside the coring structure base 21; the servo motor 22 provides the coring drill bit 15 with a rotational rock cutting power;

[0039] The motion power mechanism 25 is connected to the motion actuator in the motion short section 13 through the motion connection hinge slider 26; the hydraulic pushing mechanism 27 is used to push the core into the core storage short section 14;

[0040] A fixed plate 41, a breaking plate 42 and a moving plate 43 are sequentially installed on the coring structure base 21 from the inside to the outside; a hydraulic drive slideway 411 and a coring drill motion track slideway 412 are arranged on the fixed plate 41; the motion track of the drive shaft of the motion connection hinge slider 26 coincides with the drive shaft slideway 411 of the fixed plate 41, and the motion track of the coring drill drive shaft 44 coincides with the coring drill motion track slideway 412;

[0041] The breaking plate 42 is provided with a breaking trigger groove 421 and a breaking tensioning groove 422; the breaking tensioning groove 422 coincides with the tensioning block provided at the front end of the drill tensioning piston 28, and the breaking trigger groove 421 coincides with the hydraulic driving slideway 411 at the end position in the X direction;

[0042] A motion driving groove 431, a motion rotating shaft groove 432 and a coring drill driving groove 433 are provided on the moving plate 43; the motion driving groove 431 coincides with the hydraulic driving slide 411, the motion rotating shaft groove 432 is installed on the fixed plate 41, the moving plate 43 rotates around the motion rotating shaft groove 432, and the coring drill driving groove 433 coincides with the coring drill motion track slide 412 and the coring drill driving shaft 44.

[0043] A pressure balancing mechanism 23 is provided inside the coring structure matrix 21. The pressure balancing mechanism 23 provides hydraulic balance between the pressure in the well and the motion power sub 12 to provide pressure protection for the motion power sub 12 and the internal components.

[0044] A displacement detection mechanism 24 is provided inside the coring structure base 21, and the displacement detection mechanism 24 is used to detect the movement process of the motion power sub 12. The servo motor 22 is connected to the coring drill gear through the reducer assembly 29, and provides cutting power for the coring drill 15 to cut rocks.

[0045] The reducer assembly 29 includes a small bevel gear 31, the input shaft at one end of which is connected to the output shaft of the servo motor 22 to obtain motor power, the small bevel gear 31 meshes with the large bevel gear 32, and the large bevel gear 32 is connected to the spur gear 33 through a rotating shaft; the spur gear 33 meshes with the spur gear 34 and the spur gear 35 in sequence to perform two-stage speed change and power transmission; the spur gear 35 is connected to the long-tooth gear 36 through a rotating shaft; the long-tooth gear 36 meshes with the thin gear 45 on the coring drill bit 15 to transmit the power of rotating and cutting rocks to the drill bit, and the drill bit obtains power and starts to rotate. The long-tooth gear 36 is installed on the coring structure base 21 through the long-tooth gear fixing plate 37.

[0046] The coring structure base 21 is the foundation and carrier of the entire coring mechanism, on which the servo motor 22, the coring hydraulic circuit, the reducer, the motion mechanism, the displacement detection mechanism 24, and the core pushing mechanism are installed.

[0047] The servo motor 22 and the reducer assembly 29 provide the drill bit with power for rotating and cutting rocks. The speed of the servo motor 22 is adjustable, and different speeds can be adopted for different rock formations according to the feedback signal. The servo motor 22 can rotate in both clockwise and counterclockwise directions. When the coring is stuck or blocked, the reverse rotation provides a way to escape. The reducer assembly 29 adjusts the motor speed output, and adjusts the rotation direction through the bevel gear. The output speed gear at the end adopts a long-tooth gear structure to mesh with the drill gear to transmit the power for cutting rocks. The drill gear slides in the direction perpendicular to the well wall on the outer contour of the long-tooth gear, and the hydraulic system provides the moving power to complete the drilling and coring.

[0048] The coring hydraulic circuit inside the coring structure matrix 21 provides power to the coring motion mechanism through the hydraulic power of the entire hydraulic circuit, including the drill bit motion trajectory and drilling pressure, core pushing and displacement detection.

[0049] The motion power mechanism 25 is powered by a hydraulic system to complete the entire motion trajectory of the drill bit flipping, drilling pressure coring, core folding, and drill bit resetting. The motion process is detected by a displacement sensor. To complete its function, the operating mechanism is decomposed into a fixed plate, a moving plate, and a breaking plate as the running trajectory actuator; the motion power mechanism is decomposed into a motion power piston, a tensioning piston, a motion guide rail, and a motion connection hinge slider; the motion piston is provided with a displacement sensor as a motion state detection device.

[0050] The core pushing mechanism inside the coring structure matrix 21 is powered by a hydraulic system and the action sequence is provided by a hydraulic valve body. When coring is completed, the drill bit is reset, and the hydraulic pushing mechanism is started to push the core into the lower core storage sub.

[0051] The core drill bit 15 is an actuator for cutting rocks. Its internal hollowness determines the size of the cored rock. The size of the external contour line ensures that the contour line in the drill bit's running trajectory does not exceed the outer diameter of the instrument. The drill bit floats independently as a whole, moves within the action trajectory constrained by the motion mechanism, meshes with the long-toothed gear of the reducer, and slides on the outer contour of the gear.

[0052] The present invention uses a unique power mode to hydraulically drive the running trajectory of the drill bit, and the motor realizes the cutting feed of the drill bit, thereby ensuring the reliability of the running trajectory of the drill bit and the cutting feed of the drill bit. Compared with drilling coring and gunpowder impact coring, the advantages of the drilling-type wellbore coring device can be seen in the background technology. The coring pup joints currently used in the drilling-type wellbore coring device all use hydraulics to drive the running trajectory of the drill bit and feed the cutting core, resulting in a complex hydraulic circuit and the use of a large number of valve bodies, resulting in unstable cutting feed, easy damage, and low coring efficiency. The present invention decomposes the two movements into hydraulically driven drill bit running trajectory and motor controlled drill bit feed, which greatly increases the stability and reliability of coring.

[0053] Example

[0054] like Figure 1 As shown, a coring subsection of a drilling-type wellbore coring instrument of the present invention comprises an electronic circuit and hydraulic control subsection 11, a motion power subsection 12, a motion subsection 13 and a core storage subsection 14 arranged in sequence; a coring drill bit 15 is installed on the outer side of the motion subsection 13; the coring drill bit 15 and the wellbore 16 show the working state of the drilling-type wellbore coring device in the well.

[0055] The electronic circuit and hydraulic control subsection 11 is the electronic control part and hydraulic control part of the drilling well corer, which are responsible for the working control, ground communication and power transmission of the drilling well corer; the motion power subsection 12 provides power for the motion subsection and core pushing, and is also the installation carrier of the motion mechanism in the motion subsection, wherein the hydraulic circuit provides power for the motion mechanism to complete the motion trajectory function of the coring drill bit, and the motor and reducer provide the drill bit with power for rotating and cutting rocks; the motion subsection 13 is a subsection for realizing the coring function, in which the entire coring action of the drill bit in the oil well is completed, including flipping, pressing down to cut rocks, breaking cores, core recovery and core pushing; the core storage subsection 14 is pushed to the core storage subsection by the core pushing mechanism after the well coring is completed, and the structure of the core storage subsection is an important factor in determining the number of coring.

[0056] like Figure 2 As shown, the internal structure diagram of the coring structure matrix installation in the motion power subsection, the coring structure matrix 21 is the main body of the motion power subsection 12, and the power and detection mechanism of the motion subsection 13 is installed inside it, and it is also the installation carrier of the motion mechanism in the motion subsection 13; the servo motor 22 provides the drill bit with power for rotating and cutting rocks. The speed of the servo motor is adjustable, and different speeds can be adopted for different rock formations according to the feedback signal. The servo motor can rotate clockwise and counterclockwise. When the coring is clamped or blocked, the reverse rotation provides a way to escape; the pressure balance mechanism 23 provides the motion power subsection 12 with hydraulic balance with the pressure in the well inside the motion power subsection 12, and performs pressure protection on the motion power subsection 12 and the internal components; the displacement detection mechanism 24 is provided with a displacement sensor, and the motion process is detected by the displacement sensor; the motion power mechanism 25 provides power for the entire motion trajectory of the drill bit in the motion subsection 13, and the motion power mechanism 25 passes The motion connecting hinge slider 26 is connected to the motion actuator in the motion short section 13, and the linear motion will be decomposed in the motion short section 13 to complete the actions of flipping the drill bit, pressing down to cut the rock, breaking the core, and recovering the core; the hydraulic pushing mechanism 27 is for the completion of coring, the drill bit is reset, the hydraulic pushing mechanism is started, and the core is pushed into the lower end core storage short section; the drill bit tensioning piston 28 is a mechanism for tightening and positioning the coring drill bit during the coring process to assist in completing the core breaking action; one end of the reducer assembly 29 is connected to the servo motor 22 and the other end is connected to the coring drill bit gear to provide cutting power for coring and cutting rocks.

[0057] like Figure 3 As shown in FIG. 1 , the structure diagram of the reducer assembly in the motion short section of the drilling-type wellbore coring instrument, the reducer parts are installed on the coring structure base 21, as shown in FIG. Figure 2As shown in the position of the middle reducer assembly 29, the reducer assembly 29 is connected to the output shaft of the servo motor 22 through the input shaft at one end of the small bevel gear 31 to obtain motor power. The small bevel gear 31 is meshed with the large bevel gear 32 to achieve speed change and vertical change of the rotation axis. The large bevel gear 32 is connected to the spur gear 33 through the rotating shaft and speed transmission. The spur gear 33, the spur gear 34, and the spur gear 35 are meshed in sequence to achieve two-stage speed change and power transmission. The spur gear 35 is connected to the long-tooth gear 36 through the rotating shaft to achieve speed transmission. The reducer assembly 29 changes the direction of the rotational power to the vertical well wall cutting direction of the drill bit through the bevel gear group. The final power and speed obtained by the long-tooth gear 36 through the gear group power and speed transmission are transmitted to the coring drill bit to provide the coring drill bit with power for cutting rock.

[0058] like Figure 4 As shown, it is a structural diagram of the movement mechanism of the drilling-type well wall coring instrument, in which a hydraulic drive slide 411 and a coring drill bit movement track slide 412 are arranged on the fixed plate 41. The fixed plate 41 is installed on the coring structure base 21 and its position is such that the motion trajectory of the driving shaft of the moving hinge slider 26 coincides with the driving shaft slideway 411 of the fixed plate 41, and the motion trajectory of the coring drill bit driving shaft 44 coincides with the coring drill bit motion trajectory slideway 412; the breaking plate 42 is installed on the fixed plate 41 and the breaking tensioning groove 422 coincides with the tensioning block set at the front end of the drill bit tensioning piston 28, and the breaking trigger groove 421 coincides with the driving shaft slideway 411X end position; the moving plate 43 is installed on the outside of the breaking plate 42, the motion driving groove 431 coincides with the hydraulic driving slideway 411, the motion rotating shaft groove 432 is installed on the fixed plate 41, the moving plate 43 can rotate around the motion rotating shaft groove 432, and the coring drill bit driving groove 433 coincides with the coring drill bit motion trajectory slideway 412 and the coring drill bit driving shaft 44.

[0059] The working process of the coring sub of the drilling-type wellbore coring instrument is decomposed according to the sequence of actions:

[0060] (1) The core drill bit 15 obtains the power to rotate and cut the rock: the servo motor 22 provides the power, and the speed and direction of the power are changed through the reducer assembly 29. The hydraulic system tightens the break plate 42 through the drill bit tension piston 28 and the break tension groove 422.

[0061] (2) The hydraulic system pushes the hinge slider 26 to move forward on the hydraulic drive slide 411 of the fixed plate 41.

[0062] The moving plate 43 is pushed to rotate around the moving rotating shaft groove 432 on the moving plate 43 through the moving driving groove 431 on the moving plate 43. The coring drill bit driving groove 433 on the moving plate 43 pushes the drill bit to slide along the coring drill bit motion trajectory slideway 412 in the X direction through the coring drill bit driving shaft 44. When the coring drill bit driving shaft 44 slides on the coring drill bit motion trajectory slideway 412 from the X direction to the point where the coring drill bit motion trajectory slideway 412 turns to the Y direction, the direction of the coring drill bit 15 turns to the Y direction, and the long-tooth gear 36 engages with the coring drill bit 15 to transmit the power of rotating and cutting the rock to the drill bit, and the drill bit obtains power and starts to rotate.

[0063] (3) The hydraulic system pushes the movable hinge slider 26 to move forward on the hydraulic drive slide 411 of the fixed plate 41, pushing the movable plate 43 to rotate around the movable rotating shaft groove 432 on the movable plate 43 through the movable drive groove 431 on the movable plate 43. The coring drill bit drive groove 433 on the movable plate 43 pushes the drill bit to move in the Y direction through the coring drill bit drive shaft 44, providing the coring drill bit 15 with a coring pressure vertical to the well wall. When the coring drill bit drive shaft 44 slides to the Y-direction end of the coring drill bit motion trajectory slide 412, the cutting of the rock well wall and coring are completed.

[0064] (4) The hydraulic system releases the breaking plate 42 through the drill tensioning piston 28 and the breaking tensioning groove 422. The hydraulic system pushes the moving hinge slider 26 to move in the Z direction on the hydraulic driving slide 411 of the fixed plate 41, and pushes the moving plate 43 to rotate around the moving rotating shaft groove 432 on the moving plate 43 through the moving driving groove 431 on the moving plate 43. The coring drill driving groove 433 on the moving plate 43 pushes the drill to move in the Z direction through the coring drill driving shaft 44, and pushes the coring drill driving shaft 44 to slide to the Z direction groove on the coring drill motion trajectory slide 412, and the coring drill 15 tilts to complete the core breaking action.

[0065] (5) The hydraulic system provides reverse power to push the moving hinge slider 26 to move in the opposite direction of X, thereby driving the moving plate 43 and the breaking plate 42 to return to their initial state, and driving the coring drill bit 15 to be retracted and flipped to the initial direction through the coring drill bit drive shaft 44.

[0066] (6) The hydraulic system drives the hydraulic pushing mechanism 27 to push the core obtained from the coring drill bit 15 into the core storage sub 14, completing the entire coring operation.

Claims

1. A coring sub for a drilling-type wellbore coring instrument, characterized in that: It comprises an electronic circuit and a hydraulic control short section (11), a motion power short section (12), a motion short section (13) and a core storage short section (14) which are arranged in sequence; a core drill bit (15) is installed on the outer side of the motion short section (13); The motion power sub (12) comprises a coring structure base (21); a servo motor (22), a motion power mechanism (25), a hydraulic pushing mechanism (27) and a drill bit tensioning piston (28) are arranged inside the coring structure base (21); the servo motor (22) provides the coring drill bit (15) with power for rotating and cutting rocks; The motion power mechanism (25) is connected to the motion actuator in the motion short section (13) via a motion connection hinge slider (26); the hydraulic pushing mechanism (27) is used to push the core into the core storage short section (14); The coring structure base (21) is provided with a fixed plate (41), a breaking plate (42) and a moving plate (43) in sequence from the inside to the outside; a hydraulic drive slideway (411) and a coring drill motion track slideway (412) are provided on the fixed plate (41); the motion track of the drive shaft of the moving connection hinge slider (26) coincides with the drive shaft slideway (411) of the fixed plate (41), and the motion track of the coring drill drive shaft (44) coincides with the coring drill motion track slideway (412); The breaking plate (42) is provided with a breaking trigger groove (421) and a breaking tensioning groove (422); the breaking tensioning groove (422) coincides with a tensioning block arranged at the front end of the drill tensioning piston (28), and the breaking trigger groove (421) coincides with the hydraulic driving slideway (411) at the end position in the X direction; The moving plate (43) is provided with a moving driving groove (431), a moving rotating shaft groove (432) and a coring drill driving groove (433); the moving driving groove (431) coincides with the hydraulic driving slideway (411), the moving rotating shaft groove (432) is mounted on the fixed plate (41), the moving plate (43) rotates around the moving rotating shaft groove (432), and the coring drill driving groove (433) coincides with the coring drill motion track slideway (412) and the coring drill driving shaft (44).

2. A coring sub for a drilling-type wellbore coring instrument according to claim 1, characterized in that: A pressure balancing mechanism (23) is arranged inside the coring structure matrix (21). The pressure balancing mechanism (23) provides hydraulic balance between the pressure in the well and the motion power sub (12) inside the motion power sub (12), thereby providing pressure protection for the motion power sub (12) and internal components.

3. A coring sub for a drilling-type wellbore coring instrument according to claim 1, characterized in that: A displacement detection mechanism (24) is arranged inside the coring structure matrix (21), and the displacement detection mechanism (24) is used to detect the movement process of the moving power short section (12).

4. The coring sub for a drilling-type wellbore coring instrument according to claim 1, characterized in that: The servo motor (22) is connected to the core drill gear via a speed reducer assembly (29) to provide cutting power for the core drill (15) to cut rocks.

5. A coring sub for a drilling-type wellbore coring instrument according to claim 4, characterized in that: The reducer assembly (29) comprises a small bevel gear (31), an input shaft at one end of the small bevel gear (31) is connected to an output shaft of a servo motor (22) to obtain motor power, the small bevel gear (31) is meshed with a large bevel gear (32), and the large bevel gear (32) is connected to a spur gear (33) via a rotating shaft; The spur gear (33) meshes with the spur gear (34) and the spur gear (35) in sequence to perform two-stage speed change and power transmission; the spur gear (35) is connected with the long-tooth gear (36) via a rotating shaft; the long-tooth gear (36) meshes with the thin gear (45) on the core drill bit (15) to transmit the power of rotating and cutting rocks to the drill bit, and the drill bit obtains power and starts to rotate.

6. A coring sub for a drilling-type wellbore coring instrument according to claim 5, characterized in that: The long-toothed gear (36) is mounted on the coring structure base (21) via a long-toothed gear fixing plate (37).

7. A coring method for a drilling-type wellbore coring instrument, characterized in that: Including the following process, The servo motor (22) provides power for the core drill bit (15) to rotate and cut the rock, and the hydraulic system tightens the fracture plate (42) through the drill bit tension piston (28) and the fracture tension groove (422); The hydraulic system pushes the movable hinge slider (26) to move forward on the hydraulic drive slideway (411) of the fixed plate (41); The moving plate (43) is pushed to rotate around the moving rotating shaft groove (432) on the moving plate (43) through the moving driving groove (431) on the moving plate (43); the coring drill bit driving groove (433) on the moving plate (43) pushes the drill bit to slide along the coring drill bit motion track slideway (412) in the X direction through the coring drill bit driving shaft (44); when the coring drill bit driving shaft (44) slides on the coring drill bit motion track slideway (412) from the X direction to the point where the coring drill bit motion track slideway (412) turns to the Y direction, the direction of the coring drill bit (15) turns to the Y direction, and the power of rotating and cutting the rock is transmitted to the coring drill bit (15); the coring drill bit (15) obtains the power and starts to rotate; The hydraulic system pushes the moving hinge slider (26) to move forward on the hydraulic drive slideway (411) of the fixed plate (41), pushing the moving plate (43) to rotate around the moving rotating shaft groove (432) on the moving plate (43) through the moving drive groove (431) on the moving plate (43); the coring drill bit drive groove (433) on the moving plate (43) pushes the coring drill bit (15) to move in the Y direction through the coring drill bit drive shaft (44), providing the coring drill bit (15) with a coring pressure perpendicular to the well wall; when the coring drill bit drive shaft (44) slides to the Y-direction end of the coring drill bit motion track slideway (412), the cutting of the rock well wall and coring are completed; The hydraulic system releases the breaking plate (42) through the drill tension piston (28) and the breaking tension groove (422), and the hydraulic system pushes the moving hinge slider (26) to move in the Z direction on the hydraulic drive slideway (411) of the fixed plate (41), and pushes the moving plate (43) to rotate around the moving rotation axis groove (432) on the moving plate (43) through the moving drive groove (431) on the moving plate (43), and the coring drill drive groove (433) on the moving plate (43) pushes the coring drill (15) to move in the Z direction through the coring drill drive shaft (44), and pushes the coring drill drive shaft (44) to slide on the coring drill motion track slideway (412) to the Z direction groove, and the coring drill (15) tilts to complete the core breaking action; The hydraulic system provides reverse power to push the moving connection hinge slider (26) to move in the reverse direction of X, thereby driving the moving plate (43) and the breaking plate (42) to return to the initial state, and driving the core drill bit (15) to be retracted and turned to the initial direction through the core drill bit drive shaft (44); The hydraulic system drives the hydraulic pushing mechanism (27) to push the core obtained in the coring drill bit (15) into the core storage short section (14), thus completing the entire coring action.

8. A coring method for a drilling-type wellbore coring instrument according to claim 7, characterized in that: When the core drill bit (15) is turned to the Y direction, the long-toothed gear (36) meshes with the thin gear (45) on the core drill bit (15), and the power of rotating and cutting the rock is transmitted to the core drill bit (15).

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