A coring sub and method for a drilling well wall coring instrument

Abstract

The application discloses a coring sub of a drilling type sidewall coring instrument and a method, which comprises sequentially arranged electronic circuit and hydraulic control sub, motion power sub, motion sub and coring sub; the outer side of the motion sub is provided with a coring bit; the running track of the bit is driven by hydraulic pressure, and the cutting feed of the bit is realized by a motor, so that the reliability of the running track of the bit and the cutting feed of the bit is ensured. The application is used for solving the problems in the prior art, such as the hydraulic driving of the running track of the bit and the cutting feed of the core, the complexity of the hydraulic circuit, the application of a large number of valve bodies, the instability of the cutting feed, the easy damage, and the low coring efficiency; the application adopts the structural mode of the electric control of the running track of the bit and the rotation of the bit for cutting rock, and the unique mechanical structure ensures the stability and reliability of the drilling type sidewall coring instrument.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of oil logging, and particularly relates to a coring sub and a method of a drilling type borehole wall coring instrument. BACKGROUND

[0002] With the development of logging technology, oilfield exploration and reservoir development are increasingly complex, and the use of core analysis to determine the permeability and formation pressure gradient of the reservoir has become an important work. Geological exploration increasingly needs to obtain more data on reservoir fluid saturation, reservoir pressure, oil layer relative humidity and reservoir properties under the actual conditions of the formation at the bottom of the well, and the market urgently needs large-diameter borehole coring technology to meet the needs of oilfield services and solve the problems of complex reservoir exploration and development.

[0003] Logging and core data have a very close relationship. Almost every analysis data about the core can establish a direct or indirect relationship with the logging curve, such as core analysis density, porosity, saturation, permeability, capillary pressure, etc. These data can be obtained by using the logging curve, which is the basis for matching logging and core analysis data and is also important information for testing and improving the interpretation method.

[0004] Downhole coring mainly has three ways: drilling coring, explosive impact coring and drilling type borehole wall coring. Drilling coring is complex, takes a long time, has a large span of coring layer and is not accurate in positioning, and cannot achieve coring of all types of formations in the whole well section; the explosive impact coring obtains small and irregularly shaped cores, which is not conducive to physical analysis. The rotary borehole wall coring makes up for the shortcomings of drilling coring and explosive impact coring, and the obtained core particles are regular, can be directly observed for lithology and oiliness, and can be directly analyzed for lithology, electrical property, physical property and oiliness to obtain saturation, porosity, permeability and other reservoir parameters. The rotary borehole wall coring has simple construction and low cost. Therefore, the drilling type borehole wall coring technology is welcomed by various oil companies and has a broad application prospect.

[0005] The drilling type borehole wall coring instrument needs to complete drilling coring and core recovery in the downhole to ensure the integrity and storage of the core. Therefore, the coring sub is a key technology of the drilling type borehole wall coring instrument, and the stability and reliability of the coring sub are the key to the success of the logging borehole coring. However, the drilling type borehole wall coring instrument in the prior art uses hydraulic pressure to drive the drill bit to run and cut the core, which causes the hydraulic circuit to be complex and a large number of valve bodies to be used, resulting in unstable cutting feeding, easy damage and low coring efficiency. SUMMARY

[0006] In order to solve the problems in the prior art, the present application provides a coring sub of a drilling type sidewall coring instrument and a method, which are used to solve the problems of the hydraulic pushing drill bit running track and the cutting rock core feeding in the prior art, which causes the hydraulic circuit to be complex, a large number of valve bodies to be applied, the cutting feeding to be unstable, the cutting feeding to be damaged easily, and the coring efficiency to be low; the present application controls the movement track of the drill bit by hydraulic pressure, and the structure mode of the electric power control drill bit rotating to cut rock, and the unique mechanical structure ensures the stability and reliability of the drilling type sidewall coring instrument.

[0007] In order to achieve the above object, the present application provides the following technical scheme.

[0008] A coring sub of a drilling type sidewall coring instrument, comprising electronic circuit and hydraulic control sub, movement power sub, movement sub and core storage sub which are sequentially arranged; a coring drill bit is mounted on the outer side of the movement sub;

[0009] The movement power sub comprises a coring structure base body; a servo motor, a movement power mechanism, a hydraulic pushing mechanism and a drill bit tensioning piston are arranged in the coring structure base body; the servo motor provides the rotating cutting rock power for the coring drill bit;

[0010] The movement power mechanism is connected with a movement execution mechanism in the movement sub through a movement connecting hinge slider; the hydraulic pushing mechanism is used to push the rock core into the core storage sub;

[0011] The coring structure base body is sequentially provided with a fixed plate, a broken plate and a movement plate from inside to outside; a hydraulic drive slide and a coring drill bit movement track slide are arranged on the fixed plate; a movement connecting hinge slider drive shaft movement track is coincident with the fixed plate drive shaft slide, and a coring drill bit drive shaft movement track is coincident with the coring drill bit movement track slide;

[0012] The broken plate is provided with a broken trigger groove and a broken tensioning groove; the broken tensioning groove is coincident with a tensioning block arranged at the front end of the drill bit tensioning piston, and the broken trigger groove is coincident with the hydraulic drive slide at the X-direction end position;

[0013] The movement plate is provided with a movement drive groove, a movement rotating shaft groove and a coring drill bit drive groove; the movement drive groove is coincident with the hydraulic drive slide, the movement rotating shaft groove is mounted on the fixed plate, the movement plate rotates around the movement rotating shaft groove, and the coring drill bit drive groove is coincident with the coring drill bit movement track slide and the coring drill bit drive shaft.

[0014] Preferably, a pressure balance mechanism is arranged in the coring structure base body, which provides the hydraulic balance with the well pressure for the movement power sub in the movement power sub, and pressure protection is performed on the movement power sub and the internal elements.

[0015] Preferably, the coring structure base is internally provided with a displacement detection mechanism for detecting the movement of the movement power sub.

[0016] Preferably, the servo motor is connected with the coring bit gear through a speed reducer assembly to provide cutting power for the coring bit to cut rock.

[0017] Further, the speed reducer assembly comprises a bevel pinion, one end of the input shaft of the bevel pinion is connected with the output shaft of the servo motor to obtain motor power, the bevel pinion is engaged with a bevel gear, and the bevel gear is connected with a spur gear through a rotating shaft.

[0018] The spur gear is engaged with a long-tooth gear and a long-tooth gear in turn to perform two-stage speed reduction and power transmission; the long-tooth gear is connected with the long-tooth gear through a rotating shaft; and the long-tooth gear is engaged with a thin gear on the coring bit to transmit the rotary cutting rock power to the coring bit, so that the coring bit obtains power to start rotating.

[0019] Further, the long-tooth gear is installed on the coring structure base through a long-tooth gear fixing plate.

[0020] A coring method of a drilling type sidewall coring instrument, comprising the following processes,

[0021] The servo motor provides power for the coring bit to cut rock, and the hydraulic system pulls the breaking plate through the breaking tension slot and the bit tension piston.

[0022] The hydraulic system pushes the movement connection hinge slider to move forward on the hydraulic drive slide of the fixed plate.

[0023] The movement plate is rotated around the movement rotating shaft slot on the movement plate through the movement drive slot on the movement plate, the coring bit drive slot on the movement plate pushes the coring bit to slide on the coring bit movement track slide in the X direction, when the coring bit drive shaft slides on the coring bit movement track slide from the X direction to the Y direction, the direction of the coring bit is turned to the Y direction, the rotary cutting rock power is transmitted to the coring bit, and the coring bit obtains power to start rotating.

[0024] The hydraulic system pushes the movement connection hinge slider to move forward on the hydraulic drive slide of the fixed plate, the movement plate is rotated around the movement rotating shaft slot on the movement plate through the movement drive slot on the movement plate, the coring bit drive slot on the movement plate pushes the coring bit to move in the Y direction, the coring bit is provided with coring pressure perpendicular to the sidewall, when the coring bit drive shaft slides to the Y direction end of the coring bit movement track slide, the coring of the rock sidewall is completed.

[0025] The hydraulic system releases the broken plate by the tensioning piston and the broken tensioning groove of the drill bit, the hydraulic system drives the movement connection hinge slider to move in the Z direction on the hydraulic drive slide of the fixed plate, the movement plate rotates around the movement rotation shaft groove on the movement plate through the movement drive groove on the movement plate, the coring drill bit drive groove on the movement plate drives the coring drill bit to move in the Z direction, the coring drill bit drive shaft slides to the Z direction groove on the coring drill bit movement track slide, and the coring drill bit completes the coring action by tilting;

[0026] The hydraulic system provides reverse power, drives the movement connection hinge slider to move in the X direction, drives the movement plate and the broken plate to return to the initial state, drives the coring drill bit to retract and turn to the initial direction through the coring drill bit drive shaft.

[0027] The hydraulic system drives the hydraulic pushing mechanism to push the rock core obtained in the coring drill bit into the coring short section, and the whole coring action is completed.

[0028] Further, when the direction of the coring drill bit is turned to the Y direction, the long-tooth gear meshes with the thin gear on the coring drill bit, and the power of rotating and cutting rock is transmitted to the coring drill bit.

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

[0030] The present application provides a coring short section of a drilling type sidewall coring instrument, the running track of the drill bit is driven by the hydraulic system, the cutting feed of the drill bit is realized by the motor, the reliability of the running track of the drill bit and the cutting feed of the drill bit is ensured, compared with drilling coring and explosive impact coring, the advantages of the drilling type sidewall coring instrument are shown in the background art, at present, the coring short section of the drilling type sidewall coring instrument is driven by the hydraulic system to drive the running track of the drill bit and the cutting feed of the drill bit, the hydraulic circuit is complex, a large number of valve bodies are used, the cutting feed is unstable, is easy to be damaged, and the coring efficiency is not high, the present application divides two movements into the hydraulic drive of the running track of the drill bit and the motor control of the feed of the drill bit, and greatly increases the stability and reliability of coring. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 It is the appearance diagram of the drilling type sidewall coring instrument in the present application.

[0032] Figure 2 It is the movement power short section of the drilling type sidewall coring instrument in the present application.

[0033] Figure 3 It is the structure diagram of the speed reducer assembly in the movement short section of the drilling type sidewall coring instrument in the present application.

[0034] Figure 4 It is the structure diagram of the movement mechanism of the drilling type sidewall coring instrument in the present application.

[0035] In the drawing: electronic circuit and hydraulic control short section 11; motion power short section 12; motion short section 13; core storage short section 14; coring bit 15; coring wall 16; coring structure base 21; servo motor 22; pressure balancing mechanism 23; displacement detection mechanism 24; motion power mechanism 25; motion connecting hinge slider 26; hydraulic pushing mechanism 27; bit tensioning piston 28; speed reducer assembly 29; small bevel gear 31; large bevel gear 32; straight gear 33; straight gear 34; straight gear 35; long tooth gear 36; long tooth gear fixing plate 37; fixing plate 41; hydraulic drive slide 411; coring bit motion trajectory slide 412; breaking plate 42; breaking trigger groove 421; breaking tensioning groove 422; motion plate 43; motion drive groove 431; motion rotating shaft groove 432; coring bit drive groove 433; coring bit drive shaft 44; thin gear 45. DETAILED DESCRIPTION

[0036] The application will be further described in conjunction with specific examples, which are an explanation rather than a limitation of the application.

[0037] The coring short section of the drilling type wall coring instrument of the application comprises the electronic circuit and hydraulic control short section 11, the motion power short section 12, the motion short section 13 and the core storage short section 14 arranged in sequence; the outer side of the motion short section 13 is provided with the coring bit 15.

[0038] The motion power short section 12 comprises the coring structure base 21; the coring structure base 21 is internally provided with the servo motor 22, the motion power mechanism 25, the hydraulic pushing mechanism 27 and the bit tensioning piston 28; the servo motor 22 provides the rotating cutting rock power for the coring bit 15;

[0039] The motion power mechanism 25 is connected with the motion execution mechanism in the motion short section 13 through the motion connecting hinge slider 26; the hydraulic pushing mechanism 27 is used for pushing the rock core into the core storage short section 14;

[0040] The fixing plate 41, the breaking plate 42 and the motion plate 43 are sequentially arranged on the coring structure base 21 from inside to outside; the hydraulic drive slide 411 and the coring bit motion trajectory slide 412 are arranged on the fixing plate 41; the motion connecting hinge slider 26 drive shaft motion trajectory coincides with the fixing plate 41 drive shaft slide 411, and the coring bit drive shaft 44 motion trajectory coincides with the coring bit motion trajectory slide 412;

[0041] The breaking trigger groove 421 and the breaking tensioning groove 422 are arranged on the breaking plate 42; the breaking tensioning groove 422 coincides with the tensioning block arranged at the front end of the bit tensioning piston 28, and the breaking trigger groove 421 coincides with the hydraulic drive slide 411 at the X-direction end position;

[0042] The motion driving groove 431 is coincident with the hydraulic driving slide 411 in position, the motion rotating shaft groove 432 is installed on the fixed plate 41, the motion plate 43 rotates around the motion rotating shaft groove 432, and the coring bit driving groove 433 is coincident with the coring bit motion track slide 412 and the coring bit driving shaft 44 in position.

[0043] The pressure balance mechanism 23 is arranged in the coring structure base 21, and provides hydraulic balance for the motion power short section 12 in the motion power short section 12, so as to protect the motion power short section 12 and internal elements from pressure.

[0044] The displacement detection mechanism 24 is arranged in the coring structure base 21, and is used for detecting the motion process of the motion power short section 12. The servo motor 22 is connected with the coring bit gear through the speed reducer assembly 29, so as to provide cutting power for the coring bit 15 to cut rock.

[0045] The speed reducer assembly 29 comprises a bevel pinion 31, an input shaft at one end of the bevel pinion 31 is connected with an output shaft of the servo motor 22 to obtain motor power, the bevel pinion 31 is meshed with a bevel gear 32, the bevel gear 32 is connected with a spur gear 33 through a rotating shaft; the spur gear 33 is sequentially meshed with a spur gear 34 and a spur gear 35 to perform two-stage speed reduction and power transmission; the spur gear 35 is connected with a long-tooth gear 36 through a rotating shaft; the long-tooth gear 36 is meshed with a thin gear 45 on the coring bit 15 to transmit the rotating power for cutting rock to the coring bit, so that the coring bit obtains power to start rotating. The long-tooth gear 36 is installed on the coring structure base 21 through a long-tooth gear fixing plate 37.

[0046] The coring structure base 21 is a basis and carrier of the whole coring mechanism, and the servo motor 22, a coring hydraulic circuit, a speed reducer, a motion mechanism, the displacement detection mechanism 24 and a core pushing mechanism are installed thereon.

[0047] The servo motor 22 and the speed reducer assembly 29 provide the rotating power for cutting rock for the coring bit. The servo motor 22 is adjustable in rotating speed, and can adopt different rotating speeds according to feedback signals for different rock layers. The servo motor 22 can rotate clockwise and counterclockwise, and provides a way of getting rid of trouble when the coring is blocked. The speed reducer assembly 29 adjusts the rotating speed output of the motor, adjusts the rotating direction through bevel gears, and adopts a long-tooth gear structure for the rotating speed gear at the end to mesh with the coring bit gear to transmit the power for cutting rock. The coring bit gear slides in the vertical well wall direction outside the long-tooth gear, and the movement power is provided by the hydraulic system to complete the coring.

[0048] The coring fluid pressure circuit inside the coring structure base 21 is powered by the hydraulic power through the whole hydraulic circuit to provide power for the coring movement mechanism.

[0049] The movement power mechanism 25 is powered by the hydraulic system to complete the whole movement trajectory of the bit turning, the bit drilling pressure coring, the core breaking, and the bit resetting, and the movement process is detected by the displacement sensor. To complete the function, the running mechanism is divided into a fixed plate, a movement plate, and a breaking plate as a running trajectory execution mechanism; the movement power mechanism is divided into a movement power piston, a tension piston, a movement guide rail, and a movement connection hinge slider; the movement piston is provided with a displacement sensor as a movement state detection device.

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

[0051] The coring bit 15 is an execution mechanism for cutting rock, is hollow inside, and its size determines the size of the coring rock. The outer contour size ensures that the contour line in the bit running trajectory does not exceed the outer diameter size of the instrument. The bit as a whole floats independently and moves in the movement mechanism constrained action trajectory, is engaged with the long-tooth gear of the speed reducer, and slides outside the gear contour.

[0052] The present application uses a unique power mode to push the bit running trajectory by hydraulic pressure, realizes the cutting feeding of the bit by the motor, ensures the reliability of the bit running trajectory and the cutting feeding of the bit, and has the advantages of the drilling coring, the explosive impact coring, and the drilling type well wall coring device. The coring short section of the drilling type well wall coring device currently applied is pushed by hydraulic pressure to run the trajectory and cut the rock feeding, which causes the hydraulic circuit to be complex, a large number of valve bodies to be applied, the cutting feeding to be unstable, the cutting feeding to be damaged easily, and the coring efficiency to be low. The present application divides the two movements into the hydraulic driving bit running trajectory and the motor controlled bit feeding, greatly increases the stability and reliability of the coring.

[0053] Embodiment

[0054] As shown in Figure 1 Fig. 1, a coring short section of a drilling type well wall coring instrument of the present application comprises an electronic circuit and hydraulic control short section 11, a movement power short section 12, a movement short section 13, and a core storage short section 14 arranged in sequence; the outer side of the movement short section 13 is provided with a coring bit 15; the coring bit 15 and the well wall 16 show the working state of the drilling type well wall coring device in the well.

[0055] The electronic circuit and hydraulic control short section 11 is an electronic control part and a hydraulic control part of the drilling type sidewall coring device, and is responsible for the working control of the drilling type sidewall coring device, ground communication and power transmission. The motion power short section 12 provides power for the motion short section and core pushing, and is also a mounting carrier of the motion mechanism in the motion short section. The hydraulic circuit provides power for the motion mechanism to complete the motion trajectory function of the coring bit. The motor and the speed reducer provide the rotation cutting rock power for the bit. The motion short section 13 is a coring function implementation short section, in which the whole coring action in the oil well is completed, including the turning of the bit, the cutting of rock, the breaking of the core, the recovery of the core and the pushing of the core. The core storage short section 14 is used for pushing the core to the core storage short section by the core pushing mechanism after the sidewall coring is completed. The structure of the core storage short section is an important factor to determine the number of cores.

[0056] As shown in Figure 2 , the motion power short section is a motion power short section, and the internal installation structure diagram of the coring structure base body is shown in FIG. 6. The coring structure base body 21 is the main body of the motion power short section 12, and the power and detection mechanism of the motion short section 13 is installed inside. It is also a mounting carrier of the motion mechanism in the motion short section 13. The servo motor 22 provides the rotation cutting rock power for the bit. The servo motor speed is adjustable, and different speeds can be adopted according to the feedback signals of different rock layers. The servo motor can rotate clockwise and counterclockwise. When the coring is stuck or blocked, the reverse rotation provides a way to get out of trouble. The pressure balance mechanism 23 provides hydraulic balance with the pressure in the well for the motion power short section 12, and provides pressure protection for the motion power short section 12 and the internal elements. The displacement detection mechanism 24 sets the displacement sensor, and the motion process is detected by the displacement sensor. The motion power mechanism 25 provides power for the whole motion trajectory of the bit in the motion short section 13. The motion power mechanism 25 is connected with the motion execution mechanism in the motion short section 13 through the motion connection hinge slider 26. The linear motion will be decomposed in the motion short section 13 to complete the turning of the bit, the cutting of rock, the breaking of the core and the recovery of the core. The hydraulic pushing mechanism 27 is used for pushing the core into the lower end core storage short section after the coring is completed and the bit is reset. The bit tension piston 28 is used for tensioning and positioning the coring bit during the core breaking process, and is an auxiliary mechanism for completing the core breaking action. The speed reducer assembly 29 is connected with the servo motor 22 at one end and connected with the coring bit gear at the other end, and provides the cutting power for the coring and rock cutting.

[0057] As shown in Figure 3 , the structure diagram of the speed reducer assembly in the motion short section of the drilling type sidewall coring instrument is shown in FIG. 7. The speed reducer parts are installed on the coring structure base body 21. As shown in Figure 2As shown in the diagram, the reducer assembly 29 is connected to the output shaft of the servo motor 22 via the input shaft of the small bevel gear 31 to obtain motor power. The small bevel gear 31 meshes 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 via the rotation shaft for speed transmission. The spur gears 33, 34, and 35 mesh sequentially to achieve two-stage speed change and power transmission. The spur gear 35 is connected to the long tooth gear 36 via the rotation shaft for speed transmission. The reducer assembly 29 changes the direction of rotational power to the direction of the drill bit perpendicular to the well wall cutting direction through the bevel gear set. The final power and speed obtained by the long tooth gear 36 through the gear set is transmitted to the core drill bit to provide the power for cutting the rock.

[0058] like Figure 4 The diagram shows the structure of the motion mechanism of the drilling-type wellbore coring instrument. The fixed plate 41 is equipped with a hydraulic drive slide 411 and a coring drill bit motion trajectory slide 412. The fixed plate 41 is installed on the core structure base 21, and its position coincides with the motion trajectory of the drive shaft of the motion connection hinge slider 26 and the drive shaft slide 411 of the fixed plate 41. The motion trajectory of the core drill bit drive shaft 44 coincides with the core drill bit motion trajectory slide 412. The break plate 42 is installed on the fixed plate 41, and the break tension groove 422 coincides with the tension block set at the front end of the drill bit tension piston 28. The break trigger groove 421 coincides with the X-axis end position of the drive shaft slide 411. The motion plate 43 is installed on the outside of the break plate 42. The motion drive groove 431 coincides with the position of the hydraulic drive slide 411. The motion rotation shaft groove 432 is installed on the fixed plate 41. The motion plate 43 can rotate around the motion rotation shaft groove 432. The core drill bit drive groove 433 coincides with the position of the core drill bit motion trajectory slide 412 and the core drill bit drive shaft 44.

[0059] The working process of the coring section of a drilling-type wellbore coring instrument is broken down in sequence as follows:

[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 broken plate 42 through the drill bit tension piston 28 and the broken tension groove 422.

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

[0062] The pushing movement plate 43 rotates around the movement rotation shaft groove 432 on the movement plate 43 through the movement driving groove 431 on the movement plate 43, and the coring bit driving groove 433 on the movement plate 43 pushes the drill bit to slide on the coring bit movement trajectory slide 412 in the X direction through the coring bit driving shaft 44. When the coring bit driving shaft 44 slides on the coring bit movement trajectory slide 412 from the X direction to the Y direction, the direction of the coring bit 15 is turned to the Y direction, the long-tooth gear 36 is engaged with the coring bit 15, the power of rotating and cutting rock is transmitted to the drill bit, and the drill bit obtains power to start rotating.

[0063] (3) The hydraulic system pushes the movement connecting hinge slider 26 to move forward on the hydraulic driving slide 411 of the fixed plate 41, the pushing movement plate 43 rotates around the movement rotation shaft groove 432 on the movement plate 43 through the movement driving groove 431 on the movement plate 43, and the coring bit driving groove 433 on the movement plate 43 pushes the drill bit to move in the Y direction through the coring bit driving shaft 44, providing the coring pressure of the coring bit 15 to the well wall. When the coring bit driving shaft 44 slides to the Y direction end of the coring bit movement trajectory slide 412, the coring of the rock well wall is completed.

[0064] (4) The hydraulic system releases the breaking plate 42 through the drill bit tensioning piston 28 and the breaking tension groove 422, the hydraulic system pushes the movement connecting hinge slider 26 to move in the Z direction on the hydraulic driving slide 411 of the fixed plate 41, the pushing movement plate 43 rotates around the movement rotation shaft groove 432 on the movement plate 43 through the movement driving groove 431 on the movement plate 43, and the coring bit driving groove 433 on the movement plate 43 pushes the drill bit to move in the Z direction through the coring bit driving shaft 44, pushing the coring bit driving shaft 44 to slide on the coring bit movement trajectory slide 412 to the Z direction groove, and the coring bit 15 completes the coring action of tilting.

[0065] (5) The hydraulic system provides reverse power, pushes the movement connecting hinge slider 26 to move in the X direction, and then drives the movement plate 43 and the breaking plate 42 to return to the initial state, and drives the coring bit 15 to retract and turn to the initial direction through the coring bit driving shaft 44.

[0066] (6) The hydraulic system pushes the coring core obtained in the coring bit 15 into the coring short section 14 through the hydraulic pushing mechanism 27, and completes the entire coring action.

Claims

1. A coring section for a drilling-type wellbore coring instrument, characterized in that, It includes 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 core drill bit (15) is installed on the outside of the motion subsection (13); The motion power section (12) includes a core structure base (21); the core structure base (21) is equipped with a servo motor (22), a motion power mechanism (25), a hydraulic pushing mechanism (27) and a drill bit tensioning piston (28); the servo motor (22) provides the rotational cutting power for the core drill bit (15); The motion power mechanism (25) is connected to the motion execution mechanism in the motion section (13) via the motion connection hinge slider (26); the hydraulic pushing mechanism (27) is used to push the core into the core storage section (14). The core structure base (21) is provided with a fixed plate (41), a broken plate (42) and a moving plate (43) installed from the inside to the outside; the fixed plate (41) is provided with a hydraulic drive slide (411) and a core drill bit movement trajectory slide (412); the movement trajectory of the drive shaft of the motion connecting hinge slider (26) coincides with the hydraulic drive slide (411) of the fixed plate (41), and the movement trajectory of the drive shaft (44) of the core drill bit coincides with the core drill bit movement trajectory slide (412); The break plate (42) is provided with a break trigger groove (421) and a break tension groove (422); the break tension groove (422) coincides with the tension block provided at the front end of the drill bit tension piston (28), and the break trigger groove (421) coincides with the hydraulic drive slide (411) at the end position in the X direction; The motion plate (43) is provided with a motion drive groove (431), a motion rotation shaft groove (432), and a core drill bit drive groove (433); the motion drive groove (431) coincides with the position of the hydraulic drive slide (411), the motion rotation shaft groove (432) is installed on the fixed plate (41), the motion plate (43) rotates around the motion rotation shaft groove (432), and the core drill bit drive groove (433) coincides with the position of the core drill bit motion trajectory slide (412) and the core drill bit drive shaft (44).

2. The coring section of a drilling-type wellbore coring instrument according to claim 1, characterized in that, The core structure matrix (21) is equipped with a pressure balancing mechanism (23), which provides hydraulic balance between the moving power sub (12) and the well pressure inside the moving power sub (12) to protect the moving power sub (12) and its internal components.

3. The coring section of a drilling-type wellbore coring instrument according to claim 1, characterized in that, The core structure substrate (21) is equipped with a displacement detection mechanism (24), which is used to detect the motion process of the dynamic short section (12).

4. The coring section of a drilling-type wellbore coring instrument according to claim 1, characterized in that, The servo motor (22) is connected to the core drill bit gear through the reducer assembly (29) to provide cutting power for the core drill bit (15) to cut the rock.

5. The coring section of a drilling-type wellbore coring instrument according to claim 4, characterized in that, The reducer assembly (29) includes a small bevel gear (31), the input shaft of one end of the small bevel gear (31) 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 first spur gear (33) meshes with the second spur gear (34) and the third spur gear (35) in sequence to perform two-stage speed change and power transmission; the third spur gear (35) is connected to the long toothed gear (36) through a rotating shaft; the long toothed gear (36) meshes with the thin gear (45) on the core drill bit (15) to transmit the power of rotating and cutting the rock to the drill bit, and the drill bit obtains power and begins to rotate.

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

7. A coring method for a drilling-type wellbore coring instrument, based on the coring sub of a drilling-type wellbore coring instrument as described in claim 1, characterized in that, Includes the following processes, The servo motor (22) provides power for the core drill bit (15) to rotate and cut the rock. The hydraulic system tightens the broken plate (42) through the drill bit tension piston (28) and the broken tension groove (422). The hydraulic system pushes the motion-connecting hinge slider (26) to move forward on the hydraulic drive slide (411) of the fixed plate (41); The motion plate (43) rotates around the motion rotation shaft groove (432) on the motion plate (43) via the motion drive groove (431) on the motion plate (43). The core drill bit drive groove (433) on the motion plate (43) pushes the drill bit to slide along the core drill bit motion trajectory slide (412) in the X direction via the core drill bit drive shaft (44). When the core drill bit drive shaft (44) slides from the X direction to the point where the core drill bit motion trajectory slide (412) turns to the Y direction, the direction of the core drill bit (15) turns to the Y direction, and the power of rotating and cutting the rock is transmitted to the core drill bit (15). The core drill bit (15) obtains power and begins to rotate. The hydraulic system pushes the motion connection hinge slider (26) to move forward on the hydraulic drive slide (411) of the fixed plate (41). The motion plate (43) rotates around the motion rotation shaft groove (432) on the motion plate (43) through the motion drive groove (431) on the motion plate (43). The core drill bit drive groove (433) on the motion plate (43) pushes the core drill bit (15) to move in the Y direction through the core drill bit drive shaft (44), providing the core drill bit (15) with the core pressure perpendicular to the well wall. When the core drill bit drive shaft (44) slides to the Y end of the core drill bit motion trajectory slide (412), the core cutting of the rock well wall is completed. The hydraulic system releases the broken plate (42) by tightening the piston (28) and breaking the tension groove (422) through the drill bit. The hydraulic system pushes the sliding block (26) of the motion connection hinge to move in the Z direction on the hydraulic drive slide (411) of the fixed plate (41). The moving plate (43) rotates around the moving rotation shaft groove (432) on the moving plate (43) through the motion drive groove (431) on the moving plate (43). The core drill bit drive groove (433) on the moving plate (43) pushes the core drill bit (15) to move in the Z direction through the core drill bit drive shaft (44). The core drill bit drive shaft (44) is pushed to slide on the core drill bit motion trajectory slide (412) to the Z direction groove. The core drill bit (15) tilts to complete the core breaking action. The hydraulic system provides reverse power to push the sliding block (26) of the motion connection hinge to move in the opposite direction of X, thereby driving the motion plate (43) and the broken plate (42) to return to the initial state. The core drill bit (15) is driven to retract and flip back to the initial direction through the core drill bit drive shaft (44). The hydraulic system drives the hydraulic push mechanism (27) to push the core obtained from the core drill bit (15) into the core storage section (14), completing the entire core taking action.

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

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