Rotary sidewall coring tool

Abstract

A rotary sidewall coring tool, comprising an electronic sub (1), a balance sub (2), a hydraulic control sub (3), a mechanical execution sub (4) and a rock core storage sub (5), wherein the mechanical execution sub (4) comprises a mechanical sub housing (41), a transmission device is provided in the mechanical sub housing (41), the transmission device is connected to a drill bit assembly, a side opening allowing the drill bit assembly to extend out is provided in the mechanical sub housing, the transmission device is configured to be driven by the driving device to cause the drill bit assembly to drill a stratum, break a rock core, retract and over-turn, and an axis of the drill bit assembly after overturning is parallel to that of the coring tool; a heat absorption unit (14) is further provided, such that the reliability of an electronic circuit is improved; and a reverse pushing arm (33) is additionally arranged, such that the coring tool is separated from a sidewall.

Description

Rotary wellbore coring tool

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to a Chinese patent application filed with the Patent Office of China on April 1, 2024, with application number 202410388461.4 and title “Rotary Well Coring Instrument,” the entire contents of which are incorporated herein by reference. Technical Field

[0003] The present invention belongs to the technical field of oil and natural gas exploration and development, and particularly relates to a rotary wellbore coring tool. Background Art

[0004] As China's requirements for detailed evaluation of complex geological structures, such as deep formations, deepwater, high-temperature, high-pressure, and highly deviated wells, continue to increase, coring operations are becoming increasingly difficult, placing increasing demands on instrument reliability and stability. Existing coring instruments cannot fully meet the requirements for high-temperature, high-reliability, and highly deviated well coring operations, and also suffer from high maintenance costs.

[0005] Summary of the Invention

[0006] In order to solve all or part of the above problems, the purpose of the present disclosure is to provide a rotary wellbore coring instrument. The transmission device of the rotary wellbore coring instrument disclosed herein can drive the drill bit assembly to drill into the formation, break the core, retract and flip under the drive of the driving device, and has the advantage of high reliability.

[0007] According to one aspect of the present disclosure, a rotary wellbore coring instrument is provided, comprising an electronic pup section, a balancing pup section, a hydraulically controlled pup section, a mechanical execution pup section and a core storage pup section, wherein the mechanical execution pup section comprises a mechanical section housing, a transmission device is provided in the mechanical section housing, the transmission device is connected to the drill bit assembly, and the transmission device is used to drive the drill bit assembly to drill into the formation, break the core, retract and flip under the drive of the driving device, and after flipping, the axis of the drill bit assembly is parallel to the axis of the coring instrument, and a side opening is provided on the mechanical section housing for the drill bit assembly to extend out.

[0008] Furthermore, the transmission device includes two limit guide rails arranged in parallel, and the two limit guide rails are fixedly connected to the mechanical section housing. A first slide groove is provided on each limit guide rail, and a moving guide rail is connected to the side of each limit guide rail away from the other limit guide rail. A second slide groove is provided on each moving guide rail. The drill bit assembly is arranged between the two limit guide rails, and a first slider is fixedly connected to the corresponding two sides of the drill bit assembly. Each first slider passes through the corresponding first slide groove and extends into the second slide groove. The two moving guide rails are connected to a driving device, and the driving device is used to drive the two moving guide rails to move up and down, so as to drive the drill bit assembly to drill into the formation, break the core, retract and flip through the cooperation of the first slide groove and the second slide groove.

[0009] Furthermore, the upper ends of the two moving guide rails are connected to the upper fixed pull plate, and the lower ends of the two moving guide rails are connected to the lower fixed pull plate. The driving device is connected to the upper fixed pull plate to drive the upper fixed pull plate to move through the driving device to realize the up and down movement of the two moving guide rails.

[0010] Furthermore, each limiting guide rail is provided with a matching slide groove on one side away from the other limiting guide rail, each matching slide groove extends in the vertical direction to both ends and passes through the corresponding limiting guide rails, and each moving guide rail is fixedly connected to a matching guide rail that matches the matching slide groove.

[0011] Furthermore, the first slide groove includes a horizontal slide groove whose length direction is parallel to the drilling direction of the drill bit assembly, and the second slide groove includes a linear slide groove. There is an acute angle between the linear slide groove and the horizontal slide groove. The driving device is used to drive the two moving guide rails to move up and down, so as to drive the drill bit assembly to drill into the formation, break the core and retract through the cooperation of the horizontal slide groove and the linear slide groove.

[0012] Furthermore, the first slide groove also includes a first arc groove, the first arc groove is arranged at an end of the horizontal slide groove away from the side opening, the first arc groove is connected to the horizontal slide groove, the second slide groove also includes a second arc groove, the second arc groove is arranged at an end of the linear slide groove away from the side opening, the second arc groove is connected to the linear slide groove, and the two sides of the drill bit assembly are also fixedly connected to the second slider, and each limiting guide rail is also provided with a second slider matching groove connected to the horizontal slide groove, and the driving device is used to drive the two moving guide rails to move so that the second slide groove pushes the first slider through the first arc groove, so that the second slider moves in the second slider matching groove to realize the flipping of the drill bit assembly.

[0013] Furthermore, the first slider is a diamond slider, one set of mutually parallel surfaces of the diamond slider contacts the two side walls of the horizontal slide, and another set of mutually parallel surfaces of the diamond slider contacts the two side walls of the linear slide; the drill bit assembly includes a drill bit and a hydraulic motor connected to the drill bit, and the first slider and the second slider are both arranged on the hydraulic motor; the driving device includes a drilling hydraulic cylinder, and the piston rod of the drilling hydraulic cylinder is connected to the moving guide rail.

[0014] Furthermore, the hydraulic control pup joint includes a hydraulic joint body, on which an upper push arm and a reverse push arm are provided, wherein the pushing direction of the upper push arm is opposite to that of the reverse push arm, and a lower push arm is provided on the mechanical joint housing, wherein the pushing direction of the upper push arm is the same as that of the lower push arm, and the reverse push arm can be used alone to peel the coring tool from the well wall;

[0015] The upper push arm and the reverse push arm have the same structure; the reverse push arm includes a reverse push hydraulic cylinder composed of a reverse push cylinder body, a first piston rod and a second piston rod, wherein the reverse push cylinder body is sealed and slidably connected with the first piston rod, a through hole is opened in the first piston rod, the through hole is sealed and slidably connected with the second piston rod, and the end of the second piston rod extending out of the first piston rod is fixedly connected to the push head, and the reverse push hydraulic cylinder is connected to a hydraulic control unit, which is used to control the extension of the first piston rod and the second piston rod in the reverse push cylinder body, and to control the retraction of the first piston rod and the second piston rod in the reverse push cylinder body.

[0016] Furthermore, the electronic short section includes a thermal insulation outer shell, in which a number of electronic skeletons are arranged, each electronic skeleton is used to fix the circuit board, and heat absorption units are provided at both ends of each electronic skeleton, and the length of the heat absorption unit is determined by the heat generation of the circuit board on the electronic skeleton adjacent to it; an insulating sleeve is provided above the uppermost heat absorption unit in the thermal insulation outer shell, and an insulating filler is provided below the lowermost heat absorption unit in the thermal insulation outer shell; the upper end of the thermal insulation outer shell is connected to an upper joint, and the lower end of the thermal insulation outer shell is connected to an electronic plug connector, and the circuit board is connected to the electronic plug connector through the insulating filler and the heat absorption unit.

[0017] Furthermore, a balancing nipple is arranged between the electronic nipple and the hydraulic control nipple, and the balancing nipple includes a balancing nip outer shell, a balancing cylinder is arranged in the balancing nip outer shell, a moving piston is arranged in the balancing cylinder, the moving piston divides the space in the balancing cylinder into a mud chamber and an oil chamber, and a piston tension spring, a moving rod and a moving rod compression spring are arranged in the oil chamber, wherein one end of the piston tension spring is fixed to one end of the cylinder, the other end of the piston tension spring is connected to one side of the moving piston, one side of the moving piston is also connected to one end of the moving rod compression spring, the other end of the moving rod compression spring is connected to one end of the moving rod, and a displacement sensor for measuring the displacement of the moving piston is provided at the other end of the moving rod, a limiting structure is provided on the other end of the moving rod, and a locking structure is also connected to one side of the moving piston, and the moving piston drives the moving rod to move through the cooperation of the locking structure and the limiting structure.

[0018] Furthermore, the core storage sub includes several core barrels, which are threadedly connected to each other, and the core storage sub can be seated at the wellhead through a wellhead clamp; the top core barrel is connected to the connecting barrel above it through a transition joint, and the top core barrel is threadedly connected to the transition joint, and the upper end of the transition joint is fixedly connected with several clamping blocks, and the lower end of the connecting barrel is provided with a clamping groove that cooperates with the clamping block, and the transition joint and the connecting barrel are connected through the clamping block and the clamping groove, and a cotter pin is connected between the connecting barrel and the transition joint.

[0019] From the above technical solution, it can be seen that the rotary wellbore coring tool provided by the present disclosure has the following beneficial effects:

[0020] The transmission device of the rotary sidewall coring tool disclosed herein can, under the drive of the driving device, drive the drill bit assembly to drill into the formation, break the core, retract and flip. After flipping, the axis of the drill bit assembly is parallel to the axis of the coring tool, thereby reducing the diameter of the coring tool. At the same time, it has the advantage of high reliability.

[0021] The present invention adds a reverse push arm, which can be used alone to peel the coring tool from the well wall, thereby solving the problem that the coring tool is adhered to the well wall and cannot be peeled off from the well wall;

[0022] The electronic short section disclosed herein includes a heat-insulating outer shell, in which the electronic skeleton is disposed, thereby achieving overall heat exchange with the outside world through the heat-insulating outer shell. Furthermore, heat-absorbing units of different lengths are configured according to the different heat outputs of the circuit boards on the electronic skeleton, thereby making the temperature inside the thermos substantially uniform and improving the reliability of the electronic circuit.

[0023] The core storage sub disclosed in the present invention can be seated at the wellhead via a wellhead chuck, thereby enabling rapid replacement and assembly of core barrels at the wellhead.

[0024] Summary of the Figures

[0025] FIG1 is a schematic diagram of a rotary wellbore coring tool according to an embodiment of the present disclosure;

[0026] FIG2 is a cross-sectional view of an electronic sub according to an embodiment of the present disclosure;

[0027] FIG3 is a cross-sectional view of the reverse thrust arm portion of the hydraulic control sub according to an embodiment of the present disclosure;

[0028] FIG4 is a diagram showing the hydraulic control principle of the hydraulic control unit according to an embodiment of the present disclosure;

[0029] FIG5 is a cross-sectional view of a transmission device portion of a mechanical actuator subsection according to an embodiment of the present disclosure;

[0030] FIG6 is a cross-sectional view of a balancing sub according to an embodiment of the present disclosure;

[0031] The accompanying drawings are marked as follows: electronic short section 1, balancing short section 2, hydraulic control short section 3, mechanical execution short section 4, core storage short section 5, upper joint 11, thermal insulation outer shell 12, thermal insulation sleeve 13, heat absorption unit 14, electronic skeleton 15, thermal insulation filler 16, electronic plug connector 17, balancing joint outer shell 21, balancing cylinder 22, mud chamber 23, moving piston 24, piston tension spring 25, moving rod compression spring 26, moving rod 27, displacement sensor 28, hydraulic joint body 31, upper push arm 32, reverse thrust The leaning arm 33, the reverse leaning cylinder 331, the first piston rod 332, the second piston rod 333, the leaning head 334, the mechanical section housing 41, the lower leaning arm 42, the upper fixed pull plate 43, the drill bit 44, the hydraulic motor 45, the limiting guide rail 46, the first slide groove 461, the horizontal slide groove 4611, the first arc groove 4612, the second slider matching groove 462, the moving guide rail 47, the second slide groove 471, the second arc groove 4711, the linear slide groove 4712, the matching guide rail 472, and the lower fixed pull plate 48.

[0032] Preferred embodiments of the present disclosure

[0033] In order to better understand the purpose, structure and function of the present invention, a rotary wellbore coring tool of the present invention is further described in detail below with reference to the accompanying drawings.

[0034] As shown in Figures 1 and 5, a rotary wellbore coring instrument according to an embodiment of the present disclosure is shown, comprising an electronic sub 1, a balancing sub 2, a hydraulic control sub 3, a mechanical execution sub 4 and a core storage sub 5. The mechanical execution sub 4 comprises a mechanical section housing 41. A transmission device is provided in the mechanical section housing 41. The transmission device is connected to the drill bit assembly. The transmission device is used to drive the drill bit assembly to drill into the formation, break the core, retract and flip under the drive of the driving device. After flipping, the axis of the drill bit assembly is parallel to the axis of the coring instrument. A side opening is provided on the mechanical section housing 41 for the drill bit assembly to extend out.

[0035] Specifically, the electronic sub 1, the balancing sub 2, the hydraulic control sub 3, the mechanical execution sub 4 and the core storage sub 5 constitute the downhole system of the coring instrument of this embodiment. The coring instrument also includes a surface system, which consists of an acquisition computer, a control panel and a power supply. The surface system is used to control the downhole system of the coring instrument.

[0036] Among them, the electronic short section 1 mainly receives the instructions issued by the ground system, and controls the hydraulic control short section 3, the mechanical execution short section 4 and the core storage short section 5 according to the instructions of the ground system to complete the coring action.

[0037] The electronic sub 1 also sends various status information of the downhole system to the surface system, including formation GR signal (for depth calibration), cable head voltage, pump pressure signals of various pumps, drilling displacement signal, core length displacement signal, electronic sub temperature, hydraulic sub temperature, etc.

[0038] The balance sub 2 achieves pressure balance between the internal hydraulic oil and the external mud through the movement of the internal piston. At the same time, the balance sub 2 is equipped with an oil level detection sensor to detect changes in the volume of the internal hydraulic oil.

[0039] The hydraulic control sub 3 includes a hydraulic system for controlling the main and auxiliary push arm movements, a hydraulic system for controlling drilling in, drilling out, spacer insertion, and core pushing movements, and a hydraulic system for controlling the rotation of the hydraulic motor.

[0040] The mechanical actuator sub 4 realizes the instrument's functions of pushing, coring, folding, and recovering cores, and is mainly composed of the main pushing, drilling, core length measurement, core storage, and core pushing actuators.

[0041] To reiterate, the electronic sub 1 is used to communicate with the ground control system and to control the hydraulic control sub 3 and the mechanical actuator sub 4; the hydraulic control sub 3 is used to provide power to the mechanical actuator sub 4, which is used to perform operations such as pushing, coring, folding, and recovering cores; the core storage sub 5 is used to store the retrieved core samples.

[0042] Again, the mechanical execution short section 4 includes a mechanical section housing 41 and a transmission device arranged in the mechanical section housing 41, wherein the transmission device is used to drive the drill bit assembly to extend from the side opening and drill into the formation to complete the coring operation under the drive of the driving device in the hydraulic control short section 3. After the coring operation is completed, the drill bit assembly is driven by the driving device and the transmission device to break the core and retract it into the mechanical section housing 41. Finally, the drill bit assembly is driven by the driving device and the transmission device to flip so that the axis of the drill bit assembly is parallel to the axis of the coring tool, thereby reducing the diameter of the mechanical section housing 41 accordingly.

[0043] In one embodiment, as shown in Figure 5, the transmission device includes two limiting guide rails 46 arranged in parallel, and the two limiting guide rails 46 are fixedly connected to the mechanical section housing 41. A first slide groove 461 is provided on each limiting guide rail 46, and a moving guide rail 47 is connected to the side of each limiting guide rail 46 away from the other limiting guide rail 46. A second slide groove 471 is provided on each moving guide rail 47. The drill bit assembly is arranged between the two limiting guide rails 46, and a first slider is fixedly connected to the corresponding two sides of the drill bit assembly. Each first slider passes through the corresponding first slide groove 461 and extends into the second slide groove 471. The two moving guide rails 47 are connected to a driving device, which is used to drive the two moving guide rails 47 to move up and down, so as to drive the drill bit assembly to drill into the formation, break the core, retract and flip through the cooperation of the first slide groove 461 and the second slide groove 471.

[0044] Specifically, the transmission device includes two limiting guide rails 46 and two moving guide rails 47, wherein the two limiting guide rails 46 are arranged in parallel and are fixedly connected to the mechanical section housing 41, and each limiting guide rail 46 is connected to a moving guide rail 47 on one side away from the other limiting guide rail 46, and the two moving guide rails 47 are both connected to the driving device to drive the two moving guide rails 47 to move up and down relative to the limiting guide rail 46 through the driving device.

[0045] Again, each limiting guide rail 46 is provided with a first slide groove 461, and each moving guide rail 47 is provided with a second slide groove 471, and the two sides of the corresponding limiting guide rail 46 on the drill bit assembly are fixedly connected with a first slider, and the two first sliders respectively pass through the corresponding first slide groove 461 and extend into the second slide groove 471. Therefore, in the process of the two moving guide rails 47 moving up and down, the first slider is pushed by the second slide groove 471 to slide in the first slide groove 461 to realize the movement of the drill bit assembly to drill into the formation, break the core, retract and flip.

[0046] In one embodiment, as shown in Figure 5, the upper ends of the two moving guide rails 47 are connected to the upper fixed pull plate 43, and the lower ends of the two moving guide rails 47 are connected to the lower fixed pull plate 48. The driving device is connected to the upper fixed pull plate 43 to drive the upper fixed pull plate 43 to move through the driving device to realize the up and down movement of the two moving guide rails 47.

[0047] Specifically, this embodiment realizes the synchronous movement of the two moving guide rails 47 through the setting of the upper fixed pull plate 43, wherein the upper ends of the two moving guide rails 47 are connected to the upper fixed pull plate 43, and the driving device is connected to the upper fixed pull plate 43, so that the upper fixed pull plate 43 is driven up and down by the driving device to realize the synchronous up and down movement of the two moving guide rails 47.

[0048] The lower ends of the two moving guide rails 47 are connected to the lower fixed pull plate 48. The setting of the upper fixed pull plate 43 and the lower fixed pull plate 48 is also used to limit the movement of the drill assembly, that is, the drill assembly is limited between the upper fixed pull plate 43 and the lower fixed pull plate 48.

[0049] In one embodiment, as shown in Figure 5, each limiting guide rail 46 is provided with a mating slide groove on the side away from the other limiting guide rail 46, and each mating slide groove extends in the vertical direction to both ends and passes through the corresponding limiting guide rail 46, and each moving guide rail 47 is fixedly connected to a mating guide rail 472 that cooperates with the mating slide groove.

[0050] As can be seen from the foregoing, the motion guide rail 47 is capable of moving up and down relative to the limiting guide rail 46. Specifically, each limiting guide rail 46 is provided with a mating slot on the side away from the other limiting guide rail 46. Each mating slot extends to both the upper and lower ends and penetrates the corresponding limiting guide rail 46. A mating guide rail 472 is fixedly connected to the corresponding side of each motion guide rail 47. The mating guide rail 472 moves within the mating slot to achieve the up and down movement of the two motion guide rails 47. As an alternative, the mating guide rail 472 can be provided on the side of each limiting guide rail 46 away from the other limiting guide rail 46, and the mating slot can be provided on each motion guide rail 47. Similarly, the mating guide rail 472 moves within the mating slot to achieve the up and down movement of the two motion guide rails 47.

[0051] In one embodiment, as shown in Figure 5, the first slide groove 461 includes a horizontal slide groove 4611 whose length direction is parallel to the drilling direction of the drill bit assembly, and the second slide groove 471 includes a linear slide groove 4712. There is an acute angle between the linear slide groove 4712 and the horizontal slide groove 4611. The driving device is used to drive the two moving guide rails 47 to move up and down, so as to drive the drill bit assembly to drill into the formation, break the core and retract through the cooperation of the horizontal slide groove 4611 and the linear slide groove 4712.

[0052] Specifically, the first chute 461 includes a horizontal chute 4611, the length of which is parallel to the direction in which the drill bit 44 penetrates the formation. Thus, the second chute 471 propels the drill bit assembly within the horizontal chute 4611, thereby gradually approaching or moving the drill bit assembly away from the formation. To ensure that the drill bit assembly can smoothly extend from the side opening through the horizontal chute 4611, the side opening is located on an extension line of the horizontal chute 4611.

[0053] Again, the second chute 471 includes a linear chute 4712, which has an acute angle with the horizontal chute 4611, for example, the acute angle between the linear chute 4712 and the horizontal chute 4611 is 45 degrees, 30 degrees, etc., so that the linear chute 4712, driven by the driving device, moves up and down as a whole to push the drill bit assembly to move within the horizontal chute 4611, thereby achieving drilling or retraction of the drill bit assembly. After the drill bit assembly drills a core sample, the driving device drives the drill bit assembly downward to break the core. Specifically, the driving device drives the motion guide 47 downward, causing the side of the drill bit assembly in contact with the motion guide 47 to move downward, while the other side of the drill bit assembly tilts upward, thereby breaking the core.

[0054] In one embodiment, as shown in Figure 5, the first slide groove 461 also includes a first arcuate groove 4612, which is arranged at the end of the horizontal slide groove 4611 away from the side opening, and the first arcuate groove 4612 is connected to the horizontal slide groove 4611. The second slide groove 471 also includes a second arcuate groove 4711, which is arranged at the end of the linear slide groove 4712 away from the side opening, and the second arcuate groove 4711 is connected to the linear slide groove 4712. Second sliders are also fixedly connected to both sides of the drill bit assembly, and each limiting guide rail 46 is also provided with a second slider matching groove 462 connected to the horizontal slide groove 4611. The driving device is used to drive the two moving guide rails 47 to move so that the second slide groove 471 pushes the first slider through the first arcuate groove 4612, so that the second slider moves in the second slider matching groove 462 to realize the flipping of the drill bit assembly.

[0055] Specifically, taking the case where the side opening is on the left and the linear slide 4712 tilts from the upper left to the lower right as an example, when the driving device drives the motion guide rail 47 upward until the first slider enters the second arcuate groove 4711 from the linear slide 4712, the first slider correspondingly passes through the first arcuate groove 4612, and the second slider correspondingly enters the second slider matching groove 462. The driving device continues to drive the motion guide rail 47 upward, and the second arcuate groove 4711 pushes the first slider to move within the first arcuate groove 4612, and the corresponding second slider moves within the second slider matching groove 462 to achieve the flipping of the drill bit assembly, and finally the axis of the drill bit assembly rotates to be parallel to the axis of the coring tool. In the process of drilling into the formation, the line connecting the first slider and the second slider is parallel to the horizontal direction, so that the drill bit assembly can be flipped 90 degrees.

[0056] In one embodiment, the first slider is a diamond slider, one set of parallel surfaces of the diamond slider contacts the two side walls of the horizontal slide 4611, and another set of parallel surfaces of the diamond slider contacts the two side walls of the linear slide 4712; the drill bit assembly includes a drill bit 44 and a hydraulic motor 45 connected to the drill bit 44, and the first slider and the second slider are both arranged on the hydraulic motor 45; the driving device includes a drilling hydraulic cylinder, and the piston rod of the drilling hydraulic cylinder is connected to the moving guide rail 47.

[0057] In this embodiment, the first slider is specifically a diamond-shaped slider, and the drill bit assembly specifically includes a drill bit 44 and a hydraulic motor 45. The hydraulic motor 45 is used to drive the drill bit 44 to rotate; the driving device includes a drilling hydraulic cylinder (corresponding to G6 in Figure 4), and the piston rod of the drilling hydraulic cylinder is connected to the upper fixed pull plate 43. When the piston rod of the drilling hydraulic cylinder is extended, it correspondingly drives the upper fixed pull plate 43 and the moving guide rail 47 to move downward. When the piston rod of the drilling hydraulic cylinder is retracted, it correspondingly drives the upper fixed pull plate 43 and the moving guide rail 47 to move upward.

[0058] Furthermore, the mechanical section housing 41 of this embodiment also houses a spacer insertion mechanism and a core detection mechanism. After drilling, the core passes through the core channel and is pushed into the core barrel. The core detection mechanism performs real-time testing of the core within the core barrel. The tested core then passes through the core channel and is stored in the core barrel of the core storage sub 5. The spacer insertion mechanism pushes spacers into the core channel after the core is pushed. The spacers are used to physically distinguish cores from different layers.

[0059] In one embodiment, as shown in FIG3 , the hydraulic control pup joint 3 includes a hydraulic joint body 31 , on which an upper push arm 32 and a reverse push arm 33 are provided. The pushing direction of the upper push arm 32 is opposite to that of the reverse push arm 33 . A lower push arm 42 is provided on the mechanical joint housing 41 , and the pushing direction of the upper push arm 32 is the same as that of the lower push arm 42 . The reverse push arm 33 can be used alone to peel the coring instrument from the well wall.

[0060] Specifically, during the coring operation, the upper push arm 32 and the reverse push arm 33 can be opened at the same time to fix the coring instrument firmly on the well wall. At the same time, the force of the upper push to fix the coring instrument is also relatively large, which prevents the coring instrument from moving up and down during the coring process, causing the drill bit 44 to get stuck. Again, when the coring instrument is attached to the well wall, the reverse push arm 33 can be used alone to peel the instrument off the well wall, thereby solving the problem that the coring instrument is stuck to the well wall and cannot be peeled off from the well wall.

[0061] In one embodiment, the upper push arm 32 and the reverse push arm 33 have the same structure; the reverse push arm 33 includes a reverse push hydraulic cylinder composed of a reverse push cylinder body 331, a first piston rod 332 and a second piston rod 333, wherein the reverse push cylinder body 331 is sealed and slidably connected with the first piston rod 332, a through hole is opened in the first piston rod 332, and the through hole is sealed and slidably connected with the second piston rod 333, and the end of the second piston rod 333 extending outside the first piston rod 332 is fixedly connected with a push head 334, and the reverse push hydraulic cylinder is connected to a hydraulic control unit, which is used to control the extension of the first piston rod 332 and the second piston rod 333 in the reverse push cylinder body 331, and to control the retraction of the first piston rod 332 and the second piston rod 333 in the reverse push cylinder body 331.

[0062] Specifically, the upper push arm 32 and the reverse push arm 33 have the same structure, and only the installation position and direction are different. Taking the reverse push arm 33 as an example, the reverse push arm 33 includes a reverse push cylinder 331, a first piston rod 332, a second piston rod 333 and a push head 334. When hydraulic oil is introduced into the rodless cavity of the reverse push cylinder 331, the first piston rod 332 and the second piston rod 333 gradually extend out of the reverse push cylinder 331, thereby realizing the extension of the push head 334 for fixing the coring instrument firmly on the well wall or for peeling the instrument off the well wall; when hydraulic oil is introduced into the rod cavity of the reverse push cylinder 331 again, the first piston rod 332 and the second piston rod 333 gradually retract into the reverse push cylinder 331, thereby realizing the retraction of the reverse push arm 33.

[0063] Among them, the hydraulic control unit of the reverse thrust hydraulic cylinder G3 is shown in Figure 4, including the hydraulic control reversing valve NC-8, the hydraulic control reversing valve NO-9, the hydraulic control check valve R3, the hydraulic control check valve R4 and the safety relief valve K6; among them, the hydraulic control reversing valve NC-4 is a two-position, three-way normally-off hydraulic control reversing valve, and the hydraulic control reversing valve NO-9 is a two-position, three-way normally-open hydraulic control reversing valve. When the hydraulically controlled reversing valve NO-9 and the hydraulically controlled reversing valve NC-8 are in the normal position, the high-pressure oil enters the control outlet (C port) through the high-pressure oil inlet (P port) of the hydraulically controlled reversing valve NO-9, and the high-pressure oil at the control outlet enters the rod chamber of the reverse thrust cylinder 331; at the same time, the high-pressure oil passing through the hydraulically controlled reversing valve NO-9 opens the hydraulically controlled one-way valve R3, and the hydraulic oil in the rodless chamber of the reverse thrust cylinder 331 returns to the oil tank through the hydraulically controlled one-way valve R3, so that the first piston rod 332 and the second piston rod 333 in the reverse thrust cylinder 331 can be retracted; and for the electromagnetic reversing valve NC-8, a part of the hydraulic oil in the rodless chamber of the reverse thrust cylinder 331 enters the second oil port (R port) through the control outlet (C port) and flows back to the oil tank.

[0064] When the hydraulically controlled reversing valve NO-9 and the hydraulically controlled reversing valve NC-8 are reversed at the same time, the high-pressure oil enters the control outlet (C port) through the high-pressure oil inlet (P port) of the hydraulically controlled reversing valve NC-8, and the hydraulic oil in the control outlet (C port) enters the rodless chamber of the reverse thrust cylinder 331; at the same time, the high-pressure oil passing through the hydraulically controlled reversing valve NC-8 opens the hydraulically controlled check valve R4, and the hydraulic oil in the rod chamber of the reverse thrust cylinder 331 returns to the oil tank through the hydraulically controlled check valve R4; in addition, the high-pressure oil inlet (P port) of the hydraulically controlled reversing valve NO-9 is cut off and closed, and a part of the hydraulic oil in the rod chamber of the reverse thrust cylinder 331 enters the second oil port (R port) through the control outlet (C port) and flows back to the oil tank. In this way, the first piston rod 332 and the second piston rod 333 can be pushed out.

[0065] The safety relief valve K6 plays an overpressure protection role. Specifically, when the reverse thrust hydraulic cylinder does not move for a long time, the hydraulic oil enclosed in the hydraulic pipeline will expand due to heat, causing the pressure to increase. When the pressure of the pressure oil rises to exceed the opening value of the safety relief valve K6, the safety relief valve K6 opens, and the hydraulic oil flows back to the oil tank through the safety relief valve K6 to achieve unloading.

[0066] Finally, in Figure 4, G1 represents the downward push hydraulic cylinder, G2 represents the upward push hydraulic cylinder, G4 represents the spacer hydraulic cylinder, G5 represents the coring hydraulic cylinder, and G6 represents the drilling hydraulic cylinder. The principles underlying these cylinders are identical to those of the reverse push hydraulic cylinder G3 and will not be further elaborated here. The hydraulic control unit of this embodiment utilizes a hydraulically controlled reversing valve structure, thereby reducing the number of electromagnetic reversing valves required and improving the reliability of the coring tool.

[0067] In one embodiment, as shown in Figure 2, the electronic short section 1 includes a thermal insulation outer shell 12, in which a plurality of electronic skeletons 15 are arranged, each electronic skeleton 15 is used to fix a circuit board, and heat absorption units 14 are provided at both ends of each electronic skeleton 15. The length of the heat absorption unit 14 is determined by the heat generation of the circuit board on the electronic skeleton 15 adjacent thereto; a thermal insulation sleeve 13 is provided above the uppermost heat absorption unit 14 in the thermal insulation outer shell 12, and a thermal insulation filler 16 is provided below the lowermost heat absorption unit 14 in the thermal insulation outer shell 12; the upper end of the thermal insulation outer shell 12 is connected to the upper joint 11, and the lower end of the thermal insulation outer shell 12 is connected to the electronic plug connector 17, and the circuit board passes through the thermal insulation filler 16 and the heat absorption unit 14 to be connected to the electronic plug connector 17.

[0068] Specifically, the electronic sub 1 of this embodiment includes an insulating outer shell 12, which is thermally insulated and heat-insulating and can withstand an ambient pressure of 140 MPa. The upper end of the insulating outer shell 12 is connected to an upper connector 11, and the lower end of the insulating outer shell 12 is connected to an electronic plug connector 17. The cavity formed by the insulating outer shell 12, the upper connector 11, and the electronic plug connector 17 is evacuated to accommodate the electronic skeleton 15. The upper connector 11 is used to connect the electronic sub 1 to the structure at the upper end, for example, to connect the electronic sub 1 to a bridle or to a temperature and tension sub via the upper connector 11.

[0069] Again, the electronic skeletons 15 include several of them, each used to secure a circuit board. Heat absorbing units 14 are provided at both ends of each electronic skeleton 15, and the length of each heat absorbing unit 14 is determined by the heat generated by the circuit board on the adjacent electronic skeleton 15. The heat absorbing unit 14 includes a metal heat absorber shell containing a heat absorber for storing heat. The interior of the thermal insulation outer shell 12 of this embodiment employs a cross-sectional layout of the heat absorbing units 14 and the electronic skeletons 15, which facilitates uniform heating. Heat absorbing units 14 of varying lengths are configured according to the varying heat generated by the circuit boards, thereby ensuring a substantially uniform temperature within the thermal insulation outer shell 12.

[0070] Again, the thermal insulation filler 16 is made of a material with relatively high thermal resistance, such as silk cotton, to isolate the internal heat of the thermal insulation outer shell 12 from the external heat. The thermal insulation sleeve 13 also serves to isolate the internal heat of the thermal insulation outer shell 12 from the external heat. The electronic skeleton 15 is made of a material with relatively low thermal resistance, so that the heat transfer and heat dissipation of the electronic skeleton 15 are relatively fast and uniform. The electronic short section 1 of this embodiment can ensure that the internal temperature of the thermos bottle does not exceed 150°C during continuous operation in an environment of 205°C, greatly improving the reliability of the circuit board.

[0071] In one embodiment, as shown in Figure 1, a balancing sub 2 is disposed between the electronic sub 1 and the hydraulic control sub 3. Balancing sub 2 is used to balance the hydraulic oil pressure within the instrument with the mud pressure in the downhole formation. While balancing sub 2 in this embodiment is disposed between the electronic sub 1 and the hydraulic control sub 3, it may also be disposed in other locations during specific implementations.

[0072] Again, as shown in Figure 6, the balancing short section 2 includes a balancing joint outer shell 21, a balancing cylinder 22 is provided in the balancing cylinder 22, and a moving piston 24 is provided in the balancing cylinder 22. The moving piston 24 divides the space in the balancing cylinder 22 into a mud chamber 23 and an oil chamber, and a piston tension spring 25, a moving rod 27 and a moving rod compression spring 26 are provided in the oil chamber, wherein one end of the piston tension spring 25 is fixed to one end of the cylinder, and the other end of the piston tension spring 25 is connected to one side of the moving piston 24, and one side of the moving piston 24 is also connected to one end of the moving rod compression spring 26, and the other end of the moving rod compression spring 26 is connected to one end of the moving rod 27, and the other end of the moving rod 27 is provided with a displacement sensor 28 for measuring the displacement of the moving piston 24, and a limiting structure is provided on the other end of the moving rod 27, and a locking structure is also connected to one side of the moving piston 24. The moving piston 24 drives the moving rod to move through the cooperation of the locking structure and the limiting structure.

[0073] Specifically, the balancing sub 2 includes a balancing sub outer shell 21, a balancing cylinder 22 is arranged in the balancing sub outer shell 21, and a moving piston 24 is arranged in the balancing cylinder 22. The moving piston 24 divides the space in the balancing body into a mud chamber 23 and an oil chamber that are isolated from each other. When the pressure in the mud chamber 23 increases, the mud in the mud chamber 23 pushes the moving piston 24 to move in the direction of compressing the hydraulic oil. When the pressure in the oil chamber increases, the oil in the oil chamber pushes the moving piston 24 to move in the direction of compressing the mud, thereby achieving the purpose of balancing the hydraulic oil pressure inside the instrument and the mud pressure in the downhole formation.

[0074] Again, the balancing sub 2 of this embodiment can also be used to detect the oil level of the coring tool. Specifically, a displacement sensor 28 is provided at the other end of the moving rod. The displacement of the moving piston 24 can be measured by the displacement sensor 28, so that the oil level of the coring tool can be determined by the displacement of the moving piston 24.

[0075] The balancing sub 2 of this embodiment adopts a balancing sub 2 with full-range oil level detection capability. During high-temperature and high-pressure operations, the expansion and compression of the hydraulic oil in the high-temperature and high-pressure environment can be measured in real time to ensure that the oil meets the operating requirements and improve the reliability of the coring instrument.

[0076] In one embodiment, the core storage sub 5 includes a plurality of core barrels, which are threadedly connected to each other, and the core storage sub 5 can be seated at the wellhead through a wellhead clamp; the uppermost core barrel is connected to the connecting barrel above it through a transition joint, and the uppermost core barrel is threadedly connected to the transition joint, and the upper end of the transition joint is fixedly connected to a plurality of clamping blocks, and the lower end of the connecting barrel is provided with a clamping groove that cooperates with the clamping block, and the transition joint and the connecting barrel are connected through the clamping block and the clamping groove, and a cotter pin is connected between the connecting barrel and the transition joint.

[0077] Specifically, the core storage sub 5 of this embodiment includes several core barrels, which are threadedly connected to each other. For example, including 80 or more core barrels, the core storage sub 5 can complete coring operations of 80 or more cores in a single trip, thereby improving coring efficiency. After the core barrels are connected, the core storage sub 5 of this embodiment can be installed at the wellhead via a wellhead chuck, allowing the core barrels to be arbitrarily lengthened, facilitating assembly of the core barrels. The core storage sub 5 can also be quickly connected to an upper structure, reducing deformation of the instrument compared to existing ground-mounted installation methods.

[0078] Again, the top core barrel is threadedly connected to the transition joint, and the transition joint is connected to the upper connecting barrel through a clamping block and a clamping groove, and a cotter pin is connected between the transition joint and the connecting barrel, which has the advantage of easy assembly.

[0079] It should be noted that, unless otherwise specified, the technical or scientific terms used in this application should have the common meanings understood by those skilled in the art to which this disclosure belongs.

[0080] In addition, the terms "first," "second," etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. In the description of this disclosure, "plurality" means more than two, unless otherwise specifically defined.

[0081] In this application, unless otherwise expressly specified or limited, terms such as "mounted," "connected," "connect," and "fixed" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components or interactions between two components. Those skilled in the art will understand the specific meanings of these terms in this disclosure based on specific circumstances.

[0082] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present disclosure, rather than to limit them. Although the present disclosure has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present disclosure, and they should all be included in the scope of the claims and specification of the present disclosure. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present disclosure is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A rotary wellbore coring tool comprising an electronic sub, a balancing sub, a hydraulic control sub, a mechanical execution sub and a core storage sub, characterized in that: The mechanical execution short section includes a mechanical section housing, a transmission device is provided in the mechanical section housing, the transmission device is connected to the drill bit assembly, the transmission device is used to drive the drill bit assembly to drill into the formation, break the core, retract and flip under the drive of the driving device, and after flipping, the axis of the drill bit assembly is parallel to the axis of the coring instrument, and a side opening is provided on the mechanical section housing for the drill bit assembly to extend out.

2. The rotary wellbore coring tool according to claim 1, characterized in that: The transmission device includes two limit guide rails arranged in parallel, and the two limit guide rails are fixedly connected to the mechanical section housing, each of the limit guide rails is provided with a first slide groove, and each limit guide rail is connected to a moving guide rail on the side away from the other limit guide rail, and each moving guide rail is provided with a second slide groove, the drill bit assembly is arranged between the two limit guide rails, and the corresponding two sides of the drill bit assembly are fixedly connected with a first slider, each of the first sliders passes through the corresponding first slide groove and extends into the second slide groove, and the two moving guide rails are connected to the driving device, and the driving device is used to drive the two moving guide rails to move up and down, so as to drive the drill bit assembly to drill into the formation, break the core, retract and flip through the cooperation of the first slide groove and the second slide groove.

3. The rotary wellbore coring tool according to claim 2, characterized in that: The upper ends of the two moving guide rails are connected to the upper fixed pull plate, and the lower ends of the two moving guide rails are connected to the lower fixed pull plate. The driving device is connected to the upper fixed pull plate to drive the upper fixed pull plate to move through the driving device to realize the up and down movement of the two moving guide rails.

4. The rotary wellbore coring tool according to claim 2, characterized in that: A mating slide groove is provided on the side of each of the limiting guide rails away from the other limiting guide rail, and each of the mating slide grooves extends in the vertical direction to both ends and passes through the corresponding limiting guide rails. A mating guide rail that cooperates with the mating slide groove is fixedly connected to each of the moving guide rails.

5. The rotary wellbore coring tool according to claim 2, characterized in that: The first slide groove includes a horizontal slide groove whose length direction is parallel to the drilling direction of the drill bit assembly, and the second slide groove includes a linear slide groove. There is an acute angle between the linear slide groove and the horizontal slide groove. The driving device is used to drive the two moving guide rails to move up and down, so as to drive the drill bit assembly to drill into the formation, break the core and retract it through the cooperation of the horizontal slide groove and the linear slide groove.

6. The rotary wellbore coring tool according to claim 5, characterized in that: The first slide groove also includes a first arc groove, the first arc groove is arranged at an end of the horizontal slide groove away from the side opening, the first arc groove is connected to the horizontal slide groove, the second slide groove also includes a second arc groove, the second arc groove is arranged at an end of the linear slide groove away from the side opening, the second arc groove is connected to the linear slide groove, and the two sides of the drill bit assembly are also fixedly connected to the second slider, and each of the limiting guide rails is also provided with a second slider matching groove connected to the horizontal slide groove. The driving device is used to drive the two moving guide rails to move so that the second slide groove pushes the first slider through the first arc groove, so that the second slider moves in the second slider matching groove to realize the flipping of the drill bit assembly.

7. The rotary wellbore coring tool according to claim 6, characterized in that: The first slider is a diamond slider, one set of parallel surfaces of the diamond slider contacts the two side walls of the horizontal slide, and another set of parallel surfaces of the diamond slider contacts the two side walls of the linear slide; the drill bit assembly includes a drill bit and a hydraulic motor connected to the drill bit, and the first slider and the second slider are both arranged on the hydraulic motor; the driving device includes a drilling hydraulic cylinder, and the piston rod of the drilling hydraulic cylinder is connected to the moving guide rail.

8. The rotary wellbore coring tool according to any one of claims 1 to 7, characterized in that: The hydraulic control sub includes a hydraulic sub body, an upper push arm and a reverse push arm are provided on the hydraulic sub body, the pushing direction of the upper push arm is opposite to the pushing direction of the reverse push arm, a lower push arm is provided on the mechanical sub housing, the pushing direction of the upper push arm is the same as that of the lower push arm, and the reverse push arm can be used alone to peel the coring tool from the well wall; The upper push arm and the reverse push arm have the same structure; the reverse push arm includes a reverse push hydraulic cylinder composed of a reverse push cylinder body, a first piston rod and a second piston rod, wherein the first piston rod is sealingly and slidingly connected in the reverse push cylinder body, a through hole is provided in the first piston rod, the second piston rod is sealingly and slidingly connected in the through hole, and the end of the second piston rod extending outside the first piston rod is fixedly connected to a push head, and the reverse push hydraulic cylinder is connected to a hydraulic control unit, which is used to control the extension of the first piston rod and the second piston rod in the reverse push cylinder body, and to control the retraction of the first piston rod and the second piston rod in the reverse push cylinder body.

9. The rotary wellbore coring tool according to claim 8, characterized in that: The electronic short section includes a thermal insulation outer shell, in which a plurality of electronic skeletons are arranged, each of which is used to fix a circuit board, and heat absorption units are arranged at both ends of each electronic skeleton, and the length of the heat absorption unit is determined by the heat generation of the circuit board on the electronic skeleton adjacent to it; an insulating sleeve is arranged above the uppermost heat absorption unit in the thermal insulation outer shell, and an insulating filler is arranged below the lowermost heat absorption unit in the thermal insulation outer shell; the upper end of the thermal insulation outer shell is connected to an upper joint, and the lower end of the thermal insulation outer shell is connected to an electronic plug connector, and the circuit board is connected to the electronic plug connector through the insulating filler and the heat absorption unit.

10. The rotary wellbore coring tool according to claim 9, characterized in that: The balancing short joint is arranged between the electronic short joint and the hydraulic control short joint. The balancing short joint includes a balancing joint outer shell, a balancing cylinder is arranged in the balancing cylinder, and a moving piston is arranged in the balancing cylinder. The moving piston divides the space in the balancing cylinder into a mud chamber and an oil chamber, and a piston tension spring, a moving rod and a moving rod compression spring are arranged in the oil chamber, wherein one end of the piston tension spring is fixed to one end of the cylinder, the other end of the piston tension spring is connected to one side of the moving piston, one side of the moving piston is also connected to one end of the moving rod compression spring, the other end of the moving rod compression spring is connected to one end of the moving rod, and the other end of the moving rod is provided with a displacement sensor for measuring the displacement of the moving piston, a limiting structure is provided on the other end of the moving rod, and a locking structure is also connected to one side of the moving piston, and the moving piston drives the moving rod to move through the cooperation of the locking structure and the limiting structure.

11. The rotary wellbore coring tool according to claim 10, characterized in that: The core storage sub includes several core barrels, which are threadedly connected to each other. The core storage sub can be seated at the wellhead through a wellhead clamp; the top core barrel is connected to the connecting barrel above it through a transition joint, and the top core barrel is threadedly connected to the transition joint. The upper end of the transition joint is fixedly connected to several clamping blocks, and the lower end of the connecting barrel is provided with a clamping groove that cooperates with the clamping block. The transition joint and the connecting barrel are connected through the clamping block and the clamping groove, and a cotter pin is connected between the connecting barrel and the transition joint.

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