A directional coring tool and a drilling rig bearing assembly thereof

Abstract

The present invention discloses a directional coring tool and a drilling rig bearing assembly thereof, and relates to the technical field of geological prospecting directional coring tools. The drilling rig bearing assembly comprises: a coupling, a housing, a stator support plate, a stator connector, a stator assembly, a rotor assembly and a drive shaft. The coupling, the stator support plate, the stator connector, the stator assembly, the rotor assembly and the drive shaft are sequentially sleeved on the outer periphery of the hollow core shaft, and the inner periphery of the coupling and the outer periphery of the hollow core shaft are clearance matched; the stator support plate and the stator assembly are both axially clearance matched with the stator connector, the rotor assembly and the stator assembly are matched and abutted, the drive shaft is arranged between the inner periphery of the rotor assembly and the outer periphery of the hollow core shaft, the housing is sleeved on the outer periphery of the rotor assembly, and the housing is connected to the coupling. The drilling rig bearing assembly provided by the present invention is a bearing suitable for directional coring drilling, which can effectively improve the use effect of the bearing assembly of the directional drilling tool and reduce the assembly difficulty of the bearing assembly.

Description

Technical Field

[0001] The present invention relates to the technical field of geological prospecting directional coring tools, and more specifically, to a drilling rig bearing assembly. In addition, the present invention also relates to a directional coring tool comprising the drilling rig bearing assembly. Background Art

[0002] At present, the design schemes of bearing assemblies for directional drilling at home and abroad still have certain deficiencies in function or structure, and cannot adapt to the directional coring operation environment. For example, the prior art discloses a directional rotary directional drilling tool, which includes a hollow mandrel, on the upper outer wall of the mandrel, an upper sealing assembly and an upper floating bearing for supporting the mandrel are fixed in sequence from top to bottom, the mandrel passes through an eccentric mechanism fixed on the inner wall of the outer shell, the lower end of the mandrel extends out of the outer shell and is connected to the hollow drill bit, and on the outer wall of the mandrel, there are a lower sealing assembly and a lower fixed bearing in sequence from bottom to top. However, the lower fixed bearing used does not allow the mandrel to tilt, and the tilt of the mandrel cannot be transmitted to the drill bit. In addition, the bearing adopts oil lubrication, which has strict requirements on sealing.

[0003] For example, the prior art discloses a screw-driven rotary directional drilling tool, which is mainly composed of a fixed joint, an upper housing, a flow baffle, a control part, a series disc spring, a center shaft, a control pin, a motor rotor mounting seat, a sliding housing, a motor housing, a motor rotor, a motor stator, a universal shaft, a lower housing, a guide shaft, an outer positioning sleeve, a seal, an adjustment sleeve, an inner positioning sleeve, a series bearing, a sealing ring, a guide joint, a guide telescopic block, a fixed seat, a discharge nozzle and a drill bit. When the tool is working, the drilling fluid flow path is changed by changing the drilling fluid pressure, and the drilling fluid forms a diversion inside the tool, driving the mud motor to rotate, changing the flow path connection state of the guide joint, controlling the movement of the guide telescopic block, completing the guiding action of the rotary directional tool, and realizing the guided drilling function. However, the bearing assembly used has strict requirements on sealing, and it is impossible to guide and coring at the same time.

[0004] In addition, the prior art also discloses a mechanical vertical drilling tool that can be used for coring, which includes an intermediate rotating shell, one end of which is connected to the stable platform shell, and the other end of which is connected to the upper angular contact bearing and the lower angular contact bearing in sequence, that is, the intermediate rotating shell is indirectly connected to the drill bit. During the drilling process, the drilling pressure and torque are transmitted to the drill bit through the stable platform shell, the intermediate transmission shell, the drill bit joint and other components. The center of the intermediate rotating shell is reserved with a space for placing the coring barrel, so that the operation of coring while vertically drilling can be realized. The drilling tool uses the eccentric torque generated by the gravity of the eccentric weight mechanism to monitor the well inclination, and drives the mechanical valve to control the action of the lower actuator, providing the drill bit with the force and angle required for descending and tilting, resulting in the drilling tool being only suitable for vertical directional coring drilling operations.

[0005] In summary, how to improve the use effect of the bearing assembly of the directional drilling tool and reduce the difficulty of assembling the bearing assembly is a problem that needs to be solved urgently by those skilled in the art. Summary of the invention

[0006] In view of this, an object of the present invention is to provide a drilling rig bearing assembly, which can effectively improve the use effect of the bearing assembly of a directional drilling tool and reduce the difficulty of assembling the bearing assembly.

[0007] Another object of the present invention is to provide a directional coring tool comprising the drilling rig bearing assembly.

[0008] In order to achieve the above object, the present invention provides the following technical solutions:

[0009] A drilling rig bearing assembly, comprising: a coupling, a housing, a stator support plate, a stator connector, a stator assembly, a rotor assembly and a drive shaft, wherein the coupling, the stator support plate, the stator connector, the stator assembly, the rotor assembly and the drive shaft are all annular structures and are sequentially sleeved on the outer periphery of a hollow core shaft, and the inner periphery of the coupling and the outer periphery of the hollow core shaft are clearance-matched;

[0010] The stator support plate is arranged on the inner periphery of the coupling, the stator support plate and the stator assembly are both matched with the stator connector in an axial clearance, the rotor assembly is matched and abutted with the stator assembly, the drive shaft is arranged between the inner periphery of the rotor assembly and the outer periphery of the hollow core shaft, the shell is sleeved on the outer periphery of the rotor assembly, and the shell is connected to the coupling.

[0011] Preferably, the coupling has a first inner hole, and the stator support plate is provided with a second inner hole, the first inner hole and the second inner hole can constitute a cavity for axially fixing a copper ring, and the inner periphery of the copper ring and the outer periphery of the hollow core shaft are clearance-matched.

[0012] Preferably, the inner circumference of the copper ring is provided with a plating layer.

[0013] Preferably, the inner periphery of the coupling is provided with a first inner rectangular spline, and the outer periphery of the stator support plate is provided with a first outer rectangular spline that cooperates and engages with the first inner rectangular spline;

[0014] Or the coupling and the stator support plate are radially connected via fixing pins and screws.

[0015] Preferably, one end of the stator support plate is provided with an outer spherical arc surface, the stator assembly is provided with an inner spherical arc surface, and the stator connector is provided with a through slot, and the outer spherical arc surface can pass through the through slot and abut against the inner spherical arc surface with a clearance fit.

[0016] Preferably, the inner spherical arc surface is provided with a second inner rectangular spline, the outer spherical arc surface is provided with a second outer rectangular spline, the stator connector is provided with a middle rectangular spline, and the second inner rectangular spline and the second outer rectangular spline are both engaged with the middle rectangular spline.

[0017] Preferably, the inner circumference of the coupling, the inner circumference of the stator support plate, the inner circumference of the stator connector, the inner circumference of the stator assembly, the inner circumference of the rotor assembly and the inner circumference of the drive shaft are all provided with a coating.

[0018] Preferably, the shell is provided with through holes along the circumferential direction, and the through holes are connected with the flow channel of the hollow core shaft to form a cooling and lubrication flow channel.

[0019] Preferably, the stator assembly and the rotor assembly may constitute a plane thrust bearing or a spherical bearing.

[0020] A directional coring tool, comprising: a hollow core shaft and a shell sleeved on the outer periphery of the hollow core shaft, wherein a fulcrum bearing assembly, an offset assembly and a cantilever bearing assembly are sequentially arranged between the hollow core shaft and the shell from bottom to top;

[0021] The lower end of the fulcrum bearing assembly is connected to the drill bit, and the upper end of the fulcrum bearing assembly is hinged to the hollow core shaft. The lower end of the cantilever bearing assembly is fixedly connected to the hollow core shaft, and the upper end of the cantilever bearing assembly is connected to the drill pipe. The offset assembly is used to adjust the eccentricity of the hollow core shaft. The outer periphery of the outer shell is provided with an openable and closable packer assembly. The opened packer assembly can clamp the outer shell in the hole wall. The cantilever bearing assembly is a drilling rig bearing assembly described in any of the above items.

[0022] When using the drill bearing assembly provided by the present invention, the directional coring tool generally includes a rotatable hollow mandrel and a non-rotatable outer shell, the upper end of the hollow mandrel is indirectly connected to the drill rod, and the lower end of the hollow mandrel is indirectly connected to the drill bit. During use, the coupling and the outer shell can be connected, and when the directional coring drilling operation is required, the outer shell does not rotate, which will make the coupling not rotate, the stator support plate arranged on the inner periphery of the coupling not rotate, and the stator assembly matched with the stator support plate through the stator connector also does not rotate, so that the stator assembly and the coupling can be indirectly radially fixed and kept relatively still.

[0023] Since the end of the drive shaft is connected to the drill pipe, the drive shaft and the drill pipe will rotate synchronously, and the rotor assembly is installed on the outer periphery of the drive shaft, so that the movement mode of the rotor assembly is consistent with that of the drive shaft, and the movement mode of the rotor assembly and the drill pipe is indirectly consistent. Finally, the coupling, the stator support plate, the stator connector and the stator assembly can constitute a stator structure, and the drive shaft and the rotor assembly can constitute a rotor structure. The stator structure and the rotor structure are used together to form a complete thrust bearing, which can withstand a certain axial force and effectively support the hollow core shaft.

[0024] Furthermore, since the stator support plate and the stator assembly are both matched with the stator connector in the axial clearance, the stator support plate and the stator assembly can be axially fixedly connected, and the parts can be allowed to move radially with a small arc and a small float as the hollow core shaft bends, so as to avoid transmitting the torque of the hollow core shaft to the drill rod assembly. In addition, the device has a simple structure and is easy to assemble, and can be promoted for use.

[0025] In summary, the drilling rig bearing assembly provided by the present invention can effectively improve the use effect of the bearing assembly of the directional drilling tool and reduce the difficulty of assembling the bearing assembly.

[0026] In addition, the present invention also provides a directional coring tool comprising the drilling rig bearing assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0028] Figure 1 A schematic diagram of the structure of a drilling rig bearing assembly provided by the present invention;

[0029] Figure 2 It is the structural schematic diagram of the coupling;

[0030] Figure 3 is a structural schematic diagram of a stator support plate;

[0031] Figure 4 is a structural schematic diagram of a stator connector;

[0032] Figure 5 is a structural schematic diagram of a stator assembly;

[0033] Figure 6 It is a schematic diagram of the structure of the directional coring tool when performing a straight-line drilling operation;

[0034] Figure 7 A schematic diagram of the structure of a directional coring tool during directional drilling operation.

[0035] Figure 1-Figure 7 middle:

[0036] 1 is a coupling, 2 is a housing, 3 is a stator support plate, 4 is a stator connector, 5 is a stator assembly, 6 is a rotor assembly, 7 is a drive shaft, 8 is a first inner hole, 9 is a second inner hole, 10 is a copper ring, 11 is a first inner rectangular spline, 12 is a first outer rectangular spline, 13 is an outer spherical arc surface, 14 is an inner spherical arc surface, 15 is a second inner rectangular spline, 16 is a second outer rectangular spline, 17 is a hollow core shaft, 18 is a housing, 19 is a fulcrum bearing assembly, 20 is an offset assembly, 21 is a cantilever bearing assembly, 22 is a drill pipe, 23 is a drill bit, 24 is a packer assembly, 25 is a through groove, and 26 is a middle rectangular spline. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] The core of the present invention is to provide a drilling rig bearing assembly, which can effectively improve the use effect of the bearing assembly of a directional drilling tool and reduce the difficulty of assembling the bearing assembly. Another core of the present invention is to provide a directional coring tool including the above-mentioned drilling rig bearing assembly.

[0039] Please refer to Figures 1 to 7 ,in, Figure 1 A schematic diagram of the structure of a drilling rig bearing assembly provided by the present invention; Figure 2 It is the structural schematic diagram of the coupling; Figure 3 is a structural schematic diagram of a stator support plate;

[0040] Figure 4 is a structural schematic diagram of a stator connector; Figure 5 is a structural schematic diagram of a stator assembly; Figure 6 It is a schematic diagram of the structure of the directional coring tool when performing a straight-line drilling operation; Figure 7 A schematic diagram of the structure of a directional coring tool during directional drilling operation.

[0041] The present specific embodiment provides a drilling rig bearing assembly, comprising: a coupling 1, a housing 2, a stator support plate 3, a stator connector 4, a stator assembly 5, a rotor assembly 6 and a drive shaft 7. The coupling 1, the stator support plate 3, the stator connector 4, the stator assembly 5, the rotor assembly 6 and the drive shaft 7 are all annular structures and are sequentially sleeved on the outer periphery of a hollow core shaft 17. The inner periphery of the coupling 1 and the outer periphery of the hollow core shaft 17 are clearance-matched; the stator support plate 3 is arranged on the inner periphery of the coupling 1, the stator support plate 3 and the stator assembly 5 are both axially clearance-matched with the stator connector 4, the rotor assembly 6 and the stator assembly 5 are in abutment with each other, the drive shaft 7 is arranged between the inner periphery of the rotor assembly 6 and the outer periphery of the hollow core shaft 17, the housing 2 is sleeved on the outer periphery of the rotor assembly 6, and the housing 2 is connected to the coupling 1.

[0042] It should be noted that the drill bearing assembly provided by the present invention is a bearing suitable for directional coring drilling. The rotor assembly 6 is in abutment with the stator assembly 5, which means that the stator assembly 5 and the rotor assembly 6 are used in conjunction with each other to form a complete thrust bearing, which can withstand a certain axial force. The parts of the drill bearing assembly are all annular structures, so as to cooperate with the hollow core shaft 17. When the directional coring tool performs directional coring drilling operations, the drill can drive the hollow core shaft 17 and the drill bit 23 assembly to rotate, while the outer shell 18 of the directional coring tool does not rotate, so as to realize the function of rotary directional cutting. The drill bearing assembly can effectively rotatably support the hollow core shaft 17, thereby improving the use effect of the directional coring tool.

[0043] In actual use, the shape, structure, size, material, etc. of the coupling 1, housing 2, stator support plate 3, stator connector 4, stator assembly 5, rotor assembly 6 and drive shaft 7 can be determined according to actual conditions and actual needs.

[0044] When the drilling rig bearing assembly provided by the present invention is used, the directional coring tool generally includes a rotatable hollow mandrel 17 and a non-rotatable housing 18, the upper end of the hollow mandrel 17 is indirectly connected to the drill rod 22, and the lower end of the hollow mandrel 17 is indirectly connected to the drill bit 23. During use, the coupling 1 and the housing 18 can be connected, and when the directional coring drilling operation is required, the housing 18 does not rotate, which will make the coupling 1 not rotate, the stator support plate 3 arranged on the inner periphery of the coupling 1 also does not rotate, and the stator assembly 5 matched with the stator support plate 3 through the stator connector 4 also does not rotate, which means that the stator assembly 5 and the coupling 1 are indirectly radially fixed and kept relatively still.

[0045] Since the end of the drive shaft 7 is connected to the drill rod 22, the drive shaft 7 and the drill rod 22 will rotate synchronously, and the rotor assembly 6 is installed on the outer periphery of the drive shaft 7, so that the movement mode of the rotor assembly 6 is consistent with that of the drive shaft 7, that is, the movement mode of the rotor assembly 6 and the drill rod 22 is indirectly consistent. Finally, the coupling 1, the stator support plate 3, the stator connector 4 and the stator assembly 5 can constitute a stator structure, and the drive shaft 7 and the rotor assembly 6 can constitute a rotor structure. The stator structure and the rotor structure are used together to form a complete thrust bearing, which can withstand a certain axial force and effectively support the hollow core shaft 17 in rotation.

[0046] Furthermore, since the stator support plate 3 and the stator assembly 5 are both matched with the stator connector 4 in an axial clearance, the stator support plate 3 and the stator assembly 5 can be axially fixedly connected, and the parts can be allowed to move radially with a small arc and a small float as the hollow core shaft 17 bends, so as to avoid transmitting the torque of the hollow core shaft 17 to the drill rod 22 assembly. In addition, the device has a simple structure and is easy to assemble, and can be promoted for use.

[0047] In summary, the drilling rig bearing assembly provided by the present invention can effectively improve the use effect of the bearing assembly of the directional drilling tool and reduce the difficulty of assembling the bearing assembly.

[0048] On the basis of the above embodiments, preferably, the coupling 1 is provided with a first inner hole 8, and the stator support plate 3 is provided with a second inner hole 9. The first inner hole 8 and the second inner hole 9 can constitute a cavity for axially fixing the copper ring 10, and the inner periphery of the copper ring 10 and the outer periphery of the hollow core shaft 17 are clearance-matched.

[0049] It should be noted that the first inner hole 8 of the coupling 1 and the second inner hole 9 of the stator support plate 3 are both matched with the outer surface of the copper ring 10, so that the copper ring 10 is axially fixed and constrained by the cavity constructed by the coupling 1 and the stator support plate 3 in the axial direction. In addition, since the copper ring 10 and the stator support plate 3 are both matched with the hollow core shaft 17 with equal diameter clearance, the positions of the copper ring 10 and the stator support plate 3 can be used as the fixed hinge end of the hollow core shaft 17, thereby correcting the bent hollow core shaft 17 here. At the same time, the parts inside the coupling 1 can move radially with the hollow core shaft 17 in a small range to avoid transmitting the torque of the hollow core shaft 17 to the rear-end parts.

[0050] It should also be noted that in addition to setting the copper ring 10 and the hollow core shaft 17, the stator support plate 3 and the hollow core shaft 17 as clearance fit, they can also be replaced by diamond coating or the like, so that the rotation of the hollow core shaft 17 relative to the coupling 1 is smoother.

[0051] Preferably, the inner circumference of the copper ring 10 is provided with a coating to improve the wear resistance and service life of the copper ring 10 .

[0052] Preferably, the inner periphery of the coupling 1 is provided with a first inner rectangular spline 11, and the outer periphery of the stator support plate 3 is provided with a first outer rectangular spline 12 that cooperates and engages with the first inner rectangular spline 11; or the coupling 1 and the stator support plate 3 are radially connected by fixing pins and screws.

[0053] It should be noted that the first outer rectangular spline 12 of the stator support plate 3 is engaged with the first inner rectangular spline 11 of the coupling 1, or the coupling 1 and the stator support plate 3 are radially connected by fixing pins and screws, which can ensure the connection effect of the coupling 1 and the stator support plate 3. In addition, the coupling 1 can also be threadedly connected to the housing 2, so that the connection and assembly method of the device is reliable, which is very suitable for occasions where the installation space is narrow due to the cooperation of the inner and outer multi-layer parts of the small-diameter coring drill.

[0054] On the basis of the above embodiment, preferably, one end of the stator support plate 3 is provided with an outer spherical arc surface 13, the stator assembly 5 is provided with an inner spherical arc surface 14, and the stator connector 4 is provided with a through slot 25, and the outer spherical arc surface 13 can pass through the through slot 25 and abut with the inner spherical arc surface 14 with clearance fit. Among them, the stator support plate 3 and the stator assembly 5 can achieve a small floating adjustment of the components in the coupling 1 along with the hollow core shaft 17 through spherical fit, so as to avoid transmitting the torque of the hollow core shaft 17 to the rear end components.

[0055] Preferably, the inner spherical arc surface 14 is provided with a second inner rectangular spline 15, the outer spherical arc surface 13 is provided with a second outer rectangular spline 16, the stator connector 4 is provided with a middle rectangular spline 26, and the second inner rectangular spline 15 and the second outer rectangular spline 16 are both engaged with the middle rectangular spline 26 to ensure radial fixation of the stator support plate 3, the stator connector 4 and the stator assembly 5.

[0056] It should be noted that due to the long length of the hollow core shaft 17, the curvature radius of the directional drilling trajectory of the directional coring tool will be larger. In order to avoid the small arc bending effect on the rear end parts of the hollow core shaft 17 after correcting the hollow core shaft 17 at the copper ring 10, the outer spherical arc surface 13 of the stator support plate 3 and the inner spherical arc surface 14 of the stator assembly 5 are clearance-matched, and the second inner rectangular spline 15 of the stator support plate 3 and the second outer rectangular spline 16 of the stator assembly 5 are elastically matched with the middle rectangular spline 26 of the stator connector 4 to ensure that the stator support plate 3 and the stator assembly 5 are fixedly connected in a directional manner, while also allowing the corresponding components to move radially with a small arc and small floating as the hollow core shaft 17 bends.

[0057] It should also be noted that by adopting rectangular spline matching, spherical matching and other methods, the purpose of the stator structure part of the drilling rig bearing assembly not rotating and the rotor structure part rotating can be achieved. Moreover, this assembly method has a simple structure and is easy to assemble, which is very suitable for environments with narrow annular space.

[0058] Preferably, the inner periphery of the coupling 1, the inner periphery of the stator support plate 3, the inner periphery of the stator connector 4, the inner periphery of the stator assembly 5, the inner periphery of the rotor assembly 6 and the inner periphery of the drive shaft 7 are all provided with a coating to improve the wear resistance and service life of each component.

[0059] Preferably, the housing 2 is provided with through holes along the circumferential direction, and the through holes are communicated with the flow channel of the hollow core shaft 17 to form a cooling and lubricating flow channel.

[0060] It should be noted that the stator assembly 5 is used in conjunction with the rotor assembly 6, and both are installed inside the housing 2. The through hole, the stator assembly 5 and the rotor assembly 6 can form a cooling channel together with the flow channel of the hollow core shaft 17 to provide a cooling and lubricating environment for the bearing assembly. Since the device uses drilling fluid cooling and lubrication, it does not require a strict sealing system, avoiding the lack of space for storing lubricants or the worry that drilling fluid will invade the lubricant and affect the lubrication effect. In addition, the stator assembly 5 and the rotor assembly 6 can be set as a blade structure to replace the small hole flow cooling method, thereby providing a better lubrication and cooling environment for the bearing assembly.

[0061] Preferably, the stator assembly 5 and the rotor assembly 6 may constitute a plane thrust bearing or a spherical bearing.

[0062] It should be noted that the plane thrust bearing or spherical bearing formed by the stator assembly 5 and the rotor assembly 6 has a small installation space and can withstand a certain axial force. Moreover, the bearing can work normally in a mud environment, so that the device can be cooled and lubricated by drilling fluid without a complex sealing system. That is, the cooling and lubrication requirements of the bearing assembly can be met by simply setting the flow channel of the housing 2, the stator assembly 5, the rotor assembly 6 and the hollow core shaft 17. The bearing assembly is suitable for use in the case of insufficient radial space.

[0063] In addition to the above-mentioned drilling rig bearing assembly, the present invention also provides a directional coring tool including the drilling rig bearing assembly disclosed in the above-mentioned embodiment, the directional coring tool includes: a hollow core shaft 17 and a shell 18 sleeved on the outer periphery of the hollow core shaft 17, a fulcrum bearing assembly 19, an offset assembly 20 and a cantilever bearing assembly 21 are arranged between the hollow core shaft 17 and the shell 18 from bottom to top; the lower end of the fulcrum bearing assembly 19 is connected to the drill bit 23, and the upper end of the fulcrum bearing assembly 19 is hinged to the hollow core shaft 17, the lower end of the cantilever bearing assembly 21 is fixedly connected to the hollow core shaft 17, and the upper end of the cantilever bearing assembly 21 is connected to the drill pipe 22, the offset assembly 20 is used to adjust the eccentricity of the hollow core shaft 17, and the outer periphery of the shell 18 is provided with an openable and closable packer assembly 24, the opened packer assembly 24 can clamp the shell 18 in the hole wall, and the cantilever bearing assembly 21 is any of the above-mentioned drilling rig bearing assemblies. For the structures of other parts of the directional coring tool, please refer to the prior art and will not be described in detail in this article.

[0064] It should be noted that the offset assembly 20 is used to adjust the eccentricity of the hollow core shaft 17. It can be said that the offset assembly 20 is a three-layer casing structure, the innermost casing is connected to the hollow core shaft 17 with equal diameters, and the outermost two casings are distributed in inner and outer eccentric circles. By adjusting the position of the second casing, the innermost casing can be eccentrically swung to make the hollow core shaft 17 bend and displace in any direction, thereby adjusting the eccentricity of the hollow core shaft 17. When the directional coring tool performs a straight drilling operation, the hollow core shaft 17 does not bend or deform. The structure is as follows: Figure 6 As shown, when the directional coring tool needs to perform directional drilling operation, the offset assembly 20 can be used to bend and deform the hollow mandrel 17. Figure 7 shown.

[0065] It should also be noted that the fulcrum bearing assembly 19 is hinged with the hollow mandrel 17, so the fulcrum bearing assembly 19 can allow the hollow mandrel 17 to tilt at a certain angle, that is, the fulcrum bearing assembly 19 can transfer the bending of the hollow mandrel 17 to the drill bit 23, so that the drill bit 23 has a lateral tilt angle. The cantilever bearing assembly 21 is fixedly connected to the hollow mandrel 17, so the cantilever bearing assembly 21 will not transfer the bending deformation of the hollow mandrel 17 to the drill pipe 22, so that the hollow mandrel 17 can be straightened at the cantilever bearing assembly 21. After the packer assembly 24 is opened, it can clamp the hole wall to lock the shell 18 in the hole wall, thereby preventing the shell 18 from rotating, and the hollow mandrel 17 and the drill bit 23 can be rotated to adjust the tilt angle of the drill bit 23.

[0066] In addition, it should be noted that when using the directional coring tool, the drilling fluid can flow in from the inside of the drill pipe 22, pass through the hollow core shaft 17, the fulcrum bearing assembly 19, flow out at the drill bit 23, and return after reaching the bottom of the hole. After that, the drilling fluid can flow out between the outer shell 18 of the directional coring tool and the hole wall, and the packer assembly 24 can expand and clamp the hole wall under the pressure of the drilling fluid. Then, the whole machine can transmit the torque to the drill pipe 22, and the drill pipe 22 transmits the torque to the hollow core shaft 17, and then transmits it to the drill bit 23 through the inner drive shaft 7 of the fulcrum bearing assembly 19. Among them, the cantilever bearing assembly 21, the offset assembly 20, the fulcrum bearing assembly 19 and the housing 2 are successively threaded to form an integral structure. When the packer assembly 24 is clamped on the hole wall, the outer shell 18 can be stopped from rotating, and only the hollow core shaft 17 can rotate, thereby realizing the rotary cutting function of the directional coring tool.

[0067] It should be noted that the first inner hole 8 and the second inner hole 9, the first inner rectangular spline 11 and the second inner rectangular spline 15, the first outer rectangular spline 12 and the second outer rectangular spline 16 mentioned in the present application document, where the first and the second are only for distinguishing the different positions, and there is no order of precedence.

[0068] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. Any combination of all embodiments provided by the present invention is within the protection scope of this invention and will not be described in detail here.

[0069] The directional coring tool and the drilling rig bearing assembly provided by the present invention are introduced in detail above. Specific examples are used in this article to illustrate the principle and implementation mode of the present invention. The description of the above embodiments is only used to help understand the method and core idea of ​​the present invention. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A drilling rig bearing assembly, characterized in that: include: A coupling (1), a housing (2), a stator support plate (3), a stator connector (4), a stator assembly (5), a rotor assembly (6) and a drive shaft (7); the coupling (1), the stator support plate (3), the stator connector (4), the stator assembly (5), the rotor assembly (6) and the drive shaft (7) are all annular structures and are sequentially sleeved on the outer periphery of a hollow core shaft (17); an inner periphery of the coupling (1) and an outer periphery of the hollow core shaft (17) are clearance-matched; The stator support plate (3) is arranged on the inner periphery of the coupling (1); the stator support plate (3) and the stator assembly (5) are both axially clearance-matched with the stator connector (4); the rotor assembly (6) is in abutment with the stator assembly (5); the drive shaft (7) is arranged between the inner periphery of the rotor assembly (6) and the outer periphery of the hollow core shaft (17); the housing (2) is sleeved on the outer periphery of the rotor assembly (6), and the housing (2) is connected to the coupling (1); The coupling (1) has a first inner hole (8), and the stator support plate (3) is provided with a second inner hole (9). The first inner hole (8) and the second inner hole (9) can constitute a cavity for axially fixing the copper ring (10). The inner periphery of the copper ring (10) and the outer periphery of the hollow core shaft (17) are clearance-matched, so that the positions of the copper ring (10) and the stator support plate (3) serve as the fixed hinge end of the hollow core shaft (17), and the bent hollow core shaft (17) is corrected at this point; one end of the stator support plate (3) is provided with an outer spherical arc surface (13), the stator assembly (5) is provided with an inner spherical arc surface (14), and the stator connector (4) is provided with a plurality of inner spherical arc surfaces (15). ) is provided with a through groove (25), the outer spherical arc surface (13) can pass through the through groove (25) and abut with the inner spherical arc surface (14) with clearance fit; the inner spherical arc surface (14) is provided with a second inner rectangular spline (15), the outer spherical arc surface (13) is provided with a second outer rectangular spline (16), the stator connector (4) is provided with a middle rectangular spline (26), the second inner rectangular spline (15) and the second outer rectangular spline (16) are both engaged and snap-fitted with the middle rectangular spline (26), so that the parts inside the coupling (1) move radially with the hollow core shaft (17), thereby avoiding the torque of the hollow core shaft (17) from being transmitted to the rear end parts.

2. The drilling rig bearing assembly according to claim 1, characterized in that: The inner circumference of the copper ring (10) is provided with a plating layer.

3. The drilling rig bearing assembly according to claim 1, characterized in that: The inner periphery of the coupling (1) is provided with a first inner rectangular spline (11), and the outer periphery of the stator support plate (3) is provided with a first outer rectangular spline (12) that cooperates and engages with the first inner rectangular spline (11); Or the coupling (1) and the stator support plate (3) are radially connected via fixing pins and screws.

4. The drilling rig bearing assembly according to any one of claims 1 to 3, characterized in that: The inner circumference of the coupling (1), the inner circumference of the stator support plate (3), the inner circumference of the stator connector (4), the inner circumference of the stator assembly (5), the inner circumference of the rotor assembly (6) and the inner circumference of the drive shaft (7) are all provided with a coating.

5. The drilling rig bearing assembly according to any one of claims 1 to 3, characterized in that: The shell (2) is provided with a through hole along the circumferential direction, and the through hole is connected with the flow channel of the hollow core shaft (17) to form a cooling and lubricating flow channel.

6. The drilling rig bearing assembly according to any one of claims 1 to 3, characterized in that: The stator assembly (5) and the rotor assembly (6) can constitute a plane thrust bearing or a spherical bearing.

7. A directional coring tool, characterized in that: include: A hollow core shaft (17) and a housing (18) sleeved on the outer periphery of the hollow core shaft (17), wherein a fulcrum bearing assembly (19), an offset assembly (20) and a cantilever bearing assembly (21) are sequentially arranged between the hollow core shaft (17) and the housing (18) from bottom to top; The lower end of the fulcrum bearing assembly (19) is connected to the drill bit (23), and the upper end of the fulcrum bearing assembly (19) is hinged to the hollow core shaft (17). The lower end of the cantilever bearing assembly (21) is fixedly connected to the hollow core shaft (17), and the upper end of the cantilever bearing assembly (21) is connected to the drill pipe (22). The offset assembly (20) is used to adjust the eccentricity of the hollow core shaft (17). The outer periphery of the outer shell (18) is provided with an openable and closable packer assembly (24). The opened packer assembly (24) can clamp the outer shell (18) in the hole wall. The cantilever bearing assembly (21) is a drilling rig bearing assembly as described in any one of claims 1 to 6.

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