CN114809905A - Directional coring tool and drilling machine bearing assembly thereof - Google Patents

Abstract

The invention discloses a directional coring tool and a drill bearing assembly thereof, relating to the technical field of geological exploration directional coring tools, wherein the drill bearing assembly comprises: the coupler, the stator supporting plate, the stator connecting piece, the stator assembly, the rotor assembly and the driving shaft are sequentially sleeved on the outer periphery of the hollow mandrel, and the inner periphery of the coupler is in clearance fit with the outer periphery of the hollow mandrel; stator backup pad and stator module all with stator connecting piece axial clearance fit, rotor subassembly and stator module cooperation butt, the drive shaft is located between the outer peripheral part of the inner peripheral part of rotor subassembly and hollow core axle, the outer peripheral part of rotor subassembly is located to the casing cover, and casing and coupling joint. The bearing assembly of the drilling machine is suitable for directional core drilling, can effectively improve the using effect of the bearing assembly of a directional drilling tool and reduce the assembly difficulty of the bearing assembly.

Description

A directional coring tool and its rig bearing assembly

technical field

The invention relates to the technical field of directional coring tools for geological exploration, and more particularly, to a bearing assembly of a drilling rig. In addition, it also relates to a directional coring tool comprising the above-mentioned drilling rig bearing assembly.

Background technique

At present, the design schemes of bearing components 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, a directional rotary steerable drilling tool disclosed in the prior art includes a hollow mandrel, and an upper sealing assembly and an upper floating bearing for supporting the mandrel are fixed on the outer wall of the upper part of the mandrel in order from top to bottom. Through an eccentric mechanism installed and fixed on the inner wall of the casing, the lower end of the mandrel protrudes out of the casing and is connected with the hollow drill bit. The outer wall of the mandrel is sequentially provided with a lower sealing assembly and a lower fixed bearing from bottom to top. However, the lower fixed bearing used does not allow the inclination of the mandrel and cannot transmit the inclination of the mandrel to the drill bit. And the bearing adopts oil lubricating form and has strict requirements on sealing.

For example, the prior art discloses a screw-driven rotary steerable drilling tool, which is mainly composed of a fixed joint, an upper casing, a flow baffle, a control member, a series disc spring, a central shaft, a control pin, a motor rotor mount, a sliding Housing, motor housing, motor rotor, motor stator, universal shaft, lower housing, guide shaft, outer locating sleeve, seal, adjusting sleeve, inner locating sleeve, string bearing, sealing ring, guide joint, guide telescopic block, It consists of a fixed seat, a discharge nozzle and a drill bit. When the tool is working, by changing the drilling fluid pressure, the drilling fluid flow path changes, the drilling fluid forms a shunt inside the tool, drives the mud motor to rotate, changes the flow channel connection state of the steering joint, controls the movement of the steering telescopic block, and completes the rotation of the steering tool. Steering action to realize the function of steered drilling. However, the bearing assembly used has strict requirements on sealing, and cannot be guided and cored at the same time.

In addition, the prior art also discloses a mechanical vertical drilling tool that can be used for coring, which includes an intermediate rotating casing, one end of the intermediate rotating casing is connected to the stable platform casing, and the other end of the intermediate rotating casing is sequentially connected to the upper angular contact bearing. , The lower angular contact bearing is connected, that is, the middle rotating shell is indirectly connected with the drill bit. During the drilling process, the WOB and torque are transmitted to the drill bit through the stable platform shell, the intermediate transmission shell and the drill bit joint, etc. The center of the intermediate rotating shell has a space for placing the core barrel, which can realize the operation of core drilling while drilling vertically. . The drilling tool uses the eccentric torque generated by the gravity of the eccentric mechanism to monitor the well deviation, and drives the mechanical valve to control the action of the lower actuator to provide the drill bit with the force and rotation angle required for descending and tilting, resulting in the drilling tool only suitable for vertical orientation. Core drilling operations.

To sum up, how to improve the use effect of the bearing assembly of the directional drilling tool and reduce the assembly difficulty of the bearing assembly is an urgent problem to be solved by those skilled in the art.

SUMMARY OF THE INVENTION

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

Another object of the present invention is to provide a directional coring tool comprising the above drill rig bearing assembly.

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

A drilling rig bearing assembly, comprising: a coupling, a housing, a stator support plate, a stator connection piece, a stator assembly, a rotor assembly and a drive shaft, the coupling, the stator support plate, the stator connection piece, The stator assembly, the rotor assembly and the drive shaft are all annular structures, and are sequentially sleeved on the outer circumference of the hollow core shaft, the inner circumference of the coupling and the outer circumference of the hollow core shaft clearance fit;

The stator support plate is arranged on the inner peripheral portion of the coupling, the stator support plate and the stator assembly are axially clearance-fitted with the stator connecting piece, and the rotor assembly is matched with the stator assembly to abut against it. Then, the drive shaft is arranged between the inner peripheral portion of the rotor assembly and the outer peripheral portion of the hollow core shaft, the casing is sleeved on the outer peripheral portion of the rotor assembly, and the casing is connected to the outer peripheral portion of the rotor assembly. the coupling connection.

Preferably, the coupling has a first inner hole, the stator support plate has a second inner hole, and the first inner hole and the second inner hole can form a cavity for axially fixing the copper ring body, the inner peripheral portion of the copper ring and the outer peripheral portion of the hollow mandrel are in clearance fit.

Preferably, the inner periphery of the copper ring is provided with a plating layer.

Preferably, the inner peripheral portion of the coupling is provided with a first inner rectangular spline, and the outer peripheral portion of the stator support plate is provided with a first outer rectangular spline that is engaged with the first inner rectangular spline. ;

Or the coupling and the stator support plate are radially connected by fixing pins and screws.

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, the stator connector is provided with a through slot, and the outer spherical arc surface can pass through the through hole. The groove is in clearance fit contact with the inner spherical arc surface.

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 is provided. Both the rectangular spline and the second outer rectangular spline are engaged and engaged with the middle rectangular spline.

Preferably, the inner peripheral portion of the coupling, the inner peripheral portion of the stator support plate, the inner peripheral portion of the stator connector, the inner peripheral portion of the stator assembly, the inner peripheral portion of the rotor assembly And the inner peripheral part of the drive shaft is provided with a plating layer.

Preferably, the casing is provided with a through hole in the circumferential direction, and the through hole communicates with the flow channel of the hollow mandrel to form a cooling and lubricating flow channel.

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

A directional coring tool, comprising: a hollow core shaft and a casing sleeved on the outer periphery of the hollow core shaft; Mounting components and cantilever bearing components;

The lower end of the fulcrum bearing assembly is connected with the drill bit, the upper end of the fulcrum bearing assembly is hinged with the hollow mandrel, the lower end of the cantilever bearing assembly is fixedly connected with the hollow mandrel, and the upper end of the cantilever bearing assembly is connected to the hollow mandrel. The drill pipe is connected, the biasing assembly is used to adjust the eccentricity of the hollow core shaft, the outer periphery of the casing is provided with an openable and closable packer assembly, and the open The housing is clamped in the hole wall, and the cantilever bearing assembly is the drill rig bearing assembly described in any one of the above.

When using the drilling rig bearing assembly provided by the present invention, the directional coring tool generally includes a rotatable hollow mandrel and a non-rotatable casing, the upper end of the hollow mandrel is indirectly connected with the drill pipe, and the lower end of the hollow mandrel is indirectly connected to the drill pipe. connected to the drill bit. During use, the coupling can be connected to the shell. When the directional core drilling operation is required, the shell will not rotate, which will prevent the coupling from rotating. The stator support plate located on the inner circumference of the coupling It does not rotate, and the stator assembly that is matched with the stator support plate through the stator connector does not rotate, that is, the stator assembly and the coupling can be indirectly fixed radially and kept relatively static.

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 of the rotor assembly and the drive shaft are consistent, that is, the rotor assembly and the The movement of the drill pipe is indirectly consistent. Ultimately, the coupling, stator support plate, stator connections, and stator assembly can form a stator structure, and the drive shaft and rotor assembly can form a rotor structure, which cooperates with the rotor structure to form a complete thrust bearing that can withstand A certain axial force can effectively rotate and support the hollow mandrel.

Moreover, since both the stator support plate and the stator assembly are axially clearance-fitted with the stator connector, this can ensure the axial fixed connection between the stator support plate and the stator assembly, and at the same time allow the small radian of the components to follow the hollow core shaft. Bent, small floating radial movement to avoid torque transfer of the hollow mandrel into the drill pipe assembly. In addition, the device has simple structure and convenient assembly, and can be popularized and used.

To sum up, the bearing assembly of the drilling rig provided by the present invention can effectively improve the use effect of the bearing assembly of the directional drilling tool, and reduce the assembly difficulty of the bearing assembly.

In addition, the present invention also provides a directional coring tool comprising the above-mentioned drill rig bearing assembly.

Description of drawings

In order to explain the embodiments of the present invention or the technical solutions in the prior art more clearly, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only It is an embodiment of the present invention. For those of ordinary skill in the art, other drawings can also be obtained according to the provided drawings without creative work.

1 is a schematic structural diagram of a drilling rig bearing assembly provided by the present invention;

Fig. 2 is the structural representation of the coupling;

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

Figure 4 is a schematic structural diagram of a stator connector;

5 is a schematic structural diagram of a stator assembly;

6 is a schematic structural diagram of a directional coring tool performing a linear drilling operation;

FIG. 7 is a schematic structural diagram of a directional coring tool when performing a directional drilling operation.

In Figure 1-Figure 7:

1 is the coupling, 2 is the housing, 3 is the stator support plate, 4 is the stator connection, 5 is the stator assembly, 6 is the rotor assembly, 7 is the drive shaft, 8 is the first inner hole, and 9 is the second inner hole. The hole, 10 is a copper ring, 11 is the first inner rectangular spline, 12 is the first outer rectangular spline, 13 is the outer spherical arc surface, 14 is the inner spherical arc surface, 15 is the second inner rectangular spline, 16 is the The second outer rectangular spline, 17 is a hollow mandrel, 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, and 24 is a packer assembly , 25 is a through slot, 26 is a rectangular spline in the middle.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

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

Please refer to FIGS. 1 to 7, wherein, FIG. 1 is a schematic structural diagram of a drilling rig bearing assembly provided by the present invention; FIG. 2 is a structural schematic diagram of a coupling; FIG. 3 is a structural schematic diagram of a stator support plate;

Fig. 4 is the structural representation of the stator connector; Fig. 5 is the structural representation of the stator assembly; Fig. 6 is the structural representation when the directional coring tool performs the linear drilling operation; Fig. 7 is the directional coring tool when the directional drilling operation is performed Schematic.

This specific embodiment provides a drilling rig bearing assembly, comprising: a coupling 1, a housing 2, a stator support plate 3, a stator connecting piece 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 circumference of the hollow core shaft 17 , the inner circumference of the coupling 1 and the hollow shaft The outer circumference of the mandrel 17 is in clearance fit; the stator support plate 3 is arranged on the inner circumference of the coupling 1, the stator support plate 3 and the stator assembly 5 are axially clearance-fitted with the stator connector 4, and the rotor assembly 6 and the stator assembly 5 are in clearance fit. The drive shaft 7 is arranged between the inner peripheral portion of the rotor assembly 6 and the outer peripheral portion of the hollow core shaft 17 , the casing 2 is sleeved on the outer peripheral portion of the rotor assembly 6 , and the casing 2 is connected with the coupling 1 . .

It should be noted that the drill bearing assembly provided by the present invention is a bearing suitable for directional core drilling. The rotor assembly 6 is in abutment with the stator assembly 5, and the designated subassembly 5 is used in cooperation with the rotor assembly 6 to form a complete thrust bearing, which can bear a certain axial force. The parts of the drill rig bearing assembly are all ring-shaped structures, so as to cooperate with the hollow mandrel 17. When the directional coring tool performs the directional coring drilling operation, the drill rig can drive the hollow mandrel 17 and the drill bit 23 assembly to rotate, and the directional coring tool can rotate. The housing 18 of the core tool does not rotate to perform the function of rotationally oriented cutting. The drilling rig bearing assembly can effectively rotatably support the hollow mandrel 17 and improve the use effect of the directional coring tool.

In the actual application process, according to the actual situation and actual needs, the shape, structure and size of the coupling 1, the casing 2, the stator support plate 3, the stator connecting piece 4, the stator assembly 5, the rotor assembly 6 and the drive shaft 7 can be adjusted. , material, etc.

When using the drill bearing assembly provided by the present invention, the directional coring tool generally includes a rotatable hollow mandrel 17 and a non-rotatable casing 18, the upper end of the hollow mandrel 17 is indirectly connected with the drill pipe 22, and the hollow core The lower end of the shaft 17 is indirectly connected to the drill bit 23 . During use, the coupling 1 and the casing 18 can be connected. When the directional core drilling operation is required, the casing 18 does not rotate, so that the coupling 1 does not rotate. The stator support plate 3 of the outer part does not rotate, and the stator assembly 5 that cooperates with the stator support plate 3 through the stator connector 4 also does not rotate, that is, the stator assembly 5 and the coupling 1 can be indirectly fixed radially and kept relatively static. .

Since the end of the drive shaft 7 is connected with 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 of the rotor assembly 6 and the drive shaft 7 is maintained. Consistent, that is, the movement of the rotor assembly 6 and the drill rod 22 are indirectly consistent. Finally, the coupling 1 , the stator support plate 3 , the stator connection piece 4 and the stator assembly 5 can form a stator structure, the drive shaft 7 and the rotor assembly 6 can form a rotor structure, and the stator structure and the rotor structure are used together to form a complete The thrust bearing, which can bear a certain axial force, effectively rotates and supports the hollow core shaft 17 .

Moreover, since both the stator support plate 3 and the stator assembly 5 are axially clearance-fitted with the stator connector 4, this can ensure that the stator support plate 3 and the stator assembly 5 are axially fixedly connected, and at the same time, a small curvature of the components can be allowed here. As the hollow mandrel 17 bends, a small floating radial movement occurs to avoid transmitting the torque of the hollow mandrel 17 into the drill rod 22 assembly. In addition, the device has simple structure and convenient assembly, and can be popularized and used.

To sum up, the bearing assembly of the drilling rig provided by the present invention can effectively improve the use effect of the bearing assembly of the directional drilling tool, and reduce the assembly difficulty of the bearing assembly.

On the basis of the above embodiment, 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, and the first inner hole 8 and the second inner hole 9 can be configured for The cavity of the copper ring 10 is axially fixed, and the inner peripheral portion of the copper ring 10 and the outer peripheral portion of the hollow mandrel 17 are in clearance fit.

It should be noted that both the first inner hole 8 of the coupling 1 and the second inner hole 9 of the stator support plate 3 are matched with the outer surface of the copper ring 10 , so that the copper ring 10 is axially displaced by the coupling 1 The cavity formed by the stator support plate 3 is axially fixed and restrained. In addition, since the copper ring 10 and the stator support plate 3 are matched with the hollow core shaft 17 with equal diameter clearance, the position 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, and then the curved hollow core The shaft 17 is corrected here. At the same time, the parts inside the coupling 1 can move radially with the hollow mandrel 17 in a small range, so as to avoid transmitting the torque of the hollow mandrel 17 to the rear parts.

It should also be noted that, in addition to setting the copper ring 10 and the hollow mandrel 17, the stator support plate 3 and the hollow mandrel 17 as a clearance fit, diamond coating can also be used instead, so that the hollow mandrel 17 is relatively The rotation of the coupling 1 is smoother.

Preferably, the inner circumference of the copper ring 10 is provided with a plating layer to improve the wear resistance and service life of the copper ring 10 .

Preferably, the inner peripheral portion of the coupling 1 is provided with a first inner rectangular spline 11, and the outer peripheral portion of the stator support plate 3 is provided with a first outer rectangular spline 12 that 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.

It should be noted that the first outer rectangular splines 12 of the stator support plate 3 are engaged with the first inner rectangular splines 11 of the coupling 1, or the coupling 1 and the stator supporting plate 3 are connected by fixing pins and screw diameters. The connection effect of the coupling 1 and the stator support plate 3 can be ensured, and the coupling 1 and the housing 2 can also be threadedly connected, so that the connection and assembly of the device is reliable, which is very suitable for small diameter The internal and external multi-layer parts of the core drilling tool are matched, resulting in a small installation space.

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, the stator connecting piece 4 is provided with a through slot 25, and the outer spherical arc surface is provided with 13 can pass through the through groove 25 and abut against the inner spherical arc surface 14 in a clearance fit. Among them, the stator support plate 3 and the stator assembly 5 are spherically matched, so that the components in the coupling 1 can be adjusted in small floating along with the hollow core shaft 17, so as to avoid transmitting the torque of the hollow core shaft 17 to the rear parts. .

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 central rectangular spline 26, and the second inner rectangular spline Both the key 15 and the second outer rectangular spline 16 are engaged with the central rectangular spline 26 to ensure the radial fixation of the stator support plate 3 , the stator connecting piece 4 and the stator assembly 5 .

It should be noted that due to the long length of the hollow mandrel 17, the radius of curvature of the directional drilling track of the directional coring tool will be large. In order to avoid correcting the hollow mandrel 17 at the copper ring 10, Therefore, the outer spherical arc surface 13 of the stator support plate 3 is gap-fitted with the inner spherical arc surface 14 of the stator assembly 5, and the second inner rectangular spline 15 of the stator support plate 3 and the second outer rectangular splines 16 of the stator assembly 5 are elastically matched with the central rectangular splines 26 of the stator connector 4 to ensure that the stator support plate 3 and the stator assembly 5 are oriented and fixedly connected, and can also be achieved here. The radial movement of the corresponding component with a small arc and small float is allowed as the hollow mandrel 17 is bent.

It should also be noted that by adopting rectangular spline fitting, spherical fitting, etc., the purpose of not rotating the stator structure part of the drill rig bearing assembly and rotating the rotor structure part can be achieved, and this assembly method is simple in structure, convenient in assembly, and very convenient. It is suitable for the environment with a small circular space.

Preferably, the inner peripheral portion of the coupling 1 , the inner peripheral portion of the stator support plate 3 , the inner peripheral portion of the stator connector 4 , the inner peripheral portion of the stator assembly 5 , the inner peripheral portion of the rotor assembly 6 and the inner peripheral portion of the drive shaft 7 Coatings are provided on the inner circumference to improve the wear resistance and service life of each component.

Preferably, the casing 2 is provided with a through hole along the circumferential direction, and the through hole communicates with the flow channel of the hollow mandrel 17 to form a cooling and lubricating flow channel.

It should be noted that the stator assembly 5 is used in conjunction with the rotor assembly 6, and the two are installed inside the housing 2. The through holes, the stator assembly 5 and the rotor assembly 6 can form a cooling flow channel together with the flow channel of the hollow mandrel 17 to form a cooling flow channel. An environment that provides cooling and lubrication to the bearing assembly. Since the device adopts drilling fluid for cooling and lubrication, it does not need a strict sealing system, which avoids the lack of space caused by the storage of lubricant or the fear of drilling fluid intrusion into the lubricant to affect the lubrication effect. In addition, the stator assembly 5 and the rotor assembly 6 can be arranged in a blade structure to replace the small hole flow cooling, thereby providing a better lubricating and cooling environment for the bearing assembly.

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

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, and the bearing can work normally in a mud environment, so that the device It can be cooled and lubricated with drilling fluid without complex sealing systems. That is to say, the cooling and lubricating requirements of the bearing assembly can be met by simply matching the flow passages to the casing 2, the stator assembly 5, the rotor assembly 6 and the hollow mandrel 17. The bearing assembly is suitable for applications where the radial space is insufficient. use in case.

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 embodiments. The housing 18, the hollow mandrel 17 and the housing 18 are sequentially provided with a fulcrum bearing assembly 19, an offset assembly 20 and a cantilever bearing assembly 21 from bottom to top; the lower end of the fulcrum bearing assembly 19 is connected to the drill bit 23, and the The upper end is hinged to the hollow mandrel 17, the lower end of the cantilever bearing assembly 21 is fixedly connected to the hollow mandrel 17, 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 mandrel 17, and the shell The outer periphery of 18 is provided with an openable and closable packer assembly 24, the openable packer assembly 24 can clamp the housing 18 in the hole wall, and the cantilever bearing assembly 21 is any one of the above drilling rig bearing assemblies. For the structures of other parts of the directional coring tool, please refer to the prior art, which will not be repeated herein.

It should be noted that the biasing assembly 20 is used to adjust the eccentricity of the hollow mandrel 17, which may mean that the biasing assembly 20 has a three-layer casing structure, and the innermost casing and the hollow mandrel 17 are connected with equal diameters. The outermost two layers of casings are distributed in inner and outer eccentric circles. By adjusting the position of the second layer of casings, the innermost casings can be eccentrically swung, so that the hollow core shaft 17 can bend and change in displacement in any direction, thereby adjusting the hollowness. Eccentricity of the mandrel 17 . When the directional coring tool performs the linear drilling operation, the hollow mandrel 17 does not bend and deform, and the structure is shown in FIG. 6 , and when the directional coring tool needs to perform the directional drilling operation, the offset assembly 20 can be used to make the hollow shaft 17 hollow. The mandrel 17 is bent and deformed, and the structure is shown in FIG. 7 .

It should also be noted that the fulcrum bearing assembly 19 is hinged with the hollow mandrel 17 , therefore, 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 transmit the bending of the hollow mandrel 17 to the drill bit 23, so that the drill bit 23 produces a lateral inclination angle. The cantilever bearing assembly 21 is fixedly connected with the hollow mandrel 17 , so the cantilever bearing assembly 21 does not transmit the bending deformation of the hollow mandrel 17 to the drill rod 22 , so that the hollow mandrel 17 can be straightened at the cantilever bearing assembly 21 . After the packer assembly 24 is opened, the hole wall can be clamped to lock the casing 18 in the hole wall, thereby preventing the casing 18 from rotating, while the hollow mandrel 17 and the drill bit 23 can be rotated to adjust the inclination angle of the drill bit 23 .

In addition, it should be noted that when the directional coring tool is used, the drilling fluid can flow in from the inside of the drill pipe 22, pass through the hollow mandrel 17 and the fulcrum bearing assembly 19, flow out at the drill bit 23, reach the bottom of the hole and return, and then , the drilling fluid can flow out between the casing 18 of the directional coring tool and the hole wall, and the packer assembly 24 can expand and jam the hole wall under the pressure of the drilling fluid. Then, the whole machine can transmit the torque to the drill rod 22 , the drill rod 22 transmits the torque to the hollow mandrel 17 , and then transmits the torque to the drill bit 23 through the inner drive shaft 7 of the fulcrum bearing assembly 19 . The cantilever bearing assembly 21 , the offset assembly 20 , the fulcrum bearing assembly 19 , and the housing 2 are successively screwed together to form an integral structure. Only the hollow mandrel 17 rotates, so as to realize the rotary cutting function of the directional coring tool.

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 Two outer rectangular splines 16, wherein the first and the second are only to distinguish the difference of the position, and there is no order of precedence.

The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments, and the same and similar parts between the various embodiments can be referred to each other. Any combination of all the embodiments provided by the present invention falls within the protection scope of the present invention, and is not repeated here.

The directional coring tool and its drilling rig bearing assembly provided by the present invention have been described in detail above. The principles and implementations of the present invention are described herein by using specific examples, and the descriptions of the above embodiments are only used to help understand the method and the core idea of the present invention. It should be pointed out that for those skilled in the art, without departing from the principle of the present invention, several improvements and modifications can also be made to the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims (10)

1. A drilling rig bearing assembly, characterized in that it comprises: a coupling (1), a housing (2), a stator support plate (3), a stator connecting piece (4), a stator assembly (5), a rotor assembly ( 6) and the 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 annular structures, and are sequentially sleeved on the outer periphery of the hollow core shaft (17), the inner circumference of the coupling (1) and the hollow core shaft (17) ) clearance fit on the outer periphery; The stator support plate (3) is arranged on the inner peripheral portion of the coupling (1), and both the stator support plate (3) and the stator assembly (5) are connected to the stator connection member (4) In the direction of clearance fit, the rotor assembly (6) is fitted and abutted with the stator assembly (5), and the drive shaft (7) is provided on the inner circumference of the rotor assembly (6) and the hollow core shaft ( 17), the casing (2) is sleeved on the outer circumference of the rotor assembly (6), and the casing (2) is connected with the coupling (1). 2. The drilling rig bearing assembly according to claim 1, wherein 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 form a cavity for axially fixing the copper ring (10), the inner circumference of the copper ring (10) and all The outer peripheral portion of the hollow mandrel (17) is loosely fitted. 3. The drilling rig bearing assembly according to claim 2, characterized in that, the inner peripheral portion of the copper ring (10) is provided with a plating layer. 4. The drilling rig bearing assembly according to claim 1, wherein a first inner rectangular spline (11) is provided on the inner periphery of the coupling (1), and the stator support plate (3) is provided with a first inner rectangular spline (11). The outer peripheral portion is provided with a first outer rectangular spline (12) that is mated 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. The drilling rig bearing assembly according to claim 1, characterized in that, one end of the stator support plate (3) is provided with an outer spherical arc surface (13), and the stator assembly (5) is provided with an inner spherical arc surface (14), the stator connector (4) is provided with a through slot (25), and the outer spherical arc surface (13) can pass through the gap between the through slot (25) and the inner spherical arc surface (14) Match up. 6. The drilling rig bearing assembly according to claim 5, wherein the inner spherical arc surface (14) is provided with a second inner rectangular spline (15), and the outer spherical arc surface (13) is provided with a second inner rectangular spline (15). Two outer rectangular splines (16), the stator connector (4) is provided with a central rectangular spline (26), the second inner rectangular splines (15) and the second outer rectangular splines (16) All of them are engaged with the rectangular splines (26) in the middle. 7. The drilling rig bearing assembly according to any one of claims 1 to 6, wherein the inner peripheral portion of the coupling (1), the inner peripheral portion of the stator support plate (3), the The inner peripheral portion of the stator connector (4), the inner peripheral portion of the stator assembly (5), the inner peripheral portion of the rotor assembly (6), and the inner peripheral portion of the drive shaft (7) are all provided with plating layers . 8. The drilling rig bearing assembly according to any one of claims 1 to 6, wherein the housing (2) is provided with a through hole in the circumferential direction, and the flow between the through hole and the hollow core shaft (17) The channels are connected to form cooling and lubricating flow channels. 9. The drilling rig bearing assembly according to any one of claims 1 to 6, wherein the stator assembly (5) and the rotor assembly (6) can constitute a plane thrust bearing or a spherical bearing. 10. A directional coring tool, characterized by comprising: a hollow mandrel (17) and a casing (18) sleeved on the outer periphery of the hollow mandrel (17), the hollow mandrel (17) A fulcrum bearing assembly (19), an offset assembly (20) and a cantilever bearing assembly (21) are arranged in sequence from bottom to top between the casing (18); The lower end of the fulcrum bearing assembly (19) is connected with the drill bit (23), the upper end of the fulcrum bearing assembly (19) is hinged with the hollow core shaft (17), and the lower end of the cantilever bearing assembly (21) is connected to the The hollow mandrel (17) is fixedly connected, the upper end of the cantilever bearing assembly (21) is connected with the drill pipe (22), and the offset assembly (20) is used to adjust the eccentricity of the hollow mandrel (17). The outer periphery of the casing (18) is provided with an openable and closable packer assembly (24), and the open packer assembly (24) can clamp the casing (18) in the hole wall, so The cantilever bearing assembly (21) is the drilling rig bearing assembly according to any one of the above claims 1-9.

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