A bottom-hung composite through-hole turbodrill

Abstract

The present invention discloses a bottom-hanging composite through-type turbine drill, which relates to the field of geological exploration technology, including a power assembly and a bottom-hanging transmission assembly. In the power assembly, the inner ring of the upper straightening TC bearing and the through-type central shaft are connected by threads to press the full-through drive shaft system components, and the upper splitter joint is connected to the outer ring of the upper straightening TC bearing and the shell coupling to press the shell system components into the shell. Similarly, in the bottom-hanging transmission assembly, the hollow spline shaft and the through-type double-walled drive shaft are connected by threads to press the full-through bottom-hanging transmission shaft system components onto the through-type double-walled drive shaft step, and the lower shell short-circuit, the stop washer and the lower short-circuit together press the lower shell washer, the lower straightening TC bearing outer ring, the arc raceway ball bearing outer ring, etc. into the lower shell, and are connected to the shell system components in the power assembly to jointly suspend all the shaft system components. The present invention not only realizes the full penetration of the turbine drill from top to bottom, but also can be expanded to connect other hollow tools or instruments.

Description

Technical Field

[0001] The present invention relates to the technical field of geological exploration, and particularly to a bottom-hung composite through-flow turbodrill. Background Art

[0002] In the processes of oil and gas resource exploration, scientific drilling, new energy exploration and development, etc., a compound driving mode of a downhole rotary power drill combined with a rig rotary table is usually adopted to improve the mechanical drilling rate of the well. Among them, the turbodrill, as an effective downhole rotary power drill, is often used to overcome problems such as high temperature, high pressure, and slow drilling speed in hard rock in the well, and becomes a key technical means for improving the speed and efficiency in high-temperature hard rock formations during drilling operations. However, due to the characteristics that the central shaft of a conventional turbodrill is solid or non-through structure, it is difficult to realize functions such as wireline coring, logging while tripping, and connecting with other hollow instruments and tools, resulting in limited working condition adaptability. Summary of the Invention

[0003] The purpose of the present invention is to provide a bottom-hung composite through-flow turbodrill to solve the problems existing in the above-mentioned prior art, to realize the up-and-down through-flow function of the turbodrill, to meet the working conditions of core drilling, logging while tripping, and hanging hollow instruments or tools, and to use a bottom-hung internal transmission shaft to achieve bottomhole drive near the bit to improve mechanical efficiency.

[0004] To achieve the above purpose, the present invention provides the following solution:

[0005] The present invention provides a bottom-hung composite through-hole turbodrill, which includes a flow-dividing upper sub. The flow-dividing upper sub is a through-hole stepped pipe body structure. The upper and lower stepped surfaces on the outer surface of the flow-dividing upper sub are respectively used for threaded connection with the upper shell nipple and the outer ring of the upper centralizing TC bearing. The middle stepped surface between the upper and lower stepped surfaces of the flow-dividing upper sub is circumferentially provided with oblong through-holes; a hanging seat sealing ring is fixedly arranged on the inner step at the bottom of the flow-dividing upper sub, and the hanging seat sealing ring is provided with an inner conical surface; the axial cross-section of the outer ring of the upper centralizing TC bearing is a through-hole "T" shape. Along the axis direction, evenly distributed arc-shaped through-holes are formed on the outer wall of the large end outer circle and the small end outer circle of the outer ring of the upper centralizing TC bearing. The inner circumferential surface of the small end outer circle of the outer ring of the upper centralizing TC bearing is in clearance fit with the outer circumferential surface of the small end outer circle of the inner ring of the upper centralizing TC bearing. The inner circumferential surface of the large end outer circle of the inner ring of the upper centralizing TC bearing is threadedly connected with a through-hole central shaft; the bottom of the upper shell nipple is threadedly connected with a shell middle collar; the lower end of the shell middle collar is threadedly connected with a shell body; the top end of the through-hole central shaft is fixedly installed with a semi-coupling clip through a circlip. The semi-coupling clip is a semi-cylindrical tile structure, and circlip grooves are processed at both ends. A square groove is processed in the middle of the outer circumference of the semi-coupling clip; a key protrusion capable of being keyed with the key groove at the top end of the through-hole central shaft is processed in the middle of the inner circumferential surface of the semi-coupling clip; a shell system component is installed inside the shell body; a shaft system component is fixedly installed on the outer circumference of the through-hole central shaft, and the shaft system component and the shell system component can rotate relatively; the through-hole central shaft is a fully through-hole stepped shaft, the key groove of the through-hole central shaft is located at the small end of the through-hole central shaft, and a hollow spline sleeve is threadedly connected to the large end of the through-hole central shaft; the hollow spline sleeve is in the shape of a hollow pipe body, a hollow spline shaft in the shape of a hollow pipe body is inserted at the bottom of the hollow spline sleeve, and a through-hole double-wall transmission shaft is threadedly connected to the bottom of the hollow spline shaft; a shell lower collar is threadedly connected to the lower end of the shell body, a lower shell nipple is threadedly connected to the bottom of the shell lower collar, and a lower shell body is threadedly connected to the bottom of the lower shell nipple; a lower shaft system component is fixedly connected to the outer circumferential surface of the through-hole double-wall transmission shaft; a lower shell system component is fixedly installed inside the lower shell body, and the lower shaft system component and the lower shell system component can rotate relatively; the lower shaft system component includes a flow-dividing sleeve, the axial cross-section of the flow-dividing sleeve is a "T" shape, and four arc-shaped inclined holes are circumferentially evenly distributed at the conical surface position where the small diameter and the large diameter transition, and the angle with the axis is 45°;The through-type double-wall transmission shaft is a fully-through stepped shaft. The outermost end of the small end of the through-type double-wall transmission shaft is machined with connecting threads for connecting with the hollow spline shaft. Flat passages are evenly distributed on the outer circumference of the small end of the through-type double-wall transmission shaft away from the connecting threads. There are two levels of steps machined between the small end and the large end of the through-type double-wall transmission shaft. The diameter change of the first-level step adopts a 30° inclination angle, and the diameter change of the second-level step adopts a 90° right angle. Circular through-holes evenly distributed in a circle are drilled on the inclined plane of the diameter change of the first-level step along the axial direction to form the main flow channel of the drilling fluid. At the same time, one end of the large end of the through-type double-wall transmission shaft away from the small end of the through-type double-wall transmission shaft is machined with an inner wall and an outer wall. The outer wall of the large end of the through-type double-wall transmission shaft is machined with internal threads, and the inner wall is machined with external threads.;

[0006] Optionally, the outer ring of the upper centralizing TC bearing is machined with internal threads on the inner surface of the outer circle at the small end, and cemented carbide is inlaid on the remaining inner surface after machining the internal threads on the outer circle at the small end of the outer ring of the upper centralizing TC bearing; cemented carbide is inlaid on the outer surface of the outer circle at the small end of the inner ring of the upper centralizing TC bearing, and the cemented carbide outer circumferential surface formed by the outer circle at the small end of the inner ring of the upper centralizing TC bearing is in clearance fit with the cemented carbide inner circumferential surface of the outer circle at the small end of the outer ring of the upper centralizing TC bearing.

[0007] Optionally, the housing system components include an upper housing gasket, an outer ring of the middle centralizing TC bearing, a stator, and a housing gasket installed inside the housing; the shaft system components include an upper shaft gasket, an inner ring of the middle centralizing TC bearing, a rotor, and a shaft sleeve sleeved on the outer circumference of the through central shaft.

[0008] Optionally, there are multiple rotors, and multiple rotors are respectively sleeved on the through central shaft. After the drilling fluid flows through, it can drive the through central shaft to rotate circumferentially to form a driving force; there are multiple stators, and multiple stators are fixed in the housing and remain stationary with the housing after the drilling fluid flows through.

[0009] Optionally, the lower shaft system components include a lower shaft gasket, a flow splitting sleeve, an inner ring of the lower centralizing TC bearing, an inner ring of the circular arc raceway ball bearing, a thin-walled inner shell, and a lower seat sealing shaft sleeve sleeved on the outer circumferential surface of the through-type double-wall transmission shaft and pressed by the hollow spline shaft; the lower housing system components include a lower housing gasket, an outer ring of the lower centralizing TC bearing, and an outer ring of the circular arc raceway ball bearing installed in the lower housing and pressed at both ends by the lower housing stub, a stop washer, and a lower stub.

[0010] Optionally, the axial section of the flow splitting sleeve is a "T" - shaped structure, and four circular arc inclined holes are evenly distributed in a circle at the conical surface position where the small diameter and the large diameter of the flow splitting sleeve transition, and the angle with the axis is 45°.

[0011] Optionally, the lower centralizing TC bearing inner ring is cylindrical, and hard alloy is inlaid on the outer cylindrical surface of the lower centralizing TC bearing inner ring. Three protruding key blocks are circumferentially distributed on the inner hole of the lower centralizing TC bearing inner ring, and the key blocks are closely attached to the outer wall of the small end of the through-type double-wall transmission shaft.

[0012] Optionally, the outer wall of the large end of the through-type double-wall transmission shaft can be connected to the shell of a drill bit or other hollow instrument, and the inner wall of the large end of the through-type double-wall transmission shaft can be connected to the hollow inner tube of the hollow instrument.

[0013] Further preferably, the bottom-hung composite through-type turbodrill disclosed in the present invention includes a power assembly and a bottom-hung transmission assembly. The power assembly includes a flow-dividing upper sub, a suspension seat seal ring, an upper centralizing TC bearing outer ring, an upper shell nipple, an upper centralizing TC bearing inner ring, a shell middle collar, a snap ring, a semi-split clamp, an upper shaft washer, an upper shell washer, a middle centralizing TC bearing inner ring, a middle centralizing TC bearing outer ring, a housing, a rotor, a stator, a shaft sleeve, a shell washer, a through center shaft, a shell lower collar, a hollow spline sleeve, etc. The bottom-hung transmission assembly includes a lower shell nipple, a hollow spline shaft, an O-ring, a lower shaft washer, a flow-dividing sleeve, a lower shell washer, a lower centralizing TC bearing inner ring, a lower centralizing TC bearing outer ring, an inner ring of an arc-raceway ball bearing, an outer ring of an arc-raceway ball bearing, a thin-walled inner shell, a lower housing, a lower seat seal shaft sleeve, a retaining washer, a lower nipple, a through-type double-wall transmission shaft, etc. In the power assembly, the upper centralizing TC bearing inner ring and the through center shaft are threadedly connected to press and connect components such as the semi-split clamp, the upper shaft washer, the middle centralizing bearing inner ring, the rotor, and the shaft sleeve strung on the through center shaft, and the hollow spline sleeve is connected to form a fully-through drive shaft system component. The flow-dividing upper sub is connected to the upper centralizing TC bearing outer ring and the shell middle collar, and then connected to the shell lower collar to press the upper shell washer, the middle centralizing TC bearing outer ring, the stator, the shell washer, etc. in the housing to form a shell system component connected to the drill pipe string. Similarly, in the bottom-hung transmission assembly, the hollow spline shaft and the through-type double-wall drive shaft are threadedly connected to press the lower shaft washer, the flow-dividing sleeve, the lower centralizing TC bearing inner ring, the inner ring of the arc-raceway ball bearing, the thin-walled inner shell, the lower seat seal shaft sleeve, etc. on the step of the through-type double-wall drive shaft to form a fully-through bottom-hung drive shaft system component. The lower shell nipple, the retaining washer and the lower nipple together press the lower shell washer, the lower centralizing TC bearing outer ring, the outer ring of the arc-raceway ball bearing, etc. in the lower housing to form a bottom-hung transmission shell component, which is connected to the shell system component in the power assembly to jointly suspend all components of the shaft system. The present invention not only realizes the full-through of the turbodrill from top to bottom, but also can be extended to connect other hollow tools or instruments.

[0014] The present invention has achieved the following technical effects compared with the prior art:

[0015] The bottom-hung composite through-hole turbodrill of the present invention uses a through-hole central shaft as the drive shaft. After being inserted into the hollow spline shaft through the hollow spline sleeve, it is connected to the through-hole double-wall drive shaft and bottom-hung on the lower housing, achieving the through-hole property of the turbodrill from top to bottom and solving the problem that existing turbodrills do not meet the requirement for the passing of in-hole tools or instruments. During downhole operation, the shell components of the through-hole turbodrill are connected and fixed to the drill pipe string, while the through-hole central shaft generates driving force when drilling fluid passes through the rotor, thereby driving the bottom through-hole double-wall drive shaft and the bit connected thereto to rotate at high speed for rock breaking. The bottom-hung shaft system components of the lower housing can balance the reaction force between the bit and the formation and reduce the frictional energy consumption of the shell-rotating turbodrill. By installing a suspension seat sealing ring seat in the drill tool diverter sub to hang and insert the in-hole tool, and the cooperation between the inner ring of the high-speed rotating upper centralizing TC bearing and the outer ring of the stationary upper centralizing TC bearing forms a static-dynamic combined double-sealing form, effectively preventing the drilling fluid entering the drill tool annulus from leaking into the inner channel of the through-hole central shaft and realizing the independent replacement of the suspension seat sealing ring. At the same time, the combined use characteristics of the through-hole turbodrill are further improved. The use of the through-hole double-wall drive shaft not only meets the requirement for directly connecting the bit but also can be extended to connect the outer pipe and the hollow inner pipe of other types of hollow instruments or tools, realizing the composite multi-functional application in the drilling processes such as oil and gas resource exploration and scientific drilling. Brief Description of the Drawings

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0017] Figure 1 It is a schematic structural diagram of a composite bottom-hung through-hole turbodrill of the present invention;

[0018] Figure 2 It is a schematic structural diagram of the drill tool diverter sub of the present invention;

[0019] Figure 3 It is a schematic axonometric view of the outer ring of the upper centralizing TC bearing of the present invention;

[0020] Figure 4 It is a schematic axonometric view of the diverter sleeve of the present invention;

[0021] Figure 5 It is a schematic structural diagram of the through-hole double-wall drive shaft of the present invention;

[0022] Figure 6 It is a schematic sectional structural diagram of the through-hole double-wall drive shaft of the present invention at A-A;

[0023] Explanation of the reference numerals: 1. shunt upper joint, 1-1, oblong through hole, 2, suspension seat sealing ring, 3, upper TC bearing outer ring, 3-1, hard alloy, 4, upper shell short circuit, 5, upper TC bearing inner ring, 6, shell middle coupling, 7, retaining spring, 8, half-closed clamp, 9, upper shaft washer, 10, upper shell washer, 11, middle TC bearing inner ring, 12, middle TC bearing outer ring, 13, shell, 14, rotor, 15, stator, 16, bushing, 17, shell washer, 18, through center shaft, 19, shell lower coupling, 20, hollow spline sleeve, 21, lower shell short circuit, 22, hollow spline shaft, 23, first O-ring, 24, lower shaft gasket, 25, diverter sleeve, 26, lower shell gasket, 27, lower TC bearing inner ring, 27-1, key block, 28, lower TC bearing outer ring, 29, arc raceway ball bearing inner ring, 30, arc raceway ball bearing outer ring, 31, thin-walled inner shell, 32, lower shell, 33, second O-ring, 34, lower seat seal sleeve, 35, stop washer, 36, lower short circuit, 37, third O-ring, 38, through-type double-wall transmission shaft, 38-1, flat through, 38-2, circular through hole, 38-3, through-type double-wall transmission shaft outer wall, 38-4, through-type double-wall transmission shaft inner wall. DETAILED DESCRIPTION

[0024] 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.

[0025] The purpose of the present invention is to provide a bottom-hanging composite through-type turbodrill to solve the problems existing in the above-mentioned prior art, so as to realize the up and down through-function of the turbodrill, meet the use conditions of coring drilling, logging without lifting the drill bit, and hanging hollow instruments and equipment, and adopt a bottom-hanging internal transmission shaft to realize bottom hole drive near the drill bit position to improve mechanical efficiency.

[0026] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0027] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6As shown in the figure, the present invention provides a bottom-hung composite through-hole turbodrill, which includes a power assembly and a bottom-hung transmission assembly. The power assembly includes a flow-dividing upper joint 1, a suspension seat sealing ring 2, an upper centralizing TC bearing outer ring 3, an upper shell nipple 4, an upper centralizing TC bearing inner ring 5, a shell middle coupling 6, a snap ring 7, a semi-circular snap ring 8, an upper shaft washer 9, an upper shell washer 10, a middle centralizing TC bearing inner ring 11, a middle centralizing TC bearing outer ring 12, a housing 13, a rotor 14, a stator 15, a shaft sleeve 16, a shell washer 17, a through-hole central shaft 18, a shell lower coupling 19, a hollow spline sleeve 20, etc. The bottom-hung transmission assembly consists of a lower shell nipple 21, a hollow spline shaft 22, a first O-ring 23, a second O-ring 33, a third O-ring 37, a lower shaft washer 24, a flow-dividing sleeve 25, a lower shell washer 26, a lower centralizing TC bearing inner ring 27, a lower centralizing TC bearing outer ring 28, an arc-race ball bearing inner ring 29, an arc-race ball bearing outer ring 30, a thin-walled inner shell 31, a lower housing 32, a lower seat-sealing shaft sleeve 34, a lock washer 35, a lower nipple 36, a through-type double-wall transmission shaft 38, etc. The first O-ring 23, the second O-ring 33, and the third O-ring 37 play a sealing role. Specifically, the flow-dividing upper joint 1 is a through-type stepped pipe body. Threads are processed on the upper and lower stepped surfaces of the stepped outer surface for connecting with the upper shell nipple 4 and the upper centralizing TC bearing outer ring 3 respectively. Four oblong through-holes 1-1 are evenly distributed on the circumferences of another stepped surface of the flow-dividing upper joint 1. The stepped surface with the oblong through-holes 1-1 is located between the two stepped surfaces processed with threads. The suspension seat sealing ring 2 is processed with an inner conical surface, forms a sealing pair through the cooperation of the inner conical surface and plays a supporting role. The suspension seat sealing ring 2 is directly seated and hung on the inner step of the flow-dividing upper joint 1. The upper centralizing TC bearing outer ring 3 is a through-type "T" shape. Internal threads are processed on the inner surface of the small end, and small-particle cuboid-shaped cemented carbides 3-1 are inlaid on the remaining inner surface. Four evenly distributed arc-shaped through-holes are processed along the axial direction on the outer wall of the large end in fit with the small end for the circulation of drilling fluid. The upper shell nipple 4 connects the flow-dividing upper joint 1 and the shell middle coupling 6 through threads. The upper centralizing TC bearing inner ring 5 is a hollow pipe body. Small-particle cuboid-shaped cemented carbides are inlaid on the outer circular surface of the small end. The formed outer circumferential surface of the cemented carbide is in clearance fit with the inner circumferential surface of the cemented carbide of the upper centralizing TC bearing outer ring 3. Internal threads are processed on the large end to connect the through-hole central shaft 18. The shell middle coupling 6 is a pipe body with threads processed at both ends, and the lower end is connected to the housing 13. The semi-circular snap ring 8 is a semi-cylindrical tile. Snap ring grooves are processed at both ends. A square groove is processed in the middle of the outer circumference for clamping. A key protrusion is processed in the middle of the inner circumferential surface to cooperate with the key groove at the top of the through-hole central shaft 18. Two semi-circular snap rings 8 are fixedly installed on the through-hole central shaft 18 through the snap ring 7 to provide a clamping position. The upper shell washer 10, the middle centralizing TC bearing outer ring 12, the stator 15, and the shell washer 17 are all installed inside the housing 13 to form a shell system component. The upper shaft washer 9, the middle centralizing TC bearing inner ring 11, the rotor 14, and the shaft sleeve 16 are all sleeved on the outer circumference of the through-hole central shaft 18 to form a shaft system component.The rotor 14 has multiple components that are also sleeved on the through central shaft. After the drilling fluid flows through, it drives the through central shaft to rotate circumferentially, forming a driving force. The stator 15 has multiple components that are all fixed in the housing and remain stationary with the housing after the drilling fluid flows through. The through central shaft 18 is a fully through stepped shaft. The top of the small end part is processed with threads and two symmetrically distributed square key grooves are processed not far from the root of the threads. The large end is processed with threads and is connected to the hollow spline sleeve 20. The hollow spline sleeve 20 is in the shape of a hollow tube. The inner hole of one end is processed with threads, and the inner hole of the other end is processed with internal splines. After connecting the through central shaft 18, it can transmit torque. The lower housing nipple 21 is a tube with equal wall thickness. One end is processed with internal threads and is connected to the lower housing collar 19 of the power assembly. One end is processed with external threads and is connected to the lower housing 32 of the bottom-hung transmission assembly, realizing the fastening of the power assembly and the bottom-hung transmission assembly. The hollow spline shaft 22 is in the shape of a hollow tube. The outer circumferential surface of one end is processed with external splines and is inserted into the hollow spline sleeve 20 and directly seats and hangs on the through central shaft shafting components of the power assembly. The inner hole of the other end is processed with internal threads and is connected to the through-type double-wall transmission shaft 38. The lower shaft washer 24, the flow-dividing sleeve 25, the inner ring 27 of the lower centralizing TC bearing, the inner ring 29 of the circular arc raceway ball bearing, the thin-walled inner housing 31, the lower seat sealing shaft sleeve 34, etc. are sleeved on the outer circumferential surface of the through-type double-wall transmission shaft 38 and are pressed by the hollow spline shaft 22 to form the lower shafting components that rotate with the through-type double-wall transmission shaft 38. The lower housing washer 26, the outer ring 28 of the lower centralizing TC bearing, the outer ring 30 of the circular arc raceway ball bearing, etc. are all installed in the lower housing 32 and are pressed at both ends by the lower housing nipple 21, the lock washer 35 and the lower nipple 36 and do not rotate. The flow-dividing sleeve 25 is a "T"-type shaft sleeve. Four circular arc-shaped inclined holes are evenly distributed in the circumferential direction at the tapered surface where the small diameter and the large diameter transition, and the angle with the axis is 45°. Through the flow-dividing sleeve 25, a small amount of the drilling fluid is shunted to lubricate the circular arc raceway ball bearing. The inner ring 27 of the lower centralizing TC bearing is in the shape of a cylinder. The entire outer surface of the cylinder is inlaid with small particle cuboid-shaped cemented carbide to form a wear-resistant alloy surface. Three protruding key blocks 27-1 are distributed in the inner hole circumference. The key blocks closely fit the outer wall of the through-type double-wall transmission shaft 38 to play a role of radial centralizing and supporting. The inner wall of the outer ring 28 of the lower centralizing TC bearing is inlaid with small particle cuboid-shaped cemented carbide to form a wear-resistant alloy surface. At the same time, six semi-circular grooves are processed on the inner hole wall along the axial direction to allow a little drilling fluid to flow through. The inner ring 27 of the lower centralizing TC bearing and the outer ring 28 of the lower centralizing TC bearing adopt an interference fit. The inner ring 29 of the circular arc raceway ball bearing and the outer ring 30 of the circular arc raceway ball bearing are axially pressed to jointly bear the acting force of the entire drill string shafting components through the thin-walled inner housing 31 to play a hanging role. The lower seat sealing shaft sleeve 34 is directly seated on the shoulder of the through-type double-wall transmission shaft. At the same time, sealing grooves are processed on the end face of the small end and the inner hole face of the large end, and O-ring seals are respectively installed to prevent the drilling fluid from leaking. The lock washer 35 is a lock washer with a helical tooth processed on one end face and a flat face on the other end face to prevent the lower nipple 36 from loosening and tripping.The through-type double-wall transmission shaft 38 is a fully through-type stepped shaft. The small end is processed with a connecting thread, and then a large diameter section is processed with four flat holes 38-1 evenly distributed on the outer circumference. Two steps are processed to the large end. The first step is reduced in diameter at a 30° inclination, and the second step is reduced in diameter at a 90° right angle. 12 circular through holes 38-2 evenly distributed on the 30° diameter reduction slope are drilled along the axis direction to form a main flow channel for drilling fluid. At the same time, the large end is processed with double walls, and the outer wall 38-3 of the through-type double-wall transmission shaft is processed with internal threads, and the inner wall 38-4 of the through-type double-wall transmission shaft is processed with external threads. The outer wall 38-3 of the through-type double-wall transmission shaft can be connected to the outer shell of a drill bit or other hollow tools, and the inner wall 38-4 of the through-type double-wall transmission shaft is connected to the hollow inner tube of the hollow tool to realize the composite multifunctional use of drilling tools. ;

[0028] The working process of the present invention is as follows: during the drilling process, the drill pipe column is connected to the bottom-hanging composite through-type turbine drill and sent to the bottom of the well. After the required internally-thrown tools or instruments are put into the channel in the drill pipe column, they are hung on the inner conical surface of the suspension seat seal ring 2 to form the first static seal pair. At this time, the flow channel of the drilling fluid changes and passes through the diversion hole of the diversion upper joint 1, that is, the oblong through hole 1-1, into the annulus formed by the shell 13 and the through-center shaft 18. The hydraulic energy of the drilling fluid in the drill tool annulus is converted by the rotor 14 and the stator 15 to generate mechanical energy, so that the rotor 14 drives the through-center shaft 18 to rotate at a high speed to form a downhole driving force, and the upper straightening TC bearing outer ring 3 and the upper straightening TC bearing inner ring 5 move at a relatively high speed to form a second dynamic seal. In this process, the outer shell of the through-center turbine drill is fixedly connected with the drill pipe column and does not rotate, so that there is no friction with the well wall to reduce energy loss. The through center shaft 18 is connected to the through double-wall transmission shaft 38 through the hollow spline sleeve 20 and the hollow spline shaft 22, and then drives the drill bit connected to the outer wall 38-3 of the through double-wall transmission shaft to break rocks. After the drop-in device hung in the bottom-hanging composite through turbine drilling tool is lifted out by rope, the well logging without lifting the drill can be realized. At the same time, the outer wall 38-3 of the through double-wall transmission shaft and the inner wall 38-4 of the through double-wall transmission shaft are respectively connected to other forms of hollow drilling tool shells and hollow pipes to realize the compound combination drilling function.

[0029] In the description of the present invention, it should be noted that the terms "center", "top", "bottom", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0030] In the present invention, specific examples are used to illustrate the principle and implementation manner of the present invention. The description of the above embodiments is only used to help understand the method and its core idea of the present invention; at the same time, for those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present invention.

Claims

1. A bottom-hung composite through-hole turbodrill, characterized in that: Including a shunt upper joint, the shunt upper joint is a through stepped tube structure. The upper and lower stepped surfaces on the outer surface of the shunt upper joint are respectively used for threaded connection with the upper shell stub and the outer ring of the upper centralizer TC bearing. The middle stepped surface between the upper and lower stepped surfaces of the shunt upper joint is evenly distributed with oblong through holes in the circumferential direction; an inner stepped surface at the bottom of the shunt upper joint is fixedly provided with a suspension seat seal ring, and the suspension seat seal ring is provided with an inner conical surface; the axial section of the outer ring of the upper centralizer TC bearing is a through "T" shape. Along the axial direction, evenly distributed arc-shaped through holes are opened on the outer circumference of the large end of the outer ring of the upper centralizer TC bearing in contact with the outer wall of the small end. The inner circumferential surface of the small end of the outer ring of the upper centralizer TC bearing has a clearance fit with the outer circumferential surface of the small end of the outer ring of the inner ring of the upper centralizer TC bearing. The inner circumferential surface of the large end of the outer ring of the inner ring of the upper centralizer TC bearing is threadedly connected with a through central shaft; the bottom of the upper shell stub is threadedly connected with a shell middle collar; the lower end of the shell middle collar is threadedly connected with a shell body; the top end of the through central shaft is fixedly installed with a semi-coupling clamp through a snap ring. The semi-coupling clamp is a semi-cylindrical tile structure, with snap ring grooves processed at both ends. A square groove is processed in the middle of the outer circumference of the semi-coupling clamp; a key protrusion capable of being keyed with the key groove at the top end of the through central shaft is processed in the middle of the inner circumferential surface of the semi-coupling clamp; a shell system component is installed inside the shell body; an axis system component is fixedly installed on the outer circumference of the through central shaft, and the axis system component and the shell system component can rotate relative to each other; the through central shaft is a fully through stepped shaft, the key groove of the through central shaft is located at the small end of the through central shaft, and a hollow spline sleeve is threadedly connected to the large end of the through central shaft; the hollow spline sleeve is in the shape of a hollow tube body, and a hollow spline shaft in the shape of a hollow tube body is inserted at the bottom of the hollow spline sleeve. The bottom of the hollow spline shaft is threadedly connected with a through double-wall transmission shaft; the lower end of the shell body is threadedly connected with a shell lower collar, the bottom of the shell lower collar is threadedly connected with a lower shell stub, and the bottom of the lower shell stub is threadedly connected with a lower shell body; a lower axis system component is fixedly connected to the outer circumferential surface of the through double-wall transmission shaft; a lower shell system component is fixedly installed inside the lower shell body, and the lower axis system component and the lower shell system component can rotate relative to each other; the lower axis system component includes a shunt sleeve, the axial section of the shunt sleeve is "T" shaped, and four arc-shaped inclined holes are evenly distributed in the circumferential direction at the conical surface position where the small diameter and the large diameter transition, and the angle with the axis is 45°;The through-type double-wall transmission shaft is a fully through-type stepped shaft. At the outermost end of the small end of the through-type double-wall transmission shaft, a connecting thread for connecting with the hollow spline shaft is machined. On the outer circumference of the small end of the through-type double-wall transmission shaft, away from the connecting thread, flat passages are evenly distributed. Between the small end and the large end of the through-type double-wall transmission shaft, two levels of steps are machined. The diameter change of the first-level step adopts a 30° inclination angle, and the diameter change of the second-level step adopts a 90° right angle. Along the axial direction, circular through-holes evenly distributed in a circle are drilled on the inclined surface of the diameter change of the first-level step to form the main flow channel for drilling fluid. At the same time, at one end of the large end of the through-type double-wall transmission shaft, away from the small end of the through-type double-wall transmission shaft, an inner wall and an outer wall are machined. The outer wall of the large end of the through-type double-wall transmission shaft is machined with an internal thread, and the inner wall is machined with an external thread.

2. The bottom-hung compound through-hole turbodrill according to claim 1, wherein: The outer ring of the upper centralizing TC bearing is machined with an internal thread on the inner surface of the outer circle at the small end, and cemented carbide is inlaid on the remaining inner surface after machining the internal thread on the outer circle at the small end of the outer ring of the upper centralizing TC bearing; cemented carbide is inlaid on the outer surface of the outer circle at the small end of the inner ring of the upper centralizing TC bearing, and the cemented carbide outer circumferential surface formed by the outer circle at the small end of the inner ring of the upper centralizing TC bearing is in clearance fit with the cemented carbide inner circumferential surface of the outer circle at the small end of the outer ring of the upper centralizing TC bearing.

3. The bottom-hung compound through-hole turbodrill according to claim 1, characterized in that: The shell system components include an upper shell washer, a middle centralizing TC bearing outer ring, a stator, and a shell washer installed inside the shell; the shaft system components include an upper shaft washer, a middle centralizing TC bearing inner ring, a rotor, and a shaft sleeve sleeved on the outer circumference of the through central shaft.

4. The under-hung composite type through-tubing turbine drill tool according to claim 3, characterized in that: There are multiple rotors, and multiple rotors are respectively sleeved on the through central shaft. After the drilling fluid flows through, it can drive the through central shaft to rotate circumferentially to form a driving force; there are multiple stators, and multiple stators are fixed in the shell and remain stationary with the shell after the drilling fluid flows through.

5. The bottom-hung compound through-tubing turbodrill according to claim 1, wherein: The lower shaft system components include a lower shaft washer, a flow splitting sleeve, a lower centralizing TC bearing inner ring, an arc raceway ball bearing inner ring, a thin-walled inner shell, and a lower seat sealing shaft sleeve sleeved on the outer circumferential surface of the through double-wall transmission shaft and pressed by a hollow spline shaft; the lower shell system components include a lower shell washer, a lower centralizing TC bearing outer ring, and an arc raceway ball bearing outer ring installed in the lower shell and pressed at both ends by a lower shell stub, a stop washer, and a lower stub.

6. The bottom-hung compound through-hole turbodrill according to claim 5, wherein: The axial section of the flow splitting sleeve is a "T" - shaped structure, and four arc-shaped inclined holes are evenly distributed in a circumferential direction at the conical surface where the small diameter and the large diameter of the flow splitting sleeve transition, and the angle with the axis is 45°.

7. The bottom-hung composite through-hole turbodrill according to claim 5, wherein: The inner ring of the lower centralizing TC bearing is cylindrical, cemented carbide is inlaid on the cylindrical outer surface of the inner ring of the lower centralizing TC bearing, and three protruding key blocks are circumferentially distributed on the inner hole of the inner ring of the lower centralizing TC bearing, and the key blocks are closely attached to the outer wall of the small end of the through double-wall transmission shaft.

8. The bottom-hung composite through-hole turbodrill according to claim 1, characterized in that: The outer wall of the large end of the through double-wall transmission shaft can be connected to the outer shell of a drill bit or other hollow appliances, and the inner wall of the large end of the through double-wall transmission shaft can be connected to the hollow inner tube of the hollow appliance.

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