CN114135227B - A high-stability short-radius deflection drilling tool - Google Patents

Abstract

The invention discloses a high-stability short-radius deflection drilling tool, which includes a drill bit, a steering nipple and a self-resetting flexible drilling rod, wherein the tail end of the self-resetting flexible drilling rod is provided with a driving interface, and is driven The interface is driven by a rotary drive power unit to obtain rotary drilling power for short-radius rotary directional drilling. The front end of the self-resetting flexible drill pipe is fixedly connected to the rear end of the guide nipple, and the self-resetting flexible drill pipe can The drill pressure and torque are steerably transmitted to the guide sub-joint, and the front end of the guide sub-joint is fixedly provided with a drill bit. The device of the present invention can realize the rigid transmission of drilling pressure torque, and at the same time can easily realize highly flexible bending, and can make the steering tool guide with extremely low guiding force, so as to improve the development of thin layers and tap the potential of remaining oil by short-radius directional drilling technology , multi-layer oil and gas co-production, coal bed methane development and the engineering feasibility and practical value of the development of other types of minerals.

Description

A High Stability Short Radius Deflection Drilling Tool

technical field

The invention relates to the field of drilling and drilling, in particular to a high-stability short-radius deflection drilling tool.

Background technique

The short-radius directional drilling technology has engineering feasibility and practical value for the development of multi-layer oil and gas fields, the development of thin layers, the exploitation of remaining oil potential, the development of coalbed methane and the development of other types of minerals.

Some scholars believe that directional wells with a curvature radius of 30°-90°/30m should be defined as medium and short-radius directional wells, and directional wells with a curvature radius of 90°-300°/30m should be defined as short-radius directional wells. Directional wells with a radius greater than 300°/30m are defined as ultra-short radius directional wells.

At present, during the drilling process, it often happens that the curvature of the wellbore is too small, resulting in too long build-up section, and a large amount of invalid footage will be generated in the well section in the turning state, which leads to poor economic benefits and increases the operation difficulty of the construction section.

Contents of the invention

For this reason, the present invention proposes a high-stability short-radius deflection drilling tool to solve the problems raised in the above-mentioned background technology.

In order to achieve the above object, the present invention provides the following technical solutions: a high-stability short-radius deflection drilling tool, which includes a steering sub, a drill bit, a self-resetting flexible drill pipe, and at least one centralizer, wherein the self-resetting flexible The rear end of the drill pipe is provided with a drive interface, and through the drive interface, it is driven by a rotary drive power device or any drill string to obtain the rotary drilling power required for rotary drilling. It is characterized in that: the self-resetting flexible drill rod contains several An articulated transmission sub-joint, the front end of the self-resetting flexible drill rod is fixedly connected to the rear end of the guide sub-joint, and the self-resetting flexible drill rod can steerably transmit drilling pressure and torque to the guide sub-joint, The front end of the guide nipple is fixed with a drill bit, the centralizer is arranged outside the guide nipple and/or outside the self-resetting flexible drill pipe, and the distance between the centralizer and the front end of the drill bit is less than 3 meters.

Further, preferably, the self-resetting flexible drill rod includes at least one set of elastic recovery mechanisms and a plurality of articulated transmission sub-joints, each of which is fixed with at least one weight-on-bit torque deflection transmission mechanism, and The weight-on-bit torque deflection transmission mechanism has an input end and an output end, and the output end on one hinged transmission sub-joint is connected with the input end on the adjacent hinged transmission sub-joint. The articulated transmission nipple is provided with a through structure inside, which is used to form a flow channel for the drilling circulation medium to flow or to pass through a flow channel for the drilling circulation medium to flow.

Further, preferably, when the elastic recovery mechanism is a penetrating elastic tube or a penetrating elastic rod, a fulcrum structure is provided between each of the hinged transmission nipples and the elastic recovery mechanism, and the elastic recovery mechanism can Independently supported by the articulated transmission sub-joint;

Or, when the elastic recovery mechanism is an elastic member such as an elastic rod, an elastic plate or a spring, the self-resetting flexible drill rod includes several groups of elastic recovery mechanisms and several hinged transmission joints, and every two adjacent hinged joints A set of elastic recovery mechanism is provided in the deflection interval of the transmission sub-joint, one end of the elastic recovery mechanism is fixedly connected or coaxially connected with one of the two adjacent hinged transmission sub-joints, and the other end of the elastic recovery mechanism is connected with The other radial limit connection of the two adjacent hinged transmission sub-joints can enable the two adjacent hinged transmission sub-joints to generate a restoring force to restore the coaxial state when deflected;

The weight-on-bit torque deflection transmission mechanism may be a universal joint. It should be noted that in any of the articulated transmission nipples, one end connected to the direction of the drill bit is the output end, and the other end is the input end. The input end and the output end only indicate the transmission direction of the rotary drilling power, and are not specific to the specific structure. . The universal joint of the present invention is preferably a rigid universal joint, that is, a universal joint that can transmit rotational power at variable angles without generating bending moments.

The output end of the first articulated transmission sub-joint on the left is coaxially fixedly connected with the input end of the guide sub-joint. It is used to make full use of the elastic recovery mechanism to maintain the coaxial relationship between the guide sub-joint and several adjacent articulated transmission sub-joints.

Further, preferably, the length of each articulated transmission sub-joint is less than 1.5 meters, and the length of the self-resetting flexible drill rod is greater than 10 m; the limit deflection angle between every two adjacent articulated transmission sub-joints is less than 8°. When drilling a short-radius branch well, the axial length from the front end face of the drill bit to the rear end face of the self-resetting flexible drill rod is greater than the preset axial length of the drilled short-radius branch well.

Further, as a preference, the articulated transmission nipple (2) has a through structure (23) extending along its axial direction, and the through structure (23) is provided with a flow channel (28) for circulation of the drilling circulating medium. Drilling circulating medium; and/or, the elastic recovery mechanism (7) runs through the through-through structure (23) inside several hinged transmission nipples (2), and the elastic recovery mechanism (7) is connected to the hinge A fulcrum structure (4) is arranged between the transmission sub-joints (2), and the elastic recovery mechanism (7) can independently support each of the articulated transmission sub-joints (2) through the fulcrum structure (4), so that the The elastic recovery mechanism (7) can restore the coaxial state of the two adjacent hinged transmission short joints (2), and the elastic structure can be used as a flow channel for drilling circulation medium to flow.

Further, as a preference, a limit mechanism is provided on the articulated transmission sub-joint, and the limit mechanism can limit the deflection angle between adjacent articulated transmission sub-joints to 0°-5°.

Further, preferably, there are two or more fulcrum structures, wherein the section between the first fulcrum structure and the second fulcrum structure is set as a support segment, and the axial length of the support end is greater than 15mm.

Further, as a preference, the elastic recovery mechanism drives the input end of the weight-on-bit torque deflection transmission mechanism and the output end of the weight-on-bit torque deflection transmission mechanism to recover when the weight-on-bit torque deflection transmission mechanism deflects at any angle. The restoring force in the coaxial state can overcome the radial component force that drives the input end of the weight-on-bit torque deflection transmission mechanism and the output end of the weight-on-bit torque deflection transmission mechanism to further deflect under the rated weight-on-bit at this angle, so that the The input end of the weight-on-bit torque deflection transmission mechanism and the output end of the weight-on-bit torque deflection transmission mechanism have a tendency to return to the coaxial state. It is used to ensure that the bit weight is transmitted forward along the axis with the smallest curvature as much as possible.

Preferably, the restoring force generated by the elastic restoring mechanism is greater than 20000 sinαN.

Further, as a preference, a centralizer is provided on the outer wall of the guide sub, and a measurement and control circuit, a guide actuator and an electric actuator are arranged inside the guide sub.

Further, as a preference, the self-resetting flexible drill rod also includes an electrical circuit of the over-deflection transmission mechanism, and the electric circuit of the over-deflection transmission mechanism is fixedly arranged inside the self-resetting flexible drill rod, and the specific arrangement method can be arranged in In the gap between the through structure of the articulated transmission sub-joint and the flow channel, and the electrical circuit of the over-deflection transmission mechanism moves synchronously with the self-resetting flexible drill pipe and each articulated transmission sub-joint contained therein, and the electrical circuit of the over-deflection transmission mechanism and The measurement and control circuit is electrically connected to the electrical actuator, and is used for supplying power to the measurement and control circuit and the electrical actuator.

The so-called necessary components of the system, the end of the self-resetting flexible drill pipe is provided with a power supply and a mud pulser, the power supply can be an downhole turbine generator, and the downhole turbine generator is used for the measurement and control through the electrical circuit of the deflection transmission mechanism. The circuit and the electrical actuator are powered; the mud pulser communicates with the measurement and control circuit through the deflection transmission mechanism electrical circuit, and further transmits the information in the measurement and control circuit to the ground through pressure pulse waves.

Further, preferably, the minimum distance between the deflection centers of any two weight-on-bit torque deflection transmission mechanisms in the self-resetting flexible drill rod is less than 8 times the diameter of the drill bit.

Compared with prior art, the beneficial effect of the present invention is:

The self-resetting flexible drill pipe formed by the articulated transmission sub-joint with limited rotation and deflection angle realizes the transmission of drilling pressure torque and rotational power in the short-radius well section, and realizes independent support for each articulated transmission sub-joint through the elastic recovery mechanism. In order to ensure that the drilling pressure can be stably transmitted to the steering sub-joint, and the steering control will not be unstable due to the excessive swing of the articulated transmission sub-joint, so as to meet the requirements for the accuracy of the wellbore trajectory in the drilling of short-radius holes; because the device of the present invention can Realize bending and the rigidity of the device of the present invention is far lower than that of conventional drill pipes or drill collars, so the steering tool can be steered with extremely low steering force (lateral force), so as to improve the short-radius directional drilling technology for multiple layers. The engineering feasibility and practical value of oil and gas field development, thin layer development, remaining oil potential tapping, coal bed methane development and other types of mineral development.

Description of drawings

Fig. 1 is a schematic diagram of the overall structure of a high-stability short-radius deflection drilling tool;

Fig. 2 is a structural schematic diagram of an articulated drive sub in a high-stability short-radius deflection drilling tool;

Fig. 3 is a schematic diagram of a self-resetting flexible drill pipe of a high-stability short-radius deflection drilling tool;

Fig. 4 is a schematic diagram of the elastic recovery mechanism of the articulated transmission sub-joint in a high-stability short-radius deflection drilling tool;

Fig. 5 is a flow channel installation schematic diagram of a high-stability short-radius deflection drilling tool;

Fig. 6 is a spring plate installation diagram of a high-stability short-radius deflection drilling tool;

Fig. 7 is a schematic diagram of the power supply and communication system of a high-stability short-radius deflection drilling tool;

Fig. 8 is a schematic diagram of a static offset steering sub of a high-stability short-radius deflection drilling tool.

In the figure: 1. Guiding nipple; 11. Guiding sleeve; 12. Driving mandrel; 2. Articulated driving nipple; 3. Drill bit; 4. Fulcrum structure; 41. First fulcrum structure; 42. Second fulcrum structure ;6. Drive interface; 7. Elastic recovery mechanism; 8. Electric circuit of over-deflection transmission mechanism; 9. Centralizer; 13. Guidance actuator; 15. Measurement and control circuit; 21. Universal joint; Mechanism; 23. Through structure; 24. Input end; 25. Output end; 26. Rotary valve; 27. Electrical actuator; 28. Runner; 29. Power supply; 30. Mud pulser; 51. Front composite bearing; 52. Rear composite bearing; 71. Through elastic tube; 72. Elastic plate; 73. Flexible rod;

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

Embodiment 1: Please refer to the accompanying drawings 1-7, the present invention provides a technical solution: a high-stability short-radius deflection drilling tool, which includes a steering nipple 1, a drill bit 3 and a self-resetting flexible drill pipe, wherein, The tail end of the self-resetting flexible drill pipe is provided with a drive interface 6, and through the drive interface 6, it is driven to a rotary drive power unit or any other type of drill string to obtain the rotary drilling power required for rotary drilling. It should be noted that the drive interface 6 is a threaded thread. The rotary driving device can be various types of drilling rigs, drilling machines or downhole power drilling tools. A high-stability short-radius deflection drilling tool can be connected to the drill pipe through the threaded thread at the rear end, and the drilling rig drives the drill pipe. Rod rotation, and further drive the rotation of the high-stability short-radius deflection drilling tool to achieve controllable trajectory rotary drilling, in which the steering sub can be a guiding sub of any principle, which can realize the steering function under the condition of rotary drilling Any guiding pup joints are within the scope of protection of this patent.

It is characterized in that the front end of the self-resetting flexible drill rod is fixedly connected to the rear end of the guiding sub-section 1, and the self-resetting flexible drilling rod can steerably transmit drilling pressure and torque to the guiding sub-joint 1, and the front end of the guiding sub-joint 1 is fixed A drill bit 3 is provided, and the rotary driving power device drives the drill bit 3 through a self-resetting flexible drill rod; specifically, the connection mode between the self-resetting flexible drill rod and the guide nipple 1 can also be threaded connection, coupling connection, etc., which can realize the drilling pressure torque The transmission connection method; it needs to be added that the rotary drive power unit can also be a mud motor located in the wellbore, a turntable located at the wellhead, a top drive or a rotary drive head, wherein the rotary drive head mainly refers to a horizontal drilling machine or other types The component that drives the drill string to rotate in a directional drilling machine. In this embodiment, the centralizer (9) is arranged on the outside of the self-resetting flexible drill rod and the distance from the front end of the drill bit (3) is less than 3 meters.

It should be emphasized that the advantage of the device of the present invention is that the controllable transmission joint array can be realized to drill in a rotating state in a short-radius wellbore. Under this condition, since the self-resetting flexible drill pipe is generally Rotational, so the main force component of the friction force is the circumferential tangential direction of the self-resetting flexible drill pipe, which greatly reduces the axial friction force and enables trajectory control in ultra-short radius wellbore.

In this embodiment, when the elastic recovery mechanism is an elastic member such as an elastic rod, an elastic plate 72 or a spring, the self-resetting flexible drill rod includes an elastic recovery mechanism 7 and a plurality of articulated transmission joints 2, and each articulated transmission short A plurality of weight-on-bit torque deflection transmission mechanisms 22 are fixed in each section 2, and the weight-on-bit torque deflection transmission mechanisms 22 have an input end 24 and an output end 25, and the output end 25 on the hinged transmission short joint 2 is hinged with the adjacent hinge The input end 24 on the transmission sub-joint 2 is connected, and each articulated transmission sub-joint 2 is equipped with a set of elastic recovery mechanism 7, when the elastic recovery mechanism 7 is through the elastic tube 71 or through the elastic rod, the articulated transmission sub-joint 2 and the elastic recovery mechanism 7 is provided with a fulcrum structure 4, the elastic recovery mechanism 7 can independently support the hinged transmission sub-joint 2, and is used to ensure that the self-resetting flexible drill pipe provides the recovery force to restore the straight line state, and because each hinge The transmission sub-joint 2 realizes the independent support to ensure that the self-resetting flexible drill pipe does not buckle. Its advantage is that it can ensure that each articulated transmission sub-joint 2 is restrained from each other, and avoids the interference force disturbance caused by the buckling of the self-resetting flexible drill pipe. The operation of the guiding mechanism; specifically, the input end 24 and the output end 25 are connected to each other for the purpose of transmitting the drilling pressure torque. The input end 24 and the output end 25 are interchangeable, and the connection method can be threaded connection, integrated Any method capable of transmitting drilling pressure and torque, such as chemical manufacturing and welding, and a number of articulated transmission nipples 2 constitute a self-resetting flexible drill pipe. It should be emphasized that the advantage of the device of the present invention is that the controllable transmission joint array can be used to guide drilling in a rotating state in a short-radius wellbore. Wellbore adaptability, the stability is achieved through the elastic recovery mechanism, buckling is prevented, and the drilling pressure is transmitted to the drill bit along the axis of the self-resetting flexible drill pipe and the steering sub, which facilitates the improvement of drilling stability and avoids damage to the drill bit. Disturbance of the guiding force of the guiding pup.

The output end 25 of the first articulated transmission joint 2 on the left side is fixedly connected with the input end of the guide joint 1 .

In this embodiment, the length of the self-resetting flexible drill pipe is greater than 10m; the limit deflection angle between every two adjacent articulated transmission sub-joints 2 is less than 8°; specifically, the limit deflection angle is the mechanical Structural limits to prevent the articulated drive nipple 2 from buckling excessively during the transmission of the weight-on-bit torque, thereby hindering the transmission of the weight-on-bit torque.

In this embodiment, as shown in Figure 1, the articulated transmission sub-joint 2 has a through structure 23 extending along its axial direction, and an elastic recovery mechanism is provided in the through structure 23, and the elastic recovery mechanism also serves as a flow channel for the circulation medium of drilling. There is a centralizing structure 4 between the hinged transmission sub-joint 2 and the elastic reset structure inside it, so that the adjacent hinged transmission sub-joints 2 maintain a coaxial state; the elastic recovery mechanism 7 includes a hinged transmission sub-joint The penetrating structure of 2 connects the through elastic tube 71 of the input end and output end of the hinged transmission nipple 2, and the penetrating elastic tube 71 and the penetrating structure of the hinged transmission nipple 2 form an activity space, giving the through elastic tube 71 leaves more sufficient deformation space, so that it can bear a greater amount of deformation. The through elastic tube 71 provides a restoring force that keeps the input shaft and output shaft of the articulated drive pup joint on the same straight line, which is much smaller than The thrust generated when the steering sub-joint deflects, and the guiding sub-joint in the present invention is only responsible for performing the steering action, and the downhole turbine generator and mud pulser are arranged at the rear of the self-resetting flexible drill pipe, so the described The length of the guide nipple is shorter, and the deflection point where the bending occurs is lower, which is more conducive to the release of the tool's guiding performance; specifically, the elastic recovery mechanism is a flexible through-pressure metal tube, and its pressure-bearing standard meets the above-mentioned flexible through-pressure-bearing The pressure difference between the drilling fluid inside the metal pipe and the drilling fluid outside the pipe is enough.

In this embodiment, a limit mechanism is set on the hinged transmission sub-joint 2, and the limit mechanism can limit the deflection angle between adjacent hinged transmission sub-joints 2 from 0° to 5°. When rotating at any angle in the range of 0°～5°, the restoring force provided by the elastic recovery mechanism 7 to drive the input end and output end of the articulated drive sub to return to the coaxial state is greater than the WOB multiplied by sinα at this angle, so that the articulated drive sub The input and output maintain a tendency to return to the coaxial state.

In this embodiment, especially in the embodiment shown in FIG. 1, there are two or more fulcrum structures 4, wherein the section between the first fulcrum structure 41 and the second fulcrum structure 42 is set as a supporting section, The axial length of the support end is greater than 15mm, and is used to keep the position of the support section, and the hinged transmission short joint 2 is kept coaxial with the corresponding section of the flexible member.

In this embodiment, especially a high-stability short-radius deflection drilling tool shown in FIG. 3, the elastic recovery mechanism 7 can be any elastic member, and the elastic member is set as a flexible rod 73; specifically, The elastic part can also be set as a flexible tube or a flexible rod 73. The swing between the hinged transmission sub-joints 2 will cause the flexible part to deform, and the flexibility of the flexible part will resist the tendency of deformation. Swing occurs between joints 2; furthermore, the elastic recovery mechanism 7 includes a plurality of flexible rods 73 arranged in a centrally symmetrical ring in the drill collar housing of the articulated drive sub-joint, and the flexible rods 73 provide the input of the articulated drive sub-joint 2 The restoring force that the shaft and the output shaft are on the same straight line, or in other words, the elastic restoring structure may also include a plurality of leaf springs arranged in the deflection space between the lever structure and the shell of the drill collar and other equivalent alternatives.

In this embodiment, the outer wall of the guide nipple 1 is provided with a centralizer 9, and the guide nipple 1 is provided with a measurement and control circuit 15, a guide actuator 13, a rotary valve 26 and an electric actuator 27; specifically, each articulated transmission nipple 2 includes at least one universal joint 21, and the universal joint 21 is used to bear the drilling pressure and torque during the drilling process, and continuously provide power for the drill bit 3 to rotate and drill. The maximum limit angle value of all articulated transmission joints 2 between the guide actuator 13 and the remote transmission joint is greater than 3°, and the optimum range is above 10°, so as to ensure sufficient flexibility of the device of the present invention.

In this embodiment, the self-resetting flexible drill rod also includes an over-deflection transmission mechanism electrical circuit 8, and the over-deflection transmission mechanism electrical circuit 8 is fixedly arranged on the inner wall of the self-reset flexible drill rod, and the over-deflection transmission mechanism electrical circuit 8 is connected to the hinge transmission The pup joint 2 moves synchronously, and the electric circuit 8 of the over-deflection transmission mechanism is electrically connected to the electric actuator 27 and the rotary valve 26 in turn; it should be noted that since the focus of the present invention is to solve the problem of guiding stability, the guiding actuator 13 is specially required There should be no excessive swing in the vicinity, which will cause the drill bit 3 to advance in a helical manner or to withstand the side of the well wall, seriously affecting the control accuracy of the wellbore trajectory. Therefore, the present invention sets a self-resetting flexible The drill rod is used to make the drill string behind the guide knuckle have a certain degree of coaxiality, and the length of the self-resetting flexible drill rod depends on the cost. Furthermore, the length of the self-resetting flexible drill rod is greater than ten times the diameter of the drill bit, and, At least three weight-on-bit torque deflection transmission mechanisms 22 are included.

The so-called necessary components of the system, the end of the self-resetting flexible drill pipe is provided with a power supply 29 and a mud pulser 30, the power supply 29 can be a downhole turbine generator, and the downhole turbine generator is the measurement and control circuit 15 and the electrical circuit 8 through the deflection transmission mechanism electrical circuit 8. The actuator 27 supplies power; the mud pulser 30 communicates with the measurement and control circuit 15 through the electrical circuit 8 of the deflection transmission mechanism, and further transmits the information in the measurement and control circuit 15 to the ground through pressure pulse waves.

In this embodiment, the minimum distance between the deflection centers of any two weight-on-bit torque deflection transmission mechanisms 22 in the self-resetting flexible drill rod is less than 8 times the diameter of the drill bit 3, so as to facilitate the transmission of the weight-on-bit torque from the drill bit 3 to the uppermost joint. The sections between them can achieve enough curvature to complete the drilling of short-radius wells and realize the maximum deflection; specifically, under the same deflection performance conditions, or the same high-curvature borehole passability conditions, shorten each The length of joint articulated transmission sub-joint 2, that is, shortening the distance between two deflection points, can reduce the deflection limit of each deflection point, so as to protect the weight-on-bit torque transmission sub-joint from damage and reduce downhole vibration , especially to protect the universal joint 21 used to transmit rotary drilling power in the weight-on-bit torque transmission sub-joint from being damaged.

Embodiment 2: Please refer to accompanying drawing 8, the present invention provides another technical solution of the guiding pup joint:

The guide puppet 1 includes a drive mandrel 12 and a guide sleeve 11 that is looped outside the drive mandrel. The guide sleeve is looped around the outside of the drive mandrel by at least two pairs of composite bearings. The composite bearings include front composite bearings 51 and rear composite bearings. Bearing 52, the front end of the driving mandrel is fixedly equipped with a drill bit 3, the rear end of the driving mandrel is fixedly connected to the output end of the self-resetting flexible drill rod, and the guiding sleeve is provided with a guiding actuator 13, an electric actuator 27 and a measurement and control circuit 15; The embodiment also includes an electric energy rotation transmission sending end 411 and an electric energy rotation transmission receiving end 412, which are used to transmit the electric energy transmitted through the electrical circuit of the deflection transmission mechanism to the electrical appliances including the electric actuator in the guide sleeve, for Electrical consumers in the guide sleeve provide electrical energy. The power rotation transmission sending end 411 is fixedly connected to the drive mandrel, and is electrically connected to the electrical circuit 8 of the over-deflection transmission mechanism. The power rotation transmission receiving end 412 is fixedly connected to the guide sleeve, and at least electrically connected to the electric actuator.

In this embodiment, factors such as high borehole curvature, buckling of the self-resetting flexible drill pipe, buckling of the self-resetting flexible drill pipe, and scraping of the borehole wall will cause drastic fluctuations in the rotational speed of the drill string. Therefore, in order to avoid damage to the electric energy rotational transmission transmitting end 411 and the electric energy rotational transmission receiving end 412, to realize the smooth energy reception of the electrical device in the guide sleeve and to realize signal transmission, the electric energy rotational transmission transmitting end 411 and the electric energy rotational transmission receiving end 411 The terminal 412 can be a wireless energy transmitting terminal and a wireless energy receiving terminal respectively, that is, the transmitting terminal 411 of the electric energy rotating transmission and the receiving terminal 412 of the electric energy rotating transmission adopt high-frequency wireless power transmission to transmit energy, so an inverter is set behind the driving mandrel 12 Short joint 31 The inverter short joint accommodates at least one inverter circuit for inverting direct current into high frequency alternating current compatible with the transmitting end 411 of electric energy rotation transmission. Since both the steering sub and the inverter sub inevitably occupy a long space, the first self-resetting flexible drill pipe is installed between the driving mandrel and the inverter sub to increase the system's adaptability to high borehole curvature At the same time, it has a certain degree of toughness, so that the system has the restoring force to restore the coaxial state in the wellbore, so that the WOB can spread along a straight line near the drill bit as much as possible, instead of spreading on the severely buckled pipe string , further exacerbating the buckling. The inverter nipple is used to invert the DC power transmitted by the power supply into a high-frequency AC power in the range of 5-300kHz, and the high-frequency AC power is transmitted to the electric energy rotation transmission sending end through the first self-resetting flexible drill pipe through the deflection transmission mechanism electrical circuit 8 411, which is further received by the electric energy rotation transmission receiving end 412, and the AC power received by the electric energy rotation transmission receiving end 412 is further converted into direct current through the rectification circuit arranged in the guide sleeve, and supplied to the electrical appliances in the guide sleeve.

The guiding actuator is a pushing type guiding actuator, including at least a hydraulic piston. The hydraulic piston can directly push against the well wall in the radial direction of the guiding sub, or the hydraulic piston can push the radial direction of the guiding sub to the well wall through the thrust rib. Apply thrust. In order to further improve system stability and maintain the stability of the guide sleeve, each set of piston assemblies is equipped with an independent hydraulic system directly connected to the piston cylinder, so that each guide actuator can apply thrust to the well wall during drilling. To avoid the vibration of the guiding sub, and reduce the interference of the swing of the self-resetting flexible drill pipe on the guiding function of the guiding sub. An electric actuator includes at least a hydraulic system for providing hydraulic pressure to a hydraulic piston. The guide sleeve includes at least 3 sets of guide actuators and at least three sets of hydraulic systems. The resultant force generated by multiple sets of guide actuators pushing against the well wall in the radial direction makes the drill bit deflect.

Furthermore, a certain length of second self-resetting flexible drill pipe is fixedly connected to the rear of the inverter sub-joint, which is used to better improve the transmission state of the WOB torque near the drill bit.

It should be noted that the left end in accompanying drawing 8 is the direction of the drill bit, and the front section described in the present invention, and the right end in accompanying drawing 8 is the direction away from the drill bit, that is, the rear end described in the present invention.

In addition, the present invention does not repeat the common sense issues in this field. For example, the circuit in the present invention should adopt pressure-bearing sealing, and the electrical circuit in the present invention should adopt insulation protection and insulation connection.

Although the embodiments of the present invention have been shown and described, those skilled in the art can understand that various changes, modifications and substitutions can be made to these embodiments without departing from the principle and spirit of the present invention. and modifications, the scope of the invention is defined by the appended claims and their equivalents.

Claims (10)

1. The utility model provides a high stability short radius deflecting drilling tool, its includes direction nipple joint (1), drill bit (3), from flexible drilling rod of resetting and centralizer (9), wherein, the rear end of flexible drilling rod of self resetting is provided with drive interface (6) to drive in rotatory drive power device or drilling string through drive interface (6), in order to acquire rotatory required rotatory drilling power of drilling, its characterized in that: the front end of the self-resetting flexible drill rod is fixedly connected with the rear end of the guide pup joint (1), the self-resetting flexible drill rod can transfer drilling pressure and torque to the guide pup joint (1) in a steering way, and a drill bit (3) is fixedly arranged at the front end of the guide pup joint (1); the centralizer (9) is arranged on the outer side of the guide pup joint (1), and/or the centralizer (9) is arranged on the outer side of the self-resetting flexible drill rod and the distance value between the centralizer and the front end of the drill bit (3) is smaller than 3 meters; the self-resetting flexible drill rod comprises a plurality of groups of elastic restoring mechanisms (7) and a plurality of hinged transmission pup joints (2), wherein at least one weight-on-bit torque deflection transmission mechanism (22) is fixed in each hinged transmission pup joint (2), and the elastic restoring mechanisms (7) are arranged in the hinged transmission pup joints (2) and are used for enabling two adjacent hinged transmission pup joints (2) to restore to a coaxial state; a guide executing mechanism (13) is arranged in the guide pup joint (1); the guide actuating mechanism at least comprises a hydraulic piston, wherein the hydraulic piston can directly push against the well wall along the radial direction of the guide pup joint, or the hydraulic piston can apply thrust to the well wall along the radial direction of the guide pup joint by pushing against the rib.

2. A high stability short radius whipstock drilling tool as claimed in claim 1, wherein: every two adjacent deflection intervals of the hinged transmission pup joint (2) are internally provided with a group of elastic restoring mechanisms (7), or the elastic restoring mechanisms penetrate through a plurality of the hinged transmission pup joints (2) and are respectively provided with a fulcrum structure (4) between the hinged transmission pup joints (2), so that restoring force of the elastic restoring mechanisms (7) for restoring a linear state can be transmitted to the hinged transmission pup joints (2) through the fulcrum structures (4), and two adjacent hinged transmission pup joints (2) can restore a coaxial state.

3. A high stability short radius whipstock drilling tool as claimed in claim 2, wherein: the length of the hinged transmission pup joint (2) is less than 1.5 meters; the limit deflection angle between every two adjacent hinged transmission pup joints (2) is smaller than 8 degrees.

4. A high stability short radius whipstock drilling tool as claimed in claim 2, wherein: the hinged transmission nipple (2) extends along the axial direction of the hinged transmission nipple to form a through structure (23), and a runner (28) for circulating drilling circulation medium is arranged in the through structure (23) and used for circulating the drilling circulation medium; and/or, elasticity recovery mechanism (7) are elastic tube (71) and are used for supplying well drilling circulation medium circulation, elastic tube (71) run through a plurality of articulated transmission nipple (2) inside link up structure (23), elastic tube (71) with be provided with fulcrum structure (4) between articulated transmission nipple (2), elastic tube (71) can be through fulcrum structure (4) to every articulated transmission nipple (2) independently support, make elastic tube (71) can make two adjacent articulated transmission nipple (2) resume coaxial state.

5. A high stability short radius whipstock drilling tool as claimed in claim 4, wherein: the hinge joint transmission nipple (2) is provided with a limiting mechanism, and the limiting mechanism can limit the deflection angle between adjacent hinge joint transmission nipple (2) to be 0-5 degrees.

6. A high stability short radius whipstock drilling tool as claimed in claim 4, wherein: the fulcrum structures (4) are provided with more than two, wherein a section between the first fulcrum structure (41) and the second fulcrum structure (42) is provided as a support section, and the axial length of the support section is greater than 15mm.

7. A high stability short radius whipstock drilling tool as claimed in claim 4, wherein: when the weight-on-bit torque deflection transmission mechanism (22) deflects by any angle, the elastic restoring mechanism (7) drives the input end (24) of the weight-on-bit torque deflection transmission mechanism (22) and the output end (25) of the weight-on-bit torque deflection transmission mechanism (22) to restore the coaxial state, so that the restoring force of the coaxial state can overcome the radial component force generated under the rated maximum weight-on-bit under the angle.

8. A high stability short radius whipstock drilling tool as claimed in claim 1, wherein: and a measurement and control circuit (15) and an electric actuator (27) are arranged in the guide pup joint (1).

9. A high stability short radius whipstock drilling tool as claimed in claim 8, wherein: the self-resetting flexible drill rod further comprises an over-deflection transmission mechanism electric circuit (8), the over-deflection transmission mechanism electric circuit (8) is fixedly arranged on the inner wall of the self-resetting flexible drill rod, the over-deflection transmission mechanism electric circuit (8) and the hinged transmission nipple (2) synchronously move, and the over-deflection transmission mechanism electric circuit is electrically connected with the measurement and control circuit (15) and the electric actuator (27).

10. A high stability short radius whipstock drilling tool as claimed in claim 7, wherein: the minimum distance between the deflection centers of any two weight-on-bit torque deflection transmission mechanisms (22) in the self-resetting flexible drill rod is lower than 8 times of the diameter of the drill bit (3).