CN113482526A - Flexible guiding drilling tool - Google Patents
Flexible guiding drilling tool Download PDFInfo
- Publication number
- CN113482526A CN113482526A CN202110506084.6A CN202110506084A CN113482526A CN 113482526 A CN113482526 A CN 113482526A CN 202110506084 A CN202110506084 A CN 202110506084A CN 113482526 A CN113482526 A CN 113482526A
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- China
- Prior art keywords
- flexible
- drilling
- driving
- guide
- transmission mechanism
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Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B7/00—Special methods or apparatus for drilling
- E21B7/04—Directional drilling
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B10/00—Drill bits
- E21B10/42—Rotary drag type drill bits with teeth, blades or like cutting elements, e.g. fork-type bits, fish tail bits
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B10/00—Drill bits
- E21B10/60—Drill bits characterised by conduits or nozzles for drilling fluids
- E21B10/602—Drill bits characterised by conduits or nozzles for drilling fluids the bit being a rotary drag type bit with blades
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/02—Couplings; joints
- E21B17/04—Couplings; joints between rod or the like and bit or between rod and rod or the like
- E21B17/05—Swivel joints
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/20—Flexible or articulated drilling pipes, e.g. flexible or articulated rods, pipes or cables
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/20—Flexible or articulated drilling pipes, e.g. flexible or articulated rods, pipes or cables
- E21B17/206—Flexible or articulated drilling pipes, e.g. flexible or articulated rods, pipes or cables with conductors, e.g. electrical, optical
Abstract
The invention discloses a flexible guiding well drilling tool, and relates to the technical field of well drilling and drilling. According to the flexible guide drilling tool disclosed by the invention, the trafficability of the flexible guide drilling tool is improved through the flexible driving drill column and the flexible driving control system, and the problem of well track control in a well with an extremely short radius is solved; the flexible guide drilling tool can drive the drill bit to deflect in a preset direction under the rotary drilling condition by arranging the deflection guide mechanism; the drilling power transmission is realized through a plurality of bearing short sections connected by a universal transmission mechanism; the deflection guide mechanism and the electric drive actuator are respectively arranged in different functional short sections and are connected by the flexible transmission mechanism, so that the length of the guide drilling section and the distance between all universal transmission mechanisms are shortened to the maximum extent, and the control problem of the flexible guide drilling tool is solved. The invention can realize the drilling of the short-radius-extremely short-radius borehole or the continuous guided drilling through the short-radius-extremely short-radius borehole.
Description
Technical Field
The invention relates to the technical field of drilling and boring, in particular to a flexible guiding drilling tool.
Background
Exploration and development of subterranean material resources and space resources requires the use of extensive drilling techniques. The existing steering drilling technology mainly comprises a downhole motor steering drilling technology and a rotary steering drilling technology. The maximum build-up rate of the technology can not exceed 15 degrees/30 meters generally, and the drilling controllable track short-radius steering drilling with the curvature radius smaller than 60 meters can not be realized. In the prior art, a plurality of radial or short-radius drilling technologies which cannot effectively control the well track exist, and the technologies have poor effects on developing and utilizing underground resources. However, in the field of very short radius drilling with a turning radius smaller than 10 meters, the existing radial drilling technology or short radius drilling technology does not have a guiding function and cannot realize control of a well track. Because the rotary steering systems currently in use are inherently inflexible, they are nearly impossible to adapt to the actual requirements of short radius drilling and are unable to achieve short to very short radius directional drilling under rotary drilling conditions. Other related products in the prior art also have the function of failing to realize the track control of the well under the condition of rotary drilling, which leads to the serious problem of dragging and drilling pressure. The above short-very short radius drilling also comprises continuing steerable drilling through the short-very short radius interval at the bottom end of the short-very short radius interval.
The present invention proposes an effective solution to the above problems. The length of each bearing short section is reduced by arranging the electric drive actuator and the hydraulic flow dividing device in different short section bearing short sections, so that the purpose of greatly improving the passing performance of the flexible guiding drilling tool is achieved.
Disclosure of Invention
The invention aims to provide a flexible guiding drilling tool capable of realizing the directional drilling of a short-extremely short-radius well hole or the directional drilling of an extended well section of the short-extremely short-radius well hole.
To achieve the above object, the present invention provides a flexible guide drilling tool, comprising:
the guide drilling short section comprises a drill bit and a guide short section, the guide short section comprises a guide short section body, a deflection guide mechanism is arranged on the guide short section body, and the drill bit is arranged at the lower part of the guide drilling short section;
the flexible driving drill column can transmit drilling power and comprises a plurality of bearing short sections which are sequentially connected from top to bottom; drilling power is transmitted between the adjacent bearing short sections through a universal transmission mechanism; a through structure which penetrates through the flexible driving drill string along the axial direction is arranged in the flexible driving drill string, so that a through space along the axial direction of the flexible driving drill string can be formed;
the flexible driving control system comprises a driving control device, a flexible transmission mechanism and a deflection guide mechanism, wherein the flexible transmission mechanism comprises any one or a combination of an articulated joint, a universal joint, a flexible rod/pipe and an elastic rod/pipe; the driving control device is arranged above the guide drilling short section and at least one set of universal transmission mechanism is arranged between the driving control device and the guide drilling short section; the driving control device controls the deflection guide mechanism by driving the flexible transmission mechanism to reciprocate, rotate or swing; the driving control device can control the deflection guide mechanism by crossing the universal transmission mechanism through the flexible transmission mechanism;
specifically, two ends of the flexible transmission mechanism are respectively connected with the drive control device and the deflection guide mechanism, and the flexible transmission mechanism performs reciprocating motion along the axial direction of the flexible drive drill string, namely performs reciprocating motion upwards or downwards; the flexible transmission mechanism rotates, namely the flexible transmission mechanism rotates by taking the axis of the flexible driving drill string as a rotating shaft; the flexible transmission mechanism swings by taking the axis of the flexible driving drill column as a rotating shaft; the universal transmission mechanism is a universal joint structure formed by a hinge structure and a torque transmission piece, or the universal transmission mechanism is formed by a hinge structure and an independent universal joint, or the universal transmission mechanism is a hinge type universal joint, the specific implementation mode of the universal transmission mechanism in the flexible driving drill column is similar to the connection structure between each short joint in the flexible drill rod, the specific design structure of the universal transmission mechanism is the prior art, and the details are not repeated.
The flexible driving drill string control device has the advantages that the flexible driving drill string can control the deflection guide mechanism by spanning a plurality of universal transmission mechanisms in the through structure, so that the driving control device can be independently arranged behind the guide drilling nipple, and the driving control device is prevented from being arranged in the guide drilling nipple. The flexible driving control system shortens the length of the guide drilling short section and the distance between the deflection centers of all the hinge points behind the guide drilling short section to the maximum extent, so that the flexible driving drill column can pass through a high-curvature well hole more easily, drilling power is transmitted in the high-curvature well hole, and the control of a deflection guide mechanism is realized. In the specific implementation process, because the bearing short sections in the flexible driving drill string can mutually transmit axial force and/or bear torque through the universal transmission mechanism, the reaction torque generated by the flexible transmission mechanism rotated by the driving control device is borne by the flexible driving drill string, so that the technical scheme of the invention is realized. The drill bit in the invention mainly realizes the rock breaking structure of rock and soil in the drilling process, and the diameter-protecting section or the lateral cutting teeth can be arranged at any position outside the guide nipple body.
Specifically, the guiding drilling nipple comprises a guiding nipple body and a drill bit structure, wherein the drill bit structure is arranged on the lower portion of the guiding nipple body in a fusing mode, the fusing mode is integrally manufactured or connected through threads, the guiding nipple body is cylindrical, a deflection guide mechanism for executing a guiding function is arranged on the guiding nipple body, the deflection guide mechanism can drive a drill bit to deflect according to a preset direction, so that the drill bit is driven to deflect under the condition of rotary drilling, the track of a well hole is changed, and ultra-short radius drilling or guiding drilling is continuously carried out through an ultra-short radius well section;
further, preferably, the driving control device is a driving short section, and the driving short section is connected between the guided drilling short section and the flexible driving drill string through a universal transmission mechanism, or the driving short section is connected with two adjacent bearing short sections through the universal transmission mechanism;
the driving short section comprises a driving short section body and an electric driving actuator, the deflection guide mechanism comprises a hydraulic flow dividing device and a piston assembly, the electric driving actuator drives the hydraulic flow dividing device through a flexible transmission mechanism so as to periodically communicate high-pressure drilling fluid in a through flow channel on the guiding short section body with a piston accommodating cavity, and the piston assembly directly or indirectly provides lateral cutting force for a drill bit or assists the drill bit to swing towards a guide direction so as to drive the drill bit to deflect according to a preset direction;
it should be noted that the bearing short section provided with the electrically driven actuator is the driving short section.
Further, preferably, the electric drive actuator is an electric motor, wherein the electric motor comprises a motor rotor and a motor stator, and the motor stator is fixedly connected with the drive nipple body;
the hydraulic shunting device comprises a rotary valve rotor and a rotary valve stator, the rotary valve rotor is coupled with the motor rotor through a flexible transmission mechanism, the motor rotor can drive the rotary valve rotor to rotate relative to the rotary valve stator, the rotary valve stator is fixedly connected with the guide short section body, and the rotary valve stator is provided with a plurality of valve positions which respectively correspond to the piston assemblies one by one;
the flexible transmission mechanism at least comprises a built-in universal joint or an elastic rod. Specifically, the power output end of the motor rotor is connected with the power input end of the rotary valve rotor through a built-in universal joint, or the power output end of the motor rotor is connected with the power input end of the rotary valve through an elastic rod. The motor is a servo motor capable of realizing angle position control.
The hydraulic shunting device is a rotary valve, the electric drive actuator is an electric motor, the rotary valve is driven by the electric motor, and a rotor of the rotary valve is connected with a rotor of the electric motor through a built-in universal joint and used for realizing transmission. The guide short section body is provided with a through flow channel, the motor can drive the hydraulic flow dividing device to be periodically communicated with the piston assembly through the through flow channel, and the motor is electrically connected with the drive control circuit.
Further, preferably, the flexible transmission mechanism comprises an internal universal joint, and the internal universal joint in the flexible transmission mechanism is arranged at a focus of an extension line of the axis of the output end of the electric drive actuator and the axis of the input end of the hydraulic shunting device.
Specifically, the focal point of the extension line of the axis of the output end of the electric drive actuator and the axis of the input end of the hydraulic flow dividing device is the deflection center of the control shaft, and the deflection center of the control shaft and the deflection point of the universal transmission mechanism outside the control shaft keep concentric.
The function of the flexible transmission mechanism is that the focus of an extension line of the axis of the output end of the electric drive actuator and the axis of the input end of the hydraulic flow dividing device is the deflection center of the flexible transmission mechanism, and the deflection center of the flexible transmission mechanism is concentric with the deflection point of the universal transmission mechanism outside the flexible transmission mechanism. It should be noted that the universal transmission mechanism between the deflection center of the control shaft and the outer side of the control shaft is a universal transmission mechanism between the guide drilling short section and the driving short section.
Further, preferably, the flexible transmission mechanism comprises a straddle rod, the electrically driven actuator is connected with the hydraulic shunt device through the straddle rod, and the straddle rod drives the hydraulic shunt device to shunt high-pressure drilling fluid to the guide actuator mechanism through rotation and/or axial movement.
The motor rotor and the rotary valve rotor are connected with two ends of the bridging rod through built-in universal joints, and the motor rotor can drive the rotary valve rotor to rotate relative to the rotary valve stator through the bridging rod. When the guide short section and the driving short section are separated by two or more universal transmission mechanisms, a plurality of bridging rods are arranged, the bridging rods are connected through built-in universal joints, the bridging rod adjacent to the rotary valve is connected with the rotary valve rotor through the built-in universal joints, and the bridging rod adjacent to the motor is connected with the motor rotor through the built-in universal joints.
The hydraulic shunt device is arranged in the guide short section, the electric drive actuator is arranged in the drive short section, and the electric drive actuator cannot be directly hinged with the hydraulic shunt device, so that the electric drive actuator is connected with the hydraulic shunt device through a cross-connecting rod, and the cross-connecting rod drives the hydraulic shunt device to shunt high-pressure drilling fluid to the guide actuator mechanism through rotation and/or axial movement. In this embodiment, it is preferable that the hydraulic pressure dividing device is a rotary valve, the electrically driven actuator is an electric motor, the rotary valve is driven by the electric motor, and a rotor of the rotary valve is rotatably connected to the electric motor via a jumper rod. The cross connecting rod is hinged with the motor rotor and the rotary valve rotor respectively and used for realizing transmission. It should be noted that the straddle rod drives the hydraulic diversion device to divert high pressure drilling fluid to the steering actuator mechanism by rotational and/or axial movement. The driving short section is hinged with the guiding short section through a universal transmission mechanism and/or the driving short section is hinged with the bearing short section through a universal transmission mechanism. Furthermore, the universal drive comprises at least one transmission joint which can transmit axial forces. Such as a cross-pin universal joint, or any combination of universal joints and ball joints.
Further, as a preferable mode,
the flexible transmission mechanism is an elastic rod, the elastic rod is arranged in a through space inside the flexible driving drill column, and two ends of the elastic rod are respectively connected with the motor and the hydraulic flow dividing device, so that the motor rotor can drive the rotary valve rotor to rotate. The rotary valve rotor is connected with the motor rotor through an elastic rod, and the motor rotor drives the rotary valve rotor to rotate through the elastic rod.
Further, as a preferable mode,
the span rod or the elastic rod is suspended inside the bearing short section containing the span rod or the elastic rod through the suspension bearing.
Further, as a preferable mode,
the piston assembly comprises driving pistons and piston accommodating cavities which are arranged along the circumferential direction of the guide short section body at intervals, the driving pistons comprise driving pistons and piston accommodating cavities which are connected to the cylinder wall of the guide short section body, the driving pistons can be directly abutted against the well wall or indirectly abutted against the well wall through pushing rib wings, and the drill bit deflects along a preset direction through telescopic driving of the driving pistons. The piston assembly comprises a plurality of sets of driving pistons and piston accommodating cavities, and is a plurality of sets of mechanisms which can be stretched under the hydraulic action and provide thrust. It is within the scope of the present invention that the drive piston be a circular cross-section plunger, a non-circular cross-section piston, or other equivalent alternatives. The method for indirectly pushing the driving piston against the well wall comprises the step of transmitting thrust to the well wall through the pushing rib wings or the pushing blocks.
Further, preferably, the electric control system further comprises a drive control short section, wherein the drive control short section is arranged above the drive short section and is provided with a drive control circuit, and the drive control circuit is electrically connected with the electric drive actuator through a jumper line. It should be noted that the jumper line is disposed through an electrical line crossing an inner wall or a through space of the universal transmission mechanism, and may be used to transmit electric power and/or communication signals and/or control signals. In particular, the method can be used for controlling the motor by the drive control circuit and can also be used for power transmission.
Further, when the flexible guiding drilling tool is used for multilateral well drilling, the flexible guiding drilling tool also comprises a high-rigidity drill string, and the high-rigidity drill string can realize the transmission of drilling power in a main well bore; the high-rigidity drill column can transmit drilling power to the guide drilling nipple through the flexible driving drill column, and the bending rigidity of the high-rigidity drill column is at least 10 times of that of the flexible driving drill column, so that the high-efficiency transmission of the drilling power is realized;
the length of the guide drilling short section is less than 1 meter and less than 5 times of the outside diameter of the drill bit, the average length of the bearing short section is less than 0.5 meter and less than 3 times of the outside diameter of the drill bit, so that the universal driving mechanism is suitable for the curvature of the borehole 300 of a branch well with short radius or extremely short radius, and the free deflection angle range of the universal driving mechanism is more than 2 degrees;
the total length of the guide drilling nipple and the flexible driving drill string is greater than the axial length of the branch well hole;
it should be noted that both the pilot drilling section and the flexible drive string may enter the lateral section, i.e., the window formed by the main wellbore and the lateral wellbore, as the drilling depth of the lateral increases. When the lateral drilling of the branch well is carried out in a deep well, the well depth of the main well hole is far larger than the length of the branch well section. Therefore, the invention adopts the high-rigidity drill string to transmit the drilling power in the main well bore, which is beneficial to reducing the loss of the drilling power during the transmission process. I.e. the rotary drilling device at the wellhead transmits rotary drilling power to the flexible drive string inside the main wellbore through the highly rigid drill string. As the optimal choice of cost performance, the high rigidity drilling string is a drilling string formed by connecting conventional drill pipes or drill collars in series.
Further, preferably, the system further comprises a strapdown attitude measurement module, wherein the strapdown attitude measurement module can measure the inclination angle and/or the gravity tool face angle and/or the magnetic tool face angle of the flexible guiding drilling tool in the well. The strapdown attitude measurement module comprises an accelerometer, a magnetometer or a gyroscope, and the accelerometer, the magnetometer or the gyroscope is fixedly connected with the flexible guided drilling tool and rotates along with the flexible guided drilling tool; the guidance control circuit is electrically connected with the strapdown attitude measurement module and the drive control circuit, and the guidance control circuit can control the electric drive actuator to execute command action according to the detection data of the strapdown attitude measurement module.
Further, preferably, the strapdown posture measuring module is arranged inside the guided drilling nipple and used for measuring the posture of the guided drilling nipple. The attitude of the position close to the drill bit can be measured more accurately.
Preferably, the strapdown attitude measurement module comprises at least two accelerometers which are arranged along the radial direction and form a preset angle with each other, and can measure the gravity tool face angle of the flexible guiding drilling tool.
Further, preferably, the attitude measurement module comprises an attitude measurement circuit, and the attitude measurement circuit is manufactured by adopting a thick film circuit process. The purpose is to reduce the length of the guide drilling short section more easily.
Further, as the preferred, still include power nipple joint, power nipple joint connects in series in the arbitrary position in the flexible drive drilling string, perhaps, power nipple joint sets up in the top of flexible drive drilling string.
It should be noted that, when the power sub is connected in series to any position in the flexible driving drill string, the length of the power sub must not exceed 5 times of the outer diameter of the drill bit. When the power supply short joint is arranged above the flexible driving drill string, no requirement is imposed on the length of the power supply short joint. The power supply nipple can be a turbine generator or a battery nipple.
Compared with the prior art, the invention has the following advantages:
the flexible guiding well drilling tool provided by the invention is provided with the deflection guiding mechanism through the flexible transmission mechanism pair, so that the size of a guiding drilling section can be greatly shortened, the trafficability of the flexible guiding well drilling tool in a short-radius well hole or a very short-radius well hole is improved, and the flexible guiding well drilling tool realizes a guiding function under a rotary well drilling condition. The deflection guide mechanism can drive the drill bit to deflect in a preset direction so as to change the track of the well hole, thereby realizing the short-extremely short radius directional drilling or completing the directional drilling of an extended well section of the short-extremely short radius well section; in particular, in applications where extended reach drilling is continued through a very short radius well section, the pilot drilling joints and the flexible drive drill string need to pass through the very short radius well section, and therefore, the pilot drilling tool has strong flexibility by arranging the deflection guide mechanism and the electric drive actuator in different sub sections respectively and by connecting the deflection guide mechanism and the electric drive actuator by a universal transmission mechanism. The problems described in the background of the invention can be solved by realizing or continuing guided drilling through a short radius-very short radius borehole.
Because the drive control circuit contains a large amount of power devices and needs the heat dissipation space, consequently set up the drive control circuit in the drive control nipple joint at drive nipple joint rear to realize being connected of drive control nipple joint and neighbouring other nipple joints through universal drive mechanism, thereby effectively shortened the length of direction nipple joint, and then realized orientation function more easily in high camber well. The problems described in the background of the invention can be better solved by realizing or continuing guided drilling through short radius to very short radius boreholes.
The invention selects the electrically driven actuator to distribute the drilling fluid in the through flow passage for the piston assembly so as to realize the guiding to a specific direction, can save the energy required by the guiding process to the maximum extent, and plays an important role in reducing the volumes of mechanical structures and circuits.
The strapdown attitude measurement module can realize attitude measurement of the flexible guiding drilling tool without depending on an inertial platform, and eliminates a large amount of space occupied by the inertial platform and hidden dangers brought by the inertial platform. The flexible guide drilling tool guide short section body or the bearing short section is facilitated to be miniaturized.
The circuit or the module with the appointed function is manufactured by adopting a thick film circuit process, so that the occupied space can be reduced to the maximum extent, the axial length of the bearing short section where each circuit is located is reduced to the maximum extent, and the purpose of improving the trafficability of the flexible guiding drilling tool to the maximum extent is achieved.
Drawings
The drawings are only for purposes of illustrating and explaining the present invention and are not to be construed as limiting the scope of the present invention. Wherein:
FIG. 1 is a schematic view of a first configuration of a flexible pilot drilling tool of the present invention;
FIG. 2 is a schematic diagram of a second configuration of the flexible pilot drilling tool of the present invention;
FIG. 3 is a schematic view of a third configuration of the flexible pilot drilling tool of the present invention;
FIG. 4 is a general schematic view of the flexible pilot drilling tool of the present invention based on the directional principle;
FIG. 5 is a partial schematic view of a flexible steerable drilling tool of the present invention based on the steering principle;
FIG. 6 is a schematic representation of the flexible pilot drilling tool of the present invention in an operational state.
The reference numbers illustrate:
100. guiding to drill a short section;
110. a drill bit; 111. a swing lever; 112. an inner articulated joint; 113. a flexible transmission mechanism; 115. a suspension bearing; 1131. a universal joint is arranged inside; 1132. an elastic rod; 1133. a cross-connecting rod;
120. a guide short section; 121. a guide short section body; 1211. a through flow channel; 1212. a throttling device;
131. a piston assembly; 1311. a piston accommodating chamber; 1312. a drive piston; 1313. a backup member;
140. an electrically driven actuator; 141. a hydraulic flow divider; 1411. a rotary valve rotor; 1412. a rotary valve stator; 1413. a drill bit nozzle; 1414. communicating the valve ports; 142. an electric motor; 1421. a motor rotor; 1422. a motor stator; 143. an electromagnetic valve; 144. a rotary transformer;
150. driving the short section; 151. a driving nipple body;
200. a flexible drive drill string;
210. a bearing short section;
220. a universal transmission mechanism; 221. an articulated gimbal; 223. a flow tube;
230. a drive control circuit;
240. connecting a line in a bridging way;
250. a steering control circuit;
260. a power supply short section;
270. a strapdown attitude measurement module;
280. driving the control short section;
290. a guide control short section;
300. a wellbore.
Detailed Description
In order to clearly understand the technical solution, the purpose and the effect of the present invention, a detailed description of the present invention will be described with reference to the accompanying drawings. Where adjective or adverbial modifiers "upper" and "lower", "inner" and "outer", "front" and "rear" are used merely to facilitate relative reference between groups of terms, and do not describe any particular directional limitation on the modified terms. The terms "forward" and "rearward" described herein refer to forward and rearward in the drilling direction. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated, whereby a feature defined as "first", "second", etc. may explicitly or implicitly include one or more of such features. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
To solve the above problems, as shown in fig. 1 to 6, the present invention provides a flexible guiding drilling tool which can drill a short-to-very short radius borehole 300 and/or complete the drilling of an extended borehole 300 through the short-to-very short radius borehole 300. In the present invention, very short radius wellbores are not well defined in the art, and refer primarily to wellbores having a turning radius of less than 10 meters.
The invention aims to provide a flexible guiding drilling tool capable of realizing the directional drilling of a short-extremely short-radius well hole or the directional drilling of an extended well section of the short-extremely short-radius well hole.
To achieve the above object, the present invention provides a flexible guide drilling tool, comprising:
the guide drilling short section comprises a drill bit and a guide short section, the guide short section comprises a guide short section body, a deflection guide mechanism is arranged on the guide short section body, and the drill bit is connected to the lower part of the guide short section body;
the flexible driving drill column can transmit drilling power and comprises a plurality of bearing short sections which are sequentially connected from top to bottom; drilling power is transmitted between the adjacent bearing short sections through a universal transmission mechanism; a through structure which penetrates through the flexible driving drill string along the axial direction is arranged in the flexible driving drill string, so that a through space along the axial direction of the flexible driving drill string can be formed;
the flexible driving control system comprises a driving control device, a flexible transmission mechanism and a deflection guide mechanism, wherein the flexible transmission mechanism comprises any one or a combination of an articulated joint, a universal joint, a flexible rod/pipe and an elastic rod/pipe; the driving control device is arranged above the guide drilling short section and at least one set of universal transmission mechanism is arranged between the driving control device and the guide drilling short section; the driving control device controls the deflection guide mechanism by driving the flexible transmission mechanism to reciprocate, rotate or swing; the driving control device can control the deflection guide mechanism by crossing the universal transmission mechanism through the flexible transmission mechanism;
specifically, the flexible transmission mechanism "reciprocates" refers to reciprocating along the axial direction of the flexible driving drill string, i.e. reciprocates upwards or downwards; the flexible transmission mechanism rotates, namely the flexible transmission mechanism rotates by taking the axis of the flexible driving drill string as a rotating shaft; the flexible transmission mechanism swings by taking the axis of the flexible driving drill column as a rotating shaft; the universal transmission mechanism is a universal joint structure formed by a hinge structure and a torque transmission piece, or the universal transmission mechanism is formed by a hinge structure and an independent universal joint, or the universal transmission mechanism is a hinge type universal joint, the specific implementation mode of the universal transmission mechanism in the flexible driving drill column is similar to the connection structure between each short joint in the flexible drill rod, the specific design structure of the universal transmission mechanism is the prior art, and the details are not repeated.
The flexible driving drill string control device has the advantages that the flexible driving drill string can control the deflection guide mechanism by spanning a plurality of universal transmission mechanisms in the through structure, so that the driving control device can be independently arranged behind the guide drilling nipple, and the driving control device is prevented from being arranged in the guide drilling nipple. The flexible driving control system shortens the length of the guide drilling short section and the distance between the deflection centers of all the hinge points behind the guide drilling short section to the maximum extent, so that the flexible driving drill column can pass through a high-curvature well hole more easily, drilling power is transmitted in the high-curvature well hole, and the control of a deflection guide mechanism is realized. In the specific implementation process, because the bearing short sections in the flexible driving drill string can mutually transmit axial force and/or bear torque through the universal transmission mechanism, the reaction torque generated by the flexible transmission mechanism rotated by the driving control device is borne by the flexible driving drill string, so that the technical scheme of the invention is realized. The drill bit in the invention mainly realizes the rock breaking structure of rock and soil in the drilling process, and the diameter-protecting section or the lateral cutting teeth can be arranged at any position outside the guide nipple body.
Specifically, the guided drilling nipple comprises a guide nipple body 121 and a drill bit structure 110, the drill bit structure is arranged on the lower portion of the guide nipple body in a fusing mode, the fusing mode is integrally manufactured or connected through threads, the guide nipple body 121 is cylindrical, a deflection guide mechanism for executing a guiding function is arranged on the guide nipple body 121, and the deflection guide mechanism can drive the drill bit 110 to deflect according to a preset direction so as to drive the drill bit 110 to deflect under a rotary drilling condition, so that a well track is changed, and ultra-short radius drilling or continuous guided drilling through an ultra-short radius well section is realized;
in this embodiment, the driving control device is a driving short section, and the driving short section is connected between the guided drilling short section and the flexible driving drill string through a universal transmission mechanism, or the driving short section is connected with two adjacent bearing short sections through the universal transmission mechanism;
the driving sub 150 comprises a driving sub body 151 and an electric driving actuator 140, the deflection guide mechanism comprises a hydraulic flow dividing device 141 and a piston assembly 131, the electric driving actuator drives the hydraulic flow dividing device 141 through a flexible transmission mechanism so as to periodically communicate high-pressure drilling fluid in a through flow passage 1211 on the guiding sub body with a piston accommodating cavity 1311, and the piston assembly directly or indirectly provides lateral cutting force for a drill bit or assists the drill bit to swing towards a guide direction so as to drive the drill bit to deflect in a preset direction;
it should be noted that the carrier sub provided with the electrically driven actuator is the drive sub 150.
In this embodiment, the electric drive actuator is an electric motor 142, where the electric motor includes an electric motor rotor and an electric motor stator, and the electric motor stator is connected with a drive nipple body fixing 151;
the hydraulic shunting device comprises a rotary valve rotor and a rotary valve stator, the rotary valve rotor is coupled with the motor rotor through a flexible transmission mechanism, the motor rotor can drive the rotary valve rotor to rotate relative to the rotary valve stator, the rotary valve stator is fixedly connected with the guide short section body, and the rotary valve stator is provided with a plurality of valve positions which respectively correspond to the piston assemblies one by one;
the flexible transmission mechanism at least comprises a built-in universal joint or an elastic rod. Specifically, the power output end of the motor rotor is connected with the power input end of the rotary valve rotor through a built-in universal joint, or the power output end of the motor rotor is connected with the power input end of the rotary valve through an elastic rod. The motor is a servo motor capable of realizing angle position control.
The hydraulic shunting device is a rotary valve, the electric drive actuator is an electric motor 142, the rotary valve is driven by the electric motor 142, and the rotary valve rotor 1411 and the electric motor rotor 1421 are connected by a built-in universal joint 1131 and are used for realizing transmission. The guide short section body is provided with a through flow channel, the motor can drive the hydraulic flow dividing device to be periodically communicated with the piston assembly through the through flow channel, and the motor is electrically connected with the drive control circuit.
Further, preferably, the flexible transmission mechanism comprises an internal universal joint, and the internal universal joint in the flexible transmission mechanism is arranged at a focus of an extension line of the axis of the output end of the electric drive actuator and the axis of the input end of the hydraulic shunting device.
Specifically, the focal point of the extension line of the axis of the output end of the electric drive actuator and the axis of the input end of the hydraulic flow dividing device is the deflection center of the control shaft, and the deflection center of the control shaft and the deflection point of the universal transmission mechanism outside the control shaft keep concentric.
The function of the flexible transmission mechanism is that, as the focus of the extension line of the axis of the output end of the electric drive actuator and the axis of the input end of the hydraulic shunting device 141 is the deflection center of the flexible transmission mechanism, the deflection center of the flexible transmission mechanism is concentric with the deflection point of the universal transmission mechanism outside the flexible transmission mechanism. It should be noted that the universal transmission mechanism between the deflection center of the control shaft and the outer side of the control shaft is a universal transmission mechanism between the pilot drilling sub 100 and the driving sub 150.
In one embodiment, as shown in FIG. 2, the electrically driven actuator is connected to the hydraulic shunt device by a straddle rod that drives the hydraulic shunt device by rotational and/or axial movement to shunt high pressure drilling fluid to the steering actuator mechanism.
The motor rotor and the rotary valve rotor are connected with two ends of the bridging rod 1133 through an internal universal joint 1131, and the motor rotor can drive the rotary valve rotor to rotate relative to the rotary valve stator through the bridging rod 1133. When the guide short section and the driving short section are separated by two or more universal transmission mechanisms, a plurality of bridging rods are arranged, the bridging rods are connected through built-in universal joints, the bridging rod adjacent to the rotary valve is connected with the rotary valve rotor through the built-in universal joints, and the bridging rod adjacent to the motor is connected with the motor rotor through the built-in universal joints.
The hydraulic shunt device 141 is arranged in the guide short section, the electric drive actuator 140 is arranged in the drive short section 150, the electric drive actuator 140 cannot be directly hinged with the hydraulic shunt device 141, so the electric drive actuator 140 is connected with the hydraulic shunt device 141 through a cross-connecting rod, and the cross-connecting rod drives the hydraulic shunt device to shunt high-pressure drilling fluid to the guide actuator mechanism through rotation and/or axial movement. In this embodiment, it is preferable that the hydraulic pressure dividing device is a rotary valve, the electrically driven actuator is an electric motor 142, the rotary valve is driven by the electric motor 142, and the rotary valve rotor 1411 is connected to the electric motor rotor 1421 through a jumper bar. The cross connecting rod is hinged with the motor rotor and the rotary valve rotor respectively and used for realizing transmission. It should be noted that the straddle rod drives the hydraulic diversion device to divert high pressure drilling fluid to the steering actuator mechanism by rotational and/or axial movement. The driving short section is hinged with the guiding short section through a universal transmission mechanism and/or the driving short section is hinged with the bearing short section through a universal transmission mechanism. Furthermore, the universal drive comprises at least one transmission joint which can transmit axial forces. Such as a cross-pin universal joint, or any combination of universal joints and ball joints.
In a further embodiment of the method according to the invention,
the flexible transmission mechanism is an elastic rod 1132, as shown in fig. 3, the elastic rod is arranged in a through space inside the flexible driving drill string, and two ends of the elastic rod are respectively connected with the motor and the hydraulic shunting device, so that the motor rotor can drive the rotary valve rotor to rotate. The rotary valve rotor 1411 is connected with the motor rotor 1421 by an elastic rod 1132, and the motor rotor 1421 drives the rotary valve rotor 1411 to rotate through the elastic rod 1132.
Preferably, the cross-over rod or the elastic rod is suspended inside the bearing nipple accommodating the cross-over rod or the elastic rod through a suspension bearing 115.
In this embodiment, the piston assembly includes that drive piston 1312 and piston holding chamber 1311 are set up along the circumference interval of direction nipple joint body, drive piston is including connecting in drive piston and the piston holding chamber on the section of thick bamboo wall of direction nipple joint body, drive piston can directly support against the wall of a well or support against the wall of a well through pushing away the rib indirectly, through the flexible drive of drive piston the drill bit is according to presetting the direction deflection. The piston assembly comprises a plurality of sets of driving pistons and piston accommodating cavities, and is a plurality of sets of mechanisms which can be stretched under the hydraulic action and provide thrust. It is within the scope of the present invention that the drive piston be a circular cross-section plunger, a non-circular cross-section piston, or other equivalent alternatives. The method for indirectly pushing the driving piston against the well wall comprises the step of transmitting thrust to the well wall through the pushing rib wings or the pushing blocks.
In this embodiment, still include drive control nipple joint, drive control nipple joint set up in drive nipple joint top, it is equipped with drive control circuit, drive control circuit through cross-over connection circuit with the electric drive executor is electric. It should be noted that the jumper line is disposed through an electrical line crossing an inner wall or a through space of the universal transmission mechanism, and may be used to transmit electric power and/or communication signals and/or control signals. In particular, the method can be used for controlling the motor by the drive control circuit and can also be used for power transmission.
In this embodiment, when the flexible steering drilling tool is used for branch drilling, the flexible steering drilling tool further comprises a high-rigidity drill string, wherein the high-rigidity drill string can realize the transmission of drilling power in a main borehole and transmit the drilling power to the steering drilling nipple through the flexible driving drill string, and the bending rigidity of the high-rigidity drill string is at least 10 times of that of the flexible driving drill string;
the length of the guide drilling nipple is less than 5 times of the diameter of the drill bit, and the average length of the guide nipple body 121 is less than 3 times of the diameter of the drill bit, so that the guide drilling nipple is suitable for the curvature of the borehole 300 of the ultra-short radius branch well;
the total length of the guide drilling nipple and the flexible driving drill string is greater than the axial length of the branch well hole;
when the flexible guide drilling tool is used for branch drilling, the guide drilling section and the flexible driving drill string can enter a branch well section, namely a window formed by a main well hole and a branch well hole, along with the increase of the drilling footage of the branch well. When the lateral drilling of the branch well is carried out in a deep well, the well depth of the main well hole is far larger than the length of the branch well section. Therefore, the invention adopts the high-rigidity drill string to transmit the drilling power in the main well bore, which is beneficial to reducing the loss of the drilling power during the transmission process. I.e. the rotary drilling device at the wellhead transmits rotary drilling power to the flexible drive string inside the main wellbore through the highly rigid drill string. As the optimal choice of cost performance, the high rigidity drilling string is a drilling string formed by connecting conventional drill pipes or drill collars in series.
In this embodiment, the system further comprises a strapdown attitude measurement module 270 and a steering control circuit 250, wherein the strapdown attitude measurement module can measure the inclination angle and/or the gravity tool face angle and/or the magnetic tool face angle of the flexible steering drilling tool in the well; the guidance control circuit is electrically connected with the strapdown attitude measurement module and the drive control circuit, and the guidance control circuit can control the electric drive actuator to execute command action according to the detection data of the strapdown attitude measurement module.
In this embodiment, the strapdown posture measuring module 270 is disposed inside the guided drilling nipple and is used for measuring the posture of the guided drilling nipple. The attitude of the position close to the drill bit can be measured more accurately.
In this embodiment, the strapdown attitude measurement module includes at least two accelerometers radially arranged and forming a preset angle with each other, and is capable of measuring a gravity toolface angle of the flexible guiding drilling tool.
In this embodiment, the attitude measurement module 270 includes an attitude measurement circuit, and the attitude measurement circuit is manufactured by using a thick film circuit process. The purpose is to reduce the length of the guide drilling short section more easily.
In this embodiment, still include the power nipple joint, the power nipple joint connect in series in the optional position in the flexible drive drilling string, perhaps, the power nipple joint set up in the top of flexible drive drilling string.
It should be noted that, when the power sub is connected in series to any position in the flexible driving drill string, the length of the power sub must not exceed 5 times of the outer diameter of the drill bit. When the power supply short joint is arranged above the flexible driving drill string, no requirement is imposed on the length of the power supply short joint. The power supply nipple can be a turbine generator or a battery nipple.
The following describes an embodiment specifically according to the drawings, and the following describes an embodiment of the deflection guide mechanism for realizing deflection of the guided drilling short section, as a plurality of support cases of the guide short section and the deflection guide mechanism in the claim one, so as to support the protection range of the guide short section and the deflection guide mechanism:
the embodiment shown in fig. 1 depicts a flexible steering drilling tool based on the push-against principle. The piston assembly 131 is disposed on the cylindrical wall structure of the guide sub body 121, the piston assembly 131 includes a piston receiving cavity 1311 and a driving piston 1312, and the drill bit 110 is disposed at the lower portion of the guide sub body 121.
The flexible guide drilling tool described in this embodiment drives the motor 140 to operate through the driving control circuit 230, the motor 140 is a servo motor, the servo motor includes a rotary transformer 144, and the driving control circuit can control the servo motor to rotate to a precise angle position.
The electric motor 140 is connected to the hydraulic shunting device 141 via a flexible transmission 113. The hydraulic shunting device is a rotary valve provided with a communication valve port 1414, the drive control circuit drives the rotary valve to flexibly drive a drill string to reversely rotate at a constant speed through a motor, so that the opening direction of the rotary valve faces a certain sector, and along with the rotation of the flexibly driven drill string, when any piston accommodating cavity rotates along with the guide drilling short section to the sector facing the opening of the rotary valve, the rotary valve communication valve port can communicate a through flow passage 1211 arranged on the guide drilling short section body 121 with the piston accommodating cavity 1311. The hydraulic shunt device 141 can be periodically communicated with the piston assembly 131 through the through flow passage 1211 under the driving of the motor 142, so that the driving piston 1312 can periodically abut against the well wall while the drill string rotates, and thus the reaction force of the well wall to the preset guiding direction of the guiding nipple body 121 of the guiding nipple 120 is obtained, and the drill bit 110 is driven to deflect towards the guiding direction. When the guiding direction needs to be adjusted, the opening direction of the rotary valve can be adjusted by slowly increasing/decreasing the relative speed of the rotary valve and the flexible driving drill string.
When the piston assembly 131 is arranged in the middle or on the upper part of the guide short section body, the guide control circuit drives the motor through the drive control circuit, and further controls the deflection guide mechanism to enable the piston accommodating cavity 1311 in the sector in the preset guide direction to be in contact with a high-pressure drilling circulating medium in a through flow channel in the guide short section body 121 of the guide short section 120 according to the flow, so that the drive piston 1312 in the sector is abutted against the well wall, and the guide drilling short section obtains the reaction force from the well wall; meanwhile, the hydraulic shunting device blocks the piston accommodating cavity in the sector back to the preset guiding direction from contacting the through flow channel, and residual drilling circulating medium in the piston accommodating cavity in the sector back to the preset guiding direction leaks through the throttling device 1212, so that the driving piston 1312 in the sector in the preset guiding direction is promoted to be recovered; under the action, the well wall can apply resultant force back to the guiding direction to the middle part or the rear part of the guiding nipple joint body 121, and the drill bit is further pried to swing towards the guiding direction, so that the guiding drilling function is realized. Under such conditions, the use of a long gage drill bit may promote and enhance the steering effect.
On the contrary, as shown in fig. 2, when the piston assembly 131 is arranged close to the lower end face of the drill bit, the guide control circuit makes the piston accommodating cavity 1311 in the sector back to the guide direction contact with the high-pressure fluid in the flow passage inside the guide nipple body 121 of the guide nipple 120 through the above-mentioned flow, so that the drive piston of the sector is abutted against the well wall; (ii) a Meanwhile, the drilling circulation medium in the piston accommodating cavity in the sector with the preset guiding direction leaks through the throttling device 1212, so that the driving piston 1312 in the sector with the preset guiding direction is recovered; the action enables the well wall to apply resultant force towards the guiding direction to the front part of the guiding nipple body, and further pushes the drill bit to cut the well wall towards the guiding direction, so that the guiding drilling function is realized. Under such conditions, the use of short gage drill bits may promote and enhance the steering effect.
It should be noted that the preset manner of presetting the guiding direction may be presetting the guiding direction before the tool is put into the well and presetting the guiding control circuit 250 or presetting the guiding direction by a signal sent by the pressure change or flow change of the mud in the drilling process, the guiding control circuit 250 can issue an instruction to the driving control circuit 230 according to the preset direction, the specific flow is the prior art, and the detailed description is omitted in the present invention; the drilling fluid from the drill string water hole enters the inside of the drill bit 110 through the through flow passage 1211 in the guide nipple body 121 and then flows into the annular space, the drill bit nozzle 1413 is arranged in the inside of the drill bit 110 or in the flow passage between the drill bit 110 and the hydraulic flow dividing device 141, when the drilling fluid flows through the nozzle or the throttling structure, pressure drop can be generated, the pressure drop is the working pressure difference of the piston assembly 131, the specific process and principle of generating the pressure difference are common knowledge in the field, and details are not repeated here. The periodic communication means that the communication between the through flow channel and the piston assembly is periodically changed along with the rotation of the flexible guiding drilling tool so as to ensure that the piston assembly in a specific sector obtains hydraulic pressure for driving a deflection guiding mechanism to drive a drill bit to deflect towards a guiding direction.
In another embodiment shown in fig. 3, the flexible transmission mechanism is an elastic rod 1132, the elastic rod is disposed in a through space inside the flexible driving drill string, and two ends of the elastic rod are respectively connected to a motor and the hydraulic shunt device, so that the motor rotor can drive the rotary valve rotor to rotate. The rotary valve rotor 1411 is connected with the motor rotor 1421 by an elastic rod 1132, and the motor rotor 1421 drives the rotary valve rotor 1411 to rotate through the elastic rod 1132.
The embodiment shown in fig. 4 and 5 illustrates a flexible steering drilling tool based on the pointing principle. The upper end of the drill bit 110 is coaxially connected with a swing lever 111, specifically, the swing lever 111 is a cylindrical structure, the swing lever 111 is sleeved outside the guide nipple body 121, preferably, the swing lever 111 and the drill bit 110 are an integral structure, or the swing lever 111 is welded to the upper end of the drill bit 110. The lower part of the swing lever 111 is connected with the lower end of the guide short section body 121 through an inner hinged universal joint 112, a movable gap is formed between the swing lever 111 and the guide short section body 121, a piston assembly is arranged in the movable gap and positioned below the inner hinged universal joint 112, a driving piston 1312 can be abutted against the well wall through the swing lever 111, and the expansion and contraction of the driving piston 1312 can drive the swing lever 111 to rotate around the center of the inner hinged universal joint 112, so that the drill bit 110 is driven to deflect in a preset direction to achieve guiding; during drilling, the guide nipple body transfers the bit pressure and torque to the drill bit through the inner articulated universal joint 112.
In this embodiment, the electrically driven actuator is connected to the hydraulic shunt 141 through the jumper 1133 in an articulated manner, the steering control circuit 250 drives the motor 142 through the driving control circuit 230 to make the piston accommodating chamber 1311 in the sector facing away from the steering direction contact with the high-pressure fluid in the through structure 1211, so that the driving piston 1312 in the sector pushes against the borehole wall, a force facing away from the steering direction can be applied to the upper portion of the swing lever 111, and the drill bit is driven by the swing lever with the inner articulated universal joint 112 as the center to generate a deflection angle facing the steering direction.
Preferably, the length of the swing lever 111 is at least 30% of the distance between the inner articulated universal joint 112 and the adjacent universal transmission mechanism above the inner articulated universal joint, so that the space of the guide nipple body 121 can be fully utilized to extend the upper moment arm, and the drill bit 110 can obtain as much guiding force as possible;
the above description is only an exemplary embodiment of the present invention, and is not intended to limit the scope of the present invention. Any equivalent changes and modifications that can be made by one skilled in the art without departing from the spirit and principles of the invention should fall within the protection scope of the invention. It should be noted that the components of the present invention are not limited to the above-mentioned whole application, and various technical features described in the present specification can be selected to be used alone or in combination according to actual needs, so that the present invention naturally covers other combinations and specific applications related to the invention.
Claims (15)
1. A flexible steerable drilling tool, comprising:
the guide drilling short section comprises a drill bit and a guide short section body, wherein a deflection guide mechanism is arranged on the guide short section body, and the drill bit is arranged at the lower part of the guide drilling short section;
the flexible driving drill column can transmit drilling power and comprises a plurality of bearing short sections which are sequentially connected from top to bottom; drilling power is transmitted between the adjacent bearing short sections through a universal transmission mechanism; a through structure which penetrates through the flexible driving drill string along the axial direction is arranged in the flexible driving drill string, and a through space can be formed along the axial direction of the flexible driving drill string;
the flexible driving control system comprises a driving control device, a flexible transmission mechanism and a deflection guide mechanism, wherein the flexible transmission mechanism comprises any one or a combination of an articulated joint, a universal joint, a flexible rod/pipe and an elastic rod/pipe; the driving control device is arranged above the guide drilling short section and at least one set of universal transmission mechanism is arranged between the driving control device and the guide drilling short section; the driving control device controls the deflection guide mechanism by driving the flexible transmission mechanism to reciprocate, rotate or swing.
2. A flexible guided drilling tool as claimed in claim 1, comprising:
the driving control device is a driving short section which is connected between the guiding drilling short section and the flexible driving drill string through a universal transmission mechanism, or the driving short section is connected with two adjacent bearing short sections through the universal transmission mechanism;
the driving short section comprises an electric driving actuator, the deflection guide mechanism comprises a hydraulic flow dividing device and a piston assembly, and the electric driving actuator drives the hydraulic flow dividing device through a flexible transmission mechanism so as to periodically communicate high-pressure drilling fluid in a through flow passage on the guiding short section body with the piston assembly.
3. A flexible steerable drilling tool as in claim 2,
the electric drive actuator is a motor, wherein the motor comprises a motor rotor and a motor stator, and the motor stator is fixedly connected with the drive short section body;
the hydraulic shunting device comprises a rotary valve rotor and a rotary valve stator, the rotary valve rotor is connected with the motor rotor through a flexible transmission mechanism, the motor rotor can drive the rotary valve rotor to rotate relative to the rotary valve stator, the rotary valve stator is fixedly connected with the guide short section body, and the rotary valve stator is provided with a plurality of valve positions which respectively correspond to the piston assemblies one by one;
the flexible transmission mechanism at least comprises a built-in universal joint or an elastic rod.
4. A flexible guided well tool according to claim 3, wherein the flexible transmission comprises an internal gimbal disposed at a focus of a line of extension of the axis of the output of the electrically driven actuator and the axis of the input of the hydraulic shunt device.
5. A flexible guided well tool as claimed in claim 2, wherein the flexible transmission comprises a straddle rod through which the electrically driven actuator is connected to the hydraulic diversion device, the straddle rod driving the hydraulic diversion device by rotational and/or axial movement to divert high pressure drilling fluid to the piston assembly.
6. The flexible guide well drilling tool according to claim 3, wherein the flexible transmission mechanism is an elastic rod, and both ends of the elastic rod are respectively connected with a motor and the hydraulic flow dividing device, so that the motor rotor drives the rotary valve rotor to rotate.
7. A flexible steerable drilling tool as in claim 5 or 6, wherein the straddle or resilient rod is suspended by suspension bearings within the carrier sub in which it is housed.
8. The flexible guiding drilling tool according to claim 1, wherein the piston assembly comprises driving pistons arranged at intervals along the circumferential direction of the guiding nipple body, the driving pistons comprise driving pistons and piston accommodating cavities connected to the wall of the guiding nipple body, the driving pistons can directly abut against the well wall or indirectly abut against the well wall through pushing ribs, and the drill bit is driven to deflect in a preset direction through the extension and contraction of the driving pistons.
9. The flexible guided well drilling tool of claim 1, further comprising a drive control sub disposed above the drive sub and having a drive control circuit electrically connected to the electrically driven actuator via a jumper line.
10. The flexible steerable drilling tool of claim 1, further comprising a high-stiffness drill string capable of transmitting drilling power to the flexible drive drill string and to the steerable drilling sub through the flexible drive drill string in the main wellbore, the high-stiffness drill string having a bending stiffness at least 10 times greater than the bending stiffness of the flexible drive drill string;
the length of the guide drilling short section is less than 1 meter and less than 5 times of the outside diameter of the drill bit, the average length of the bearing short section is less than 0.5 meter and less than 3 times of the outside diameter of the drill bit, so that the universal driving mechanism is suitable for the well curvature of a branch well with a short radius or an extremely short radius, and the free deflection angle range of the universal driving mechanism is more than 2 degrees;
the total length of the guide drilling nipple and the flexible driving drill string is larger than the axial length of the branch well hole.
11. The flexible guided well tool of claim 1, further comprising a strapdown attitude measurement module capable of measuring downhole a borehole angle and/or a gravity toolface angle and/or a magnetic toolface angle of the flexible guided well tool.
12. The flexible guided drilling tool of claim 11, wherein the strapdown attitude measurement module is disposed inside the guided drilling sub for measuring an attitude of the guided drilling sub.
13. The flexible guided well tool of claim 11, wherein the strapdown attitude measurement module comprises at least two radially disposed accelerometers at a predetermined angle relative to each other, for measuring the gravity toolface angle of the flexible guided well tool.
14. The flexible guided well tool of claim 11, wherein the attitude measurement module comprises an attitude measurement circuit fabricated using thick film circuit technology.
15. The flexible guided drilling tool of claim 1, further comprising a power sub connected in series anywhere in the flexible drive string, or disposed above the flexible drive string.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/CN2022/077722 WO2022179569A1 (en) | 2021-02-24 | 2022-02-24 | Flexible steering drilling tool |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110208694.8A CN112814568A (en) | 2021-02-24 | 2021-02-24 | Flexible guiding drilling tool |
| CN2021102086948 | 2021-02-24 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113482526A true CN113482526A (en) | 2021-10-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110208694.8A Pending CN112814568A (en) | 2021-02-24 | 2021-02-24 | Flexible guiding drilling tool |
| CN202110505202.1A Withdrawn CN113153151A (en) | 2021-02-24 | 2021-05-10 | Flexible guiding drilling tool |
| CN202110506084.6A Withdrawn CN113482526A (en) | 2021-02-24 | 2021-05-10 | Flexible guiding drilling tool |
Family Applications Before (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110208694.8A Pending CN112814568A (en) | 2021-02-24 | 2021-02-24 | Flexible guiding drilling tool |
| CN202110505202.1A Withdrawn CN113153151A (en) | 2021-02-24 | 2021-05-10 | Flexible guiding drilling tool |
Country Status (1)
| Country | Link |
|---|---|
| CN (3) | CN112814568A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114016910A (en) * | 2021-10-19 | 2022-02-08 | 中煤科工集团西安研究院有限公司 | Elastic bent section directional coal mine underground directional drilling device and method |
| CN114151011A (en) * | 2021-12-07 | 2022-03-08 | 中海油田服务股份有限公司 | Rotary steerable drilling apparatus and method of steering same |
| WO2022179569A1 (en) * | 2021-02-24 | 2022-09-01 | 万晓跃 | Flexible steering drilling tool |
| WO2023186055A1 (en) * | 2022-03-31 | 2023-10-05 | 蓝土地能源技术有限公司 | Drilling tool, drilling method and drilling guiding method |
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| WO2023001119A1 (en) * | 2021-07-19 | 2023-01-26 | 徐术 | Rear directional radial drilling device |
| CN113311554B (en) * | 2021-08-02 | 2021-11-26 | 华海通信技术有限公司 | Submarine optical cable branch equipment and submarine optical cable system |
| CN113653445A (en) * | 2021-08-17 | 2021-11-16 | 北京全地科技有限公司 | Self-vibration bit feeding flexible drilling tool |
| CN113586025B (en) * | 2021-09-03 | 2023-03-14 | 陕西延长石油（集团）有限责任公司 | Compact reservoir horizontal well intermittent volume fracturing device and method |
| CN114439370B (en) * | 2022-01-27 | 2022-09-02 | 北京探矿工程研究所 | Flexible downhole power drilling tool |
| CN115226421B (en) * | 2022-07-07 | 2023-12-19 | 国家林业和草原局华东调查规划院 | Bamboo basket crushing device |
| CN114991684B (en) * | 2022-07-19 | 2022-10-25 | 四川中安嘉盛石油科技有限公司 | Flexible nipple for rotary steering drilling and mounting method thereof |
| WO2024017272A1 (en) * | 2022-07-19 | 2024-01-25 | 万晓跃 | Underground driving device and method for small-diameter drill string |
| CN117449768A (en) * | 2022-07-19 | 2024-01-26 | 北京全地科技有限公司 | Side drilling tool |
| CN217783401U (en) * | 2022-07-20 | 2022-11-11 | 蓝土地能源技术有限公司 | Micro-hole drilling equipment |
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2021
- 2021-02-24 CN CN202110208694.8A patent/CN112814568A/en active Pending
- 2021-05-10 CN CN202110505202.1A patent/CN113153151A/en not_active Withdrawn
- 2021-05-10 CN CN202110506084.6A patent/CN113482526A/en not_active Withdrawn
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022179569A1 (en) * | 2021-02-24 | 2022-09-01 | 万晓跃 | Flexible steering drilling tool |
| CN114016910A (en) * | 2021-10-19 | 2022-02-08 | 中煤科工集团西安研究院有限公司 | Elastic bent section directional coal mine underground directional drilling device and method |
| CN114016910B (en) * | 2021-10-19 | 2024-02-13 | 中煤科工集团西安研究院有限公司 | Elastic bending joint directional underground coal mine directional drilling device and method |
| CN114151011A (en) * | 2021-12-07 | 2022-03-08 | 中海油田服务股份有限公司 | Rotary steerable drilling apparatus and method of steering same |
| CN114151011B (en) * | 2021-12-07 | 2024-02-27 | 中海油田服务股份有限公司 | Rotary steering drilling device and method for steering same |
| WO2023186055A1 (en) * | 2022-03-31 | 2023-10-05 | 蓝土地能源技术有限公司 | Drilling tool, drilling method and drilling guiding method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN112814568A (en) | 2021-05-18 |
| CN113153151A (en) | 2021-07-23 |
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