WO2022218317A1

WO2022218317A1 - High-flexibility downhole self-powered while-drilling system

Info

Publication number: WO2022218317A1
Application number: PCT/CN2022/086489
Authority: WO
Inventors: 徐梓辰; 杨忠华; 万晓跃
Original assignee: 万晓跃
Priority date: 2021-04-16
Filing date: 2022-04-13
Publication date: 2022-10-20
Also published as: CN112943097A

Abstract

Disclosed is a high-flexibility downhole self-powered while-drilling system, relating to the technical field of drilling. The high-flexibility downhole self-powered while-drilling system comprises articulated sub strings (2), and the output end of each articulated sub string is fixedly connected to a near-downhole electric appliance (9) near the output end of the articulated sub string. According to the high-flexibility downhole self-powered while-drilling system, directional drilling under the condition that a short-radius drill pipe rotates is achieved by means of the articulated sub strings, and particularly, power transmission between the near-downhole electric appliance and a turbine generator (1) is achieved by using a bridged power transmission line (7), thereby solving the problem that the near-downhole electric appliance cannot effectively obtain power, and further promoting the development of short or ultra-short radius drilling, well logging, or stratum testing technologies.

Description

A highly flexible bottom hole self-powered while drilling system

technical field

The invention relates to the technical field of drilling, in particular to a highly flexible bottom hole self-power supply while drilling system.

Background technique

In the field of existing drilling technology, the build rate of the wellbore that can be completed under controllable trajectory conditions generally does not exceed 15°/30 meters, and the general rotational steerable build rate is about 6°/30 meters, which is currently the most advanced in the world. Schlumberger's shortest radius directional steering can only reach 15°/30m, and in small boreholes, it does not exceed 18°/30m, and today's extremely short radius refers to the radius of curvature less than 10m. , Very short radius drilling refers to drilling a well section with a curvature radius of less than 10 meters or continuing drilling through a well section with a curvature radius of less than 10 meters, but in the field of short or ultra-short radius drilling, due to the inability to drill near the bottom hole, The electrical appliances in logging or formation testing equipment provide power, which greatly limits the development of short or ultra-short radius drilling, logging or formation testing technologies. Therefore, a highly flexible bottom-hole self-powering while drilling system is proposed to solve this problem. question.

SUMMARY OF THE INVENTION

(1) Technical problems solved

Aiming at the deficiencies of the prior art, the present invention provides a highly flexible bottom-hole self-powering while drilling system, which solves the problem that in the field of short- or ultra-short-radius drilling, drilling, logging or formation testing near the bottom of the hole cannot be performed. The electrical appliances in the equipment provide electrical power and thus greatly limit the development of short or ultra-short radius drilling, well logging or formation testing techniques.

(2) Technical solutions

In order to achieve the above purpose, the technical solution adopted by the present invention is: a highly flexible bottom-hole self-powering while drilling system, comprising an articulated pup joint series and a turbine generator, wherein the turbine generator is arranged in the articulated pup joint series close to the At any position in the lower part, the near-bottom electrical appliance is arranged at the lower end of the hinged pup joint series or any position close to the lower part, and the electric power input end of the near-bottom electrical appliance generates power through the substation module and the turbine through the jumper transmission line The electromechanical power output end is electrically connected or directly connected to the turbine generator through a jumper transmission line, and a through structure is provided along the axis direction of the articulated short section series arranged above the turbine generator.

Preferably, the turbine generator includes a rotor, a stator and a generator inside, the stator includes an iron core and a coil, the rotor includes a pair of magnetic steels, and the turbine is arranged outside the rotor.

Preferably, the substation module includes a rectifier circuit and a voltage stabilizer circuit, the input end of the rectifier circuit is electrically connected to the output end of the turbine generator, the output end of the rectifier circuit is electrically connected to the input end of the voltage stabilizer circuit, and the voltage stabilizer circuit is electrically connected to the input end of the voltage stabilizer circuit. The output end of the circuit is electrically connected with the input end of the electrical appliance near the bottom of the well.

Preferably, the maximum limit angle of the pup joints between each of the pup joint series is 2°-10°, the length of the pup joint series is greater than 9 meters, and the length of the pup joint series Longer than the length of the short or very short radius lateral section and its extended section.

Preferably, the pup joint series includes a plurality of pup joints that are connected to each other by transmission, torque transmission pins, torque transmission grooves, joints and seals, and the seals are arranged in the deflection gap stroke of the pup joint series, and The seals are sealing rings/through pressure-bearing pipes/corrugated sealing pipes.

Preferably, the decoding circuit and the flow velocity sensor arranged in the downhole form a downlink command solving module, the decoding circuit is electrically connected with electrical appliances near the bottom of the hole through a jumper transmission line, and the downhole flow velocity sensor is a turbine generator rotational speed counting device , and the downlink command calculation module identifies the downlink command according to the rotational speed of the turbine generator.

Preferably, a capacitor module is provided in any hinged nipple in the series of hinged nipples, and the capacitor nipple is provided with a capacitor nipple, and the capacitor nipple can temporarily store the electrical energy generated by the turbine generator.

Preferably, the preset deflection limit angle between adjacent joint short joints in the series of joint short joints is not greater than 10°, and the length of the high passability guide short joint is no more than 5 times the average diameter of the joint short joints. times, the minimum distance between the deflection centers of the individual articulation subs in the articulation pup series does not exceed 8 times the average diameter of the articulation subs.

Preferably, a signal modulation circuit and a signal demodulation circuit are arranged adjacent to the decoding circuit, and the signal demodulation circuit is also arranged adjacent to a near-bottom electrical appliance, and the signal modulation circuit can superimpose the signal to the jumper transmission line, and the signal demodulation circuit is The modulation circuit can pick up the modulation component from the jumper line superimposed into the jumper line.

Preferably, a guide wheel is provided above the turbine, and the guide wheel is fixedly connected to the hinged joint housing, and the through structure further includes a guide control module

(3) Beneficial effects

The beneficial effects of the present invention are:

1. This highly flexible bottom-hole self-power-while-drilling system realizes directional drilling under the condition of short-radius drill string rotation by articulating sub-sections in series. The articulated sub-joint jumper transmission line realizes the electric energy transmission between the electrical appliances near the bottom of the well and the turbine generator generator, and realizes the problem of supplying power to the electrical devices in the related articulated sub-sections of the articulated articulated sub-section series; further through The voltage stabilizing circuit arranged in other sub joints effectively solves the problem of power transmission and transformation during the controllable trajectory drilling of ultra-short radius branch wells and short radius branch wells. The function of the articulated pup joint makes any single puppet have a single function of the system, achieves the purpose of greatly reducing the length and volume of any puppet, improves the power transmission stability of the series of articulated puppets and bridges the transmission line Safety, easy for the tool to adapt to higher curvature wellbore, and complete the deflection task of short radius wellbore, and realize WOB torque transmission in short radius wellbore through the tandem formed by the hinged sub joints that limit the rotation deflection angle And the power transmission for rotary drilling on the axis realizes local short-radius wellbore drilling. The short-radius directional drilling technology formed by the above technical content is suitable for the development of multi-layer oil and gas fields, the development of thin layers, the potential of remaining oil, and coal seams. The development of gas and other types of minerals has engineering feasibility and practical value, and the axis itself can be bent or deviated from the original axis position under the push of the deflection guide steering device, and the system is suitable for short or very short radius drilling. In the process of well logging or formation testing, it solves the problem that electrical appliances near the bottom of the hole cannot effectively obtain power, thus solving the problem of the inability of drilling, logging or drilling near the bottom of the hole in the field of short or ultra-short radius drilling. The electrical appliances in the formation testing equipment provide electrical power and thus greatly limit the problem of short or ultra-short radius drilling, well logging or formation testing technology development.

2. The highly flexible bottom-hole self-power-while-drilling system realizes power generation by using mud power near the bottom of the well, and directly supplies power with electrical appliances near the bottom of the well. It is used in short-radius wellbore. In addition, when the near-bottom electrical appliance is a directional drilling tool that is easy to build deflection, the articulated sub-joint series is generally rotated during the directional drilling process, so the main force component of the friction force is the universal direction. Circumferential tangential direction of the segment series, thereby greatly reducing the axial friction force, and supplying power through the bottom-hole directional drilling tool, enabling trajectory control in ultra-short radius wellbore, further improving the function and practicality of the device sex

3. The highly flexible bottom-hole self-power-while-drilling system greatly shortens the length of the downhole turbo-generator generator by integrating the turbo-generator, the turbo-generator generator stator and the turbo-generator generator rotor. It is cleverly arranged in the articulated sub joint near the bottom of the hole, which greatly reduces the possibility of the tool getting stuck, and the limit deflection angle between the adjacent articulated sub joints in the series of articulated sub joints is not more than 8°, so as to avoid To prevent excessive buckling of the articulated nipples in the articulated pup tandem during force transmission, thereby hindering WOB torque transmission, and to prevent damage to the crossover power lines; the distance from the drill bit to the center of rotation of the output end of the articulated puppet tandem is not More than 10 times the average diameter of the articulation sub, and the system device can shorten the length of each articulation sub, that is, shorten the distance between the two deflection points, the deflection limit of each deflection point can be reduced, and then to achieve The function of protecting the articulated sub joint from damage and reducing downhole vibration, especially the universal joint used for transmitting rotary drilling power in the articulated sub joint, is protected from damage, thereby further improving the functional practicability of the device.

Description of drawings

1 is a schematic diagram of a highly flexible bottom-hole self-power-while-drilling system and method of the present invention;

2 is a schematic diagram of the axial cross-sectional structure of the highly flexible bottom hole self-powering while drilling system of the present invention;

Fig. 3 is the appearance schematic diagram of the turbine generator of the present invention;

FIG. 4 is a schematic cross-sectional view of the turbine generator of the present invention.

In the figure: 1 turbine generator, 1-1 turbine, 1-2 stator, 1-3 rotor, 2 articulated nipple tandem, 2-1 torque transmission pin, 2-2 torque transmission slot, 2-3 joint, 3 Substation module, 3-1 rectifier circuit, 3-2 voltage stabilizer circuit, 4 through structure, 41/411 steering control module, 42 relay communication device, 7 jumper transmission lines, 8 high-passability steering sub-sections, 9 near wellbore Bottom electrical appliances, 11 decoding circuits, A main wellbore, B extremely short radius lateral wellbore.

Detailed ways

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

As shown in Figures 1-4, the present invention provides a technical solution: a highly flexible bottom-hole self-power-while-drilling system, comprising an articulated sub-joint series 2 and a turbine generator 1, and the turbine-generator 1 is arranged on the articulated sub-joint Any position close to the lower part of the tandem 2, the near-bottom electrical appliance 9 is arranged at the lower end of the hinged joint tandem 2 or any position close to the lower part, and the power input end of the near-bottom electrical appliance 9 is transformed by jumping the transmission line 7. The electrical module 3 is electrically connected to the power output end of the turbine generator 1 or directly connected to the turbine generator 1 through a jumper transmission line 7 , and the hinged short section series 2 above the turbine generator 1 is provided with a through structure 4 along its axis direction. , it should be noted that the articulated short joint can be articulated by using a universal joint or a combination of ball head and ball seat to realize articulation. The specific setting method of the turbine generator 1 is that the turbine generator 1 is arranged in the shell of any articulation short joint. internal. The "input end" and "output end" are power input ports and power output ports, and their specific structural forms are ports that are electrically connected to welding nodes or electrical connectors or any equivalent alternative function. The power transformation module 3 converts the electrical energy generated by the turbine generator 1 into the required form of the near-bottom electrical appliances 9 by means of rectification, and the through structure 4 in the series of hinged subs is used to circulate the downhole working fluid, which can drive the downhole turbine. Generator 1 rotates.

The turbine generator 1 includes a rotor 1-3, a stator 1-2 and a turbine 1-1. The stator 1-2 includes an iron core and a coil. The rotor 1-3 is sleeved outside the stator 1-2. The rotor 1-3 contains at least a For the magnetic steel, the turbine 1-1 is arranged outside the rotor 1-3.

The substation module 3 includes a rectifier circuit 3-1 and a voltage stabilizer circuit 3-2. The input end of the rectifier circuit 3-1 is electrically connected to the output end of the turbine generator 1, and the output end of the rectifier circuit 3-1 is electrically connected to the voltage stabilizer circuit 3- 2 input end, the output end of the voltage regulator circuit 3-2 is electrically connected with the input end of the electrical appliance 9 near the bottom of the well.

The maximum limit angle of the pup joints between each articulated pup joint series 2 is 2°-10°, the length of the articulated pup joint series 2 is greater than 9 meters, and the length of the articulated pup joint series 2 is greater than the short or extremely short radius The length of the lateral well section and its extended well section.

The articulation pup joint series 2 includes a plurality of interconnected joint pup joints, a torque transmission pin 2-1, a torque transmission groove 2-2, a joint 2-3 and a sealing member, and the sealing member is arranged in the articulation pup joint series 2. During the deflection gap stroke, and the sealing element is a sealing ring/through pressure-bearing pipe/corrugated sealing pipe.

The decoding circuit 11 and the flow velocity sensor arranged in the downhole form a downlink command solving module, the decoding circuit 11 is electrically connected with the electrical appliance 9 near the bottom of the hole through the jumper power line 7, and the downhole flow velocity sensor is a rotational speed counting device of the turbine generator 1, and The downlink command solving module identifies the downlink command according to the rotational speed of the turbine generator 1. It should be noted that the flow rate sensor is the generator stator 1-2, and the rotating magnet periodically cuts the generator stator 1-2 to generate pulse signals. The pulse signal can be used to judge the rotational speed of the turbine generator 1, and further obtain the displacement information. The control end at the wellhead changes the displacement by means of leaking or increasing the flow, which is used to realize the transmission of downlink information, allowing The hinged short section of the decoding circuit 11 is provided with a patch wire inside, which is used to realize the communication between the decoding circuit 11 and the jumper power line 7, or the decoding circuit 11 can be electrically connected with the electrical appliance 9 near the bottom of the well through a communication line, It is used to realize the communication between the decoding circuit 11 and the electrical appliances 9 near the bottom of the well.

A capacitor module is arranged in any hinged nipple in the series 2 of hinged nipples, and the capacitor nipple is provided with a capacitor nipple, and the capacitor nipple can temporarily store the electric energy generated by the turbine generator 1. It should be noted that the capacitor module It can greatly expand the performance of the bottom-hole self-power while drilling system, so that the bottom-hole self-power while drilling system can supply energy for near-bottom electrical devices that require powerful instantaneous power.

The pre-set deflection limit angle between the adjacent articulation sub-joints of the articulated sub-joint series 2 shall not be greater than 10°, and the length of the high-passability guide sub-joint 8 shall not exceed 5 times the average diameter of the articulated sub-joint. 2 The minimum distance between the deflection centers of the individual articulation sub joints shall not exceed 8 times the average diameter of the articulation sub joints.

The decoding circuit 11 is provided with a signal modulation circuit and a signal demodulation circuit adjacent to it, and the signal demodulation circuit is also provided adjacent to the near-bottom electrical appliance 9, and the signal modulation circuit can superimpose the signal to the jumper power line 7, and the signal demodulation circuit The modulation component superimposed on the jumper power line 7 can be picked up from the jumper power line 7. It should be noted that the decoding circuit 11 uses the bus communication method to communicate with the near-bottom electrical appliance 9 through the jumper power line 7. And the encoding method includes any one or a combination of interval code, FSK code, Manchester code, and Miller code, and a decoding method corresponding to encoding is used to implement decoding when receiving information.

A guide wheel is arranged above the turbine 1-1, and the guide wheel is fixedly connected with the hinged joint housing. The through structure 4 also includes a guide control module 41/411.

The operation steps of the present invention are:

When the system is used in open-hole wells, the highly flexible bottom-hole self-power-while-drilling system can realize sidetracking and complete short-radius lateral well drilling operations. The guide device includes an anchor and a guide. The anchor clamps the inner wall of the casing in the main wellbore A through slips, and fixes the slope of the guide towards a specific direction. The window opening operation is completed on the wall, and the highly flexible bottom hole self-power supply while drilling system is further run to realize the sidetracking of the ultra-short radius branch hole B, and through the turbine generator 1, turbine 1-1, stator 1-2, Rotor 1-3, articulated nipple series 2, torque transmission pin 2-1, torque transmission slot 2-2, joint 2-3, substation module 3, rectifier circuit 3-1, voltage regulator circuit 3-2, through Structure 4, steering control module 41/411, relay communication device 42, sub-section jumper transmission line 7, jumper transmission line 7, high-passability steering sub-section 8, and near-bottom electrical appliances 9 to ensure control. Power supply to complete short-radius lateral well drilling operations, so that the system can solve the problem that electrical appliances near the bottom of the well cannot effectively obtain power during drilling, logging or formation testing for short or extremely short radiuses.

The specific embodiments described above further describe the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above descriptions are only specific embodiments of the present invention, and are not intended to limit the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

A highly flexible bottom hole self-powering while drilling system, characterized in that it comprises an articulated pup joint series (2) and a turbine generator (1), wherein the turbine generator (1) is arranged on the articulated pup joint series (2). ) in any position close to the lower part, the near-bottom electrical appliance (9) is arranged at the lower end of the hinged pup joint series (2) or any position close to the lower part, and the near-bottom electrical appliance (9) power input end The turbine generator (1) is electrically connected to the power output terminal of the turbine generator (1) by means of a jumper transmission line (7) via the substation module (3) or directly to the turbine generator (1) by means of a jumper transmission line (7). A through structure (4) is provided along the axis direction of the hinged short joint series (2) arranged above the generator (1).
The highly flexible bottom hole self-powered while drilling system according to claim 1, characterized in that: the turbine generator (1) includes a rotor (1-3), a stator (1-2) and a turbine (1) inside -1), the stator (1-2) includes an iron core and a coil, the rotor (1-3) is sleeved on the outside of the stator (1-2), and the rotor (1-3) includes at least a pair of magnetic steels , the turbine (1-1) is arranged outside the rotor (1-3).
The highly flexible bottom-hole self-power-while-drilling system according to claim 1, characterized in that: the substation module (3) comprises a rectifier circuit (3-1) and a voltage stabilization circuit (3-2), The input end of the rectifier circuit (3-1) is electrically connected to the output end of the turbine generator (1), and the output end of the rectifier circuit (3-1) is electrically connected to the input end of the voltage stabilizing circuit (3-2), and the stabilizing circuit (3-2) input end is electrically connected. The output end of the pressure circuit (3-2) is electrically connected with the input end of the electrical appliance (9) near the bottom of the well.
The highly flexible bottom-hole self-power-while-drilling system according to claim 1, characterized in that: the maximum limit angle range of the sub joints between each of the articulated sub-section series (2) is 2°-10° , the length of the articulated short joint series (2) is greater than 9 meters, and the length of the articulated short joint series (2) is greater than the length of the short or extremely short radius branch well section and its extended well section.
The highly flexible bottom-hole self-powering while drilling system according to claim 1, characterized in that: the articulated sub-series (2) comprises a plurality of mutually drive-connected articulated subs, torque transmission pins (2-1) ), torque transmission grooves (2-2), joints (2-3) and seals, and the seals are arranged in the deflection gap stroke of the hinged pup joint series (2), and the seals are seal rings/through pressure bearing Tube/bellows seal tube.
The highly flexible bottom-hole self-power-while-drilling system according to claim 1, wherein the decoding circuit (11) and the flow velocity sensor arranged in the downhole form a downlink command solving module, and the decoding circuit (11) ) is electrically connected with a near-bottom electrical appliance (9) through a jumper transmission line (7), and the downhole flow rate sensor is a turbogenerator (1) rotational speed counting device, and the downlink instruction calculation module is based on the turbogenerator (1). ) to identify the downlink command.
The highly flexible bottom hole self-powered while drilling system according to claim 1, characterized in that: a capacitor module is arranged in any articulated short joint in the series of articulated short joints (2), and the capacitance module is arranged in the There is a capacitor sub-section, and the capacitor sub-section can temporarily store the electric energy generated by the turbine generator (1).
The highly flexible bottom-hole self-power-while-drilling system according to claim 1, characterized in that: the preset deflection limit angle between adjacent articulating sub-joints of the articulating sub-series (2) is not greater than 10 °, the length of the high-passability guide sub-section (8) does not exceed 5 times the average diameter of the articulation sub-sections, and the minimum value between the deflection centers of the articulating sub-sections in the articulating sub-section series (2) is the smallest The distance shall not exceed 8 times the average diameter of the articulated pup joints.
The highly flexible bottom hole self-powered while drilling system according to claim 6, characterized in that: the decoding circuit (11) is provided with a signal modulation circuit and a signal demodulation circuit adjacent to it, and the signal demodulation circuit is also adjacent to a signal demodulation circuit. Downhole electrical appliances (9) are provided, and the signal modulation circuit can superimpose the signal to the jumper transmission line (7), and the signal demodulation circuit can pick up and superimpose the jumper transmission line (7) from the jumper transmission line (7) ) in the modulation component.
The highly flexible bottom-hole self-power-while-drilling system according to claim 2, characterized in that: a guide wheel is provided above the turbine (1-1), and the guide wheel is fixedly connected to the hinged joint housing, and the The through structure (4) also includes a guide control module (41/411).