WO2022194159A1 - Well logging device and method - Google Patents

Abstract

A well logging device and method. The well logging device comprises: a pup joint series (Y), a signal transceiving unit (4), a control unit and/or a signal acquisition unit (5), wherein the pup joint series (Y) comprises at least one transceiving pup joint (3), at least one bearing pup joint (2) and a plurality of transmission pup joints (1) that are connected to each other in a hinged manner. The signal transceiving unit (4) for transceiving stratum signals is arranged on the transceiving pup joint (3). The control unit and/or the signal acquisition unit (5) electrically connected to the signal transceiving unit are/is arranged on the bearing pup joint (2), the control unit is configured for controlling the signal transceiving unit (4) to transmit signals to the stratum, and the signal acquisition unit is configured for acquiring stratum signals received by the signal transceiving unit (4). The plurality of transmission pup joints (1) are configured for connecting to a high-passability pup joint series in series or configured for connecting to the transceiving pup joint and the bearing pup joint. The device and the method can guarantee that well logging operations in a high-curvature well section and an extended well section of the high-curvature well section are performed smoothly.

Description

Well logging device and method

Related applications

This application requires the Chinese invention patent submitted on March 16, 2021 with the application number 202110279665.0 and the patent name "logging device and method" and the Chinese invention patent submitted on April 16, 2021 with the application number 202110411541.3 and the patent name " The priority of the Chinese invention patent of "Signal Transmitting Device", all contents of the above patents are incorporated herein in their entirety.

technical field

The present application relates to the technical field of oil and gas exploration, and in particular, to a logging device and method.

Background technique

The detection of underground resources requires a large number of logging tools. The existing technology can perform well logging for vertical wells, inclined wells, and lateral wells. However, the existing logging tools or LWD tools cannot pass through high-curvature well sections or branch well sections with a curvature radius of less than 30 meters, especially through extremely short-radius well sections or extremely short-radius branch sections with a curvature radius of less than 10 meters Well section. This limits logging or logging while drilling operations in high-curvature boreholes, increases the difficulty of traversing, and hinders the evaluation of thin-bed resources or side-hole resources.

Contents of this application

The embodiment of the present application provides a logging device, which is used to ensure the smooth progress of the logging operation, improve the economic benefit, and reduce the operation difficulty of the construction well section. The device includes:

A sub-section string, a signal transceiver unit, a control unit and/or a signal acquisition unit, used for passing through a borehole with a curvature radius within a preset range;

The sub-section series includes: at least one transmitting and receiving sub-section and a plurality of transmitting sub-sections connected in a hinged manner;

The transceiving short section is provided with a signal transceiving unit for transceiving formation signals;

At least one short carrying section is used for accommodating the control unit and/or the signal acquisition unit, and the short carrying section is connected in series to any position in the series of short joints in a hinged manner, or the short carrying section is arranged at any position in the series. above the sub-section series, or, the carrying sub-section is arranged below the sub-section series;

The carrying short section is provided with a control unit and/or a signal acquisition unit, and the control unit and/or the signal acquisition unit are electrically connected with the signal transceiver unit by jumping the measurement line, when the control unit and/or the signal acquisition unit When the acquisition unit is a control unit, it is used to control the signal transceiver unit to transmit signals to the formation, and when the control unit and/or the signal acquisition unit is a signal acquisition unit, it is used to collect the formation signal received by the signal transceiver unit .

Optionally, the device further comprises: a drill string disposed above the sub-section series, for transporting the sub-section series into the wellbore;

The length of the sub-section series is greater than the length of the lateral well section of the wellbore, the lateral well section includes a high-curvature deflection well section and its extended well section, and the curvature radius range of the high-curvature deflection well section 0-60m.

Optionally, the carrying pup joints are connected in series in the pup joint series in a hinged manner, and the axial lengths of the transmitting and receiving pup joints, the carrying puppet joints, and the transmission puppet joints are all less than or equal to all the lengths of the axes. 5 times the outer diameter of the transmission subsection.

Optionally, the device further includes: a lower communication circuit, a jumper line, an upper communication circuit and a mud pulser that are electrically connected in sequence;

the lower communication circuit is electrically connected with the control unit and/or the signal acquisition unit;

The lower communication circuit is used to transmit the logging signal from the control unit and/or the signal acquisition unit to the upper communication circuit through the jumper line, and to the upper communication circuit through the upper communication circuit to the short section. Mud pulser above the tandem;

The mud pulser is used for sending the logging signal to the receiver at the wellhead through the drill string.

Optionally, the device further includes: a data storage unit, electrically connected to the signal acquisition unit, for storing the formation signals collected by the signal acquisition unit.

Optionally, the signal transceiver unit includes: at least two transceiver coils, which transmit and/or receive signals to the formation in the form of electromagnetic waves;

Each of the transceiver coils is arranged on a corresponding transceiver short section.

Optionally, the signal transceiving unit includes: at least two transducers, which transmit and/or receive signals to the formation in the form of sound waves;

Each of the transducers is disposed on a corresponding one of the transceiver subsections.

Optionally, the signal transceiving unit includes a radiation detection device or a radiation source;

When the signal transceiving unit is a receiving unit, the ray detection device is used to receive signals from the formation in the form of radioactive rays;

Or, when the signal transceiving unit is a transmitting unit, the radioactive source is used to transmit signals to the formation in the form of radioactive particles.

Optionally, the signal transceiving unit includes electrodes, which transmit and/or receive signals to the formation in the form of transmitting and receiving currents;

The logging device includes at least two of the signal transceiving units carrying electrodes.

Optionally, the device includes a plurality of the control units and/or signal acquisition units that are electrically connected to each other;

A plurality of the control units and/or signal acquisition units are used to coordinately control a plurality of signal transceiving units.

Optionally, the device further includes: an elastic member that runs through the series of short sections and is used to make the plurality of the transceiver short sections in a coaxial state.

Optionally, the device further includes: an attitude measurement unit, which is arranged on the transceiving sub-section and/or the bearing sub-section.

Optionally, the attitude measurement unit includes: at least one accelerometer and one magnetometer, the accelerometer and the magnetometer are arranged on the axis of the transceiver sub-section, and are used to measure the transceiver sub-section of inclination and azimuth.

Optionally, the control unit and/or the signal acquisition unit are prepared by using a thick film circuit process.

Optionally, in the series of short joints, the maximum deflectable angle between the axes of the two adjacent short When the dead center position of the structure is reached, the maximum deflectable angle is 2°-10°.

The embodiments of the present application also provide a logging method to ensure the smooth progress of logging operations, improve economic benefits, and reduce the difficulty of operation in construction well sections, the method comprising:

Passing a sub series with a logging function through a wellbore with a radius of curvature within a preset range, the sub series comprising: at least one transmitting and receiving sub and a plurality of transmitting subs that are connected in an articulated manner ;

Utilize the control unit and/or the signal acquisition unit on the bearing short section to control the signal transceiver unit to transmit signals to the formation;

The formation signal received by the signal transceiver unit is collected by the control unit and/or the signal collection unit.

In the embodiment of the present application, by setting a plurality of transmitting and receiving sub-sections, a plurality of carrying sub-sections and a plurality of transmission sub-sections that are connected in a hinged manner, it is ensured that the series of sub-sections can smoothly pass through the curvature radius within a preset range The wellbore inside ensures the smooth progress of subsequent logging operations, improves economic benefits, and reduces the difficulty of operation in the construction well section. By arranging a signal transceiver unit on the transceiver short section, it is possible to transmit and receive signals in the formation. By setting the control unit and/or the signal acquisition unit, the signal transceiver unit can be controlled to transmit signals to the formation, and the formation signals received by the signal transceiver unit can be collected, so as to ensure the smooth progress of the logging operation.

Description of drawings

In order to illustrate the technical solutions in the embodiments of the present application more clearly, the following briefly introduces the prior art and the drawings required in the embodiments. Obviously, the drawings in the following description are only some of the drawings in the present application. In the embodiments, for those of ordinary skill in the art, other drawings can also be obtained according to these drawings without any creative effort.

1 is a schematic structural diagram of a logging device in an embodiment of the application;

2 is a first partial schematic diagram of the logging device in the embodiment of the application;

3 is a second partial schematic diagram of the logging device in the embodiment of the application;

4 is a third partial schematic diagram of the logging device in the embodiment of the application;

5 is a fourth partial schematic diagram of the logging device in the embodiment of the application;

6 is a flowchart of a logging method in an embodiment of the present application;

7 is a schematic structural diagram of a signal transmitting apparatus in an embodiment of the present invention;

8 is a partial schematic diagram of a signal transmitting apparatus in an embodiment of the present invention;

9 is a partial schematic diagram of a signal transmitting apparatus in an embodiment of the present invention;

10 is a schematic structural diagram of a signal transmitting apparatus in an embodiment of the present invention;

11 is a partial schematic diagram of a signal transmitting apparatus in an embodiment of the present invention;

12 is a schematic structural diagram of a signal transmitting apparatus in an embodiment of the present invention;

FIG. 13 is a partial schematic diagram of a signal transmitting apparatus in an embodiment of the present invention.

The reference numbers are as follows:

1. Transmit short section;

2. Bearing short section;

3. Send and receive short sections;

4. Signal transceiver unit;

5. Signal acquisition unit;

6. Lower communication circuit;

7. Jumper lines;

8. Connect the communication circuit;

9. Mud pulser;

10. Jumper measurement line;

11. Tuning circuit;

12. Torque transmission structure;

13. Ball head;

14. Ball socket;

15. Torque transmission pin;

16. Torque transmission groove;

17. Elastic parts;

18. Insulation short section;

19. Conductive parts;

20. Power supply;

21. Flexible through insulation pipe;

22. Flexible jumper insulation pipe;

23. Inner wall insulating material;

24. Flexible insulating outer pipe;

25. Insulation material of outer wall;

26. Transmission line;

27. Drill equipment;

28. Power supply lines;

41. Scintillation crystal;

42. Photomultiplier tube;

43. Counting circuit;

44. Power supply circuit;

X, drill string;

Y, short section series.

Detailed ways

In order to make the purposes, technical solutions and advantages of the embodiments of the present application more clearly understood, the embodiments of the present application will be further described in detail below with reference to the accompanying drawings. Here, the exemplary embodiments and descriptions of the present application are used to explain the present application, but are not intended to limit the present application.

In the first aspect, an embodiment of the present application provides a logging device. As shown in FIG. 1 , the device includes: a sub-section string Y for passing through a wellbore with a curvature radius within a preset range, a signal transceiver unit 4. The control unit and/or the signal acquisition unit 5. Wherein, the sub-section series includes: at least one transceiver sub-section 3 and a plurality of transmission sub-sections 1 which are connected in a hinged manner. The transceiving short section 3 is provided with a signal transceiving unit 4 for transceiving formation signals. At least one short bearing joint 2 is used to accommodate the control unit and/or the signal acquisition unit 5, and the bearing short joint 2 is connected in series to any position in the short joint series Y in a hinged manner, or, the bearing short joint 2 is arranged on the short joint Above the series Y, or, the carrying sub-section 2 is arranged below the sub-section series Y. The carrying short section 2 is provided with a control unit and/or a signal acquisition unit 5, and the control unit and/or the signal acquisition unit 5 are electrically connected with the signal transceiver unit 4 by jumping the measurement line 10. When the control unit and/or the signal acquisition unit 5 When it is a control unit, it is used to control the signal transceiver unit 4 to transmit signals to the formation, and when the control unit and/or the signal acquisition unit 5 is a signal acquisition unit, it is used to collect the formation signal received by the signal transceiver unit 4 .

It should be noted that the wellbore includes a main wellbore and a branch well section, and the above-mentioned sub-section series Y, the signal transceiver unit 4, and the control unit and/or the signal acquisition unit 5 are used to pass through the radius of curvature within the preset range. Wellbore, which is used to pass through the main wellbore and the branch well section with the curvature radius within the preset range in sequence (mainly using the flexibility of the hinged structure to pass through the junction of the main wellbore and the branch well section, the junction For details, please refer to the separation curve between the main wellbore and the branch well section in Fig. 1).

When the carrying pegs 2 are connected in series in the puppet series Y in a hinged manner, the length of the carrying puppets 2 needs to be substantially the same as the length of the sending and receiving pegs 3 or the length of the transmission pegs 1 . When the short bearing joints 2 are arranged above the series Y of short joints, there is no limit to the length of the short bearing joints 2 .

During the specific operation, the plurality of transmitting and receiving sub-sections 3, the plurality of carrying sub-sections 2 and the plurality of transmitting sub-sections 1, which are connected in a hinged manner, are passed through a wellbore with a curvature radius within a preset range. The signal transceiving unit 4 on the transceiving short section 3 is used to transmit and receive formation signals. The control unit on the bearing sub 2 is used to control the signal transceiver unit 4 to transmit signals to the formation, and the signal acquisition unit 5 is used to collect the formation signal received by the signal transceiver unit 4 through the bridge measurement line 10. Specifically, when the control unit And/or when the signal acquisition unit 5 is a control unit, the signal transceiver unit 4 is controlled to transmit signals to the formation, and when the control unit and/or the signal acquisition unit 5 is a signal acquisition unit, the formation signal received by the signal transceiver unit 4 is collected. It should be noted that the sub-section series includes: a plurality of transmitting and receiving sub-sections 3 , a plurality of carrying sub-sections 2 and a plurality of transmission sub-sections 1 that are connected in a hinged manner. The transceiver sub-section 3, the carrying sub-section 2 and the transmission sub-section 1 can be connected according to the working needs. The end of the sub-section series Y can be connected to drilling equipment, and the head end can be connected to the mud pulser 9 at the wellhead. In order to ensure the logging effect, the transceiver sub-section 3 and the bearing sub-section 2 can be arranged in the branch well section near the bottom of the well. in,

In the logging device provided by the embodiment of the present application, by setting a plurality of transceiver sub-sections 3, a plurality of load-bearing sub-sections 2 and a plurality of transmission sub-sections 1 which are connected in a hinged manner, it is ensured that the sub-section series Y can be smoothly Passing through the wellbore with the curvature radius within the preset range ensures the smooth progress of subsequent logging operations, improves economic benefits, and reduces the difficulty of operation in the construction well section. By arranging the signal transceiving unit 4 on the transceiving short section 3, the transceiving of formation signals can be realized. By setting the control unit and/or the signal acquisition unit 5, the signal transceiver unit 4 can be controlled to transmit signals to the formation, and the formation signals received by the signal transceiver unit 4 can be collected to ensure the smooth progress of the logging operation.

Wherein, the functions of the plurality of transmission sub-sections 1 are to form the sub-section series Y in a serial manner or to connect a plurality of transceiver sub-sections 3 . The number of the transceiver sub-sections 3 is at least two, so as to form an array logging system, which can greatly improve the logging operation accuracy.

In addition, the logging device includes at least two of the control units and/or signal acquisition units 5 to coordinately control two or more signal transceiver units, and at least two of the control units and/or signal acquisition units 5 are electrically connected. It should be noted that, in order to ensure that the logging signal is not disturbed by vibration, the jumper measurement line 10 is fixed on the short section series Y through a fixing member.

In addition, the signal transceiver unit 4 and the control unit and/or the signal acquisition unit 5 are isolated and arranged in different short sections hinged to each other, and the electrical connection between the control unit and/or the signal acquisition unit and the signal transceiver unit is realized by bridging the measurement line 10. The connection greatly improves the passability of the logging device, and at the same time ensures the feasibility of the technology. The bending moment is isolated by means of articulation, so that the sensor on the transmission sub-section 1 is not easily damaged.

In the embodiment of the present application, it further includes: a drill string X, which is arranged above the sub-joint string Y and used to transport the sub-section string Y into the wellbore; the length of the sub-section string Y is longer than that of the lateral well length of the segment.

Wherein, the branch well section includes a high-curvature deflecting well section and its extended well section, and the curvature radius of the high-curvature deflecting well section ranges from 0 to 60 m. For example, it can be a short-radius well with a curvature radius of 10m-60m, or a very short-radius well with a curvature radius of 0-10m. The drill string X can be a high-rigidity drill string, which can be formed by serially connecting two drill pipes made of continuous steel pipes with threads. It should be noted that the purpose of the high-curvature deflection well section is to deviate the extension direction of the lateral wellbore from the main wellbore with as little footage as possible, so as to achieve the preset extension direction. Therefore, during the construction of short-to-extremely short-radius lateral wells, the curvature radius of the high-curvature deflecting well section is between 0 and 60 meters, but the extended well section is often the stable deviated well section. The purpose of the present application is to solve the problem that short-extremely short radius lateral wells cannot realize well logging, so the logging device must be able to pass through the high-curvature deflection well section.

In the application of lateral wells, the use of a drill string transmission logging device in the main wellbore can greatly reduce the length of the sub string Y and reduce the risk of accidents.

Further, the carrying pup joint 2 is connected in series in the pup joint series Y in a hinged manner, and the axial lengths of the sending and receiving pup joint 3, the carrying pup joint 2 and the transmission pup joint 1 are all less than or equal to the length of the outer diameter of the transmission pup joint 1. 5 times.

The signal transceiving unit 4 can transmit and receive acoustic signals, electrical signals, magnetic signals, radioactive rays or particles, and the like. For example, the signal transceiving unit 4 includes a radiation detection device. Among them, the radiation detection device is used to receive signals in the form of radioactive rays, and the radiation detection device is a combination of a scintillation crystal and a photomultiplier tube, which can detect gamma signals from the formation. The control unit and/or the signal acquisition unit 5 includes a counting circuit, which can record the electrical pulse information generated by the viewpoint multiplier tube.

As shown in FIG. 13 , the scintillation crystal 41 and the photomultiplier tube 42 are arranged in the signal transceiver unit 4 in combination, and the counting circuit 43 is arranged in the control unit and/or the signal acquisition unit 5 , and the photomultiplier tube and the counting circuit are connected across the The measurement circuit is electrically connected, and the signal transceiver unit 4 is separated from the control unit and/or the signal acquisition unit 5 by 1-3 hinge structures. The photomultiplier tube 42 is powered by a power supply circuit 44 .

The signal transceiving unit 4 includes: at least two transceiving coils, which transmit and/or receive signals to the formation in the form of electromagnetic waves, each transceiving coil is disposed on a corresponding transceiving short section 3 . As a more optimal configuration, a tuning circuit is also provided on the short carrying section 2, and the tuning circuit is used to drive the transceiver coil to transmit or receive electromagnetic waves. The tuning circuit can be a tuning circuit board, which at least includes a capacitor, which can form an oscillation circuit with a transmitting or receiving coil, and can excite electromagnetic waves. It should be noted that, since each transceiver coil is set on a corresponding transceiver subsection 3, and each two adjacent transceiver subsections 3 have a preset distance, by setting in this way, the array can be guaranteed The effect of logging, and then through the high-curvature wellbore to achieve array electromagnetic wave induction logging or array induction logging.

In the embodiment shown in FIG. 3 , the transceiver coil includes a magnetic conductor arranged coaxially with the drilling tool and a coil wound on the outer or inner side of the magnetic conductor. The coil is generally wound along the circumferential direction of the drill string for generating a surrounding The current field of the drill string.

In the embodiment shown in FIG. 12 , the transceiver coil includes a helical ring or a helical ring for generating a magnetic field around the drill string and a current along the axial direction of the drill string. In this embodiment, the current path drill bit along the axial direction of the drill string flows into the formation, and the control unit and/or the signal acquisition unit 5 can obtain the resistance of the formation by measuring the current or voltage. The smaller the current is, the specific analysis method is the prior art, which will not be repeated here.

The signal transceiving unit 4 includes: at least two transducers, which transmit and/or receive signals to the formation in the form of sound waves, and each transducer is arranged on a corresponding transceiving short section 3 . The best choice of transducer is piezoelectric ceramic or magnetostrictive transducer. When the signal transceiving unit 4 is used for acoustic logging, the signal transceiving unit 4 is a transducer and is used to transmit or receive acoustic signals. It is necessary to first send the articulated sub into the section to be logged, and during the reverse pulling process To achieve acoustic logging, the partial schematic diagram of the logging device at this time can be seen in FIG. 5 . At this time, the signal transceiver unit 4 in FIG. 5 is a transducer. It should be noted that, since each transducer is arranged on a corresponding transceiver sub-section 3, and each two adjacent transceiver sub-sections 3 have a preset distance, by setting in this way, it can be ensured that The effect of array logging is achieved, and then array acoustic logging is realized through a high-curvature wellbore, especially reflected acoustic logging is realized through a plurality of transceiver subsections 3 provided with transducers.

The signal transceiving unit 4 may comprise electrodes for transmitting and/or receiving signals to the formation in the form of transmitting and receiving currents, and the logging device comprises at least two signal transceiving units 4 carrying electrodes.

The control unit and/or the signal acquisition unit 5 may be a control circuit board and/or a signal acquisition circuit board. Based on the characteristics of low noise and high stability of the thick film circuit, the control unit and/or the signal acquisition unit 5 can be fabricated by using the thick film circuit process.

In the series Y of short joints, two adjacent short joints control the maximum deflectable angle between the axes of the two adjacent short joints through the structural dead point of the hinge structure. At the dead center position, the maximum deflectable angle is 2°-10°. It should be noted that the dead center position of the structure is the angular position at which the movable space of the input end and the output end of the hinged structure is exhausted. The larger the preset value of the maximum deflectable angle, the better the passability of the sub series Y, but the easier it is to buckling, so the preset value of the maximum deflectable angle can satisfy the curvature of the well section through which the tool may pass. .

In the embodiment of the present application, the hinge structure adopted between any two short joints may be a universal joint and a joint structure that can transmit axial force, for example, a universal joint that can transmit axial force, or any universal joint Combination with ball hinge. The universal energy saving of the cross shaft, which can not only transmit the axial force but also realize the universal transmission, is equivalent to the hinge joint.

Wherein, as shown in FIG. 1 and FIG. 3 , the joint structure includes: a ball head 13 and a ball socket 14 . A torque transmission structure 12 is also arranged between the ball head 13 and the ball socket 14 , and the ball head 13 can deflect in the ball socket 14 . It should be noted that the torque transmission structure 12 includes a torque transmission pin 15 and a torque transmission slot 16 , the torque transmission pin 15 is arranged on the outer side of the ball head 13 , and the torque transmission slot 16 is arranged at the inner side of the ball socket 14 , or, torque transmission The pin 15 is arranged on the inner side of the ball socket 14, and the torque transmission groove 16 is arranged on the outer side of the ball head 13; the torque transmission pin 15 can be spherical or cylindrical; in addition, the torque transmission structure 12 is not limited to the torque transmission pin 15 and the torque transmission groove 16. One form does not rule out the use of teeth, grooves, etc. to transmit torque.

In order to prevent the equipment connected to the head end of the sub-joint string from entering the branch well section when it is lowered, and thus sending jams and affecting the normal logging operation, the length of the sub-joint string can be set to be greater than the length of the branch well section.

In the embodiment of the present application, in order to ensure the smooth transmission of logging data to the uphole, as shown in FIG. 1 and FIG. 3 , the device further includes: a lower communication circuit 6 , a jumper circuit 7 , a lower communication circuit 6 electrically connected in sequence from bottom to top, Connect the communication circuit 8 and the mud pulser 9. Wherein, the lower communication circuit 6 is electrically connected with the control unit and/or the signal acquisition unit 5 . The lower communication circuit 6 is used to transmit the logging signal from the control unit and/or the signal acquisition unit 5 to the upper communication circuit 8 through the jumper line 7, and to the upper communication circuit 8 through the upper communication circuit 8. Mud Pulser 9. The mud pulser 9 is used to send the logging signal through the drill string X to the receiving end at the wellhead. It should be noted that "up" in this application refers to the direction of the wellhead, and "down" refers to the direction of the bottom of the well.

In specific implementation, the logging signal collected by the lower communication circuit 6 can be transmitted to the mud pulser 9 in the main wellbore through the jumper circuit 7 and the upper communication circuit 8, and the mud pulser 9 transmits the signal to the wellhead signal receiving end.

In order to complete the power supply and control of the downhole equipment, as shown in FIG. 1 and FIG. 4 , the device further includes: a power supply unit, which is arranged in the main wellbore and is electrically connected to the upper communication circuit 8 .

Wherein, the power supply unit can be connected in series to any position in the driving drill string, or connected to the upper end of the driving drill string.

Further, the lower communication circuit 6 includes a signal modulation circuit. The upper communication circuit 8 includes a signal demodulation circuit. Jumper lines 7 are used to transfer power and signals.

In specific implementation, the signal modulation circuit can load logging data into the jumper line 7 through the AC component; the signal demodulation circuit can separate the signal from the jumper line 7, and the signal modulation circuit modulates the sent information so that it can be easily superimposed to The form of the power supply signal, the circuit modulation method includes but is not limited to frequency modulation, amplitude modulation, phase modulation and pulse modulation, and the modulated signal is superimposed on the power supply signal in the jumper wire; the signal demodulation circuit is arranged in the short section series. Above or above, the demodulation circuit can pick up the information-carrying modulation component on the jumper line 7, and demodulate the picked-up modulation component according to the modulation method to form a digital signal that can be processed by the mud pulser. The mud pulser 9 further transmits the digital signal to the signal receiving end of the wellhead in the form of mud pulse wave.

In the embodiment of the present application, when the sub-sections need to be lifted up in series to obtain logging data, the device further includes: a data storage unit. The data storage unit is electrically connected with the signal acquisition unit 5 and is used for storing the formation signals acquired by the signal acquisition unit 5 .

Wherein, the data memory includes at least a memory chip.

In order to avoid the interference of vibration on the measurement and increase the service life of the jumper measurement line 10, the control unit and/or the signal acquisition unit 5 can be connected to the tuning circuit 11 through the jumper measurement line 10, and the jumper measurement line 10 is connected by a fixing part Fastened to the short section string, see Figures 1 and 2.

For example, in order to facilitate installation and removal, the jumper measurement line 10 may be fixed on the pup string by means of bolt assemblies.

Further, in order to improve the stability of the sub-section series in the branch well section, as shown in FIG. 1 and FIG. 3 , the device further includes: an elastic member 17 . The elastic member 17 runs through the sub-section series Y, and is used to make the plurality of transceiver sub-sections 3 in a coaxial state. Wherein, the elastic member 17 can be an elastic rod or an elastic tube or the like.

In the embodiment of the present application, the device further includes: an attitude measurement unit. The attitude measurement unit is arranged on the transceiving sub-section 3 and/or the carrying sub-section 2 .

Specifically, the attitude measurement unit includes: at least one accelerometer and one magnetometer, the accelerometer and the magnetometer are arranged on the axis of the transceiver sub-section 3, and are used to measure the inclination angle of the transceiver sub-section 3 and the Azimuth.

In specific implementation, the attitude measurement unit can measure the inclination angle and/or the gravity tool face angle and/or the magnetic tool face angle of the highly flexible logging instrument downhole, and can provide the azimuth logging equipment with the gravity tool face angle and/or Magnetic tool face angle information, the attitude measurement unit includes at least one magnetometer, and the bearing body is made of non-magnetic material. It can obtain the attitude of each transceiver unit, such as the orientation of the coil or antenna, obtain the orientation information of the transducer, and solve the measurement error caused by the uncertainty of the orientation of the coil or the transducer caused by the buckling of the sub-section array.

In order to avoid that two adjacent sub joints are long sub joints, it is difficult to cross the main wellbore and branch well sections. In the sub joint series, the distance between adjacent two sub joints can be Has a preset differential value. Wherein, the adjacent two sub-sections may be: the transceiver short section 3 and the carrying short section 2 , the carrying short section 2 and the transmission short section 1 , and the transceiver short section 3 and the transmission short section 1 .

Specifically, for example, the transmitting and receiving short section 3, the carrying short section 2 and the transmitting short section 1 are connected in sequence, and the length of the carrying short section 2 is 5m, then at this time, both the transmitting and receiving short section 3 and the transmitting short section 1 should be If the length is less than 5m, preferably, the length of the transmitting and receiving short section 3 and the transmitting short section 1 can be set to 3m-4m, that is, less than 80% of the length of the carrying short section 2 . The purpose of this setting is to ensure that the lengths of the two adjacent sub-sections with test functions are not long, so as to avoid affecting the normal use of the signal transceiver unit 4, the control unit and/or the signal acquisition unit 5 on the two sub-sections.

In the second aspect, an embodiment of the present application provides a method for logging by using the above logging device. As shown in FIG. 6 , the method includes:

Step 101: Pass a sub-section series with logging function through a wellbore with a curvature radius within a preset range, the sub-section series including: at least one transceiver sub-section and a plurality of sub-sections connected in a hinged manner. send short section;

Step 102, using the control unit and/or the signal acquisition unit on the bearing short section to control the signal transceiver unit to transmit signals to the formation;

Step 103: Use the control unit and/or the signal acquisition unit to collect the formation signal received by the signal transceiver unit.

By using the above method, it is ensured that the sub-section tandem Y can smoothly pass through the main wellbore and branch well sections with the curvature radius within the preset range, ensuring the smooth progress of subsequent logging operations, improving economic benefits and reducing the construction well section. job difficulty.

According to an embodiment of this document, as shown in FIG. 7 and FIG. 11 , the short section series Y includes: at least one insulating short section 18 and a jumper line 7 , and the insulating short section 18 is provided with an inner insulating layer, an outer an insulating layer and an insulating cross section, the insulating cross section is respectively connected to the inner insulating layer and the outer insulating layer in an insulating manner, and the insulating short section 18 is used to realize the insulation between the transmission short sections on both sides of the insulating cross section;

An insulating layer is provided on the jumper measurement line 10;

The control unit is arranged on any transmission sub-section 1 on one side of the insulation section, and is electrically connected to the transmission sub-section 1 on the other side of the insulation section through the jumper line 7. The control unit is used to make A potential difference or potential difference is generated between the transmission sub-sections 1 on both sides of the insulating section, and an electrical signal is emitted to the formation.

It should be noted that the wellbore includes a main wellbore and a branch well section, and the above-mentioned sub-section series Y is used to pass through a wellbore with a curvature radius within a preset range, that is, it is used to sequentially pass through the curvature radius within the preset range. The main wellbore and the branch well section (mainly using the flexibility of the hinge structure to pass through the junction of the main wellbore and the branch well section, the specific junction can be seen in Figure 7 between the main wellbore and the branch well section. at the separation curve).

It should be noted that the jumper line 7 in this embodiment can be used as a communication line, a measurement line or a power supply line. When the jumper line 7 is used as a measurement line, the jumper line 7 and the jumper line 7 The function of the measurement line 10 is the same.

During the specific operation, the sub-section series Y connected in an articulated manner passes through a wellbore with a radius of curvature within a preset range. The control unit is used to generate a potential difference between the transmission sub-sections 1 on both sides of the insulating sub-section 18, and then an electrical signal transmitted to the formation is formed through the potential difference, so as to realize the transmission of the downhole signal. Wherein, the plurality of short transmission sections 1 and the plurality of short insulation sections 18 may be alternately connected, that is, at least one short transmission section 1 is respectively provided on both sides of one short insulation section 18 .

In the signal transmitting device provided by the embodiment of the present invention, by setting a plurality of transmission sub-sections 1 and at least one insulating sub-section 18 connected in an articulated manner, it is ensured that the sub-section series Y can smoothly pass through the radius of curvature within a preset range. The wellbore ensures the smooth progress of subsequent logging operations, improves economic benefits, and reduces the difficulty of operation in the construction well section. By arranging an insulating layer on the jumper line 7, the jumper line itself can be protected from leaking current into the drilling fluid, thereby interfering with electrical signals. By arranging the control unit on the transmission sub-section 1 on one side of the insulation sub-section 18, and connecting with the transmission sub-section 1 on the other side of the insulation sub-section 18 through the jumper line 7, the transmission short-circuit on both sides of the insulation section can be shortened. A potential difference or potential difference is generated between the nodes 1, thereby realizing the transmission of downhole electrical signals.

Wherein, at least two of the insulating short sections 18 are formed with insulating sections, and the length of the insulating sections is 0.2m-2m. The insulating short section 18 includes at least insulating threads, which can form an insulating section. It should be noted that when it is used for communication, the signal transmitting device of the present invention needs to generate a strong electric pulse or inject a strong current into the formation in a short time. Therefore, the length of the insulating section is optimal between 0.5 and 2 meters. Less than 0.5 meters can not achieve good insulation effect, more than 2 meters, the effect is not obvious, and the cost is increased. In addition, when the present invention is applied to communication to the wellhead or to the ground, a matching ground receiving antenna is required, and the matching ground receiving antenna and interpretation technology are the prior art.

The jumper line 7 includes a high-voltage insulating layer, and the withstand voltage value of the high-voltage insulating layer is greater than 220V, which is used to protect the conductive material in the jumper line to transmit high-voltage current.

In the embodiment of the present invention, in order to ensure the insulating performance of the insulating short section 18, as shown in FIG. 8, FIG. 9 and FIG. 10, the inner insulating layer of the insulating short section 18 includes any one or combination of the following:

The flexible through insulating tube 21, the flexible bridging insulating tube 22 and the inner wall insulating material 23, wherein the flexible through insulating tube 21 is made of insulating material or insulation is provided on the inner wall of the flexible through insulating tube 21; the flexible bridging insulating tube 22 is made of insulating material The material is made of material or an insulating layer is provided on the inner wall of the flexible bridging insulating pipe 22 .

As shown in FIG. 9 , the outer insulating layer of the insulating short section 18 includes: a flexible insulating outer pipe 24 and/or an outer wall insulating material 25 .

Specifically, for example, the inner wall insulating material 23 and the outer wall insulating material 25 may be rubber, plastic, glass, or the like.

As an implementation manner, as shown in FIG. 9 , the inner insulating layer of the insulating short section 18 includes: a flexible through-insulating tube 21 and an inner wall insulating material 23 , and the flexible through-insulating tube 21 runs through the series Y of short sections for making A plurality of the insulating sub-sections 18 are in a coaxial state.

As another implementation, as shown in FIG. 8 , the inner insulating layer of the insulating short section 18 includes: a flexible jumper insulating tube 22 and an inner wall insulating material 23 , and the inner walls of the two adjacent insulating short sections 18 pass through the flexible jumper 22 and the inner wall insulating material 23 . Connect to insulating tube 22.

Specifically, insulating material is provided on the outer wall of the transmission sub-section 1 and/or the power carrying sub-section between two adjacent insulation sub-sections 18, and the transmission sub-section between the two adjacent insulation sub-sections 18 is A flexible insulating outer pipe 24 is arranged between the short joint 1;

A flexible through-insulating pipe 21 is arranged inside the transmission sub-section 1 between two adjacent insulation sub-sections 18, or, the transmission sub-section 1 between two adjacent insulation sub-sections 18 and/or the inner wall of the power-carrying sub-section An insulating material is provided, and a flexible jumper insulating tube 22 is provided between the transmission sub-sections 1 between two adjacent insulation sub-sections 18 .

The control unit can be a control circuit, which can also be connected with the drill bit equipment 27 through the signal transmission line 26 to control the drill bit equipment 27 and complete the downhole drilling operation, see FIGS. 7 and 8 .

In order to improve the receiving efficiency of the signal transmitted by the control unit, a helical ring is arranged at any position in the sub string Y or the drill string X, and the helical ring is used to receive the signal transmitted by the control unit.

In the embodiment of the present invention, it further includes: a drill string X, which is arranged above the sub-joint string Y, and is used to transport the sub-section string Y into the wellbore; the length of the sub-section string Y is longer than that of the lateral well length of the segment.

Wherein, the radius of curvature of the branch well section is in the range of 0-60m. For example, it can be a short-radius well with a curvature radius of 10m-60m, or a very short-radius well with a curvature radius of 0-10m. The drill string X can be a high-rigidity drill string, which can be formed by serially connecting two drill pipes made of continuous steel pipes with threads.

In order to further ensure that the transmission sub 1 and the insulation sub 18 can be smoothly transmitted to the bottom of the well, the axial length of the transmission sub 1 and the insulation sub 18 can be set to be less than or equal to 5 times the outer diameter of the drill string X.

In the embodiment of the present invention, as shown in FIG. 7 , the signal transmitting device further includes: at least one circuit-carrying short section 2 , and the circuit-carrying short section 2 is connected in series in the short section series Y in a hinged manner. The control unit is arranged inside the circuit carrying nipple 2 , and is electrically connected to the upper and lower parts of the insulating nipple 18 through the jumper line 7 or the conductive member 19 to generate a potential difference on both sides of the insulating nipple 18 .

Among them, the control unit includes a switch tube, which can release the electric energy stored in the high-voltage power supply according to the preset command (refer to FIG. 7 ), and the electric energy is used to excite the potential difference between the two sides of the insulating short section 18. The high-voltage power supply is a capacitor or a voltage circuit, or, the capacitor can also be charged by a boost power supply, and the switch tube directly uses the high-voltage power in the capacitor. The high voltage power supply voltage is generally between 500-3000V, generally preferably 1000-2000V. The signal transmitting device in the present invention can be a downhole flexible antenna, especially a downhole flexible dipole antenna. The specific driving method of the control unit and the high-voltage power supply to the dipole antenna belongs to the prior art. In EM-MWD technology and low-frequency electromagnetic communication There are a large number of records in the relevant documents of the technology, which will not be repeated in the present invention.

In order to ensure the insulation effect between the two adjacent insulation short sections 18 , insulating materials are provided on the outer walls of the transmission subsection 1 and/or the power supply subsection between the two adjacent insulation subsections 18 .

It should be noted that, the insulating material on the outer wall of the transmission sub-section 1 and/or the power-carrying sub-section between two adjacent insulating sub-sections 18 may be the insulating material directly grown on the surface of the sub-section by chemical methods, or sprayed Insulating material 25 on the outer wall of the subsurface.

In the embodiment of the present invention, as shown in FIG. 7 , the signal emitting device further includes at least one power supply carrying short section, which is connected in series in the short section series Y in a hinged manner. A power supply 20 is provided on the power carrying pup for supplying power to the control unit.

In addition, the power supply 20 can also be connected to the above-mentioned high-voltage power supply through the power supply line 28, so as to realize the power supply to the high-voltage power supply, see FIG. 7 , FIG. 8 and FIG. 9 . In this way, by setting the power supply 20, the power supply to the control unit and the high-voltage power supply is realized, and the subsequent operation is ensured smoothly.

In the embodiment of the present invention, the hinge structure adopted between any two short joints may be a universal joint capable of transmitting axial force and a joint structure, for example, a universal joint capable of transmitting axial force, or any universal joint Combination with ball hinge. The universal energy saving of the cross shaft, which can not only transmit the axial force but also realize the universal transmission, is equivalent to the hinge joint.

Wherein, as shown in FIG. 7 , the joint structure includes: a ball head 13 and a ball socket 14 . A torque transmission structure 12 is also arranged between the ball head 13 and the ball socket 14 , and the ball head 13 can deflect in the ball socket 14 . It should be noted that the torque transmission structure 12 includes a torque transmission pin 15 and a torque transmission slot 16 , the torque transmission pin 15 is arranged on the outer side of the ball head 13 , and the torque transmission slot 16 is arranged at the inner side of the ball socket 14 , or, torque transmission The pin 15 is arranged on the inner side of the ball socket 14, and the torque transmission groove 16 is arranged on the outer side of the ball head 13; the torque transmission pin 15 can be spherical or cylindrical; in addition, the torque transmission structure 12 is not limited to the torque transmission pin 15 and the torque transmission groove 16. One form does not rule out the use of teeth, grooves, etc. to transmit torque.

To sum up, the present invention ensures that the series Y of sub-sections can smoothly pass through the wellbore with the radius of curvature within the preset range by arranging the plurality of transmission sub-sections 1 and the plurality of insulation sub-sections 18 which are connected in a hinged manner. It ensures the smooth progress of subsequent logging operations, improves economic benefits, and reduces the difficulty of operation in the construction well section. By arranging the control unit on the transmission sub-section 1 on one side of the insulation sub-section 18, and connecting with the transmission sub-section 1 on the other side of the insulation sub-section 18 through the jumper line 7, it is ensured that two adjacent transmission sub-sections are A potential difference is generated between the nodes 1 for transmitting electrical signals to the formation, thereby realizing the transmission of downhole electrical signals.

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

Claims (27)

1. A logging device, characterized in that it comprises: a sub-section string (Y) for passing through a borehole with a curvature radius within a preset range, a signal transceiving unit (4), and a control unit and/or signal acquisition unit(5);

   The sub-section series comprises: at least one transceiver sub-section (3) and a plurality of transmission sub-sections (1) connected in a hinged manner;

   The transceiver short section (3) is provided with a signal transceiver unit (4) for transmitting and receiving formation signals;

   At least one short carrying section (2) is used for accommodating the control unit and/or the signal acquisition unit (5), and the carrying short section (2) is connected in series with any of the short section series (Y) in a hinged manner. Position, or, the carrying pup joints (2) are arranged above the pup joint series (Y), or, the carrying pup joints (2) are arranged below the pup joint series (Y);

   The carrying short section (2) is provided with a control unit and/or a signal acquisition unit (5), and the control unit and/or the signal acquisition unit (5) communicates with the signal transceiver unit by bridging the measurement line (10). (4) Electrical connection, when the control unit and/or the signal acquisition unit (5) is a control unit, it is used to control the signal transceiver unit (4) to transmit signals to the formation, when the control unit and/or the signal acquisition unit (5) is a control unit When the acquisition unit (5) is a signal acquisition unit, it is used to acquire the formation signal received by the signal transceiver unit (4).
2. The logging device according to claim 1, characterized in that it further comprises: a drill string (X), arranged above the sub-section series (Y), for conveying the sub-section series (Y) into the wellbore;

   The length of the sub-section series (Y) is greater than the length of the lateral well section of the wellbore, the lateral well section includes a high-curvature deflection section and its extended well section, and the curvature radius of the high-curvature deflection section The range is 0-60m.
3. The logging device according to claim 2, characterized in that, the short carrying joints (2) are connected in series in the series of short joints (Y) in a hinged manner, and the transmitting and receiving short joints (3) , The length of the axis of the short carrying section (2) and the short transmission section (1) are both less than or equal to 5 times the outer diameter of the short transmission section (1).
4. The logging device according to claim 2, further comprising: a lower communication circuit (6), a jumper line (7), an upper communication circuit (8) and a mud pulse electrically connected in sequence from bottom to top device (9);

   The lower communication circuit (6) is electrically connected with the control unit and/or the signal acquisition unit (5);

   The lower communication circuit (6) is used to transmit the logging signal from the control unit and/or the signal acquisition unit (5) to the upper communication circuit (8) through the jumper line (7), and It is transmitted to the mud pulser (9) arranged above the short section series (Y) through the upper communication circuit (8);

   The mud pulser (9) is used for sending logging signals to the receiving end at the wellhead through the drill string (X).
5. The logging device according to claim 1, further comprising: a data storage unit, electrically connected to the signal acquisition unit (5), for storing the formation signals collected by the signal acquisition unit (5).
6. The logging device according to claim 1, characterized in that, the signal transceiver unit (4) comprises: at least two transceiver coils, which transmit and/or receive signals to the formation in the form of electromagnetic waves;

   Each of the transceiver coils is arranged on a corresponding transceiver short section (3).
7. The logging device according to claim 1, characterized in that, the signal transceiving unit (4) comprises: at least two transducers, which transmit and/or receive signals to the formation in the form of sound waves;

   Each of the transducers is arranged on a corresponding one of the transceiver subsections (3).
8. The logging device according to claim 1, characterized in that, the signal transceiving unit (4) comprises a ray detection device or a radioactive source;

   When the signal transceiving unit is a ray detection device, the ray detection device is used for receiving formation signals in the form of radioactive rays;

   Or, when the signal transceiving unit is a ray transmitting device, the radioactive source is used to transmit signals to the formation in the form of radioactive particles.
9. The logging device according to claim 1, characterized in that, the signal transceiving unit (4) comprises electrodes, which transmit and/or receive signals to the formation in the form of transmitting and receiving currents;

   The logging device comprises at least two of the signal transceiving units (4) carrying electrodes.
10. The logging device according to claim 1, characterized in that it comprises a plurality of said control units and/or signal acquisition units (5) which are electrically connected to each other;

    A plurality of the control units and/or signal acquisition units (5) are used to coordinately control the plurality of signal transceiving units (4).
11. The logging device according to claim 1, characterized in that it further comprises: an elastic member (17), which runs through the sub-section series (Y), and is used to make a plurality of the transceiver sub-sections (3) ) in the coaxial state.
12. The logging device according to claim 1, characterized in that, further comprising: an attitude measurement unit, which is arranged on the transceiving sub-section (3) and/or the carrying sub-section (2).
13. The logging device according to claim 12, characterized in that, the attitude measurement unit comprises: at least one accelerometer and one magnetometer, and the accelerometer and the magnetometer are arranged at the transceiver sub-section (3). ) is used to measure the inclination angle and azimuth angle of the transceiver sub-section (3).
14. The logging device according to claim 1, characterized in that, the control unit and/or the signal acquisition unit (5) are fabricated by using a thick film circuit process.
15. The logging device according to claim 1, characterized in that, in the sub-joint series (Y), two adjacent sub-sections control the distance between the axes of the adjacent two sub-sections through the structural dead point of the hinged structure. The maximum deflectable angle between the two adjacent short sections is 2°-10° when the space between two adjacent short sections reaches the dead center position of the structure.
16. A method for logging using the logging device according to any one of claims 1-15, wherein the method comprises:

    Passing a sub string (Y) with logging function through a wellbore with a radius of curvature within a preset range, the sub string comprising: at least one transceiver sub (3) connected in a hinged manner and multiple delivery subsections (1);

    Utilize the control unit and/or the signal acquisition unit (5) on the bearing short section (2) to control the signal transceiver unit (4) to transmit signals to the formation;

    The formation signal received by the signal transceiver unit (4) is collected by the control unit and/or the signal collection unit (5).
17. The logging device according to claim 1, characterized in that, the nipple series (Y) comprises: at least one insulating nipple (18) and a jumper line (7), the insulating nipple (18) An inner insulating layer, an outer insulating layer and an insulating section are provided, and the insulating section is respectively connected to the inner insulating layer and the outer insulating layer in an insulating manner, and the insulating short section (18) is used to realize the two sides of the insulating section. The insulation between the transmission sub-sections;

    An insulating layer is provided on the jumper measurement line (10);

    The control unit is arranged on any transmission short section (1) on one side of the insulation section, and is electrically connected to the transmission short section (1) on the other side of the insulation section through the jumper line (7), so The control unit is used to generate a potential difference or a potential difference between the transmission sub-sections (1) on both sides of the insulating section, so as to transmit electrical signals to the formation.
18. The logging device according to claim 17, characterized in that, the length of the sub-section series (Y) is greater than the length of the lateral well section of the wellbore, and the curvature radius of the lateral well section is less than 30m.
19. The device according to claim 18, characterized in that the axial lengths of the transmission sub-section (1) and the insulation sub-section (18) are both less than or equal to 5 times the outer diameter of the sub-section series (Y) times.
20. The logging device according to claim 17, characterized in that, the control unit is electrically connected to the upper and lower parts of the insulating sub-section (18) through the jumper line (7) or the conductive member (19);

    The control unit at least includes a switch tube, and the control unit is used to generate a periodic potential difference or a potential difference between the transmission sub-sections on both sides of the insulating section, so as to transmit electrical signals to the formation.
21. The device according to claim 17, characterized in that it further comprises at least one power-carrying nipple, connected in series in the nipple series (Y) in a hinged manner;

    A power supply (20) is provided on the power supply carrying short section for supplying power to the control unit.
22. 18. Device according to claim 17, characterized in that at least two of the insulating sub-sections (18) are formed with insulating sections, the length of which is 0.2m-2m.
23. The device according to claim 21, characterized in that, the inner insulating layer of the insulating short joint (18) comprises a flexible through-insulating pipe (21), a flexible jumping insulating pipe (22) and an inner wall insulating material (23). any one or combination of;

    The outer insulating layer of the insulating short joint (18) includes: a flexible insulating outer pipe (24) and/or an outer wall insulating material (25).
24. The device according to claim 23, characterized in that an insulation is provided on the outer wall of the transmission sub-section (1) and/or the power-carrying sub-section between two adjacent insulation sub-sections (18). material, and the flexible insulating outer pipe (24) is arranged between two adjacent insulating sub-sections (18) and the transmission sub-section (1) between the two;

    The flexible through-insulating pipe (21) is provided inside the transmission sub-section (1) between two adjacent insulation sub-sections (18), or, two adjacent insulation sub-sections (18) Insulation material is provided on the inner wall of the transmission subsection (1) and/or the power supply subsection between the two adjacent insulation subsections (18), and the transmission subsection (1) between the two adjacent insulation subsections (18). The flexible jumper insulating pipe (22) is arranged between them.
25. The device according to claim 23, characterized in that, the inner insulating layer of the insulating short joint (18) comprises: the flexible through-insulating pipe (21) and the inner wall insulating material (23);

    The flexible through-insulating pipe (21) is inserted through the short-section series (Y), and is used for making the plurality of the insulating short-sections (18) in a coaxial state.
26. The device according to claim 23, characterized in that, the inner insulating layer of the insulating short joint (18) comprises: the flexible jumper insulating pipe (22) and the inner wall insulating material (23);

    The inner walls of the two adjacent insulating short joints (18) are connected by the flexible bridging insulating pipe (22).
27. The device according to claim 1 or 17, characterized in that it further comprises: a drill string (X), arranged above the sub-section series (Y), for conveying the sub-section series (Y) into the wellbore;

    A helical ring is arranged at any position in the sub-section series (Y) or the drill string (X), and the helical ring is used for receiving the signal transmitted by the control unit.

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