gyroscopic corrector

Abstract

The application provides a rotation measuring and correcting device. The rotation measuring and correcting device is arranged between an inner barrel (22) outside a drilling device and a wellbore casing (25), and comprises a mounting frame (20) provided with a cable (24), a rotation measuring mechanism and a rotation correcting mechanism. The rotation measuring mechanism is used for measuring a rotation angle of the mounting frame (20) relative to the wellbore casing (25), and the rotation correcting mechanism is used for correcting the mounting frame (20) according to the rotation angle measured by the rotation measuring mechanism. According to the rotation measuring and correcting device, cable winding of a moving drill string can be effectively avoided, the cable is effectively protected, and cable damage is avoided.

Description

Technical Field

[0001] This invention relates to the field of drilling equipment technology, and in particular to a rotation measuring and correction device. Background Technology

[0002] During bottom hole electric drilling, under certain conditions, the drill string may move, vibrate, or move eccentrically, or the mud may scour and drag the downhole annulus conductive cable close to the drill string. Since the drill string rotates and moves up and down during operation, the conductive cable may easily become entangled in the moving drill string when it gets close, resulting in cable damage.

[0003] Currently, there is no existing technology that can keep the downhole conductive cable away from the adjacent moving drill string and prevent the cable from getting tangled in the moving drill string. Summary of the Invention

[0004] The purpose of this invention is to provide a rotation measuring and correction device that can effectively prevent cables from getting tangled in the moving drill string, providing effective protection for the cables and preventing cable damage.

[0005] To address the aforementioned technical problems, as one aspect of the present invention, a rotation measuring and correction device is provided, which is disposed between the inner cylinder outside the drilling equipment and the well casing. The device includes a mounting frame, on which a cable, a rotation measuring mechanism, and a correction mechanism are disposed. The rotation measuring mechanism is used to measure the rotation angle of the mounting frame relative to the well casing, and the correction mechanism is used to correct the rotation of the mounting frame according to the rotation angle measured by the rotation measuring mechanism.

[0006] Preferably, the steering mechanism includes a steering motor and a steering wheel. The steering wheel is located at the output end of the steering motor and is pressed against the inner wall of the well casing. Under the driving action of the steering motor, the steering wheel interacts with the inner wall of the well casing, causing the mounting frame to rotate back to the initial position.

[0007] Preferably, the rotation measuring mechanism includes a rotation measuring motor and a rotation measuring wheel. The rotation measuring wheel is located at the input end of the rotation measuring motor, presses against the inner wall of the well casing, and interacts with the inner wall of the well casing under the rotation of the mounting frame, thereby driving the input shaft of the rotation measuring motor to rotate.

[0008] Preferably, the rotation ratio of the measuring wheel and the calibrating wheel is 1:1.

[0009] Preferably, the mounting bracket is capable of moving up and down relative to the well casing.

[0010] Preferably, both the measuring motor and the steering motor are located between the inner cylinder and the well casing, and the measuring motor and the steering motor are arranged at intervals along the circumference of the well casing.

[0011] Preferably, the measuring wheel and the calibrating wheel are located at opposite ends of the same diameter of the well casing.

[0012] Preferably, the mounting bracket is fixedly installed on the inner cylinder, and the mounting bracket is provided with a cable conduit, through which the cable is run.

[0013] Preferably, the guide wheel and the measuring wheel are provided with vertical teeth, which can slide up and down relative to the well casing, and adjacent vertical teeth are provided with guide chamfers at the upper and lower ends.

[0014] Preferably, the mounting frame is further provided with a temperature and pressure compensation cavity, a correction mechanism mounting cavity, and a measuring mechanism mounting cavity. A temperature and pressure compensation capsule is installed inside the temperature and pressure compensation cavity. The temperature and pressure compensation cavity is connected to the annular cavity between the inner cylinder and the well casing through a pressure transmission hole. The correction mechanism mounting cavity and the measuring mechanism mounting cavity are connected to the temperature and pressure compensation capsule through a pressure compensation transmission pipe.

[0015] The rotation measuring and adjusting device of this invention is installed between the inner cylinder of the drilling equipment and the well casing. It includes a mounting frame, on which a cable, a rotation measuring mechanism, and a adjusting mechanism are mounted. The rotation measuring mechanism measures the rotation angle of the mounting frame relative to the well casing, and the adjusting mechanism adjusts the mounting frame according to the measured rotation angle. This rotation measuring and adjusting device can detect the rotation angle of the cable mounting frame relative to the well casing in real time and adjust the mounting frame accordingly. This continuously adjusts the cable position back to its original position, effectively preventing cable damage caused by the cable wrapping around the moving drill string when the mounting frame rotates relative to the drill string. It ensures the cable maintains a reasonable distance from the drill string, effectively securing the cable in confined spaces and providing effective protection for the cable. Attached Figure Description

[0016] Figure 1 The schematic diagram illustrates a cross-sectional view of the rotation measuring and correction device according to an embodiment of the present invention;

[0017] Figure 2 The diagram illustrates a top view cross-sectional view of the rotation measuring and correction device according to an embodiment of the present invention.

[0018] The attached diagram shows the following reference numerals: 1. Rotation wheel; 2. Rotation drive shaft; 3. Rotation fixing box; 4. Bearing; 5. First data processor; 6. Rotation motor; 7. Motor base; 8. Data transmission processor; 9. Rotation signal line; 10. Temperature and pressure compensation capsule; 11. Pressure transmission hole; 12. Pressure compensation transmission tube; 13. Rotation measuring wheel; 14. Rotation measuring drive shaft; 15. Rotation measuring fixing box; 16. Rotation measuring sensor; 17. Power connection line; 18. Second data processor; 19. Rotation measuring motor; 20. Mounting bracket; 21. Rotation measuring signal line; 22. Inner cylinder; 23. Cable conduit; 24. Cable; 25. Well casing; 26. Drill pipe. Detailed Implementation

[0019] The embodiments of the present invention will be described in detail below, but the present invention can be implemented in many different ways as defined and covered by the claims.

[0020] Please refer to Figures 1 to 2 As shown in the embodiment of the present invention, a rotation measuring and adjusting device is disposed between the inner cylinder 22 and the well casing 25 on the outer side of the drilling equipment. The rotation measuring and adjusting device includes a mounting frame 20, on which a cable 24, a rotation measuring mechanism, and a adjusting mechanism are disposed. The rotation measuring mechanism is used to measure the rotation angle of the mounting frame 20 relative to the well casing 25, and the adjusting mechanism is used to adjust the rotation of the mounting frame 20 according to the rotation angle measured by the rotation measuring mechanism. The aforementioned drilling equipment refers to drill pipe 26 or drilling tools.

[0021] The rotation measuring and adjusting device of this application can detect the rotation angle of the cable 24 mounting bracket 20 relative to the well casing 25 in real time, and adjust the mounting bracket 20 according to the detected rotation angle, thereby continuously adjusting the position of the cable 24 back to the original position. This can effectively avoid the problem of cable 24 getting tangled in the moving drill string when the mounting bracket 20 rotates relative to the drill string, which would cause cable damage. This ensures that the cable 24 can always maintain a reasonable distance from the drill string, which can effectively fix the cable 24 in a confined space and effectively protect the cable 24.

[0022] The steering mechanism includes a steering motor 6 and a steering wheel 1. The steering wheel 1 is located at the output end of the steering motor 6 and presses against the inner wall of the well casing 25. Under the drive of the steering motor 6, the steering wheel 1 interacts with the inner wall of the well casing 25, causing the mounting frame 20 to rotate back to its initial position. After the rotation measuring mechanism measures the rotation angle of the mounting frame 20 relative to the well casing 25, the steering mechanism is used to correct the circumferential position of the mounting frame 20, so that the mounting frame 20 can return to its initial circumferential position. This allows the cable 24 located on the mounting frame 20 to return to its original position farthest from the drill string, preventing the cable 24 from getting tangled in the drill string. To ensure sufficient friction between the steering wheel 1 and the inner wall of the well casing 25, preventing slippage of the steering wheel 1 relative to the inner wall of the well casing 25, and ensuring accurate and reliable steering control of the steering wheel 1 relative to the mounting frame 20, preferably, the steering mechanism also includes an extension mechanism. The extension mechanism is located between the mounting seat of the steering motor 6 and the inner cylinder 22, and has an extension or retraction function. Through the extension action, the mounting seat of the steering motor 6 can be offset towards the well casing 25 to a certain extent, thereby ensuring that the steering wheel 1 can press firmly against the inner wall of the well casing 25. The extension mechanism is a hydraulic cylinder or other structure with telescopic function.

[0023] When the correction mechanism is working, the rotation measuring and correction device first obtains the rotation angle of the mounting frame 20 measured by the rotation measuring mechanism through the controller, and then converts it into the number of rotations of the correction wheel 1 through calculation. After that, the controller sends the required number of rotations of the correction wheel 1 to the correction motor 6, and controls the correction motor 6 to rotate the corresponding number of rotations. Since the well casing 25 is fixed, the rotation of the correction wheel 1 will be converted into the rotation of the mounting frame 20 relative to the well casing 25, so that the correction wheel 1 drives the mounting frame 20 to rotate back to the initial rotation position in the opposite direction of the previous rotation.

[0024] The rotation measuring mechanism includes a rotation measuring motor 19 and a rotation measuring wheel 13. The rotation measuring wheel 13 is located at the input end of the rotation measuring motor 19. The rotation measuring wheel 13 is pressed against the inner wall of the well casing 25 and interacts with the inner wall of the well casing 25 under the action of the rotating mounting bracket 20, driving the input shaft of the rotation measuring motor 19 to rotate. An extension mechanism can also be provided between the rotation measuring motor 19 and the inner cylinder 22 where the rotation measuring wheel 13 is located. Its function is to allow the rotation measuring wheel 13 to be offset towards the inner wall of the well casing 25, thereby ensuring that the rotation measuring wheel 13 can be pressed tightly against the inner wall of the well casing 25.

[0025] In this embodiment, the mounting frame 20 is also provided with multiple independent mounting cavities, including a measuring and rotating mechanism mounting cavity, a correcting mechanism mounting cavity, a processor mounting cavity, etc., wherein the measuring and rotating mechanism is installed in the measuring and rotating mechanism mounting cavity, and the correcting mechanism is installed in the correcting mechanism mounting cavity.

[0026] The rotation measuring mechanism also includes a bearing 4, a motor base 7, a rotation measuring transmission shaft 14, a rotation measuring fixing box 15, and a rotation measuring signal line 21. The bearing 4 is located inside the rotation measuring fixing box 15. The rotation measuring motor 19 is mounted on the motor base 7 inside the mounting cavity of the rotation measuring mechanism. The output shaft of the rotation measuring motor 19 is located on the bearing 4 and extends out from the mounting cavity of the rotation measuring mechanism of the mounting frame 20 through the bearing 4. The rotation measuring wheel 13 is located on the output shaft of the rotation measuring motor 19 and meshes with the inner wall of the well casing 25.

[0027] The correction mechanism also includes a correction drive shaft 2, a correction fixing box 3, a bearing 4, a motor base 7, and a correction signal line 9. The bearing 4 is set inside the correction fixing box 3. The correction motor 6 is installed on the motor base 7 inside the correction mechanism mounting cavity. The output shaft of the correction motor 6 is set on the bearing 4 and extends out from the correction mechanism mounting cavity of the mounting bracket 20 through the bearing 4. The correction wheel 1 is set on the output shaft of the correction motor 6 and meshes with the inner wall of the well casing 25.

[0028] The processor mounting cavity houses a first data processor 5, a data transmission processor 8, and a second data processor 18. The first data processor 5 and the data transmission processor 8 are integrated on a single circuit board. The steering motor 6 is electrically connected to this circuit board via a steering signal line, enabling data transmission between the first data processor 5 and the steering motor 6. The second data processor 18 is electrically connected to a rotation measuring motor 19 via a rotation measuring signal line 21, allowing for timely processing of the rotation data measured by the rotation measuring motor 19. The data transmission processor 8 enables data transmission between the first data processor 5 and the second data processor 18, facilitating the convenient and rapid conversion of rotation measuring data into steering data, thereby facilitating the steering control of the steering motor 6.

[0029] The rotation measuring and correction device also includes a power connection cable 17, which is connected to each processor and each motor respectively, for supplying power to each processor and each motor.

[0030] In this embodiment, the rotation ratio of the measuring wheel 13 and the calibrating wheel 1 is 1:1.

[0031] When the mounting frame 20 rotates relative to the inner wall of the well casing 25, the measuring wheel 13 drives the measuring motor 19 to rotate, and the measuring sensor 16 measures the rotation speed and rotation amount of the measuring wheel 13. After obtaining the rotation data, the measuring sensor 16 immediately processes it and sends a reverse command to the correction wheel 1 to rotate at the same speed and the same number of revolutions. The correction wheel 1 receives the command and operates accordingly. The power source for the measuring and correction rotation is the motor driven by the power supply cable. When the measured wheel 13 measures a cumulative rotation amount of zero, it returns to the standby measurement state. This device allows connection to the ground control system using a conductive cable and can receive and send signals to the ground control system regarding the rotation speed and rotation amount of the mounting frame 20, the correction speed, the number of correction revolutions, and the lag time. It can also select ground control electrical signals to intervene in the operation of the correction wheel 1's rotation speed and rotation amount, or select the downhole automatic measuring and correction mode.

[0032] The mounting bracket 20 can move up and down relative to the well casing 25. The rotation correction process of this rotation measuring and adjusting device is in dynamic equilibrium, allowing the mounting bracket 20 to move up and down along the inner wall of the well casing 25. It does not correct the amount or speed of vertical movement; it only measures and corrects the rotational speed and amount of rotation to keep the mounting bracket 20 from rotating relative to the well casing 25, allowing only vertical movement to prevent cable 24 from tangling. The rotation measuring and adjusting device allows parallel cable routing on its outer side to prevent cable tangling. The outer side of the device is equipped with tile-shaped mud flow channels to allow free flow of circulating mud.

[0033] Both the measuring motor 19 and the steering motor 6 are disposed between the inner cylinder 22 and the well casing 25, and are arranged at intervals along the circumference of the well casing 25. In this application, by arranging the steering motor 6 and the measuring motor 19 at intervals along the circumference of the inner cylinder 22, the motor arrangement can be made more reasonable, and the annular space between the inner cylinder 22 and the well casing 25 can be made more fully utilized. Therefore, the problem of limited space can be solved, and the space inside the well casing 25 can be made more fully utilized. In this embodiment, in order to further reduce the volume occupied by the steering mechanism and the measuring mechanism, both the steering motor 6 and the measuring motor 19 are small-diameter extended type motors.

[0034] The measuring wheel 13 and the aligning wheel 1 are located at the same two ends of the same diameter of the well casing 25, which allows the measuring wheel 13 and the aligning wheel 1 to be evenly arranged along the circumference of the well casing 25. This ensures that the mounting frame 20 is in a balanced state of force during the rotation of the measuring wheel 13 and the aligning wheel 1, making the structure more stable.

[0035] In this embodiment, the mounting bracket 20 is fixedly mounted on the inner cylinder 22, and a cable conduit 23 is provided on the mounting bracket 20, through which the cable 24 passes. The mounting bracket 20 is mounted on the inner cylinder 22, which facilitates the installation and fixation of the mounting bracket 20.

[0036] Vertical teeth are provided on the aligning wheel 1 and the measuring wheel 13, which can slide up and down relative to the well casing 25. Guide chamfers are provided at the upper and lower ends of adjacent vertical teeth. By forming guide chamfers between adjacent vertical teeth, it is convenient to install and fit between the aligning wheel 1, the measuring wheel 13 and the inner wall of the well casing 25, reducing the installation difficulty.

[0037] The mounting frame 20 is also provided with a temperature and pressure compensation chamber, a correction mechanism mounting chamber, and a measuring mechanism mounting chamber. The temperature and pressure compensation chamber is provided with a temperature and pressure compensation capsule 10. The temperature and pressure compensation chamber is connected to the annular cavity between the inner cylinder 22 and the well casing 25 through the pressure transmission hole 11. The correction mechanism mounting chamber and the measuring mechanism mounting chamber are connected to the temperature and pressure compensation capsule 10 through the pressure compensation transmission pipe 12.

[0038] Both the correction mechanism mounting cavity and the measuring mechanism mounting cavity are sealed spaces containing hydraulic oil. The temperature and pressure compensation cavity transmits the temperature and pressure within the annular cavity between the inner cylinder 22 and the well casing 25 to the temperature and pressure compensation cavity via the pressure transmission hole 11. When the temperature and pressure within the annular cavity are greater than the pressures within the correction mechanism mounting cavity and the measuring mechanism mounting cavity, the hydraulic oil within the temperature and pressure compensation capsule 10 in the temperature and pressure compensation cavity flows towards the correction mechanism mounting cavity and the measuring mechanism mounting cavity under the influence of the pressure and temperature within the annular cavity, until the pressure in the correction mechanism mounting cavity and the measuring mechanism mounting cavity is balanced with the pressure within the annular cavity. When the pressure within the annular cavity is less than the pressures within the correction mechanism mounting cavity and the measuring mechanism mounting cavity, the hydraulic oil in the correction mechanism mounting cavity and the measuring mechanism mounting cavity flows towards the temperature and pressure compensation capsule 10, until the pressure in the correction mechanism mounting cavity and the measuring mechanism mounting cavity is balanced with the pressure within the annular cavity. Temperature adjustment is controlled by the automatic expansion or contraction of the capsule under pressure, and the temperature regulation is related to the elasticity of the rubber material. By setting up a temperature and pressure compensation structure, the temperature and pressure inside the mounting cavity of the correction mechanism and the mounting cavity of the measuring mechanism are balanced with the temperature and pressure inside the annular cavity. This avoids structural instability caused by pressure imbalance inside and outside the mounting cavity of the correction mechanism and the mounting cavity of the measuring mechanism, and improves the working stability and reliability of the measuring and correction device.

[0039] In actual operation, depending on the actual needs of the site, several or more rotation measuring and correction devices may be connected in series at different depths. The spacing between the connections is determined according to the well conditions and the structure of the moving tubing at the location of cable 24.

[0040] When multiple rotation measuring and correction devices are used simultaneously downhole, the ground control systems of each device operate independently without interfering with each other.

[0041] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention can have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A rotary and correction device arranged between an inner barrel (22) located outside a drilling rig and a wellbore casing (25), characterized in that, The installation frame (20) is provided with a cable (24), a rotation measuring mechanism and a rotation correcting mechanism, the rotation measuring mechanism is used for measuring the rotation angle of the installation frame (20) relative to the wellbore casing (25), and the rotation correcting mechanism is used for correcting the rotation of the installation frame (20) according to the rotation angle measured by the rotation measuring mechanism, the installation frame (20) is fixedly installed on the inner cylinder (22), the installation frame (20) is provided with a cable penetrating pipe (23), and the cable (24) is arranged in the cable penetrating pipe (23); the rotation correcting mechanism comprises a rotation correcting motor (6) and a rotation correcting wheel (1), the rotation correcting wheel (1) is arranged at the output end of the rotation correcting motor (6), the rotation correcting wheel (1) is attached to the inner wall of the wellbore casing (25), and under the driving action of the rotation correcting motor (6), the rotation correcting wheel (1) interacts with the inner wall of the wellbore casing (25) to drive the installation frame (20) to rotate to the initial position; the rotation measuring mechanism comprises a rotation measuring motor (19) and a rotation measuring wheel (13), the rotation measuring wheel (13) is arranged at the input end of the rotation measuring motor (19), the rotation measuring wheel (13) is attached to the inner wall of the wellbore casing (25), and under the rotation action of the installation frame (20), the rotation measuring wheel (13) interacts with the inner wall of the wellbore casing (25) to drive the input shaft of the rotation measuring motor (19) to rotate.

2. The turn corrector according to claim 1, characterized in that The rotation ratio of the rotation measuring wheel (13) to the rotation correcting wheel (1) is 1:

1.

3. The turn corrector of claim 1, wherein, The installation frame (20) can move up and down relative to the wellbore casing (25).

4. The turn corrector of claim 1, wherein, The rotation measuring motor (19) and the rotation correcting motor (6) are arranged between the inner cylinder (22) and the wellbore casing (25), and the rotation measuring motor (19) and the rotation correcting motor (6) are arranged in a circumferential interval along the wellbore casing (25).

5. The turn corrector according to claim 4, characterized in that The rotation measuring wheel (13) and the rotation correcting wheel (1) are located at two ends of the same diameter of the wellbore casing (25).

6. The turn corrector of claim 1, wherein, The rotation correcting wheel (1) and the rotation measuring wheel (13) are provided with vertical teeth, the vertical teeth can slide up and down relative to the wellbore casing (25), and adjacent vertical teeth are provided with guide chamfers at the upper end and the lower end.

7. The turn corrector of claim 1, wherein, The installation frame (20) is further provided with a temperature and pressure compensation chamber, a rotation correcting mechanism mounting chamber and a rotation measuring mechanism mounting chamber, the temperature and pressure compensation chamber is provided with a temperature and pressure compensation capsule (10), the temperature and pressure compensation chamber is communicated with the annular cavity between the inner cylinder (22) and the wellbore casing (25) through a pressure transmission hole (11), and the rotation correcting mechanism mounting chamber and the rotation measuring mechanism mounting chamber are communicated with the temperature and pressure compensation capsule (10) through a pressure compensation pressure transmission pipe (12).

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