Magnetic field controllable drill bit magnetic connector and usage method thereof

Abstract

The invention discloses a magnetic field controllable drill bit magnetic connector. The magnetic field controllable drill bit magnetic connector comprises a cylindrical non-magnetic rigid body, a vibration sensor, a central processing circuit, a solenoid and a power supply battery, wherein the non-magnetic rigid body is provided with an axial through hole and connected between a drill bit and a screw motor; the vibration sensor, the central processing circuit and the battery are all fixed in a sealed cavity in the non-magnetic rigid body, and an output end of the vibration sensor is connectedwith an input end of the central processing circuit; the solenoid is buried in the non-magnetic rigid body and an axis of the solenoid is perpendicular to the axis of the non-magnetic rigid body. Theinvention also provides a usage method of the magnetic connector at the same time. With the magnetic field controllable drill bit magnetic connector and the usage method thereof, a magnetic field of the solenoid can be adjusted according to distance between the magnetic connector and a target point, under the premise of avoiding that a magnetic sensor reaches magnetic saturation, intensity of themagnetic field is increased as much as possible, thus, locating accuracy of the drill bit is improved effectively, and normal proceeding of construction is guaranteed.

Description

technical field [0001] The invention relates to a magnetic joint with the function of measuring the azimuth and vertex angle of a drill bit and variable magnetic field strength and a method for using the same, belonging to the technical field of drilling into soil layers or rocks. Background technique [0002] In the process of geological and oil drilling, sometimes the ultimate goal of drilling is the completed target well. In order to precisely control the trajectory of the wellbore and make it reach the designated target point, it is often necessary to use instruments to monitor the position, attitude (including azimuth) of the drill bit. Angle, top angle, etc.) parameters for downhole measurement. Rotating magnetic measurement is a high-precision measurement method. The basic principle of measuring position is to form a regular magnetic field disturbance in space by rotating an artificial magnetic field with known strength. The probe installed at the target point receive...

AI Technical Summary

Problems solved by technology

At present, these parameters are estimated by engineers based on the measured data and drilling tool performance, rather than actual measurement, which will easily lead to distortion of parameters, and then affect the final positioning accuracy

[0005] In addition, the current magnetic connector can only be used for transmitting signals, and cannot measure other parameters, with a single function

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