Device and method for undercutting tailpipe hanger controlled by ground sonar communication

Abstract

The invention discloses a drilling liner hanger back-off device and method controlled through ground sonar communication. The control method comprises the steps that 1, the upper end of the drilling liner hanger back-off device is connected with a drill rod, and the lower end of the drilling liner hanger back-off device is connected with a lifting pipe nipple which is connected with a drilling liner hanger; 2, a ground sonar transmitting transducer is arranged on the ground and is connected with a well mouth, a string obtained after connection is finished in the first step is put down into a drilling well, when the drilling liner hanger is located at an operation position, a shaft is filled with liquid, and a sound wave signal including a control command is sent to the underground throughthe ground sonar transmitting transducer; 3, after the drilling liner hanger back-off device receives the sound wave signal generated by the ground sonar transmitting transducer in the second step, back-off operation is conducted. By means of the technical scheme, the problems can be solved that in a traditional method, torque is difficultly transmitted to the connecting thread between the drill rod and the drilling liner hanger, so that the connection thread between the underground drill rod and the drilling liner hanger cannot be completely loosened while the ground rotation drill rod is inposition.

Description

technical field [0001] The invention relates to the technical field of oil and gas field drilling, in particular to an undercut device and method for a liner hanger controlled by ground sonar communication. Background technique [0002] The propagation of the vibration generated by the sounding body in the air or other substances is called sound wave. Sound waves propagate in all directions by means of various media. Sound waves are usually longitudinal waves, and there are also transverse waves. The particles where the sound waves go vibrate near the equilibrium position along the direction of propagation. The propagation of sound waves is essentially the transfer of energy in the medium. The acoustic signal can be converted between the acoustic signal and the electrical signal through the acoustic transducer. The electrical signal contains the information of the frequency, amplitude and change of the acoustic wave. The electrical signals converted by different acoustic wa...

AI Technical Summary

Problems solved by technology

The biggest problem with this method is that since the wellhead is several thousand meters away from the downhole liner hanger, it is difficult to accurately transmit the torque to the drill pipe and the liner hanger due to the elastic deformation of the drill pipe itself when the drill pipe is rotated on the ground. At the thread of the connection, it is often encountered that the rotating drill pipe on the ground is in place, but the thread connecting the downhole drill pipe and the liner hanger is not completely loosened, which will cause follow-up blind construction and even lead to downhole complex situations

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