Automatic bit feed system and control method based on drilling pressure of shaft bottom

Abstract

The invention relates to an automatic bit feed system and a control method thereof based on the drilling pressure of a shaft bottom. The system comprises a crown block and a large hook positioned at the lower part of the crown block. The crown block and the large hook are connected through a steel wire rope. A water faucet is arranged below the large hook. The water faucet and a drill pipe are connected through a square kelly. One end of the steel wire rope is connected with a winch, and the other end of the steel wire rope is fixed on the ground. The winch is connected with a differential mechanism with a motor. A displacement sensor is arranged on the winch. A large hook load sensor is arranged on the large hook. A dead rope sensor is arranged on the steel wire rope. The large hook loadsensor, the dead rope sensor and the displacement sensor transmit the detected information to a signal amplifier. The signal amplifier is connected with a signal collector. A driller wing-room computer receives the information, performs signal processing, and calculates the to-be-input target drilling pressure of the ground according to a given drilling pressure of the shaft bottom. The driller wing-room computer controls and regulates the rotating speed of the winch by controlling the differential mechanism with the motor. As a result, the drilling pressure of the shaft bottom can be accurately controlled, and the automatic bit feeding is realized by the adoption of the automatic bit feed system based on the drilling pressure of the shaft bottom.

Description

technical field [0001] The invention relates to the field of drill feeding systems of oil drilling rigs, in particular to an automatic drill feeding system and a control method based on bottom-hole drilling pressure. Background technique [0002] In the field of oil and gas drilling, the performance of the drill bit is mainly judged by the ROP, and the bottom hole pressure is the main parameter affecting the ROP. Therefore, in order to optimize the drilling speed of the drill bit, reduce the wear of the drill bit, improve the drilling efficiency and reduce the drilling cost, it is necessary to obtain accurate bottom hole weight. [0003] The main disadvantages of the existing constant pressure-on-bit automatic drill feeding system: [0004] 1) At present, the WOB value of the given automatic drill feeding system is obtained based on the driller's experience or tedious trial drilling, and the accuracy is poor. [0005] 2) During the drilling process, especially in the drill...

AI Technical Summary

Problems solved by technology

[0004] 1) At present, the WOB value of the given automatic drill feeding system is obtained based on the driller's experience or tedious test drilling, and the accuracy is poor

[0005] 2) During the drilling process, especially in the drilling process of horizontal wells, the friction of the horizontal well section is large, and it is not easy to apply the drill bit load, resulting in a large difference between the pressure on the surface and the bottom hole, so it is impossible to obtain accurate bottom hole WOB, let alone an accurate bottom-hole WOB

[0006] 3) Due to the inability to apply accurate bottom-hole drilling pressure, the actual bottom-hole drilling pressure deviates from the ideal value

Small WOB will restrict the performance of the drill bit, and even lower rock-breaking efficiency; excessive bottom-hole WOB will lead to increased wear and shortened life of the drill bit

Therefore, too large or too small WOB is very unfavorable to drilling operations.

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