Method and system for pressurization control of rotary drilling rig

Abstract

The invention provides a pressurization control method and a pressurization control system for a rotary drilling rig. The pressurization control method comprises the following steps of: 1, detecting the inclination of a mast of the rotary drilling rig; 2, judging whether the inclination of the mast exceeds a preset value or not, if so, performing a step 3, and otherwise, performing a step 4; 3, reducing pressurization force, and returning to the step 1; and 4, performing drilling construction by using the rotary drilling rig. By the method and the system, the inclination of the mast is related to pressurization control; due to the adoption of closed-loop control, the pressurization force can be adjusted in time according to the real-time inclination of the mast; and the method and the system have the advantages of high safety, high drilling accuracy, high construction efficiency and the like.

Description

technical field [0001] The invention mainly relates to the fields of control and engineering machinery, and in particular to a pressure control method and system for a rotary drilling rig. Background technique [0002] The drilling system of the rotary drilling rig mainly includes two basic actions: downward pressurization construction and upward drilling operation. During pressurized construction, the rotary drilling rig has a maximum allowable pressure. When the pressure is less than the maximum allowable pressure, the construction speed will be reduced, the construction efficiency will be affected, and the construction period will be delayed; and when the pressure exceeds the maximum allowable pressure When under pressure, as the pressure increases, the front of the rotary drilling rig is lifted by the mast, which can easily cause the mast to crack, and at the same time cause the drilling to tilt, seriously affecting equipment safety and construction quality. [0003] In...

AI Technical Summary

Problems solved by technology

During pressurized construction, the rotary drilling rig has a maximum allowable pressure. When the pressure is less than the maximum allowable pressure, the construction speed will be reduced, the construction efficiency will be affected, and the construction period will be delayed; and when the pressure exceeds the maximum allowable pressure When under pressure, as the pressure increases, the front of the rotary drilling rig is lifted by the mast, which can easily cause the mast to crack, and at the same time cause the drilling to tilt, seriously affecting equipment safety and construction quality

[0003] In the prior art, the rotary drilling rig controls the pressure of the drill pipe through the controller. This system is a one-way control from the controller to the hydraulic system, which belongs to an open-loop control system. The operator cannot guarantee that the pressure will remain at the maximum allowable pressure during operation. pressure, thus causing defects of improper pressurization (too high or too low)

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