Method for controlling oil and gas well drilling to reduce drill string viscous resistance

Abstract

The invention discloses a method for controlling oil and gas well drilling to reduce drill string viscous resistance, and belongs to the field of the oil and gas well drilling technology. A top drive device (or rotating disc) is adopted to drive a drill string to rotate forwardly and reversely according to the set rotating manner; through mud-pulse signals, a tool face angle of a power motor, an azimuth angle and well deviation which are monitored by a directional sensor in an MWD and vertical pipe pump pressure are fed to a ground controller through the digital quantity signal mode and are matched with upper portion drill string torque monitored by the top drive (or rotating disc), and through the method that a top drive main shaft (or rotating disc square drill rod) is controlled to forwardly rotate or reversely rotate, the drill string is rotated forwardly or reversely, so that the tool angle face of the well drilling motor is changed, the azimuth angle and the well deviation are adjusted or corrected, and the drill string viscous resistance is reduced; the top drive main shaft is controlled to forwardly rotate by the set angle and the set number of turns, and after being in place, the top drive main shaft rotates reversely to the initial position, and forward cycling is formed. According to the method, influence of manual factors on well drilling work is reduced, and the drilling efficiency and the production safety are improved.

Description

technical field [0001] The invention relates to a method for controlling oil and gas drilling to reduce the viscous resistance of a drill string, belonging to the technical field of oil and gas drilling. Background technique [0002] At present, more and more oil and gas drilling methods are used to drill directional wells, horizontal wells, and extended-reach horizontal wells to increase the penetration length of the wellbore in the oil layer, thereby increasing the oil recovery rate. [0003] The directional well and horizontal well drilling methods based on the prior art are: use a downhole power drilling tool (usually a screw drilling tool) with a certain bending angle to carry out directional drilling. In the deflection (increase, declination or torsion azimuth) well section, the drill string only applies drilling pressure without rotation, and the downhole power drilling tool drills along the direction of the bending angle of the curved shell, and the drill string foll...

AI Technical Summary

Problems solved by technology

[0005] Prior to this, the solution to this problem was to periodically lift and lower the drill string mechanically, or to change the drilling fluid to improve the lubrication of the drill string and the borehole wall, but none of them could solve the problem well, resulting in the application of The weight-on-bit (WOB) on the bit drops, which in turn leads to a drop in drilling efficiency (ROP)

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