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

A technology of oil and gas, viscous resistance, applied in drilling equipment and methods, drilling equipment, drilling automatic control system, etc., can solve the problems of decreased drilling efficiency and drilling pressure, and achieve the effect of improving efficiency and reducing impact

Active Publication Date: 2015-03-18
BC P INC CHINA NAT PETROLEUM CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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 ...

Method used

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

Examples

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Effect test

Embodiment 1

[0033] Embodiment 1: as figure 1 , figure 2 , image 3 As shown, a method of controlling oil and gas drilling to reduce the viscous resistance of the drill string,

[0034] The method and system proposed by the present invention are also applicable to other types of drilling rigs, such as drilling rigs and ocean drilling rigs, which rely on the rotary table and kelly to provide rotational power.

[0035] The top drive body is suspended on the derrick through the hook connected with the travel car, and can move up and down along the vertical guide rail parallel to it. In the rotary drilling mode, the top drive main motor drives the top drive main shaft to rotate, and then drives the drill string connected to it to rotate, and the middle drill string in the wellbore also rotates accordingly. In the sliding drilling mode, the middle drill string has been rotated into place (that is, not rotating) driven by the top drive, while the drill bit is rotated by the downhole power mo...

Embodiment 2

[0090] Embodiment 2: as figure 1 , figure 2 , image 3 As shown, a method of controlling oil and gas drilling to reduce the viscous resistance of the drill string. Aiming at the problems of large friction between the drill string and the well wall, unstable pressure on bit, and low ROP in the traditional directional drilling technology, the drilling tool was studied. Combining the upper torque generated by the connected top drive, rotary table and other power devices, the reaction torque generated by the downhole power drilling tool and the friction resistance torque between the drill string and the well wall, so that the friction torque balances the upper rotation torque and bottom hole reaction torque to achieve The ideal balance state (the vector sum of the three is zero), thereby reducing the viscosity of the drill string, stabilizing the WOB, and increasing the ROP.

[0091]The basic principle of the present invention is to make the surface system (top drive or turntab...

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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...

Claims

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Application Information

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IPC IPC(8): E21B44/00E21B3/00
CPCE21B3/02E21B44/00
Inventor 邹连阳徐文刘新立赵静马瑞邹来方汪海阁任荣权唐纯净葛云华纪国栋
Owner BC P INC CHINA NAT PETROLEUM CORP
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