Push-lean type rotational guide device

Abstract

The invention provides a push-lean type rotational guide device which comprises a drill collar body, wing ribs, an outer cylinder and a hydraulic control system, wherein the wing ribs are mounted on the outer circumference of the drill collar body; the drill collar body is sleeved by the outer cylinder; the outer cylinder is kept static relative to the drill collar body; the hydraulic control system comprises an oil storage cavity and an execution mechanism; the execution mechanism comprises an oil cylinder communicated with the oil storage cavity and a piston acting on the wing ribs; the hydraulic control system is capable of conveying hydraulic oil between the oil storage cavity and an oil cylinder, and then the wing ribs can make radial telescopic movement under the action of the piston.

Description

technical field [0001] The invention relates to the technical field of oil and gas drilling, in particular to a push-to-type rotary steering device. Background technique [0002] In oil and gas drilling engineering, rotary steerable systems are usually used to guide drilling tools. At present, the rotary steerable drilling technology is the cutting-edge drilling technology in the world, and it has been widely used in the drilling field. The rotary steerable tool can automatically, continuously and real-time adjust the well deviation and azimuth according to the set well trajectory while the drill string is rotating. At the same time, the rotary steerable system has the advantages of low friction, smooth borehole, fast drilling speed, less drilling accidents and low drilling cost, so it can meet the needs of extended reach wells, horizontal wells, highly deviated wells, branch wells and Steering drilling requirements for 3D multi-target wells and other highly difficult spec...

AI Technical Summary

Problems solved by technology

[0005] However, there are still many disadvantages in the dynamic and static pushing and pointing rotary steerable systems in the prior art.

For example, although the dynamic push-back rotary steerable system is not easy to stick the drill, the degree of expansion and contraction of the ribs is uncontrollable, and the magnitude of the guiding force is uncontrollable. At the same time, because the ribs rotate with the outer cylinder, the reliability is poor and the control system is complicated.

Although the control system of the static push-on rotary steerable system is mature, multiple sets of independent hydraulic systems lead to high cost and high power consumption, and under the limitation of the size of the drill collar, the structure of the hydraulic system is complicated, and the hydraulic oil stored in the cylinder and Limited lubricating oil, high requirements for lubrication and dynamic sealing

Although the wellbore drilled by the pointing rotary steerable system is smooth, it is prone to fatigue damage due to the action of high-intensity alternating stress when the mandrel rotates

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