Short-radius controllable trajectory drilling tool

Abstract

The invention provides a short-radius controllable trajectory drilling tool. The drilling tool comprises a drill bit and a controllable flexible bit pressure torque transmission tubular column, wherein the controllable flexible bit pressure torque transmission tubular column comprises an offset lever and a plurality of bearing short sections, and the lower end of the offset lever is fixedly connected with the drill bit; every two adjacent bearing short sections are hinged through a bit pressure torque deflection transmission mechanism, the lowermost bearing short section is a bearing body, anda deflection guide mechanism is arranged on the bearing body; the lower portion of the offset lever is hinged to the lower portion of the bearing body through a controllable bit pressure torque deflection transmission mechanism, and a movable gap is formed between the offset lever and the bearing body; and the deflection guide mechanism is arranged in the movable gap and located above the controllable bit pressure torque deflection transmission mechanism, and the deflection guide mechanism can drive the offset lever to swing and / or rotate. According to the short-radius controllable trajectorydrilling tool, deflecting of boreholes of short-extremely-short-radius wells can be achieved, or guiding drilling of extending well sections of the short-extremely-short-radius wells can be achievedthrough short-extremely-short-radius well sections.

Description

technical field [0001] The invention relates to the technical field of drilling, in particular to a short-radius controllable trajectory drilling tool. Background technique [0002] The control of production costs has always been the goal pursued by oil and gas drilling. With the development of unconventional oil and gas fields, the requirements for drilling equipment are getting higher and higher. Automatic, intelligent and efficient drilling technology has become the mainstream of reducing costs and improving efficiency. , In addition, drilling technology also has a large number of applications in the field of geological engineering and mineral development. [0003] At present, the bottom drilling tool assembly of rotary drilling equipment generally controls the deflection performance of the drilling tool through the placement position of different stabilizers or other changes in the relationship between the drilling tool assembly, which can realize the limit deflection ra...

AI Technical Summary

Problems solved by technology

Because the existing directional drilling technology cannot achieve short-radius steering, it is difficult to develop ultra-thin reservoirs, or it is difficult to create a directional well in the cap rock but requires a large curvature steering after entering the reservoir, or realize branching as much as possible Drilling, or realizing large-angle turns in shallow formations, or sidetracking branch wells in existing wells to realize the production of side well reserves; in the prior art, screw drilling tools with bent joints are usually used to drill branch wells To realize the production of side-hole reserves, the existing data show that the existing screw drilling directional drilling technology and other directional drilling technologies cannot exceed the build-up rate of 15° / 30m

[0006] To sum up, if the wellbore curvature is too large, the existing directional well technology with controllable trajectory cannot be realized; if the wellbore curvature is too small, the build-up section is too long, and the well section in the turning state will generate a large amount of invalid footage. The economic benefit is poor and the operation difficulty of the construction well section is increased. The steering performance and passing performance of other controllable trajectory drilling tools cannot exceed the limit of 18° / 30m, which has the same problems as the screw drilling tools detailed above.

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