High-stability short-radius deflecting drilling tool

Abstract

The invention discloses a high-stability short-radius deflecting drilling tool which comprises a drill bit, a guide short section and a self-resetting flexible drilling rod, a driving connector is arranged at the tail end of the self-resetting flexible drilling rod, and the self-resetting flexible drilling rod is driven by a rotary driving power device through the driving connector so as to obtain rotary drilling power of short-radius rotary directional drilling. The front end of the self-resetting flexible drill rod is fixedly connected with the rear end of the guiding short section, the self-resetting flexible drill rod can transmit bit pressure and torque to the guiding short section in a steerable mode, and a drill bit is fixedly arranged at the front end of the guiding short section. According to the device, rigid transmission of bit pressure torque can be achieved, meanwhile, high-flexibility bending can be easily achieved, and a guiding tool can achieve guiding with extremely low guiding force; the engineering feasibility and practical value of the short-radius directional drilling technology on thin layer development, remaining oil potential tapping, multi-layer oil and gas commingling production, coal bed gas development and other kinds of mineral development are improved.

Description

technical field [0001] The invention relates to the field of drilling and drilling, in particular to a high-stability short-radius deflection drilling tool. Background technique [0002] The short-radius directional drilling technology has engineering feasibility and practical value for the development of multi-layer oil and gas fields, the development of thin layers, the exploitation of remaining oil potential, the development of coalbed methane and the development of other types of minerals. [0003] Some scholars believe that directional wells with a curvature radius of 30°-90° / 30m should be defined as medium and short-radius directional wells, and directional wells with a curvature radius of 90°-300° / 30m should be defined as short-radius directional wells. Directional wells with a radius greater than 300° / 30m are defined as ultra-short radius directional wells. [0004] At present, during the drilling process, it often happens that the curvature of the wellbore is too s...

AI Technical Summary

Problems solved by technology

[0004] At present, in the process of drilling, it often happens that the curvature of the wellbore is too small, resulting in too long build-up section, and a large amount of invalid footage will be generated in the well section in the turning state, which leads to poor economic benefits and increases the difficulty of operating the well construction section.

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