A geological exploration drilling tool and its application

By designing coordinated rotation of internal and external drilling tools and cement slurry sealing, the problem of borehole deviation in fault zones was solved, thereby improving the stability and verticality of the borehole.

CN115653485BActive Publication Date: 2026-06-30THE THIRD EXPLORATION TEAM OF SHANDONG COALFIELD GEOLOGY BUREAU
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Patent Information

Application Number
CN202211440445.2
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2022-11-17
Publication Date
2026-06-30
Estimated Expiration
2042-11-17

AI Technical Summary

Technical Problem

During drilling operations, especially when encountering isolated rocks in fault zones, boreholes are prone to deviation, making it difficult to maintain verticality and stability.

Method used

A geological exploration drilling tool was designed, including an internal drilling tool and an external drilling tool. The internal drilling tool is driven to rotate in one direction by a turbine, while the external drilling tool rotates in the opposite direction. Combined with cement grout to seal fault gaps, the risk of deviation is reduced.

Benefits of technology

By coordinating the rotation of the inner and outer drilling tools and sealing with cement slurry, the stability and verticality of the borehole in the fault zone are improved, and the possibility of borehole deviation is reduced.

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Abstract

This invention relates to a geological exploration drilling tool and its application. The inner diameter of the outer drilling tool's inner cavity gradually decreases from top to bottom, forming a first step, a second step, and a third step. The inner drilling tool is cylindrical in shape, with an annular outer boss in the middle section. A turbine stator is pressed and fixed between the first and second steps of the outer drilling tool by a stator cap, and a turbine rotor is pressed and fixed to the upper section of the inner drilling tool by a rotor cap. A flushing fluid buffer chamber is formed between the inner and outer drilling tools at the lower part of the turbine stator and rotor, and above the annular outer boss. A first cooling channel is provided in the middle section of the inner drilling tool, and a second cooling channel is provided in the lower section. The first cooling channel is connected to the flushing fluid buffer chamber through a connecting inclined hole. External drill teeth are provided at the bottom of the outer drilling tool, and internal drill teeth are provided at the bottom of the inner drilling tool. This invention can overcome the borehole deviation problem caused by encountering faults containing boulders during drilling operations, ensuring borehole verticality.
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Citation Information

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