Hair clip type core lifter for improving coring quality in complex formation and its ap-plication

Authors

LIAO Yuansu, No. 2 Geological ServeyTeam of Jiangxi Nonferrous Metals Geological Exploration Bureau, Ganzhou 341000, China
HU Qifeng, No. 2 Geological ServeyTeam of Jiangxi Nonferrous Metals Geological Exploration Bureau, Ganzhou 341000, China
MIAO Sai, No. 2 Geological ServeyTeam of Jiangxi Nonferrous Metals Geological Exploration Bureau, Ganzhou 341000, China
CHEN Haoxi, No. 2 Geological ServeyTeam of Jiangxi Nonferrous Metals Geological Exploration Bureau, Ganzhou 341000, China
ZHUO Lianming, No. 2 Geological ServeyTeam of Jiangxi Nonferrous Metals Geological Exploration Bureau, Ganzhou 341000, China

Abstract

Based on the urgent need of accurate exploration of geological anomalous bodies such as collapse columns and small faults in underground coal mines for near-horizontal boreholes coring drilling of leakage formation, the double-wall hydraulic reverse circulation continuous coring technology was proposed, its technical principle and characteristics were analyzed, the matching ø89/42 mm double-wall coring drilling pipes and reverse circulation coring bits were developed. Three near-horizontal coring boreholes were drilled, the functional tests were carried out in a surface mine, the maximum core recovery rate of a single borehole was 83.6%, the maximum roundtrip footage was 69 m and the average drilling efficiency can be up to 3.61-6.26 m/h. The relevant improvement and optimization schemes of double-wall coring tool were put forward to solve the problem of serious flushing fluid leakage in leakage formation, and subsequent tests have shown that the return water flow and flow rate of the core return channel were greatly improved with adopting optimized coring tools. Finally, the problems of borehole annulus slagging and core blocked in the reverse circulation core construction was pointed out and the corresponding solutions were put forward, including using the method of positive and reverse circulation deslagging to solve the problem of hole annulus deslagging and using the method of hydraulic releasing stuck in the center channel to solve the problem of core stuck. The test shows that the double-wall coring drilling tool can meet the operation requirements of underground geological anomalous bodies exploration and provides a new technical approach for underground geological anomalous bodies exploration.

Keywords

leakage formation, hydraulic reverse circulation coring, near-horizontal borehole, core blockage, solutions

DOI

10.3969/j.issn.1001-1986.2020.06.033

Recommended Citation

LIAO Yuansu, HU Qifeng, MIAO Sai, et al. (2020) "Hair clip type core lifter for improving coring quality in complex formation and its ap-plication," Coal Geology & Exploration: Vol. 48: Iss. 6, Article 34.
DOI: 10.3969/j.issn.1001-1986.2020.06.033
Available at: https://cge.researchcommons.org/journal/vol48/iss6/34

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