Blind drilling technology in wire-line core drilling

WANG Famin; WEI Heping; ZI Bing; ZHANG Ning and WANG Wei; ${author.authorNameEn}

doi:10.12143/j.ztgc.2021.09.010

2021 Vol. 48, No. 9

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WANG Famin, WEI Heping, ZI Bing, ZHANG Ning and WANG Wei, . 2021. Blind drilling technology in wire-line core drilling. DRILLING ENGINEERING, 48(9): 88-92. doi: 10.12143/j.ztgc.2021.09.010

Citation:

WANG Famin, WEI Heping, ZI Bing, ZHANG Ning and WANG Wei, . 2021. Blind drilling technology in wire-line core drilling. DRILLING ENGINEERING, 48(9): 88-92. doi: 10.12143/j.ztgc.2021.09.010

Blind drilling technology in wire-line core drilling

1. Geology and Mineral Exploration Academy of Ningxia， Yinchuan Ningxia 750021， China;
2. Ningxia Nuclear Industry Geological Exploration Institute, Yinchuan Ningxia 750021， China

Received Date: 10 December 2020

Revised Date: 06 May 2021

Abstract

Abstract

In 2020， 50 boreholes were drilled for limestone exploration in the Yandong Mountain area of Zhongning county by Geology and Mineral Exploration Academy of Ningxia. With presence of well developed fractures in limestone strata in this mining area， serious circulation loss problems were common， and total circulation loss was encountered in most of the boreholes， which resulted in two bit burning accidents in the early stage of drilling and increased drilling cost. In order to complete drilling tasks and save drilling cost， a blind drilling process was explored through addressing the borehole structure， bit selection， drilling parameters and pump rate optimization， where fresh water was used for drilling fluid with strict control of various drilling parameters. As a result， all drilling tasks were successfully completed with average rig-month efficiency of 883m， and average core recovery of 98%. The process has effectively improved drilling efficiency， and reduced drilling cost， providing strong resource support for local development.
- lost-circulation formation /
- lost return leakage /
- blind drilling /
- wire-line core drilling

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References

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