Core drilling technology for ultra thick sedimentary layers of ZC1 well in Sanlingwan, Zhangye, Gansu

TIAN Zhichao; YU Sen; ZHAI Yufeng; YANG Huaijun; LIU Zhenxin; YANG Fang; GUO Yaoxin

doi:10.12143/j.ztgc.2025.01.008

2025 Vol. 52, No. 1

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Article navigation > DRILLING ENGINEERING > 2025 > 52(1): 54-61

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TIAN Zhichao, YU Sen, ZHAI Yufeng, YANG Huaijun, LIU Zhenxin, YANG Fang, GUO Yaoxin. 2025. Core drilling technology for ultra thick sedimentary layers of ZC1 well in Sanlingwan, Zhangye, Gansu. DRILLING ENGINEERING, 52(1): 54-61. doi: 10.12143/j.ztgc.2025.01.008

Citation:

TIAN Zhichao, YU Sen, ZHAI Yufeng, YANG Huaijun, LIU Zhenxin, YANG Fang, GUO Yaoxin. 2025. Core drilling technology for ultra thick sedimentary layers of ZC1 well in Sanlingwan, Zhangye, Gansu. DRILLING ENGINEERING, 52(1): 54-61. doi: 10.12143/j.ztgc.2025.01.008

Core drilling technology for ultra thick sedimentary layers of ZC1 well in Sanlingwan, Zhangye, Gansu

1. College of Marine Geosciences, Ocean University of China, Qingdao Shandong 266100, China;
2. Shandong No .3 Exploration Institute of Geology and Mineral Resources, Yantai Shandong 264004, China;
3. Drilling Engineering Technology Research Center of Shandong Provincial Bureau of Geology & Mineral Resources, Yantai Shandong 264004, China

More Information

Corresponding author: GUO Yaoxin

Received Date: 09 September 2024

Revised Date: 18 November 2024

Abstract

Abstract

The sedimentary strata has poor stability, and accidents such as shrinkage, collapse, block falling, and adsorption sticking are prone to occur. Conducting core drilling in sedimentary strata has always been a technical challenge in the drilling field. This article introduces the construction technology of core drilling in ultra thick sedimentary layers for the Zhangye geothermal core drilling project (ZC1 well) in Gansu Province. The various drilling techniques has been innovatively applied in this project, the research and application of flushing fluid systems, deep hole coring equipment, etc., are conducted, which solved the problems of borehole instability, adsorption sticking,drilling tool failure, and low drilling efficiency due to ultra thick sedimentary layers. It has formed a continuous core drilling process system for ultra thick sedimentary layers, providing reference for the subsequent drilling constructions in the similar complex formations.
- ultra thick sedimentary layer /
- deep drilling /
- complex formation /
- deep hole coring equipment /
- cross caliber wireline core drilling

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References

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