Key Drilling Technologies for Complex Ultra-Deep Wells  in the Tarim Keshen 9 Gas Field

WANG Xuelong; HE Xuanpeng; LIU Xianfeng; CHENG Tianhui; LI Ruiliang; FU Qiang

doi:10.11911/syztjs.2020028

Volume 48 Issue 1

Feb. 2020

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Petroleum Drilling Techniques > 2020 > 48(1): 15-20. > DOI: 10.11911/syztjs.2020028

WANG Xuelong, HE Xuanpeng, LIU Xianfeng, CHENG Tianhui, LI Ruiliang, FU Qiang. Key Drilling Technologies for Complex Ultra-Deep Wells in the Tarim Keshen 9 Gas Field[J]. Petroleum Drilling Techniques, 2020, 48(1): 15-20. DOI: 10.11911/syztjs.2020028

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Key Drilling Technologies for Complex Ultra-Deep Wells in the Tarim Keshen 9 Gas Field

Tarim Drilling Company, CNPC Bohai Drilling Engineering Company Limited, Korla, Xinjiang, 841000, China

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Received Date: October 21, 2019
Revised Date: December 17, 2019
Available Online: December 27, 2019

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Abstract

Abstract

The Tarim Keshen 9 Gas Field shows the typical characteristics of ultra-deep, high temperature and high pressure environments. During the drilling process, challenges such as complex geological structures, long drilling period, the coexistence of high-pressure saline and weak leakage layers in the salt-gypsum layer, difficulty in the anti-slanting and rapid drilling of high steep post-salt strata, and low ROP in the Jedick formation and tight sandstone reservoir. To overcome the problems, vertical drilling tools and optimized high-efficiency PDC bit were piloted in the post-salt strata; high-density oil-based drilling fluid, pressure management water drainage and safe drilling technologies were used in the salt-gypsum layer; 360° rotating teeth bit, turbine + impregnated bit speed-up drilling technologies were used in tight sandstone reservoirs. The combination of the above technologies constituted the key drilling technologies for complex ultra-deep wells in the Tarim Keshen 9 Gas Field. Those key technologies achieved significant field application effects. The average drilling period in the Keshen 9 Gas Field was reduced by 12.0%, the accident complex time efficiency was reduced by 4.1%, and the average ROP was increased by 13.0%. The results showed that the key technology of complex ultra-deep well drilling had high application value to increase the drilling speed and reduce the complexity in Keshen 9 Gas Field
- ultra-deep well,
- evaporite bed,
- vertical drilling,
- penetration rate,
- oil-based drilling fluid,
- Keshen 9 Gas Field,
- Tarim Oilfield

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