Key Technologies for Drilling and Completing Ultra-deep Wells in the Bozi 1 Block of Kelasu Structure

YIN Zhaohai; LI Guoqiang; WANG Hai; DING Yongliang; WANG Yun; LIU Changzhu

doi:10.11911/syztjs.2020130

Volume 49 Issue 1

Jan. 2021

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Petroleum Drilling Techniques > 2021 > 49(1): 16-21. > DOI: 10.11911/syztjs.2020130

YIN Zhaohai, LI Guoqiang, WANG Hai, DING Yongliang, WANG Yun, LIU Changzhu. Key Technologies for Drilling and Completing Ultra-deep Wells in the Bozi 1 Block of Kelasu Structure[J]. Petroleum Drilling Techniques, 2021, 49(1): 16-21. DOI: 10.11911/syztjs.2020130

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Key Technologies for Drilling and Completing Ultra-deep Wells in the Bozi 1 Block of Kelasu Structure

1.
Directional Well Technology Services Company, CNPC Bohai Drilling Engineering Company Limited, Tianjin, 300450, China
2.
International Engineering Company, CNPC Bohai Drilling Engineering Company Limited, Tianjin, 300450, China

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Received Date: April 20, 2020
Revised Date: November 14, 2020
Available Online: December 03, 2020

Graphical Abstract

Abstract

Abstract

Technical difficulties such as low ROP, long drilling cycle, poor cementing quality, and high drilling safety risk occur when drilling the upper part of complex ultra-deep wells in the Bozi 1 Block of the Kelasu structure. To break down these problems, a casing program was optimized in terms of regional geological characteristics and theoretical analysis; a series of technologies in ROP enhencment were optimized; combined evaporite bed determine technology was proposed, and a series of antileaking and lost circulation control technical measures and cementing measures were formulated. Consequently, key technologies for drilling and completion of complex ultra-deep wells in Bozi 1 Block of Kelasu structure were formed. The technologies had been tested in four wells including B1103 with an excellent potential for universal applicability. Compared with the neighboring wells using other drilling and completion technologies, there were many positive advances. For example, the ROP was increased by 34.4%, drilling cycle was reduced by 131 days, and completion cycle was cut by 141 days. This showed that the technologies could solve the technical difficulties in drilling and completion of ultra-deep wells reservoirs in the Bozi 1 Block, ensuring safe and efficient drilling and completion. Hence, the key technologies could be widely adopted in this block.
- ultra-deep drilling,
- ROPenhencment,
- antileaking,
- lost circulation control,
- evaporate bed,
- bed determine,
- Bozi 1 Block

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