Optimization of the Casing-Wellbore Gap in Complex Strata of the Ying-Qiong Basin, South China Sea

JU Ran; GUAN Zhichuan; HUANG Yi; LUO Ming; LI Wentuo; DENG Wenbiao

doi:10.11911/syztjs.2019003

Volume 47 Issue 1

Jan. 2019

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Petroleum Drilling Techniques > 2019 > 47(1): 32-36. > DOI: 10.11911/syztjs.2019003

JU Ran, GUAN Zhichuan, HUANG Yi, LUO Ming, LI Wentuo, DENG Wenbiao. Optimization of the Casing-Wellbore Gap in Complex Strata of the Ying-Qiong Basin, South China Sea[J]. Petroleum Drilling Techniques, 2019, 47(1): 32-36. DOI: 10.11911/syztjs.2019003

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Optimization of the Casing-Wellbore Gap in Complex Strata of the Ying-Qiong Basin, South China Sea

1.
School of Petroleum Engineering, China University of Petroleum(Huadong), Qingdao, Shandong, 266580, China
2.
Zhanjiang Branch, CNOOC (China) Co., Ltd., Zhanjiang, Guangdong, 524057, China

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Received Date: September 14, 2018
Revised Date: December 09, 2018
Available Online: January 16, 2019

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Abstract

Abstract

The goal of this study was to eliminate well hazards and drilling problems associated with wide pressure fluctuations encountered in complex strata in the Ying-Qiong Basin of the South China Sea. This basin is characterized by its high temperature and high pressure strata, complex geological structure and narrow drilling mud window. In order to prevent complex downhole events such as circulation lost, overflow and even blowout induced from pressure fluctuations during casing RIH, a calculation model of pressure fluctuation during casing RIH was established on the basis of a full investigation over the common casing program in the Ying-Qiong Basin of the South China Sea, and the optimization over the casing-wellbore gap was conducted by combining annulus pressure analysis during casing RIH and cementing job under different factors. The casing-wellbore gap of the fifth spud section of Well LD10-2-x subject to narrow safe mud window was optimized, and reasonable gap in that section was defined to be 15.00-19.55 mm. The actual casing-wellbore gap in Well LD10-2-x was 17.45 mm within the reasonable gap range, and the casing was run in the borehole with no downhole events such as circulation lost and overflow during the cementing. This indicated that the casing-wellbore gap could be optimized according to surge pressure during casing RIH, as well as annulus pressure during casing RIH and cementing, which would provide a reference in the casing program design in the Ying-Qiong Basin of the South China Sea.
- safety density window,
- casing program,
- surge pressure,
- annuluspressure,
- gap,
- Well LD10-2-x,
- Ying-Qiong Basin,
- South China Sea

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Optimization of the Casing-Wellbore Gap in Complex Strata of the Ying-Qiong Basin, South China Sea

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