南海东部M区块古近系地层井壁稳定钻井液技术

Application of Wellbore Stabilization Drilling Fluids Technique on Paleogene Strata in M Block, the Eastern South China Sea

肖夏 陈彬

XIAO Xia CHEN Bin

中海石油（中国）有限公司深圳分公司深水工程技术中心，广东深圳　518067

Deepwater Well Engineering & Operation Center, Shenzhen Branch, CNOOC China Ltd., Shenzhen , Guangdong, 518067, China

在南海东部古近系地层作业期间，常规的钻井液体系对硬脆性裂缝地层及渗透性砂岩地层无法起到有效的封堵作用，也就无法改善地层的承压、防漏失能力，导致在多口井中出现井壁失稳、卡钻、井漏等复杂情况。该文以南海东部M区块为例，探索一种KL强封堵钻井液体系，该体系在现场应用时表现出优良的封堵性能，起到了维持井壁稳定的良好效果。KL强封堵钻井液体系在M区块古近系地层的成功应用可为后续提高井壁稳定性的钻井液选型提供参考。

During the operation of Paleogene strata in the eastern South China Sea, conventional drilling fluid systems cannot effectively plug hard and brittle fractured formations and permeable sandstone formations, unable to improve the pressure-bearing and anti-leakage ability of the formation, which has led to complex problems such as wall instability, stuck drilling, and lost circulation in many wells. This paper takes M block in the eastern South China Sea as an example, establishing a KL strong plugging drilling fluid system which showed excellent plugging performance when applied in the field, and effectively maintained the stability of the borehole wall. The successful application of the KL strong plugging drilling fluid system in Paleogene strata in M block can be used as reference for drilling fluids selection to improve the stability of the borehole.

https://doi.org/10.3969/j.issn.1008-2336.2022.03.081