南海莺歌海盆地中深层高温高压水平井钻井关键技术

Key Drilling Techniques of HTHP Horizontal Wells in Mid-Deep Strata of the Yinggehai Basin, South China Sea

吴江 李炎军 张万栋 杨玉豪

WU Jiang LI Yanjun ZHANG Wandong YANG Yuhao

中海石油（中国）有限公司湛江分公司，广东湛江 524057

CNOOC China Limited, Shenzhen Branch, Zhanjiang, Guangdong, 524057, China

针对南海莺歌海盆地中深层高温高压气藏水平井钻井中高密度钻井液流变性难以调控、大斜度井段套管磨损严重、摩阻扭矩大、钻具负荷大及大斜度井固井质量难以保证等问题，从保障钻井安全和提高钻井时效出发，进行了井身结构设计和抗高温高密度油基钻井液技术、钻井液微米级重晶石加重技术、高密度油基钻井液滤饼冲洗技术、高温高压含CO2气井套管材质优选、高温高压水平井段安全钻进等方面的技术研究，形成了南海莺歌海盆地中深层高温高压水平井钻井关键技术。现场应用表明，该技术可以有效保障安全高效钻井和提高固井质量，应用井投产后清喷产能比预期高30%。水平井钻井关键技术为南海莺歌海盆地中深层高温高压水平井钻井提供了技术保障，也可在同类条件同类型井钻井中推广应用。

During the drilling process of horizontal wells in high temperature and high pressure gas reservoir in Yinggehai Basin, South China Sea, the rheological property of high density drilling fluids is difficult to control, the wearing degree of the highly-deviated well section casing is severe, the toque drag and drilling string are large, and the cementing quality of highly-deviated well section is hard to assure, etc. Based on this situation, to ensure the drilling safety and improve drilling efficiency, research work have been done on casing program design, oil-based drilling fluids technology resisting high temperature and density, the weighting technique of micrometre-scale barite, filter cake flushing technique of high density oil-based drilling fluids, the optimization of casing materials for high temperature and high pressure gas well containing CO2, and the safe drilling technology of HTHP horizontal wells, etc., all of which have formed the key drilling techniques of HTHP horizontal wells in mid-deep strata of the Yinggehai Basin, South China Sea. The field application showed that the techniques could effectively ensure the safety and high-efficiency drilling, improve the cementing quality, and the blowout production capacity is 30% higher than expected. The key drilling techniques of horizontal well, which could provide technical support for the drilling of HTHP horizontal wells in mid-deep strata of the Yinggehai Basin, South China Sea, could also be applied in the wells of the same type under the same condition.

国家科技重大专项“莺-琼盆地高温高压天然气富集规律与勘探开发关键技术”（编号：2016ZX05024-005）、中国海洋石油集团公司科技重大专项“莺琼盆地高温高压钻完井液、固井工艺研究与应用”（编号：CNOOC-KJ 135 ZDXM 24 LTD ZJ02）联合资助

https://doi.org/10.11911/syztjs.2019112