石油科技论坛

石油科技论坛 ›› 2017, Vol. 36 ›› Issue (增刊): 45-47.DOI: 10. 3969/ j. issn. 1002-302x. 2017. z1. 013

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CQ-HDEM 无土相油基钻井液技术

凡　帆1，2，王京光1，2，赵海峰1，2   

  1. 1. 中国石油集团川庆钻探工程有限公司工程技术研究院; 2. 低渗透油气田勘探开发国家工程实验室
  • 出版日期:2018-03-25 发布日期:2018-04-13
  • 基金资助:
    中国石油天然气集团公司科学研究与技术开发项目“重点提速地区提速技术研究与应用” (编号: 2013T-0105- 001)。

CQ-HDEM Clay-free Oil-based Drilling Fluid Technology

Fan Fan1,2,Wang Jingguang1,2, Zhao Haifeng1,2   

  1. 1. CCDC Drilling & Production Technology Research Institute, Xi’an 710018, China; 2. National Engineering Laboratory for Exploration and Development of Low-permeability Oil & Gas Fields, Xi’an 710018, China
  • Online:2018-03-25 Published:2018-04-13

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摘要： 针对传统的有土相油基钻井液在高密度条件下暴露出的流变性差、易诱发井漏等技术难题, 研制了以油 基钻井液用乳化剂G326 和润湿剂G329 为核心处理剂, 配套形成了CQ-HDEM 无土相油基钻井液体系, 实现了主要处 理剂国产化。室内实验结果表明, 该体系流变性好、电稳定性强, 密度可达2. 50g/ cm3, 抗温160℃, 与有土相油基钻 井液相比, 无土相油基钻井液具有更强的电稳定性和更低的终切力, 有利于预防高密度条件下油基钻井液的稠化和复 杂地层漏失问题。该体系在四川长宁—威远和壳牌反承包项目页岩气水平井中进行了现场试验应用, 均取得良好效果, 能够满足页岩气水平井安全快速钻井施工的要求。

关键词: 油基钻井液; 乳化剂润湿剂; 页岩气; 无土相

Abstract: Conventional clay oil-based drilling fluid has a poor rheological property under high density, thus easily leading to well leakage. CNPC Chuanqing Drilling and Exploration Corporation has developed clay-free oil-based drilling fluid CQ-HDEM, which is based on emulsifier G326 and wetting agent G329. The main processing agents are localized as a result. The indoor experiment results indicated that this drilling fluid system has a good rheological property and a high electric stability. The density reaches 2. 50g/ cm3 while resistance to temperature is up to 160℃. As compared to conventional clay oil-based drilling fluid, the clay-free oil-based drilling fluid has a higher electric stability and a lower final gel strength, favorable for settlement of such problems as thickening of oil-based drilling fluid and lost circulation in complicated formation in case of high density. This drilling fluid system was in shale gas horizontal wells of Changning- Weiyuan and the project contracted by Shell in Sichuan, with good results achieved on the drilling sites. It is able to satisfy the demand for safety in quick drilling of shale gas horizontal wells.

Key words: oil-based drilling fluid, emulsifier and wetting agent, shale gas, clay-free