抗高温高密度可逆油基钻井液体系

doi:10.7623/syxb202305009

石油学报 ›› 2023, Vol. 44 ›› Issue (5): 841-851,861.DOI: 10.7623/syxb202305009

抗高温高密度可逆油基钻井液体系

任妍君^1,2, 翟玉芬¹, 路岩岩¹

1. 西南石油大学石油与天然气工程学院四川成都 610500;
2. 油气钻完井技术国家工程研究中心四川成都 610500

收稿日期:2022-02-04 修回日期:2023-03-11 出版日期:2023-05-25 发布日期:2023-05-31
通讯作者: 任妍君,女,1984年10月生,2016年获中国石油大学(北京)博士学位,现为西南石油大学副研究员,主要从事油气井工作液、储层保护研究。
作者简介:任妍君,女,1984年10月生,2016年获中国石油大学(北京)博士学位,现为西南石油大学副研究员,主要从事油气井工作液、储层保护研究。Email:yanjun_Ada@163.com
基金资助:
国家自然科学基金项目"高温深井油基钻井液可逆特性与CO₂/N₂诱导机理研究"（No.51804263）资助。

Reversible oil-based drilling fluid with high-temperature resistance and high density

Ren Yanjun^1,2, Zhai Yufen¹, Lu Yanyan¹

1. Petroleum Engineering School, Southwest Petroleum University, Sichuan Chengdu 610500, China;
2. National Engineering Research Center of Oil & Gas Drilling and Completion Technology, Sichuan Chengdu 610500, China

Received:2022-02-04 Revised:2023-03-11 Online:2023-05-25 Published:2023-05-31

摘要/Abstract

摘要： 为满足高温深井钻井需求以及弥补油基钻井液在完井固井和环境保护方面的不足，基于非离子表面活性剂CN-2构建了CO₂和HAc双响应性可逆油基钻井液体系，并比较了两种纳米颗粒（OTS-KH550/SiO₂、CTAB/SiO₂）对体系性能的影响。结果表明：所建体系在CO₂或HAc诱导下从油包水转相为水包油，该转相可由CaO或NaOH诱导回转。CN-2与OTS-KH550/SiO₂协同稳定的乳状液性能更佳，抗温达250℃。纳米颗粒OTS-KH550/SiO₂的加入不会影响钻井液体系的可逆性能，且能显著地改善体系抗高温性能，使得体系在低油水比50：50~60：40、高密度1.8~2.1 g/cm³及高温180~200℃条件下均具有良好的流变性能和滤失性能。含油钻屑、油基滤饼均可通过CO₂鼓泡或HAc溶液浸泡很容易地被清洗。通过红外光谱分析和微观观察揭示机理为：在CO₂或HAc诱导下，乳化剂发生盐化，亲水性增强，促使乳状液从油包水转相为水包油，从而所制油基钻井液易于被水清洗。纳米颗粒OTS-KH550/SiO₂吸附在油水界面上并形成一层致密的颗粒膜，阻隔液滴聚并，强化了乳状液体系的抗高温稳定性。

关键词: CO₂响应性, 纳米颗粒, 高温高密度, 可逆油基钻井液, 清洗

Abstract: To meet the requirements of deep well drilling at high temperature and make up for the deficiencies of oil-based drilling fluid in well completion and cementation and environmental protection, CO₂ and HAc dual-responsive reversible oil-based drilling fluid was built based on the use of nonionic surfactant CN-2, and the effects of two nanoparticles (OTS-KH550/SiO₂ and CTAB/SiO₂) on the performance of the drilling fluid were compared. The results show that the drilling fluid can invert from water-in-oil to oil-in-water under CO₂ or HAc induction, and the phase inversion can be reversed under CaO or NaOH induction. The emulsion co-stabilized by CN-2 and the nanoparticle OTS-KH550/SiO₂ has better performance, with a temperature resistance of up to 250℃. The addition of nanoparticle OTS-KH550/SiO₂ will not affect the reversibility of the drilling fluid, and can remarkably improve the high temperature resistance of the fluid, and enable the fluid to achieve good rheological and filtration properties at the low oil-water ratio of 50:50-60:40, high density of 1.8-2.1 g/cm³ and high temperature of 180-200℃. The oily cuttings and oil-based filter cakes can be readily cleaned up by CO₂ bubbling or soaking in HAc solution. The mechanism revealed by infrared spectrum analysis and microscopic observation is as following:the emulsifier transforms into its salt under CO₂ or HAc induction, and its hydrophilicity is enhanced, thus inducing the phase inversion of the emulsion from water-in-oil to oil-in-water. As a result, the oil-based drilling fluid can be readily cleaned up by water. In addition, the nanoparticle OTS-KH550/SiO₂ formed a compact particle film on the oil-water interface to prevent droplets from coalescing, thus enhancing the emulsion stability at high temperature.

Key words: CO₂ response, nanoparticle, high temperature and high density, reversible oil-based drilling fluid, cleanup

中图分类号:

TE254

任妍君, 翟玉芬, 路岩岩. 抗高温高密度可逆油基钻井液体系[J]. 石油学报, 2023, 44(5): 841-851,861.

Ren Yanjun, Zhai Yufen, Lu Yanyan. Reversible oil-based drilling fluid with high-temperature resistance and high density[J]. Acta Petrolei Sinica, 2023, 44(5): 841-851,861.

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抗高温高密度可逆油基钻井液体系

Reversible oil-based drilling fluid with high-temperature resistance and high density

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