温敏清洗剂原位乳化清洗油基钻井液室内研究

doi:10.11885/j.issn.16745086.2021.04.29.14

西南石油大学学报(自然科学版) ›› 2021, Vol. 43 ›› Issue (4): 90-98.DOI: 10.11885/j.issn.16745086.2021.04.29.14

• 深层和非常规油气钻完井专刊 • 上一篇下一篇

温敏清洗剂原位乳化清洗油基钻井液室内研究

任妍君¹, 李淼¹, 蒋其辉², 石静康¹, 易多¹

1. 西南石油大学石油与天然气工程学院, 四川成都 610500;
2. 中国石油集团工程技术研究院有限公司, 北京昌平 102206

收稿日期:2021-04-29 发布日期:2021-08-06
通讯作者: 任妍君,E-mail:yanjun_Ada@163.com
作者简介:任妍君,1984年生,女,汉族,河南焦作人,讲师,博士,主要从事油气井工作液方向的教学与研究工作。E-mail:yanjun_Ada@163.com
李淼,1999年生,男,汉族,四川巴中人,主要从事石油工程方面的研究。E-mail:2230936277@qq.com
蒋其辉,1986年生,男,汉族,河南驻马店人,工程师,博士,主要从事油气藏增产改造工作液及关键技术研究。E-mail:jiangqihuidri@cnpc.com.cn
石静康,1999年生,男,汉族,河南焦作人,主要从事石油工程方面的研究工作。E-mail:1332494803@qq.com
易多,1998年生,男,汉族,四川广安人,主要从事石油工程方面的研究。E-mail:1485654132@qq.com
基金资助:
非常规油气层保护四川省青年科技创新研究团队项目（2021JDTD0017）；中国石油集团工程技术研究院有限公司院级课题（CPET202019）；大学生创新训练计划项目（201910615005）

Cleanup of Oil-based Drilling Fluids Using In-situ Emulsification of Thermoresponsive Surfactants

REN Yanjun¹, LI Miao¹, JIANG Qihui², SHI Jingkang¹, YI Duo¹

1. Petroleum Engineering School, Southwest Petroleum University, Chengdu, Sichuan 610500, China;
2. CNPC Engineering Technology R & D Company Limited, Changping, Beijing 102206, China

Received:2021-04-29 Published:2021-08-06

摘要/Abstract

摘要： 对井筒中残留油基钻井液的高效清除，是实现优质固井、保证井筒完整性的关键。为适应耐温耐盐清洗要求，采用温控乳液转相效应与浊点效应相协同原理，将清洗液直接接触井内油污，原位生成微/纳米乳液以高效清除油污。通过模拟井下温变规律以及浊点、电导率测试，确定了清洗剂配方及其温敏特性，即脂肪醇聚氧乙烯醚与异构羰基聚氧乙烯醚以3： 2复配，在75℃附近从水溶液中开始析出并富集在油污表面，促进油污脱落；油污与清洗液充分混溶，混合液在降温过程中通过形成微/纳米乳液从而促进油污增溶。通过清洗率、润湿角、胶结强度测试，评价了清洗液浓度、温度、盐度及时间对清洗效果的影响，结果表明，50～90℃及含20%钙盐条件下，10 min内5%清洗剂能够高效地清除壁面附着的油基钻井液，清洗效率高达99%以上；除污后壁面可由油润湿状态恢复为水润湿状态，固井胶结强度显著提高。

关键词: 温敏清洗剂, 原位乳化, 油基钻井液, 洗井, 固井

Abstract: Efficient removal of residual oil-based mud in wellbore is the key for excellent cementing and wellbore intergrity. To clean the oil-based mud at high temperature and high salt efficiently, the cleaning agent was used to form micro- and nanoemulsion in-situ with the oil-based drilling fluid based on the thermoresponsive phase inversion effect and cloud point effect. By simulating the law of temperature change in the well and testing the cloud point and conductivity, the cleaning agent formula was identified as the mixture of 3% fatty alcohol-polyoxyethylene ether and 2% isomeric carbonyl polyoxyethylene ether. The cleaning agent was thermoresponsive. It could seperate out from its aqueous solution at 75℃ and therefore facilitate the oil phase shedding; then the oil phase mixed with the cleaning fluid and was then solubilized in the cleaning fluid by forming the micro-and nano-emulsion. The effects of cleaning agent concentration, temperature, salinity and time on the cleaning results were investigated by testing the cleaning rate, contact angle and cementing strength. The results showed that the cleaning rate of over 99% of oil-based mud could be reached using 5% thermoresponsive cleaning agent at 50～90℃ and 20% CaCl₂ with 10 minutes, the wall surface could return to water wetting state from the oil wetting state, and the cementing strength was enhanced observably.

Key words: thermoresponsive cleaning agent, in-situ emulsifacation, oil-based mud, well washing, well cementation

中图分类号:

TE252

任妍君, 李淼, 蒋其辉, 石静康, 易多. 温敏清洗剂原位乳化清洗油基钻井液室内研究[J]. 西南石油大学学报(自然科学版), 2021, 43(4): 90-98.

REN Yanjun, LI Miao, JIANG Qihui, SHI Jingkang, YI Duo. Cleanup of Oil-based Drilling Fluids Using In-situ Emulsification of Thermoresponsive Surfactants[J]. Journal of Southwest Petroleum University(Science & Technology Edition), 2021, 43(4): 90-98.

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温敏清洗剂原位乳化清洗油基钻井液室内研究

Cleanup of Oil-based Drilling Fluids Using In-situ Emulsification of Thermoresponsive Surfactants

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