水基钻井液低温流变性调控用温敏聚合物研制及性能评价

doi:10.7623/syxb201805011

石油学报 ›› 2018, Vol. 39 ›› Issue (5): 597-603.DOI: 10.7623/syxb201805011

水基钻井液低温流变性调控用温敏聚合物研制及性能评价

徐加放, 丁廷稷, 张瑞, 张振越, 顾甜甜, 程远方, 王志远

海洋水下设备试验与检测技术国家工程实验室中国石油大学石油工程学院山东青岛 266580

收稿日期:2017-10-10 修回日期:2018-04-01 出版日期:2018-05-25 发布日期:2018-06-06
通讯作者: 王志远,男,1981年12月生,2004年获石油大学(华东)学士学位,2009年获中国石油大学(华东)博士学位,现为中国石油大学(华东)教授,主要从事油气井工程、海洋石油工程、多相流理论及应用等方面的研究。Email:wangzy1209@126.com
作者简介:徐加放,男,1973年10月生,1998年获得石油大学(华东)学士学位,2009年获得中国石油大学(华东)博士学位,现为中国石油大学(华东)教授,主要从事水合物开发与防治、钻井液研发及废弃物处理、井壁稳定、储层保护、分子模拟等研究工作。Email:xjiafang@upc.edu.cn
基金资助:
山东省自然科学基金项目（ZR2017MEE027）、国家基金重点项目（U1762212）、国家科技重大专项（2016ZX05044-003-001）、国家重点基础研究发展计划（973）项目（2015CB251206）、国家重点研发计划（2016YFC0304005，2016YFC0303408）和教育部创新团队项目（IRT_14R58）资助。

Development and performance evaluation of thermo-sensitive polymer for low-temperature rheology control of water-based drilling fluid

Xu Jiafang, Ding Tingji, Zhang Rui, Zhang Zhenyue, Gu Tiantian, Cheng Yuanfang, Wang Zhiyuan

National Engineering Laboratory for Subsea Equipment Testing and Detection Technology;School of Petroleum Engineering, China University of Petroleum, Shandong Qingdao 266580, China

Received:2017-10-10 Revised:2018-04-01 Online:2018-05-25 Published:2018-06-06

摘要/Abstract

摘要：

在深水钻井过程中，水下的低温、高压环境使钻井液黏度迅速增加，造成当量循环密度（ECD）增大，由此引发井塌、井漏以及压力控制难等问题。采用乙烯基己内酰胺（NVCL）作原料，偶氮二异丁腈（AIBN）作引发剂，通过自由基聚合的方式对深水水基钻井液低温流变性具有调控作用的温敏聚合物—聚N-乙烯基己内酰胺（PVCL）进行合成。通过红外光谱、凝胶渗透色谱等方法对PVCL进行了结构表征和分子量测定，并研究了矿化度、pH值、PVCL浓度等因素对其低临界溶解温度（LCST）的影响。实验结果表明，PVCL有着较强的抗温、抗盐能力，能够使水基钻井液塑性黏度、表观黏度和动切力在4~60℃范围内变化减小50%。

关键词: 深水钻井液, 温敏聚合物, 聚N-乙烯基己内酰胺, 低临界溶解温度, 低温流变性

Abstract:

In the process of deep water drilling, the viscosity of drilling fluid increases rapidly due to underwater low-temperature and high-pressure environment, which results in the increase of equivalent circulation density (ECD). Therefore, the problems such as well collapse, loss and pressure control have been induced. Adopting NVCL as material and AIBN as initiating agent, the thermo-sensitive polymer-poly N-vinyl caprolactam (PVCL)applicable for low-temperature rheology control of deep water-based drilling fluid is synthetized by the means of free-radical polymerization. Using methods such as the IR spectrum and gel permeation chromatography (GPC), the structure characterization and molecular weight determination of PVCL are conducted. Moreover, a research is done on how the factors such as salinity, pH value and PVCL concentration influence the lower critical solution temperature (LCST). The experiment results show that PVCL has high temperature resistance and salt tolerance, leading to the changes in plastic viscosity, apparent viscosity and yield point of water-based drilling fluid decreased by 50% within the temperature of 4-60℃

Key words: deepwater drilling fluids, thermo-sensitive polymer, poly N-cinyl caprolactam, lower critical solution temperature, low-temperature rheology

中图分类号:

TE254.1

徐加放, 丁廷稷, 张瑞, 张振越, 顾甜甜, 程远方, 王志远. 水基钻井液低温流变性调控用温敏聚合物研制及性能评价[J]. 石油学报, 2018, 39(5): 597-603.

Xu Jiafang, Ding Tingji, Zhang Rui, Zhang Zhenyue, Gu Tiantian, Cheng Yuanfang, Wang Zhiyuan. Development and performance evaluation of thermo-sensitive polymer for low-temperature rheology control of water-based drilling fluid[J]. Acta Petrolei Sinica, 2018, 39(5): 597-603.

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水基钻井液低温流变性调控用温敏聚合物研制及性能评价

Development and performance evaluation of thermo-sensitive polymer for low-temperature rheology control of water-based drilling fluid

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