摘要
基于带有等量阴、阳离子电荷的两性离子聚合物特殊的反聚电解质效应,采用反相乳液聚合法分别研制了高分子量低离子度(HvL)与低分子量高离子度(LvH)两种盐响应型两性离子聚合物。通过核磁共振氢谱与流变性测试分别表征了聚合物的结构与盐响应特性。利用饱和盐膨润土基浆对HvL与LvH进行了单剂评价,并考察了两者配比对基浆表观黏度与滤失量的影响,发现HvL具有更有效的降滤失作用而LvH更利于保持低黏度。以HvL、LvH为核心研制了一种配方简单的饱和盐水钻井液,研究表明,盐响应型聚合物的性能优于钻井液常用的两种抗盐聚合物AM-AMPS阴离子共聚物与AM-AMPS-DMDAAC两性离子共聚物;研制的钻井液具有出色的热稳定性与抗膨润土、泥页岩屑污染的性能,并有一定的抗CaCl2能力;盐响应型聚合物也适用于饱和KCl钻井液,普适性好。
Based on special antipolyelectrolyte effect of zwitterion polymer with same quantity of anionic and cationic charges, we developed two types of salt-responsive polyampholytes, one with high molecular weight and low charge density(HvL) and the other with low molecular weight and high charge density(LvH), by inverse emulsion polymerization. Molecular structure and salt-responsiveness of them were characterized by H-NMR and rheology measurement, respectively. HvL and LvH were evaluated in saturated-salt bentonite suspension and influences of their ratio on apparent viscosity and fluid loss were investigated as well. The results indicate that HvL is better at decreasing fluid loss while LvH is better at maintaining low viscosity. A saturated saltwater drilling fluid centering on HvL and Lv H with simple formula was designed and applied. It is indicated that salt-responsive polyampholytes are fundamentally better than AM-AMPS anionic copolymer and AM-AMPS-DMDAAC amphoteric copolymer. The saturated saltwater drilling fluid has excellent thermal stability, tolerance to bentonite and shale cuttings, and certain resistance to CaCl2. Salt-responsive polyampholytes can be used in KCl saturated drilling fluid, with universal adaptability.
作者
蒋官澄
贺垠博
崔物格
杨丽丽
叶晨曦
JIANG Guancheng;HE Yinbo;CUI Wuge;YANG Lili;YE Chenxi(State Key Laboratory of Petroleum Resources and Prospecting,China University of Petroleum(Beijing),Beijing 102249,China;MOE Key Laboratory of Petroleum Engineering,China University of Petroleum(Beijing),Beijing 102249,China)
出处
《石油勘探与开发》
SCIE
EI
CAS
CSCD
北大核心
2019年第2期385-390,共6页
Petroleum Exploration and Development
基金
国家自然科学创新研究群体项目(51521063)
国家自然科学基金面上项目(51474231)
国家"十三五"科技重大专项(2017ZX05009-003
2016ZX05020-004
2016ZX05040-005)
关键词
盐响应性
反聚电解质效应
两性离子聚合物
饱和盐水钻井液
salt-responsiveness
antipolyelectrolyte effect
polyampholyte
saturated saltwater drilling fluid
