油井水泥降失水剂的作用机理研究  

Mechanisms involved in fluid loss control of oilwell cement slurries by water-soluble polymer

作　　者：刘学鹏[1] 刘仍光[1] LIU Xue - peng;LIU Reng - guang(SINOPEC Petroleum Engineering Research Institute, Beijing, 100101,China.)

机构地区：[1]中国石化石油工程技术研究院,北京100101

出　　处：《化学研究与应用》2017年第12期1928-1932,共5页Chemical Research and Application

基　　金：国家科技重大专项课题<海相气井固井完井技术>(2011ZX05005-006-004)资助;中石化科技攻关项目<温度广谱型油井水泥缓凝剂和降失水剂开发>部分研究内容

摘　　要：本文从失水量、滤液粘度和滤饼结构等试验数据出发,阐释了聚乙烯醇降失水剂和AMPS聚合物降失水剂的作用机理。研究结果表明,聚乙烯醇降低失水量的主要原因不是其对水泥浆的增粘作用,而是其对滤饼渗透率的降低,即在滤饼和过滤介质表面形成的一层致密聚合物膜;AMPS聚合物降失水剂是靠改变滤饼电性,增加滤液粘度发挥作用。Nowadays,most of knowledge about the function mechanisms of fluid loss control agent is a conjecture without the support of laboratorydate.Inthispaper,the function mechanisms of polyvinyl alcohol(PVA)and AMPS polymer fluid loss additive were first systematically discussed by determining the quantity of fluid loss,filtrate viscosity and the electrophoretic mobility of filter cake fines.The results show that main factors in FL reduction by PVA is not viscosifying effect but reduction in filter cake permeability:a tough,monolithic and compact polymer film is formed on the filter membrane surface under the filter cake so that the FL is not increased notably meanwhile the film formed with PVA starts to destroy and this results in abrupt increase of FL.AMPS polymer to play the role of fluid loss is to change the filter cake electrical properties,increase the filtrate viscosity.

关 键 词：油井水泥 降失水剂 聚乙烯醇 AMPS聚合物 作用机理 

分 类 号：O631.21[理学—高分子化学]