泥饼对钻井液用小分子抑制剂的阻挡作用  

Blocking Effect of Mud Cake on Small Molecular Inhibitors Used in Drilling Fluid

作　　者：董汶鑫 蒲晓林[1] 任研君 王梓豪 翟玉芬 王红彬 DONG Wenxin;PU Xiaolin;REN Yanjun;WANG Zihao;ZHAI Yufen;WANG Hongbin(State key Laboratory of Oil and Gas Reservoir Geology and Development(Southwest Petroleum University),Chengdu,Sichuan 610500,P R ofChina;College of Chemistry and Chemical Engineering,Southwest Petroleum University,Chengdu,Sichuan 610500,P R of China)

机构地区：[1]油气藏地质与开发国家重点实验室(西南石油大学),四川成都610500 [2]西南石油大学化学化工学院,四川成都610500

出　　处：《油田化学》2019年第1期23-26,32,共5页Oilfield Chemistry

基　　金：国家科技重大专项"深井超深井钻井关键技术与装备"(项目编号2011ZX05020-004);青年科学基金项目"高温深井油基钻井液可逆特性与CO2/N2诱导机理研究"(项目编号51804263);油气藏地质及开发工程国家重点实验室(西南石油大学)开放基金资助项目"无机/有机纳米复合材料体系构建及页岩封堵抑制性能研究"(项目编号PLN201814)

摘　　要：水基钻井液中常加入大量的表面水化抑制剂,却未能有效提高井壁稳定性,造成钻井成本高、回收处理难、环境污染大等问题。因而提出小分子表面水化抑制剂能否有效进入地层这一问题。以抑制效果佳且分子量最低的表面水化抑制剂己二胺为研究对象,采用柱前衍生液相色谱法及线性膨胀实验研究了不同类型泥饼对己二胺的阻挡作用以及滤液的抑制性变化。结果表明,泥饼对抑制剂的阻挡作用不可忽略,45%数90%己二胺不能有效进入地层,己二胺钻井液滤液对岩心水化膨胀的抑制性明显降低,泥饼对抑制剂存在吸附与束缚作用,诠释了现场加入过量抑制剂而不能有效提高井壁稳定性这一问题。A large number of surface hydration inhibitors were often added into water-based drilling fluid,which could not effectively improve the wellbore stability,resulting in high drilling cost,difficult recovery and treatment,and great environmental pollution and so on. Therefore,this paper doubted whether small molecules could effectively enter the formation. Taking hexanediamine,a surface hydration inhibitor with the best inhibition effect and the lowest molecular weight,as the research object, the blocking effects of different mud cakes on the infiltration of hexanediamine into the formation and the inhibition changing of filtrate were studied experimentally by the precolumn derivatization of liquid chromatography and linear expansion experiment. The results showed that the blocking effect of mud cake on inhibitor could not be negligible and 45%-90% hexanediamine could not effectively enter the formation. The inhibition of the filtrate of hexanediamine drilling fluid on the core hydration expansion was reduced obviously. There were adsorption and binding actions between inhibitors and mud cakes,which illustrated the reason why the excessive inhibitor could not effectively improve the stability of wellbore.

关 键 词：水化失稳 水基钻井液 小分子抑制剂 己二胺 泥饼 阻挡 

分 类 号：TE254[石油与天然气工程—油气井工程]