摘要
针对油气井钻井工程中抑制泥页岩水化的难点,基于分子结构优化设计,研制出了新型聚胺页岩抑制剂SDPA.SDPA为含有胺基和醚键等多官能团的低分子聚合物.三次岩屑回收率实验和膨润土造浆实验表明,新研制的聚胺具有优异的抑制性能,且作用时间长,优于国外同类产品.采用吸附、Zeta电位测试、XRD、接触角测量和元素分析等方法对SDPA的作用机理进行了分析.结果表明:SDPA在黏土颗粒表面为单层吸附,质子化铵离子交换出层间水化阳离子,降低黏土颗粒水化斥力;静电引力和氢键共同作用将黏土颗粒层间吸附的水分子排挤出来,压缩晶层间距;SDPA分子中疏水部分覆盖在黏土颗粒表面形成疏水屏障,防止水分子吸附;SDPA在黏土颗粒表面不易解吸,能发挥长期抑制作用.现场试验表明,聚胺水基钻井液抑制性强,性能稳定且易维护,满足现场钻井工程需要.
Aimed at the difficulty of shale hydration in oil and gas well drilling engineering,a new polyamine shale inhibitor SDPA was synthesized based on the optimization design of molecular structure. SDPA is a low molecular mass polymer with multi-functional groups such as amine group,ether linkage,etc. Three cuttings recovery experiments and Bentonite mud experiments show that,the polyamine is of excellent inhibition performance to shale hydration,and it has a long-term inhibition. Its performance is better than that of similar foreign products. The inhibitive mechanism of SDPA is analyzed by adsorption test,Zeta potential measurement,XRD,contact angle measurement and element analysis. The results indicate that,SDPA is adsorbed on the surface of clay particles in the form of monolayer. The protonized ammonium ions are adsorbed on the surface of clay particles replace hydration cations between the layers,which reduces the hydration repulsion of clay particles; the coordination of electrostatic attraction and hydrogen bonding expels the water molecules out of clay particle layers,which suppresses the hydration of clay; The hydrophobic part of SDPA molecules covers on the surface of clay particles,which prevents water being adsorbed; SDPA molecules adsorbed on the surface of clay particles is not easy to be desorbed,thus polyamine has long-term inhibition. Field tests show that polyamine water-based drilling fluid is a highly inhibitive,stable shale hydration inhibitor,and it can meet the application requirements of drilling engineering.
出处
《西安石油大学学报（自然科学版）》
CAS
北大核心
2013年第2期72-77,2+1,共6页
Journal of Xi’an Shiyou University（Natural Science Edition）
基金
国家自然科学基金(编号:41072094)
十二五国家科技重大专项(编号:2011ZX05021-004)
中央高校基本科研业务费专项资金(编号:12CX06023A)
中国石油大学(华东)优秀博士学位论文培育计划项目(编号:LW110202A)
关键词
页岩水化抑制剂
聚胺
抵制机理
井壁稳定
shale hydration inhibitor
polyamine
inhibition mechanism
wellbore stability
