水基压裂液对砂岩储层岩心zeta电位的影响  

Effects of Water Base Hydrofracturing Fluids on Zeta Potential of Sandstone Reservoir Rock Core in Aqueous Media

作　　者：徐婷[1] 张士诚[1] 马新仿[1] 

机构地区：[1]中国石油大学石油天然气工程学院,北京昌平102200

出　　处：《油田化学》2009年第1期31-34,14,共5页Oilfield Chemistry

摘　　要：采用电泳法研究了延长8砂岩储层岩心在不同pH值的不同介质中的zeta电位,结果如下。在去离子水中zeta电位为负值,随pH增大而减小,pH为10-11时减小幅度大;在矿化度59.64 g/L、CaCl2水型的地层水中,pH〉10.5后先增大后减小;HPG/硼砂压裂液对zeta电位影响不大,但较高pH值的碱性条件对地层伤害较大,破胶后对地层的伤害减小;在阴离子型VES压裂液中zeta电位基本保持稳定,几乎不造成地层伤害。对上述实验结果作了解释和分析。列出了pH值6.5-13.3、时间3、5、7分钟时,该岩心在HPG压裂液中的zeta电位、电泳迁移率、电导率值,说明测定误差产生原因是岩心粒径小、悬浮液不稳定。The zeta potential of sandstone reservoir rock core of Yanchang 8 Formation in aqueous media was studied by using electrophoretic method and following results were obtained. The zeta potential of the core in deionized water, being negative, decreased continuously with increasing pH value and more sharply in pH range 10--11 ; the zeta potential in a formation water of CaCl2 type with TSD =59. 64 g/L maintained practically steady at pH 〈 10. 5 and then notably rised and dropped down;an HPG/berate hydrofraeturing fluid（HFF） influenced the zeta potential very little but might cause some formation damage,which was reduced in the broken HFF;tbe zeta potential kept much more stable in an anionic VES HFF; which practically caused no formation damage. The above presented results were explained and analyzed. The values of zeta potential, electropberetie mobility, and electric conductance of the core in HPG/ borate HFF in 3,5 and 7 min at pH ranged in 6. 5--13.3 were tabulated to show the error of determinations possibly existed,which appeared to be created owing to the unstability of the aqueous suspension of the small size core particles.

关 键 词：ZETA电位 砂岩储层岩心 水基冻胶压裂液 胶束凝胶压裂液 地层伤害 

分 类 号：TE357.12[石油与天然气工程—油气田开发工程] TE258.3