天然气工业2017，Vol.37Issue(6)：72-78,7.DOI:10.3787/j.issn.1000-0976.2017.06.010
聚乙烯醇凝胶堵漏剂的室内研究
A laboratory study on a PVA gel plugging agent
摘要
Abstract
In this paper,a new PVA gel plugging agent was developed to deal with lost circulation.It is composed of polyvinyl alcohol (PVA),sodium borate,dibutyl and sodium carboxymethyl cellulose obtained through chemical crosslinking reaction.According to the performance requirements on plugging materials used for geological exploration drilling,this plugging agent was tested in terms of its gelling time,gelling viscosity,swelling,anti-dilution,mineral pollution resistance and plugging property.It is shown that the PVA gel plugging agent has the best performance when it is prepared with 3％ PVA,0.8％ sodium borate,0.3％ Dibutyl,0.3％ sodium salt of carboxymethyl cellulose(C-MC-Na) in the environment with crosslinking temperature at 35 ℃ and pH value at 10.Its gelling viscosity is 358 600 mPa · s and gelling time is 18 min.The gelling time is adjustable between 0.1 h and 1.0 h,well adapting to different channels.Besides,the maximum pressure resistance of an individual gel plugging agent is 6.0 MPa,and it increases to 7.0 MPa after 1％ wood dust is added,presenting a good plugging effect.It is concluded that this PVA gel plugging agent is advantageous with strong swelling,anti-dilution,mineral pollution resistance and plugging capacity.Moreover,its preparation is convenient with a low cost.Therefore,it can be used in fractures,caverns,pores and complex thief zones with movable water.关键词
地质钻孔/漏失/裂缝/溶洞/堵漏/聚乙烯醇凝胶/堵漏剂/实验室试验Key words
Geological drilling/Loss circulation/Fracture/Cavern/Plugging, PVA gel/Plugging agent/Laboratory test引用本文复制引用
彭振斌,张闯,李凤,林守新..聚乙烯醇凝胶堵漏剂的室内研究[J].天然气工业,2017,37(6):72-78,7.基金项目
中南大学中央高校基本科研业务费专项资金资助(编号:2016zzts435). （编号:2016zzts435）
