摘要
针对低孔低渗储层开发过程中极易受到水锁损害的问题,利用氟碳类超低表面张力单体通过分步乳液聚合法,研制了一种分子结构中包含玻璃化温度较高的硬单体、附着能力较强的软单体以及具有全氟烷基侧链功能单体的钻井液防水锁剂FCS。室内实验表明,加入FCS后水溶液的表面张力能够降低至20 mN/m以内,使油水界面张力降低至0.25 mN/m,其能与多孔介质表面形成化学键,与岩石表面形成多点连接的稳定吸附,使其表面润湿性转变为疏油疏水的低能表面,大幅度降低多孔介质的毛管力,提高渗透率恢复值,测得的恢复率高达87.5%。该防水锁剂具有明显的降低水锁损害作用,对改善低孔低渗油气藏的开发具有重要意义。
A water blocking prevention agent,FCS,is developed to deal with water blocking hazard in low porosity low permeability reservoir development.FCS is synthesized with multistage emulsion polymerization using ultra-low surface active tension fluorocarbon monomers.FCS has hard monomers of high glass transition temperature,soft monomers of stronger adhesive capacity,and monomers with whole fluorine alkyl functional side chains in its molecular structures.Laboratory study shows that the addition of FCS in water reduces the surface tension of water to less than 20 mN/m.FCS can form chemical bonds with the surfaces of porous media,and multipoint linking stable adsorption on the surface of rocks,changing their surface to organophilic status and greatly reducing the capillary forces of porous media.In the study,the recovery permeability rates of rocks treated with FCS solution are as high as 87.5%.FCS is expected to play an important role in the development of low porosity low permeability reservoirs.
出处
《钻井液与完井液》
CAS
北大核心
2014年第2期9-12,95-96,共4页
Drilling Fluid & Completion Fluid
基金
国家自然科学杰出青年科学基金项目(50925414)
国家高技术研究发展计划(863计划)(2013AA064803)
关键词
防水锁剂
低孔低渗储层
水锁损害
分步乳液聚合
表面张力
毛管力
Water blocking prevention agent
Low porosity low permeability reservoir
Water blocking damage
Multistage emulsion polymerization
Surface tension
Capillary force
