提高油基水泥浆堵水材料封堵强度的研究

油基水泥浆是一种常用的选择性堵水材料,由于硬化油基水泥石体系中存在未完全置换的油相,对体系孔隙结构和力学性能均产生不利的影响.从优化油基水泥浆配方(选择润湿分散剂和其它外加剂)入手,提高油基水泥硬化体中的水化产物体积,从而改善界面胶结强度,降低有害孔比率,提高硬化油基水泥石的抗压强度.试验研究了不同种类的化学外加剂和外掺料对硬化油基水泥石抗压强度的影响,结果表明:掺加FeCl3、硅灰和F17A的油基水泥石,其抗压强度提高程度最为显著,三者复合(1?Cl3 5%硅灰 3?7A)效果最佳.扫描电镜(SEM)和汞侵入法(MIP)分析结果证实,体系抗压强度的增加源于硬化体孔隙结构的改善,即大孔的减少和致密程度的提高.

Improving plugging performance of oil based slurry

Oil based slurry is an ordinary selective water shutoff material. The incomplete displacement of oil in hardened slurry does great harm to the pore structure and mechanical properties. Based on oil based slurry formulation optimization, hydrate volume percent in set oil based slurry was increased to improve interfacial bonding strength and to reduce detrimental pore ratio, then better strength of set oil slurry. Some admixtures which may affect the compressive strength of hardened oil based slurry were studied to improve the mechanical properties and the specimen with 1%FeCl3 +5%silica fume + 3%F17A added showed the best results. SEM and MIP analyses showed that the "mechanical property enhancement came from the improvement of pore structure, mainly the decrease of large pores and the increase of compact density.