高温清洁压裂液在塔河油田的应用

Application of high temperature clean fracturing fluid in Tahe oilfield

清洁压裂液适用于低渗透储层的压裂,但是耐温性能差.针对塔河油田碎屑岩储层渗透率低、温度高的特点,优选高温清洁压裂液主剂,优化高温清洁压裂液配方,开发一种新的高温清洁压裂液体系,通过实验进行性能评价.结果表明:该压裂液体系耐温达到130℃,优选配方为D2F-AS11(4.0%)+KCl(3.0%)+EDTA(0.2%)+KOH(0.6%),抗剪切性能好,携砂能力强,与地层水混合后即能破胶,对储层的伤害非常低,现场应用增油效果明显.

Clean fracturing fluid is appropriate for low permeability reservoir fracture,but its temperature resistance is poor.We invent a new high temperature clean fracturing fluid system for Tahe oilfield whose reservoir is of low permeability and high temperature by optimizing host agents and formulas of high temperature clean fracture fluid.The new formula is D2F-AS11(4.0%)+KCl(3.0%)+EDTA(0.2%)+KOH(0.6%),which can resist a temperature as high as 130℃.Laboratory evaluation shows the new fracture fluid system offers outstanding shear resistance with strong proppant carrying ability,can be gel breaking after mixed with formation water with no harm to reservoir.It has obvious effect on enhancing oil.