新型超高温压裂液体系研制与评价

The Development and Evaluation of a New Ultra-high Temperature Fracturing Fluid

目前中国常规的压裂液体系仅适用于温度在150℃以下的地层,迫切需要开发一种能应用于超高温(180℃以上)储层的新型低伤害压裂液体系。在室内对影响超高温压裂液性能的主要添加剂———稠化剂和交联剂进行了改性,考察了影响超高温改性瓜胶产品性能的主要因素,确定出了其合理的工艺条件,并通过严格控制反应条件,向有机硼中引入有机锆络合物,获得了交联剂BA1-21。以改性瓜胶和交联剂BA1-21为主剂成功研制出耐温在190℃以上的超高温压裂液体系。该交联体系与常规交联体系相比,具有更好的耐温抗剪切性能、破胶水化彻底,且对岩心渗透率的伤害程度较低。该技术对深层超高温储层压裂具有一定的指导意义。

The fracturing fluids presently provided in China are generally for use below 150 ℃,and fracturing fluids for use in 180 ℃ and above are rarely found.By introducing organo-zirconium complex into organoboron compound,a crosslinking agent,BA1-21,is developed under strictly controlled reaction condition.Using modified guar gum and BA1-21 as the primary additives,a fracturing fluid for use in 190 ℃ was formulated.Compared with other fracturing fluids,this fracturing fluid has better high temperature shear thinning property,a more complete gel breaking,and lower impairment to reservoir rock permeability.