摘要
在高温、低孔低渗储层压裂改造中,常用的瓜胶压裂液浓度一般为0.45%～0.50%,瓜胶的浓度高,对储层的伤害大,且近年来瓜胶的价格明显上涨,施工费用增加。因此优选了性能优异的超级瓜胶、表面张力小的助排剂,并研制出水解半径大的复合型多头交联剂,最终得到耐高温低浓度瓜胶压裂液,该压裂液瓜胶质量分数为0.30%～0.35%时,耐温达130℃（黏度小于8 m Pa·s）,具有破胶彻底、低残渣（117 mg/L）、对岩心的伤害率小于10%、流变性能好等优点。该压裂液在塔河535井现场应用取得了显著效果。
Fracturing fluids containing 0.45%–0.50% guar gum had always been used in the stimulation of high temperature, low porosity, low permeability reservoirs. High concentration of guar gum resulted in serious damages to reservoirs and high operation cost. Laboratory studies had been conducted to try to minimize the use of guar gum and to enhance the thermal stability of fracturing fluids. A high performance guar gum and a cleanup additive of low surface tension were selected for use with the newly developed multi-group crosslinker with bigger hydrolysis radius. Using these additives, a fracturing fluid with high thermal stability and low guar gum concentration was developed. This fracturing fluid had guar gum concentrations of 0.30%–0.35%, with its properties remained stable between 120–130 ℃. This fracturing had the advantages of complete gel breaking(η<8 m Pa·s), low residue(117 mg/L), slight damage to reservoir permeability(<10%), and good rheology. It was successfully used in fracturing operation in the Well Tahe535.
出处
《钻井液与完井液》
CAS
北大核心
2015年第5期86-88,107,共3页
Drilling Fluid & Completion Fluid
基金
国家科技重大专项课题6"缝洞型碳酸盐岩油藏高效酸压改造技术"(2011ZX05014-006)
关键词
增产措施
压裂液
交联剂
低伤害
耐温性
Stimulation
Fracturing Fluid
Crosslinker
Low Damage
Tolerance to high temperature
