液体药高能气体-水力复合压裂技术的研究及应用

Research and Application of the Technology of Liquid Powder-High Energy Gas and Hydraulic Composite Fracturing

朝阳沟油田为提高低渗透储层的产能和采油强度,采用液体药高能气体-水力复合压裂技术对储层进行改造。对液体药的配方进行了优选,确定了合适的配比范围:氧化剂(NH4NO3),50%～60%;燃烧剂(甘油),10%～20%;水,25%～30%;敏化剂,5%。按此配方配制的液体药的火药力为0.74MJ/kg,燃烧条件为压力10MPa、温度300℃。介绍了液体药高能气体-水力复合压裂技术的现场施工工艺步骤和辅助设计参数。朝阳沟油田某区块南部的2口井现场试验结果表明,液体双基药柱爆炸对套管将不产生破坏性影响,加大水力压裂施工排量有利于扩展和延伸液体药在井内爆炸形成的径向裂缝,从而达到建立有效驱动体系,提高低渗透储层的产能和采油强度的目的。2口试验井增产效果显著,初期单井日增液2.2t/d,日增油2.2t/d,采油强度增加0.44t/(d·m),累计增产原油4105.2t。

The technology of liquid powder-high energy gas and hydraulic composite fracturing is applied for reforming to enhance productivity and intensity of oil production in the low-permeability reservoir in Chaoyanggou oilfield.The formula of the liquid powder is fixed after optimization：50% to 60% of NH4NO3,10% to 20% of incendiary agent,25% to 30% of water and 5% of sensitizer.Efficacy of this optimized liquid powder is 0.74MJ/kg at 10MPa and 300℃.The process and designed parameters of the technology applied in the field are introduced.The application result of the technology in two wells in the south of certain block of Chaoyanggou oilfield presents that the explosion of the liquid powder has no destructive effect on casing,and more discharge rate of hydraulic fracturing is favorable for radial fracture expansion formed by the explosion.Effective drive system will be built and the productivity and intensity of oil production will be enhanced in the low-permeability reservoir.Stimulation is obvious in two wells with the results of 2.2t/d of both daily incremental liquid and oil production for single well at early stage.The intensity of oil production increased by 0.44t/（d·m） and cumulative incremental oil production was 4105.2t.