江苏油田水力压裂裂缝导流能力提高方法实验研究

Experiment study on the methods to improve hydraulic fracture conductivity in Jiangsu oilfield

裂缝导流能力是影响水力压裂改造效果的重要因素。目前,胍胶压裂液得到广泛应用,但其中含有的水不溶物以及破胶后形成的残渣会对裂缝导流能力造成一定伤害,从而降低压后增产效果。本文针对江苏油田压裂现状,研究了胍胶压裂液对裂缝导流能力的伤害程度,分析了压裂液对裂缝伤害的机理,提出了裂缝导流能力的提高方法。研究表明稠化剂浓度、支撑剂铺置方式的优化以及羧甲基胍胶压裂液、生物酶破胶剂的应用,可以有效降低胍胶压裂液对裂缝导流能力的伤害。研究结果对压裂液的优选、压裂设计方案的优化具有指导意义。

The propped fracture conductivity is an important factor to influence the effect of fracturing. Now, gel fracturing fluid is widely used, but the water-insoluble solid and the residue after gel-breaking can cause damage to the fracture conductivity, which will reduce the stimulation effect. In this paper, according to the current situation of fracturing in Jiangsu oilfield, the damage degree and mechanism of gel fracturing fluid to conductivity are studied,besides, the methods to improve the propped fracture conductivity are researched. The research indicates that the optimized concentration of gel fracturing fluid and filling mode of fracturing proppant, the application of CMG fracturing fluid and enzyme breaker can reduce the damage of the gel fracturing fluid to the fracture conductivity. According to the results,the optimization of fracturing fluid, the design of fracturing solution can be guided.