致密气藏用纳米泡沫压裂液研究

Study on nano-foam fracturing fluid for tight gas reservoirs

选择使用不同的纳米颗粒和表面活性剂的组合配制泡沫压裂液,用于致密气油藏压裂。添加纳米氧化铁颗粒可以提高泡沫压裂液的热稳定性。在表面活性剂(SDBS和CAPB)的混合物中添加质量分数为0.5%的纳米氧化铁作为泡沫稳定剂,改善了泡沫的流变性,可使其在80℃下的热稳定性提高52%。优化后泡沫体系的表观黏度受泡沫稳定性的影响,泡沫流体的弹性在黏性上占主导地位,有助于提高支撑剂悬浮能力,能有效地通过泡沫液输送支撑剂,较好地满足了现场允许的支撑剂沉降速率要求,并用于致密气油藏的压裂过程中。

Different combinations of nano-particles and surfactants are selected to prepare foam fracturing fluid for tight gas reservoirs fracturing.The thermal stability of foam fracturing fluid is improved by adding nano iron oxide particles.Adding(w)0.5%nano iron oxide as foam stabilizer to the mixture of surfactant(SDBS and CAPB)can improve the rheology of the foam and increase its thermal stability at 80℃by 52%.The apparent viscosity of the optimized foam system is affected by the foam stability.The elasticity of the foam fluid is dominant in viscosity,which can help to improve the proppant suspension ability.It can effectively transport the proppant through the foam fluid,which can better meet the requirements of the allowable proppant settling rate and be used in the fracturing process of tight gas reservoirs.