三元复合CO_(2)强化泡沫体系的制备及性能研究

Study on preparation and performance of ternary compound CO_(2)enhanced foam system

遇油消泡、高温失活等现象严重影响了泡沫流体在低渗油藏苛刻环境下的应用。采用Waring Blender法优选了性能良好的起泡剂QH-3,加入能提升泡沫稳定性的纳米SiO_(2)颗粒与聚合物PL-1,设计正交实验确定了0.5%发泡剂QH-3+0.2%聚合物稳定剂PL-1+0.3%纳米SiO2颗粒的三元复合CO2强化泡沫体系配方。对常规的QH-3泡沫体系与三元复合CO_(2)泡沫体系开展了性能测试。实验结果表明,三元复合CO2强化泡沫体系具备良好的抗油耐温性能。在85℃下,含油饱和度65.18%,渗透率42.6×10^(-3)μm^(2)的岩心中,注入0.8 PV时阻力因子可达114,显著优于常规泡沫体系,表现出较好的流量控制与封窜能力。

Phenomenon such as defoaming in case of oil and high temperature deactivation have seriously affected the application of foam fluid in the harsh environment of low permeability reservoir.The foaming agent QH-3 with good performance was selected by the Waring Blender method,and the nano-SiO_(2)particles and polymer PL-1 that can improve the foam stability were added.The orthogonal experiment design confirmed the formula of the ternary composite CO_(2)reinforced foam system as:0.5%foaming agent QH-3+0.2%polymer stabilizer PL-1+0.3%nano-SiO_(2)particles.Performance tests were carried out on conventional QH-3 foam system and ternary composite CO_(2)foam system.The experimental results show that the ternary composite CO_(2)enhanced foam system has good resistance to oil and temperature.At 85℃,the core with oil saturation of 65.18%and permeability of 42.6×10^(-3)μm^(2),when 0.8 PV is injected,the resistance factor can reach 114,which is significantly better than the conventional foam system,showing better mobility control and plugging performance.