孤岛中二区低张力泡沫驱油体系性能研究

以孤岛中二区油藏为目标区块,研制了适合油藏条件的低张力泡沫驱油配方,通过泡沫性能评价、泡沫体系与地层油水界面性能测定及物理模拟试验,研究了低张力泡沫体系的泡沫性能、油水界面性能及泡沫体系在多孔介质中的封堵能力、提高采收率的能力、驱替过程中产出液含水变化及注采压差变化。试验证明,低张力泡沫体系集合了泡沫及活性剂驱油体系的特点,具有强调剖及强洗油的双重作用,泡沫的高视黏度及选择性封堵提高了驱油体系的波及面积,低张力泡沫体系的高界面活性提高了驱油效率,减少了油藏的残余油的存在,使泡沫体系更稳定,注入低张力泡沫体系后,综合采收率提高28%。

Performance Research of Ultra-low Interfacial Tension Foam Flooding System of Gudao Second District

Inthis paper,the reservoir of Gudao second district is a target area,and low interfacial tension foam flooding system to adapt to reservoir condition is developed.Through performance evaluation of foam,foam system interfacial properties and simulation test,foam performance,oil-water interfacial properties and block pressure in porous media,the ability to enhance oil recovery,different pressure changes and cut water changes are studied.Testing proves that the low interfacial tension foam flooding system has the characteristic of foam and surfactant.It can be on the double action of powerful washing and adjusting.Foam selective plugging and high apparent viscosity increase flooding systems affected area,and the activity of low interfacial tension foam system increase the displacement efficiency,and reduce the presence of residual oil,so that the foam system is more stable after injecting the foam system,the integrated oil recovery increased by 28%.