三相泡沫体系堵水效果及影响因素实验研究

Experimental study on water plugging effect and influence factors of three phase foam system

纳米颗粒作为新型稳泡材料,能够显著提高泡沫稳定性,其研究和应用受到石油科技工作者的广泛重视。针对渤海油田堵水技术需求,以物理化学、高分子材料学和油藏工程等为理论指导,以仪器检测、化学分析和物理模拟等为技术手段,以渤海典型油藏地质特征和流体为研究对象,开展了纳米颗粒氮气三相泡沫体系基本性能评价和堵水效果物理模拟研究。结果表明,当起泡剂(PO-FASD)和稳泡剂(SiO2纳米颗粒AEROSIL380)浓度为0.3%左右时,起泡剂和稳泡剂水溶液与氮气可以形成性能优良的三相泡沫体系。随储层渗透率级差增加,水驱开发效果变差,泡沫堵水增油效果提高。随水驱采出程度增加,泡沫堵水增油效果提高。随原油黏度增加,泡沫堵水增油效果变差。由此可见,三相泡沫体系具有良好封堵和液流转向能力,尤其适合于高含水油藏高渗透层堵水施工。

As a new type of foam stabilizing material,nano-particles can significantly improve the stability of foam.The research and application of nano-particles have been paid much attention by petroleum researchers.Considering the demand of water plug.ging technology in Bohai Oilfield,and guided by the theory of physical chemistry,polymer materials and reservoir engineering,we studied the evaluation of basic performance and the physical simulation of water plugging effect of nano-particle nitrogen foam sys.tem according to the geological characteristics and fluids of typical reservoirs in Bohai by technical means such as instrument detec.tion,chemical analysis and physical simulation.The results showed that when the concentration of foaming agent(PO-FASD)and stabilizer(SiO2 nano-particle AEROSIL380)were about 0.3%,the foaming agent and foam stabilizer could form the three phase foam system with nitrogen in excellent performance.With the increase of the reservoir permeability gradation,the effect of water flooding development got worse,and the effect of foam plugging and increasing oil increased.While with the increase of the water flooding recovery,the effects of foam plugging and oil increasing effect were improved.However,if the viscosity of crude oil in.creased,the effects of foam plugging and oil increasing effect would get worse.Thus,we could find that the three-phase foam sys.tem has good plugging and liquid flow steering ability,especially suitable for high water cut reservoir high permeability layer water plugging.