自生热泡沫体系在多孔介质中协同作用机制

Mechanism study of a chem-pyrogenic-foam system in porous media

自生热泡沫体系是将自生热体系和泡沫流体相结合得到的体系。设计研发自生热泡沫多孔介质反应测量装置,包括注入系统、测量系统及出口计量系统,用于研究自生热泡沫体系在多孔介质中的作用机制。研究表明:自生热泡沫体系在多孔介质中呈现出化学反应与泡沫的协同作用,泡沫可以调节化学反应温度分布,使化学反应产热均匀加热岩心,并延缓后续热量散失;利用化学药剂在地层中反应产生泡沫,可以增强泡沫封堵性能;在岩心内部,化学反应程度随渗透率增加而增加,最高反应程度约50%,但泡沫不影响化学反应程度。通过理论计算验证了试验结果的正确性,该体系尤其适用于海上稠油开采。

A chem-pyrogenic-foam system can be formulated by combining chemicals with pyrogenic capability and foam fluids. In this study, a core flooding device was designed and used for studying the process of chem-pyrogenic-foam in porous media, which can simulate the injection of chemicals and measure the reaction products. The results show that the chem-pyrogenic-foam system can provide a synergistic effect on chemical reaction and foam generation. The formation of foams can adjust the temperature distribution, which makes heat more uniformly distributed along the core and can reduce the heat loss. Using chemical agents to generate foam in-situ in the formation can enhance the sealing performance of the foam in the core. The chemical reaction can be promoted with the increase of the permeability of the core, and a conversion rate of 50% can be achieved. The foams formed in the porous media have little effect on the process of chemical reaction. The experimental results were also analyzed via theoretical calculation. The chem-pyrogenic-foam system is particularly suitable for offshore heavy oil recovery where gas injection for foam generation is not available.