Foam technology for improving development effect of intermission steam flooding

Intermission steam flood is an effective way to improve the recovery rate of thermal recovery blocks.Along with the increasing turns of steam flooding,severe steam channeling occurs between steam injection wells and production wells,making production performances get worse dramatically.For this reason,this paper conducts the research on plugging off steam channeling by using high temperature foam to enhance recovery degree during steam flooding.Physical simulators and high temperature interfacial tensiometers of steam flooding are utilized to evaluate the displacement performance and surface tension of foaming agent suitable to various temperatures.The most favorable temperature to different kinds of foaming agent is identified.Optimal research is carried out on the field injected gas-liquid ratio and injection way to find out the on-site construction method.It is indicated that the effect of injecting the complex foaming agent of FCYL and FCYH is better than that of injecting the single-pure foaming agent.The displacement efficiency increases by 30 percent after being injected both steam foaming agent and nitrogen foaming agent.The high temperature foam technology is applied to the intermission steam flooding test of the 56-10-X8 single well group of Shengli Oilfield in 2004.On-site application shows that compound high temperature foam systems can be used to improve the development effect of intermission steam flooding in heavy oil reservoir under thermal production and effectively enhance the recovery rate of thermal heavy oil reservoirs.