The Study Of Non Hydrocarbon Assisting Steam Stimulation Technology In The XiaoWa Oil Field

The application of nitrogen foam auxiliary steam stimulation technique is widely used in domestic and abroad,and is one of the effective measures to improve the recovery rate of thermal recovery Wel s.In this paper,east three section of Xiaowa oilfiled has been takanawa time stimulation stage,development effect gradually becomes poor.According to the problem,Xiaowa oil field has conducted nitrogen foam-assisted steam puffing test,which has achieved certain effects,but the site is suitable for the technology of well location,foaming agent and process parameters on the performance of it remains to be further research.Therefore,article on the basis of the early stage of the field test,using mathematical method,laboratory experiment and numerical simulation method,the target blocks of nitrogen foam auxiliary steam stimulation technology optimization,in order to solve many rounds stimulation effect variation problem,improve the block throughput stage of recovery.In this paper,the experimental results of nitrogen foam assisted steam stimulation in the target block are evaluated firstly and the reasons for the poor results of some measures are analyzed.On this basis,the influencing factors of nitrogen foam-assisted steam stimulation are studied,and the reservoir conditions and development conditions suitable for nitrogen foam-assisted steam stimulation are obtained.By analogy method,engineering analysis method and grey grade-fuzzy comprehensive evaluation method,the well selection method of nitrogen foam auxiliary steam stimulation is established.The properties of the four selected foaming agents were evaluated by laboratory experiments.Based on the optimization of the foaming agent for the auxiliary steam stimulation of nitrogen foam,the plugging capability of nitrogen foam under different gas-liquid ratio,concentration,temperature and permeability was analyzed by using a single pipe sand fil ing model.By using the numerical simulation software,the historical fitting and the optimization of nitrogen foam auxiliary steam parameters in well w31-39 were carried out.the results show that optimal injection foam slug first,then the injection of nitrogen,the injection of steam injection,foaming agent cycle injection rate of 250 m~3,nitrogen integrating than 50:1 to 60:1,nitrogen injection rate1000 Nm~3/h,liquid withdrawal rate 25m~3/d stimulation effect is better.