A Numeric Simulation Research On High Temperature Foam With Stiff Particle Compound Plugging And Profile-control

It has been proved from many laboratory and field experiments that injecting foam with steam is a effective profile-control measurement in view of great quantity losses of steam and low volumetric sweep efficiency causing by injecting steam cross-flowing in the reservoir owing to heterogeneity, viscosity difference, the gravity differentiation in the development of injecting steam. With the existence of high permeability layer, high permeability strip, it can result to poor foam profile-control effectiveness, even no effectiveness, so it is necessary injecting stiff particle, plugging the high permeability layer, high permeability strip, then injecting high temperature foam system with steam to operate compound plugging. The key of successful compound plugging is figuring out the mechanism of compound plugging. In light of research to high temperature foam at home and abroad. Based on the laboratory experiments at home and abroad, this article depict the rule of the stiff particle moving in the porous system, build a stiff particle moving mathematical model, perfect the high temperature foam and stiff particle compound plugging-control mathematical model, the numerical calculating model of the mathematical model was built. in the basis of the above mentioned, the program of numeric simulating model was developed. With the program, a group of inverted nine-points scheme was simulated and calculated, through the results of the simulation, the sensitivity of each compound plugging-control parameters are summed. The results demonstrate that:①the cumulative oil production display ascending tendency versus measurement season;②the cumulative oil production display initial ascending and then descending tendency versus suspension liquid concentration;③the cumulative oil production display ascending tendency to a little extent versus suspension liquid slug size;④the cumulative oil production display sharp descending tendency versus injecting steam rate;⑤the cumulative oil production display initial ascending and then descending tendency versus nitrogen amount;⑥the cumulative oil production display initial sharp ascending and then keep at a const versus surfactant concentration;⑦the cumulative oil production display descending tendency versus foam season. At last, with the method built in the paper, a practical work area was researched, based on the reliable history matching results, analyses the distribution of the remaining oil, at last optimize the parameters and it also proved the reliability of method mentioned in the paper.