Research And Application Of Edge Water And Bottom Water Shutoff In Heavy Reservoir

In developing edge water and bottom water heavy oil reservoir by heating, due to the invading and coning of edge water and bottom water, area water cut increased very fast, as a result, common profiling and plugging technology which was effected by high temperature and cost of plugging agent could not solve the problem that area edge water and bottom water invaded extensively. In this paper, water submerging rule of high water cut area of heavy oil reservoir was analyzed in a whole, thus, water invading direction and water submerging degree were determined, water plugging well was optimized. The first line water submerging well was the main object, and secondary line water submerging well was the subsidiary object, aiming at first line resisting water and secondary line producing heavy oil. As for bad water submerging wells, large dosage plugging was carried out, plugging agent injecting quantity was higher than 1000m3. As for secondary line water submerging wells, plugging agent injecting quantity was 400m3～600m3 . To fulfill large dosage but low cost injection and to meet the need of resisting high temperature and vapor, three types water plugging agents of anti-high temperature profile control agent, sodium silicate/clay gel plugging agent, and high intensity resin silty coal ash plugging agent, integrating pilot plugging agent of low and high intensity gels and anti-high temperature bull plugging agent were developed. Injecting equipment used in construction, having the merits of low shear to polymer, continuous preparing liquid and injecting ability and auto-control working parameters, was ground intelligent pump injection system developed independently. It could work at large dosage the whole day. It was applied in Lengjia oilfield Leng41 area to plug bottom water and in Leng42 area and 603 area to plug edge water, 94 wells in total. 5.6×104m3 plugging agent was injected, enhanced oil was 6.75×104t, edge water and bottom water submerging velocity was lowered, furthermore, area whole developing effectiveness was increased.