Reservoir Egineering Deision-making Technique Study On Water Plugging Of Highly Deviated Well

Water production in oil wells was the inevitable phenomenon in water flooding reservoirs, which effected substantially the regular development. Highly deviated wells took great proportion in the west of North Sea. The problems of reservoir heterogeneity and development schemes and improper measures caused the non-uniform water advancement, rapid rate of water-cut increase and rapid rate of production decline in oil wells, unstable commingling production and substantial water production. Highly deviated well water plugging was the effective technology of"stabilizing oil production and controlling water-cut"in the offshore oilfields and reservoir engineering decision-making technology was the key technology of highly deviated well water plugging. Aimed at the problems of the weak theory and simple method in present water plugging decision-making technology, a set of reservoir engineering decision-making technology of highly deviated well water plugging was developed with the research objects of west of North Sea Weizhou114,Weizhou121/121N,Wenchang131 and Wenchang132. Taken the consideration of geological and development effect, water production rules of different types reservoir oil wells were simulated in concept model. On the basis of the classification of water production in oil wells, the adaptability of various water plugging methods was studied. The optimization of water plugging methods was carried out with the aid of reservoir geology, technological conditions and water production rules. Performance prediction model of water plugging in oil wells was established using analytical method and numerical simulation and evaluation indexed of water plugging and corresponding evaluation method were also established. Decision-making software of highly deviated well water plugging was developed and applied in those fields. It was indicated that the study result of water production mechanism in highly deviated wells had strong practicality. The performance prediction and evaluation system of water plugging overcome the roughness of other methods and satisfied corresponding demand of accuracy and velocity. Decision-making integrated technology of water plugging could meet the need of field application and had good prospect of application.