Study On Water Control Technology For Developing Strong Bottom Water Reservoir In Horizontal Wells

Reservoirs with bottom aquifer are widely spread at home and abroad, bottom aquifer which supplies sufficient energy,combines with the density difference of water and oil,creating a convenient condition for bottom water cresting.The horizontal well is popularized and become a major technique for bottom aquifer reservoir exploitation because it has such advantages as large producing area,the drawdown pressure required to produce is small,and will have a high production in low drawdown pressure. But the problem induced by this manner exposed day by day,and are mainly embodied in short production stability,rapid declining of oil production,water cut of the wells increasing rapidly,and difficulties in finding water and controlling of it. So,it has great significance for the implementation of mading horizontal well produce quickly and lower the water cut.In this paper,the bottom aquifer reservoir water controlling implementations are analyzed and contrasted based on the detailed investigation of the related literatures,and combined with the actual situation of oil field,the idea of DWS horizontal well technique is presented. Firstly,the conception of DWS horizontal well technique is introduced,and the theoretical numerical model is created basing on the early process model,then the mechanism is studied and feasibility analysis is carried out,the model parameters are simplified and the seepage mathematical model is derived basing on the seepage mechanism of DWS horizontal well technique. And then,the breakthrough time,the shape of water coning and the product dynamic are calculated. Furthermore,basing on the factors that are ignored in model simplified,the impact of capillary pressure change and relative permeability backward on bottom water coning are analyzed.It need to consider the factors that affect the exploitation effect in application,in this article,various parameters are optimized,such as water coning locations,drainage and production ratio,and so on. The two kind of DWS horizontal well technique(TWS and BWS) is compared and analyzed,and combined with deep-penetrating skills,the TWS technique is improved. The example is given as follows,Tahe oil field is a typical strong bottom aquifer reservoir,the DWS horizontal well technique numerical simulation is carried out,the results reflect that this technique can decrease the water cut and improve reservoir recovery effectively,it proved adequately that the DWS horizontal well technique is feasibility and operability.