Calculation methods review of controlling degree in water drive reserves and new method research

The controlling degree in water drive reserves is an important index of oilfield flooding development.Therefore,the accurate and reasonable calculation of the controlling degree in water drive reserves in different types of reservoirs can provide a good guidance for the development and adjustment of oil reservoirs.However,the calculation methods at present could not satisfy the actual requirements.On the basis of in-depth research and dissection of the previous methods,the advantages and disadvantages of various methods were summarized.Combined with the well density method and the oil sand body method,a new actual method was put forward to calculate the controlling degree in water drive reserves.Actual field application results indicated the reserves controlling degree calculated by the new method was in more accordance with the actual oil field understandings.