STUDY OF RECOVERY RATE OF HORIZONTAL WELLS IN SURPRESSURE, LOW-PERMEABILITY WITH BASAL WATER RESERVOIR

In order to reasonably develop the unusual low-permeability and high pressure dual-porosity reservoir of Pre-salt carbonatite in Kenkiyak oil field, In this paper takes into account the factors such as pressure sensitization and bottom aquifer drive and studies the production characteristics of horizontal well and reasonable oil recovery rates by the numerical simulation of single well with dual-porosity model. The results show that the effective factors include the formation pressure, the energy of basal water, the pressure sensitivity and etc. In the natural depletion development, small bottom aquifer can improve recovery, and more sensitivity the stress of the reservoir is and less the degree of reserve recovery will be, and there is a maximum degree of reserve recovery in various producing rates. Therefore, account for recovery ratio, formation pressure and water cut, the proper oil recovery rate of Pre-salt carbonate reservoir of Kenkiyak field is 2%-3%.