Increasing Oil Recovery Efficiency In SSX Reservoir Simulation Prediction

With the energy problem becoming more and more serious in twenty-first Century,how to reduce the cost and improve the oil recovery efficiency has become the focus of petroleum workers.Gas injection has become one of the most important methods to improve oil recovery.It has been popularized and widely used in domestic and foreign oil fields.It has contributed greatly to the increase of oil field.The newly discovered oil fields in China are mainly low permeability reservoirs.It has been proved that gas injection technology has been successfully applied in various low permeability reservoirs,and has achieved good results.With the development of gas injection recovery mechanism,the selection of injection gas is increasing.This paper is supported by the project of "Research on EOR technology in Shanshan oilfield." According to the actual situation of SSX oil reservoir,as the choice of displacement of the hydrocarbon gas injection EOR effect.Oil and gas reservoir numerical simulation technology is an important method to improve oil recovery.Reservoir geological modeling is the base of reservoir numerical simulation.With the continuous development of the technology,requirements of geological modeling and numerical simulation of integrated development,through the establishment of the reservoir database,modeling and model specification in the process of using the standard data,so that the process of integration of research to improve the recovery rate of the reservoir,improve work efficiency.On the basis of the actual geological conditions of the reservoir,we use petrel software to carry out the three-dimensional geological modeling of the reservoir,accounting for the actual geological reserves of 1525.4*104t.The distribution of each small layer was analyzed,and the abundance of the S2 small layer was the largest.On the basis of the geological model of the reservoir,the component model of Eclipse is selected,and the numerical simulation is carried out.The fitting of PVT,the fitting of thin tube experiment,the fitting of long core displacement experiment and the history fitting are studied.The range of gas injection is chosen,the original crude oil geological reserves are 398.56*104t.The results of gas injection engineering parameter optimization is as follows:?recommended to choose the upper layer(S1+S2)continuous hydrocarbon gas injection;?the suggestions on the choice of the average single well gas injection rate is 2*104m3/d continuous gas injection;?proposal selection of formation pressure level to maintain continuous gas injection at about 24 MPa;?the proposed control gas channeling gas oil ratio should be 3500m3/m3;?the recommended alternate cycle length for 6 months:6 months/gas alternating water injection;?the recommended slug number was 12 for hydrocarbon/water alternating gas injection method;?the recommended slug size ratio of 1:1 hydrocarbon/water alternating injection.