Numerical Simulation Of HDNS Technology For Shallow Heavy-oil Reservoir

Fluids are immobile in reservoir due to its high viscosity, shallow burial depth, lowformation temperature and insufficient natural energy in shallow thin heavy oil reservoir.Development is very difficult, therefore need some new improved recovery efficiencytechniques. HDNS technology uses nitrogen and dissolver assisted cyclic steam stimulationfor horizontal wells, the technology for the shallow thin heavy oil reservoir development has agood effect.Through literature research and experimental data analysis summarized the mechanismof HDNS, And by using reservoir numerical simulation method to characterization of HDNSmechanism, then the numerical model was established, through history matching modelaccords with the field data, studied on numerical simulation using the model. For HDNSassisted steam stimulation, respectively for the single factor analysis and multi-factorsensitivity analysis, the optimization of injection-production parameters; Nitrogen anddissolver effect in the development of such reservoirs was analyzed.Using numerical simulation method, the parameters in the process of HDNS assistedsteam flooding was studied. Respectively analysed of the nitrogen, dissolver auxiliary steamdrive different ways of development influence on reservoir development effect, got the bestway of develop and conducted injection-production parameters optimization; by usingorthogonal design and variance analysis method, the sensitivity of HDNS assisted steam drivewas analysed, found out the sensitive factors. Numerical simulation method was used to studythe the effects of geological factors on the HDNS technology development. The last P601sand in shengli oilfield as an example, the numerical simulation and history matching ofHDNS technology were researched and forecasted the production index, simulation resultswere basically in conformity with the actual data, fitting degree was higher.