The Research Advanced Water Injection Timing And Reasonable Injection Parameters Of Chang7Reservoir In Ordos Basin

In recent years, with the depth of exploration degree, The Chang7oil reservoir group of Yanchang Formation in Ordos basin is the main oil sources of the Mesozoic reservoirs of the basin. As oil-generated reservoirs, there are many researches on the reservoirs. The new drilling indicates that there are well developed reservoirs in the Chang7oil reservoir group.They have favorable conditions to form self-generated and self-stored oil reservoirs. They show a large resource potential and development prospects and are also important succeed formation in Ordos Basin. With the oil reservoir thickness range of2.3～18.1m, the average porosity10.3%and the average permeability0.2×10-3μm2, The Chang7reservoir is the delta front sub-facies sedimentary that belongs to delta sedimentary system, is typical extra(super)-low permeability reservoir.Considering that when the fluid flow through the extra(super)-low permeable reservoir, it always has some special features, such as no-Darcy flow which has the kickoff pressure gradient and the elastic-plastic deformation in oil elay, the Chang Qing oil filed has proposed an effective water injection mode in order to improve the effect of oil reservoir development, and that is advanced water injection. This paper will take An83district’s Chang7reservoir of Ji Yuan oil filed for example to research advanced water injection timing and reasonable injection parameters,which has the important theoretical meaning and practical application value.This paper analyzes An83district’s Chang7reservoir geological characteristics of Ji Yuan oil filed, carries out reservoir evaluation and production capacity. Using three-dimensional stochastic modeling, reservoir engineering theory and numerical simulation, research advanced water injection timing and reasonable injection parameters,determine the minimum, maximum and mean of each parameter.And it has the directive meaning to enhance well production and assure the production will be the maximal in Chang7formation in Ordos Basin, and its theoretical foundation can be used for reference in our country’s congeneric reservoirs’development.