Research On The CO₂-Water Slug Drive Development Of Qi2-8-10 Oil Pool

The petroleum geological reserves of hyposmosis oil pool in Liaohe oilfield is 1.54×108t,but the degree of development is only 9.8%.Dujiatai oil reservoirs of Huanbei area is the typical representation of hyposmosis reservoir in Liaohe oilfield,the reservoir property is poor,the average porosity is 12.2%,the permeability is 62.1×10-3μm2,the oil-bearing area is37.2km2,the geological reserves is 2409×104t,the vertical heterogeneity and areal heterogeneity is strong,the range of Interlayer permeability can reach 634 times.Since 2008,the development effect in this area is better by dealing with water qualit,optimizing flooding well network and parameters and realizing fine water injection development in this block.Along with the extension of water injection development time,the problem of waterflood pressure rise fast and oil well water channeling is growing prominence,the research on non-hydrocarbon water flooding technology is urgently needed,so proceed this project.This paper research on the phase behavior simulation of crude oil in Dujiatai oil reservoirs,and calculate the minimum miscibility pressure of CO₂ flooding in Dujiatai oil reservoirs.It confirms that CO₂ flooding can forming miscible-phase displacement of Dujiatai oil reservoirs.Through the experimentation of core displacement Indoor of Dujiatai oil reservoirs,confirm the feasible value of Injected PV and oil displacement efficiency.It design the pilot projec of CO₂-water slug drive and forecast the indicators,and confirm the best development effect of alternating water injection,and optimizat the parameters of gas injection rate,gas-water ratio and alternate cycle of water etc.The research results can improve reservoir development level of Qi2-8-10 block and instruct the development adjustment of similar oil pool.