The Effect Of Water Injection Development Of Southwest In Bao 1 Oil Field

In this paper, as to some prominent and severe problems of Liaohe oil field, such as reservoir heterogeneity is strong, absorbent is disproportion vertically of injection wells, and in the long run the water flooding development process, the underground water is in low, ineffective water injection increase, effects of various measures annual variation,on the base of the comprehensive analysis of production history for the southwest in Bao 1 oil field. By summing up the empirical formula and theoretical formulas about water flooding, water content, increase rate of water content, the maintain level of the pressure, the adaptability index of well developed network adaptability index of all oil fields. The results showed that this field had a long time to switch water, Water-control measures were not kept up with in time,so the effect of Water flooding was poor from March 1995 to April 2009. However, after the water injection, the level of pressure has maintained well; Predict the largest cumulative oil production of the block is 109.50×10~4t, the ultimate oil recovery is 14.20%.The currently injection-production well is not suitable for exploitation of network situation, it is need to change development mode for production.Taking use of numerical simulation techniques, we built a geological model according to the actual reservoir by petrel software ,and studied the remaining oil distribution of this blocks by eclipse software. The history matching resulted that: the calculation of geological reserves is 775.4×10~4t, the actual geological reserves is 771.25×10~4t, the relative error is 0.54%,calculation of cumulative oil production is 81.13×10~4t, the actual data is 80.03×10~4t, the relative error is only1.38%, a simulation of comprehensive moisture is 59.20%, the actual moisture content is 59.90%, relative error was 1%.The depth of current oil-water interface is -1055m,it increased by about 35m comparing with -1009m in the early days.It flooded serious in the well-intensive areas and the low parts of reservoir,and basically did not flood in the well sparse area and high position of reservoir,not flooded layer mainly distributed in S1 ~ S21,the reserves which are not flooded is 306.04×10~4t which took up 45% of the remaining reserves, the reserves which are weak flooded is 130.2×10~4t which took up 19.31% of the remaining reserves.According to residual oil saturation distribution law,we study a multi-program comparative conductes,in the conditions of changing the production horizon,and the relationship between injection and production, The results show that:at the end of April in 2009,at the priemise of saving energy,we open the original note and production well,transfer high injection wells and use encryption method between wells at the larger and residual oil from the region. We perfect six encryption wells,they are 32-J1,32-J2,36-J3,31-J4,30-J5,32-J6.We use the internal block cutting water at the southwest in Bao 1 oil field,get the maximum economic benefits until the end of the forecast period,the calculation of cumulative oil production is 125.70×10~4t,the phase degree of recovery is 16.30%,the lowest water content is 90.09%.