The Potential Of Remaining Oil Potential Tapping In Shuanghe Oilfield 437â…¡4-6

Shuanghe Oilfield 437Ⅱ4-6 is a Semi-closed reservoir,the reservoir located in the southern of the fault number①②between the number and. The reservoir is an active edge water, in the east-west direction. Since March 1977 has been put into development, oilfield have experienced natural energy stage,infilling stage,the second encryption stage and the well flooding pattern adjustment. Currently reservoir level of recovery is 45.82%, water Percentage is 97.8%. In 17 oil wells,a well has been shut because of high moisture content, early as well as some well Transfer layer mining due to the high moisture content, 11 production wells of moisture content is greater than 95%,full production well into the development phase of high water. Oil production decline has accelerated, poor single well oil production, water use efficiency is low.In high water cut stage,the reservoir characteristics are high water cut, high degree of recovery, remaining recoverable reserves of less,and effects of poor water flooding. Based on previous studies, by methods of reservoir engineering and reservoir simulation studies, the article made some important results and understanding.First of all, by the reservoir layers of sand body distribution and permeability differences, using Lorentz curve evaluated reservoir heterogeneity. The results showed that the macroscopic heterogeneity of the reservoir is moderate, in layers and interlayer is serious.Secondly, using reservoir production performance data, by the index of water flooding effect evaluation, comprehensively evaluated effect of reservoir water flooding. The article think that reservoir early development is better, currently reservoir into the high water cut stage, obvious effect of water flooding is worse.Using binary regression analysised reservoir development law of the late production decline, come to the decreasing type is hyperbolic decline. The decline index is 3.88. Through water flooding characteristic curve and production decline analysis calculated recoverable reserves and recovery reservoir. This article think water displacement curve method calculating results are accurate and reliable. Calculated recoverable reserves are 707,460 tons, the ultimate recovery is 46.67%.The article established Shuanghe oilfield 437Ⅱ4-6 of 3 d geological model and reservoir numerical model,history matching original reservoir geological reserves,average reservoir pressure,daily oil output and water percentage, The results is satisfactory, overall fitting error is less than 6%, single well fitting coincidence rate is about 82%,show that the reservoir numerical model can reflect the actual reservoir conditions, the residual oil distribution and reliable simulation can be used as the basic model prediction. Applying reservoir numerical simulation method and Reservoir performance analysis, The article studied Shuanghe oilfield 437Ⅱ4-6 of residual oil distribution law. The results showed that reservoir emerged large area flooding, distribution of remaining oil was scattered flakes,the remaining oil is concentrated in a small fault near,Well sparse area in northwest and No production wells of area in eastern.Ⅱ4~0,Ⅱ4~1,Ⅱ4~2andⅡ4~3four small layer contains the majority of remaining oil reserves. Analysis of the impact of the major factors remaining oil distribution, They are microfacies, reservoir heterogeneity, reservoir construction and injection well network integrityFinally, according to the distribution of remaining oil and factors remaining oil,the article proposed four kinds of development programs to tapping potential of remaining oil. Through reservoir simulation prediction and comparison of predicted results, obtained four kinds of programs to fourth program was the best, Forecast until January 2016, the fourth program than the first option the cumulative oil production is over 4.76×10~4m~3, the degree of recovery is more 2.73%.