The Study On The Development Program Adjustments Of Donghe4Carboniferous Oil Reservoir In Donghetang Oil Field

The Donghe4Carboniferous oil reservoir in Donghetang oil field is an elastic reservoir in a semi-closed state, with the inactive edge and bottom water, the thin sandwich faults and heavy oil, which was located on Kuche County in Xinjiang.The4th anticline in Donghetang is the second oil anticline after the lth anticline which was found in Donghetang fault anticline belt. Its structural traps area is small and the amplitude is low, and has a superior accumulation condition. The properties of this reservoir is medium-low porosity and medium-low permeability, there are some obvious differences in the longitudinal direction. Since1992, along with the implementation of development programs, reservoir gradually exposed some problems that vertical and horizontal conflicts have become increasingly prominent, long-term stable situation is grim, and the remaining oil distribution complex, water sports understanding of the law difficult. Until March2012, the cumulative oil production reservoir42.1439×104t, production degree15.96%, moisture content of6.11%. In order to solve these problems that the development effect is far from perfect, the well network is imperfect, the utilization of reserves is relatively small, and the case of injection and the corresponding can not meet the requirement of the remaining, we can make some reasonable development programs on the basic of geological model and numerical simulation researches, which is of great significance for the stable yield of the Donghe4Carboniferous oil reservoir. From the actual situation of the reservoir, combined with previous geological knowledge, made full use of drilling,coring, logging and production dynamics, We can carry out the research on the reservoirs’geological characteristics and the geological modeling.Through the establishment of the East River4CIII reservoir visualization reservoir level model, construct models and reservoir properties model,we can quantitatively characterize the distribution of subsurface reservoir characteristics and the distribution characteristics of interlayers, Through using Eclipse the authors analyzed the distribution of remaining oil and causes that the main reason is due to the presence of certain internal distribution of reservoir permeability streak instability, as well as oil-water interface exists near the relatively large viscosity heavy oil segment, resulting in oil possession of restricted bottom water rise, resulting in the reservoir at the top of the larger remaining oil reservesBased on the analysis results of the testing and reservoir engineering studies, combined with the fact that it is lack of natural energy,we think it is necessary to inject water to supplement the formation energy, so that,we can maintain the oil field’s longer-term production. By calculating we chose the best parameters for the injection and pressure systems, such as reasonable bottom hole flowing pressure, injection well ratio, injector spacing, as well as single well injection volume.By comparing three development programs we finally put forward, we conclude the third option is optimal. Predicted for2034, the third option will significantly improve the reservoir’s recovery to36.69%, which increased by15.84%.