Water Injection Scheme Research Of Chang2Reservoir At Wayaobao Zhongshanchuan

Chang2oil-bearing formation in Zhongshanchuan block is a priority oil production layerin Wayaobao oil production plant*its oil reserves estimates about10million tons, chang2reservoirs with shallow depth of this block, low and ultra-low permeability characteirstics. Bydeveloping scientiifc and rational injection oil layer program will significantly improve theultimate oil recovery, and laid the foundation for the efficient development of oil fields.Chang2has a special ultra-low permeability? development dififculties, and highinvestment and so on. This paper is based on expeirment, test oil and trial exploiting data,logging data and other production performance，It is mainly carried out research in four areas,geologic features such as blocks，reservoir engineering research and demonstration programsand injection development and deployment, and monitoring systems.Studies suggest that:(]) chang2reservoir is mainly meandering river phase，with goodblocking and capping conditions, lithology is mainly a light gray, gray-green massivefine-grained sandstone, pore types are mainly intergraiiular pores and dissolved pores, oil layerfor the special low permeability reservoir，is a low-density, low viscosity，low freezing point,conventional terrestrial micro-sulfur crude oil，by obtaining the average of three kinds ofrecovery experience available to more accurate formula for recovery;(2) fluctuations ininjection, it is not stable, in good condition absorbent injection wells, oil production wasrelatively effective, more obvious characteristics of water lfooding, Zhongshanqu oilzonmulti-system development is carried out in a natural side effect of bottom water;(3)Taking into account the structure and distirbution of reservoir distribution and water reservoir,the main use of anti-anti-nine and ifve-point method of injection wells arranged location,according to the analysis of relative permeability curves and flow through verticalheterogeneity and correction ratio and other factors, the ultimate recovery can be calculated, inthe mountains chang2reservoir is a closed elastic with low saturation effects of waterintrusion reservoir. Therefore, the available elastic material balance equation formationpressure after injection;(4) Wayaobao oil poduction plant more emphasis on monitoring data. it did a lot of work, but there are still some problems, individual monitoring project is still theweak link, make the necessary complement and norms.