温五区自喷流压下限地层压力保持研究

利用前苏联克雷诺夫的油气垂直管流中的上升理论公式计算了温五区块不同气油比下不同含水阶段自喷流压下限.研究表明地层压力应保持在饱和压力以上,防止由于地层压力低于饱和压力造成地层原油粘度急剧增加,防止油层中脱气形成油气水三相渗流导致油相渗透率降低、渗流阻力增大;地层压力保持越高,油相流动能力越强,采油指数值越大,采油井生产能力越强.结合渗流阻力分析所得结论、采液和采油指数变化规律、生产压差等对脱气半径的影响,以及,确定了保证温五区块不同气油比、不同含水阶段保持采油井自喷产液量达到10 m^3/d所需的地层压力,为温五区油藏的开发提供了良好的理论基础,对于油藏性质相近的油藏的开发工作也具有一定的借鉴意义.

Formation pressure at lower flowing pressure limit in Wenwu Area

The lower limit of flowing pressure at various oil-gas ratio and water-cut stage in Wenwu Area is calculated using former soviet Craynof's rising theory formula of upright flow of oil and gas.The study shows that formation pressure should keep above saturation pressure to prevent oil viscosity from increasing rapidly,degassing in reservoir and three-phase flow resulting in oil permeability decrease and higher filtrational resistance.The higher the formation pressure is,the better the oil mobility is,the larger the production index is,and the higher the oil well production capacity is.Combing with filtrational resistance,fluid and oil production index,and the influence of producing pressure differential on degassing radius,the formation pressure needed for keeping natural flow fluid production of 10 m~3/d at various oil-gas ratio and water-cut is determined for Wenwu Area.This provides good theoretical basis for reservoir development in this area and is of reference significance to the development of reservoirs with similar characteristics.