华北油田油藏构造边部稠油冷采方法

Cold production method for heavy oil at the structural edge of oil reservoir for Huabei Oilfield

摘要: 部署在油藏构造边部稠油井, 当50℃下原油黏度达10 000~40 000 mPa·s甚至更大时，难以正常开采。为此对油藏构造边部稠油黏度的控制因素进行了解析，分析了结构黏度、胶质沥青质大分子、Ni、V、N等杂原子含量对稠油黏度的影响；结合影响机理研制了处理油层降黏剂，并通过径向钻井技术的应用，增大油藏构造边部稠油井泄油面积，现场采用螺杆泵配套同轴双空心抽油杆等开采措施，使15口稠油井得以正常开采，为油藏滚动扩边提供了开发资料。

Abstract: In this paper, a series of studies were carried out to guarantee the normal production of heavy oil wells (viscosity of crude oil higher than 10 000-40 000 mPa·s, 50℃) at the structural edge of oil reservoirs.First, the factors controlling the viscosity of heavy oil at the structural edge of oil reservoirs were analyzed.Then, some measures were taken.For example, radial drilling is carried out in oil layers, viscosity reducing agent is applied in oil layer, and progressive cavity pump is combined with coaxial dual-hollow rod.As a result, normal production is realized in 15 heavy oil wells.It makes a certain contribution to the natural decline of oil reservoirs and provides the reliable development data for progressive extension of oil reservoirs, as well as the reference for the production of heavy oil at the similar structural edge.