孤东油田小油砂体提高采收率技术

孤东油田小油砂体为曲流河沉积,具有面积小、储层物性差、分布零散等特点,开发上具有注采对应率、地层压力、储量动用程度和采收率均较低的特点.为改善开发效果,应用了相变对比模式、河道砂体追踪描述、正演模型等技术精细刻画了小油砂体储层内部结构及展布规律；利用数值模拟技术对2类小油砂体6种开采方式的不同厚度储层进行了累积产油量经济界限评价,优化其开采方式,制定了与地质特点相适应的活性水吞吐、注采井网完善和不稳定注水等开发调整技术；研究了小油砂体、小钻机、小井眼和新工艺的“三小一新”配套钻采技术.通过相应技术实施,孤东油田小油砂体储量动用率提高59.1％,采收率提高14.8％.

Improved recovery method on small oil sandbody in Gudong oilfield

The small oil sand of Gudong oilfield mostly belongs to meander fluvial sedimentation, which is limited area, poor reservoir property, dispersed distribution, low flood and development performance. Digital technique is used to optimize the development project after small oil sand reservoir is described, and at the same time, the integrated technique of drilling and production is implemented.Economic benefit is enhanced through field practice, reservoir availability and recovery ratio is respectively enhanced by 59.1% and 14.8%.