水平井分级逐层精准地质定向技术在薄层中的应用

Application of Horizontal Well Layer-by-Layer Geological Direction Technology in Thin Layers

水平井已成为当前条件下高效开发油田的重要手段,但薄储层和薄隔层油藏实施水平井地质导向中的探层井斜控制和油层穿遇精度相当困难,存在井眼轨迹调整余地小、探层井斜控制难、油层穿遇精度高等难点,通过优化钻井设计,建立多级标志层,并进行分段造斜率优选,精细预测地层倾角等形成水平井分级逐层精准地质定向技术,能实现薄油层高精度轨迹控制的目的。该技术在广华油田应用,优化了井眼轨迹在油层中的位置,明显提高了水平段有效砂岩钻遇率,最大限度地实现了水平井钻井目的,取得良好的开发效果。

Although horizontal wells become an important tool in high-efficient oilfield development,it is rather difficult to control the well deviation in probed layer and pass through oil layer accurately while using horizontal well geological direction technology in thin-bed and thin-interlayer reservoir.Through improving drilling design,building multistage marker beds,selecting rate of deviation change in sections and precisely predicting dip angle,established is horizontal well layer-by-layer geological direction technology which can control accurately well trajectory in thin oil layer.Its application in Guanghua Oilfield has improved the location of well trajectory in oil layer,increased effective sandstone drilling ratio in horizontal section and reached the target of controlled directional well drilling to the greatest degree.