扶余油层致密油水平井优化设计及随钻调整技术

Optimized Design of Tight Oil Reservoir Horizontal Well in Fuyu Reservoir and Technology of Adjustment While Drilling

大庆长垣扶余油层致密油资源潜力大,以常规方式难以开发动用,近3年在扶余油层采用长井段水平井钻探以提高单井产能,而扶余油层储层主要以河流相沉积为主,砂体薄,连续性差,河道摆动快,水平井砂岩钻遇率低,为此开展了长井段水平井部署设计和精细地质导向研究。形成了扶余油层"三优两精"水平井部署设计及随钻跟踪调整技术,即优选靶区、优选靶层、优选靶向的"三优"水平井设计方法,精细分析准确入靶、精细跟踪防止脱靶的"两精"随钻地质导向调整技术。实践证明该方法大幅提高了水平井砂岩钻遇率,确保水平井在扶余油层致密油储层勘探中取得产能突破,致密油储层单井日产量大幅度提高,约为邻近直井20倍,为致密油储量有效动用提供了借鉴。

The resource potential of tight oil was high in Fuyu Reservoir in the placanticline structure of Daqing Oilfield,which was difficult to be developed by using conventional method.For recent 3years,Fuyu Reservoir has been drilled by using long horizontal well with high volume of bulk fracturing.It was mainly consisted of fluvial deposits with thin sand bodies,poor continuity and fast channel changes,there existed high risk and large investment in planning and implementing the long horizontal wells,but it was high efficient.In order to avoid the risk in the design and implementation of the long horizontal wells,the technique of'three optimizations and two superior analyses'is established in planning,tracing and adjusting while drilling,which effectively directs the exploration practice of horizontal wells.The horizontal well drilling achieves the production breakthrough in tight reservoir exploration,it greatly improves the individual well production,it is approximately 20 times as much as the adjacent vertical wells.