直罗油田水平井地质导向技术研究及应用

Research on Horizontal Geosteering and Its Application in Zhiluo Oilfield

直罗油田水平井水平段钻进过程中地质导向存在沉积微相不明、鼻状隆起发育、油层预测难度大等地质风险。针对以上技术难点,结合直罗油田的地质认识和开发数据,形成了配套的水平井地质导向技术。通过邻井资料分析对比,对水平段延伸方向储层构造和砂体连通性进行大局控制;通过随钻伽马与录井岩屑,对储层微构造及连通性进行实时精细对比;通过大局控制,局部精细对比,提前预测储层,及时调整井眼轨迹,提高油层钻遇率。上述地质导向技术应用于现场68口水平井钻井过程中,取得了平均油层钻遇率91.5%的开发效果。

In Zhiluo oilfield,Drilling of horizontal well is accompanied by some geological risks which contains unclear sedimentary microfacies,development of nasal uplift forecast of oil layer with big error,etc.Aimed at these technical difflculties,a supporting horizontal geosteering technology has been put forward based on geological knowledge and developing data.Through the analysis and comparison of the adjacent wells,the reservoir structure and the sand body are controlled in the horizontal direction ;reservoir microstructure and connectivity are compared by drilling gamma-ray and mud logging; Through the overall controlling,local fine comparison,predicting the reservoir in advance and timely adjustment of the well trajectory,Drilling rate of oil layer will be improved.The above-mentioned geological guidance technology is applied the drilling process of 68 horizontal wells in the fleld,and the average oilfleld drilling rate was 91.5%.