渤海油田科学探索井地层压力预测技术

Prediction technique of formation pressure for scientific exploration well in Bohai Oilfield

在油气钻探过程中,地层压力预测是一项十分关键的基础工作,特别是对于科学探索井,精确的地层压力预测能够为钻井液密度选择、钻井参数优化和井身结构设计提供科学依据。基于渤海某科学探索井的地震资料,以及周边区块已钻井的地质、地震、钻井、测井、测试等资料分析,得出了科学探索井地层孔隙压力、破裂压力、坍塌压力及漏失压力剖面,建立了合理的钻井液安全密度窗口。现场应用结果表明,该地层压力预测结果具有很高的预测精度,很好地指导了该科学探索井的钻完井施工,取得了良好的应用效果。

In the process of oil and gas drilling, formation pressure prediction is a very key basic work, especially for scientific exploration wells. The accurate prediction of formation pressure is of great importance to decide the drilling fluid density, optimize the drilling parameters, as well as design the most appropriate wellbore structure. According to the seismic data and the other data of geological exploration, well testing, well logging from the drilled wells in Bohai Oilfield, the formation information are obtained, including pore pressure, fracture pressure and collapse pressure. The safety window of reasonable drilling fluid is determined. The estimated formation pressure has been tested in real testing and it turns out with a high accuracy, which effectively guides the drilling and completion work with a good application effect