Eaton法预测M油田地层孔隙压力

Application of Eaton Method in Predicting the Formation Pore Pressure of M Oilfield

准确的地层孔隙压力数据,是合理设计钻井液密度和井身结构的基本依据,也是油气层保护、提高钻井成功率、降低钻井成本的前提。M油田位于渤海辽东湾北部海域,渤海辽东湾海域下第三系储层中存在异常压力,纵向上孔隙压力剖面预测困难,严重影响了该区的钻井工程优化设计。运用Eaton法进行了该区地层孔隙压力的预测,并建立了纵向地层的孔隙压力剖面图。实测数据和预测数据对比结果表明,预测结果精度较高,能有效地指导现场钻井施工。

Accurate formation pore pressure was the fundamental basis of reasonable design of drilling fluid density and the wellbore structure,and was the premise of formation protection,improving drilling success rate and reducing the cost of drilling.M Oilfield was located in the northern sea area of Liaodong Bay,where abnormal pressure existed in the Tertiary reservoirs.Vertical pore pressure profile was difficult for prediction,which would seriously affect the design of drilling engineering optimization.In this paper,the formation pore pressure of M Oilfield is predicted by using Eaton method,and the vertical pore pressure profile is developed.The actual data are compared with the forecasted ones,the result shows that predicted results is high accuracy and it can be used for guiding the drilling operation in oilfields.