地层自然造斜规律的利用

通过川西南地区实钻电测井斜与地震资料的统计和对比,本文较深入地研究了川西南地层的自然造斜规律,并从地层学和力学的角度讨论了地层自然造斜的作用机理,提出了常规钻井条件下定量预测井斜的方法及简便计算公式。研究认为,在倾斜地层中钻探,通过定量预测井斜值,将传统的按直眼布井改为沿地层自然造斜的相反方向移动适当距离来确定井位,从而靠地层自然造斜规律定向中靶是完全可行的,通过川西南1口井的实钻试验,获得满意的中靶效果和良好的经济效益。

APPLICATION OF FORMATION NATURAL BUILD-LAW

From the statistic and comparison of electric logging inclination in the actual wells drilled and the seimic data in the south west area of Sichuan,the formation natural building law in this area is thoroughly studied,and from the view point of stratigraphic and mechanics,the action and mechanism of the formation natural building is discussed,and the method for predicting well deviation and easy calculating equation are proposed.The studies consider that the drilling in the inclined formation,through the quantitative prediction of deviation value,it is quite possible to orientate the well bore toward the target relying on the formation natural building law by changing the determination of well location according to the traditional location of verical well into moving the well to an appropriate distance along the opposite direction of formation natural building.From the drilling practices of 4 wells in south west area of Sichuan,the target is satisfactorily reached and good economic effect is obtained.