公开(公告)号：US5230386A

公开(公告)日：1993-07-27

申请号：US715417

申请日：1991-06-14

申请人： Jian-gun Wu ,  Macmillan M. Wisler

发明人： Jian-gun Wu ,  Macmillan M. Wisler

IPC分类号： E21B7/04 ,  E21B7/06 ,  E21B47/022 ,  G01V3/30

CPC分类号： E21B7/06 ,  E21B47/022 ,  E21B7/046 ,  G01V3/30

摘要： A method for detecting and sensing boundaries between strata in a formation during directional drilling so that the drilling operation can be adjusted to maintain the drillstring within a selected stratum is presented. The method comprises the initial drilling of an offset well from which resistivity of the formation with depth is determined. This resistivity information is then modeled to provide a modeled log indicative of the response of a resistivity tool within a selected stratum in a substantially horizontal direction. A directional (e.g., horizontal) well is thereafter drilled wherein resistivity is logged in real time and compared to that of the modeled horizontal resistivity to determine the location of the drill string and thereby the borehole in the substantially horizontal stratum. From this, the direction of drilling can be corrected or adjusted so that the borehole is maintained within the desired stratum.

摘要翻译： 提出了一种用于在定向钻井期间检测和感测地层中的层之间的边界的方法，以便可以调整钻孔操作以将钻柱维持在选定层内。 该方法包括初始钻孔，确定具有深度的地层电阻率的偏移井。 然后对该电阻率信息进行建模以提供指示在基本上水平方向上的选定层内的电阻率工具的响应的建模对数。 此后钻出方向（例如，水平）井，其中电阻率实时记录并与建模的水平电阻率进行比较，以确定钻柱的位置，从而确定基本水平的地层中的钻孔。 由此，可以校正或调节钻孔的方向，使得钻孔保持在期望的层内。