公开(公告)号：EP3390758A1

公开(公告)日：2018-10-24

申请号：EP15910875.2

申请日：2015-12-14

申请人： Halliburton Energy Services, Inc.

发明人： SAMUEL, Robello ,  ZHANG, Yuan

IPC分类号： E21B7/04 ,  E21B7/06 ,  E21B17/00 ,  E21B47/02

CPC分类号： E21B7/06 ,  E21B7/04 ,  E21B7/062 ,  E21B47/0002 ,  E21B47/0006 ,  E21B47/12

摘要： An illustrative dogleg severity (DLS) estimation method includes: retrieving dimensions of steering assembly; determining an initial DLS estimate; using the DLS estimate in combination with the steering assembly dimensions to determine node displacements for a shaft portion of the steering assembly; deriving a bit side force from the node displacements while accounting for elastic bending in a housing portion of the steering assembly; performing a DLS calculation based in part on the bit side force; adjusting the DLS estimate if the DLS calculation does not match; repeating said using, deriving, performing, and adjusting until a match is achieved; and storing the DLS estimate on a nontransient information storage medium.