公开(公告)号：WO2006056735A1

公开(公告)日：2006-06-01

申请号：PCT/GB2005/004275

申请日：2005-11-04

Applicant: NEFF, Michael, Claude

Inventor： NEFF, Michael, Claude

IPC: E21B7/06 ,  E21B10/26

CPC classification number: E21B29/06 ,  E21B7/061

Abstract: A sidetracking system has a pair of serially connected mills (8, 9), each having a plurality of circumferentially arranged blades having a tapered cutting portion (82, 93) thereon for cutting a window in a casing and then sidetracking in a formation. A whipstock has at least three axially spaced ramps, each ramp being interspaced by a substantially axially extending portion. Each of the ramps has the same angle of inclination to a longitudinal axis and the distance between the ramps is the same as the distance between the tapered portions on the mills (8, 9) so that when, in operation, load is shared between both mills. The mills have a button (83, 93) of hardened material located on the tapered cutting portions so that the button abrades the whipstock ramps (31, 32, 33).

Abstract translation: 侧钻系统具有一对串联连接的磨机（8,9），每个铣刀具有多个周向布置的刀片，其上具有锥形切割部分（82,93），用于在壳体中切割窗口，然后在钻井中侧钻。 造斜器具有至少三个轴向隔开的斜面，每个斜面通过基本轴向延伸的部分间隔开。 每个斜坡具有与纵向轴线相同的倾斜角度，并且斜面之间的距离与铣床（8,9）上的锥形部分之间的距离相同，使得当在操作中两者之间共享负载时 工厂。 铣刀具有位于锥形切割部分上的硬化材料的按钮（83,93），使得按钮磨损造斜器斜面（31,32,33）。