发明授权
- 专利标题： Whipstock assembly
- 专利标题（中）： 惠普组装
-
申请号： US765383申请日： 1997-04-07
-
公开(公告)号： US5884698A公开(公告)日： 1999-03-23
- 发明人: John Hughes , Michael Robert Konopczynski
- 申请人： John Hughes , Michael Robert Konopczynski
- 申请人地址： GBX CAX
- 专利权人： Shell Research Limited,Canadian Fracmaster Limited
- 当前专利权人： Shell Research Limited,Canadian Fracmaster Limited
- 当前专利权人地址： GBX CAX
- 优先权： EPX94201654 19940609; EPX95200929 19950412
- 主分类号： E21B7/06
- IPC分类号： E21B7/06 ; E21B7/08
摘要：
The whipstock assembly comprises an assembly casing (9) with preformed windows connected to production casing (7); a landing tube (21) is located within assembly casing (9) for receiving whipstock shaft; a key is located within tube (21) for cooperation with J-slot on whipstock shaft. The whipstock consists of upper (49) and lower (55) portion which are fixed against relative rotation by splines. The assembly casing (9) with landing tube (21) is positioned in the borehole using a gyro survey tool for correct orientation of the windows. After a first side hole has been drilled, upper portion (49) is raised and rotated to place wedge surface (51) for drilling a second side hole. Tube (21) is initially closed by a cap containing a marking fluid; after the cap has been drilled out the marking fluid indicates the removal of the cap. In a second embodiment two vertically spaced side holes are drilled.