Wells – Processes – Placing or shifting well part
Patent
1996-07-17
1998-06-23
Schoeppel, Roger J.
Wells
Processes
Placing or shifting well part
1661176, E21B 2300
Patent
active
057691673
ABSTRACT:
A thru tubing whipstock assembly 10 may be set within a casing string CS after passing through the lower end of a smaller diameter tubing string TS. Once set within the casing string CS, the whipstock face 18 on whipstock body 12 may divert a rotatable bit B for cutting a window in the casing string CS. The whipstock assembly 10 includes an anchor A below the whipstock body 12 for securing the set whipstock assembly within the casing string. A hinge assembly 14 below the whipstock body 12 may be pivoted from a run-in position for passing through the tubing string to a set position for positioning the whipstock face 18 for engagement with the bit B. A wedge assembly 38 is provided at the upper end of whipstock body 12 and is also movable from a run-in position to a set position. The wedge assembly includes an outer wedge member 102 for engaging an interior wall of the casing string at a position circumferentially opposite the location where the window is to be cut, and an inner wedge member 104 slidably moveable with respect to both the outer wedge member 102 and the whipstock body 12. An elongate rod 52 is positioned within a bore 54 extending through the outer wedge member, the inner wedge member, and an upper portion of the whipstock body 12 when in the run-in position. The rod 52 retains the wedge assembly in the run-in position, and is removed to allow the outer wedge member 102 and inner wedge member 104 to move to the set position. A rod extension 92 extends through a passageway 94 in the whipstock body 12 so that a lower end of the rod extension 92 fits within a socket 160 within a hinge arm 166 to retain the hinge assembly in the run-in position. Once the rod 52 is moved upward, the biasing force of a spring 150 moves the rod extension 92 out of the socket 160, thereby allowing the hinge assembly to pivot to its set position. The whipstock assembly is also retrievable through the tubing string.
REFERENCES:
patent: 4153109 (1979-05-01), Szescila
patent: 4509060 (1985-04-01), Carter
patent: 5425419 (1995-06-01), Sieber
patent: 5551509 (1996-09-01), Braddick
U.S. application No. 08/409,276 filed Mar. 23, 1995.
PCT Publication No. WO 95/07404, published 16 Mar. 1995.
Copy of Great Britain Search Report for Appln. No. GB 9714517.1 dated Oct. 7, 1997.
Schoeppel Roger J.
TIW Corporation
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