Wells – Wells with lateral conduits
Patent
1994-06-27
1995-07-11
Schoeppel, Roger J.
Wells
Wells with lateral conduits
1661175, E03B 311
Patent
active
054312191
ABSTRACT:
Methods and systems for forming a window through the wall of a well casing to enable a new borehole to be drilled outside the casing include forming a cement plug in the casing, drilling a laterally offset hole in the cement plug, orienting and setting a whipstock in the offset hole, and using the whipstock to drill an elongated window through the casing wall opposite its deflector surface. The drilling steps employ a mud motor having a bent housing that establishes a toolface for the bit, and proper orientation is obtained by downhole measurement and transmission to the surface of orientation signals and downhole adjustment of orientation to a selected toolface value. The whipstock is oriented in the same manner. All drilling and orientation procedures are carried out on coiled tubing to reduce costs.
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Doremus Denis
Leising Larry J.
Shaheen Mansour S.
Bouchard John H.
Dowell, a division of Schlumberger Technology Corp.
Garrana Henry N.
Schoeppel Roger J.
Vick, Jr. John E.
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