Boring or penetrating the earth – Processes – Boring curved or redirected bores
Patent
1992-12-08
1994-03-29
Britts, Ramon S.
Boring or penetrating the earth
Processes
Boring curved or redirected bores
175 77, 175 80, 175 81, E21B 708
Patent
active
052976386
ABSTRACT:
Offshore well slots are recovered by cutting off old drive or surface pipe below the mud line to form a stub end. A new drivepipe is installed with a guide and shield device disposed on the scarfed lower end or "mule shoe" of the new drivepipe. The guide and shield device includes a saddle contiguous with the lower end of the new drivepipe having one or more hooks formed on the outer surface thereof for engagement with the stub end to locate the device and the new drivepipe. Shear pins interconnect the new drivepipe with the device and are sheared in response to downward driving action on the new drivepipe or allowing the full weight of the drivepipe to be exerted on the shield device after engagement with the old drivepipe.
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patent: 5115072 (1992-05-01), Burnet et al.
Atlantic Richfield Company
Britts Ramon S.
Martin Michael E.
Tsay Frank S.
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