Method of and apparatus for cutting and recovering of submarine surface casing
Patent 3983936 Issued on October 5, 1976. Estimated Expiration Date: 
October 5, 1993. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
October 5, 1993. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 1830207 2261564 2640537 3301324 3338305 3376927 3378072 InventorsAssigneeApplicationNo. 05/583053 filed on 06/02/1975US Classes:166/361, Pipe cutting means166/365, With provision for disassembly166/55.8, Tool moved radially by fluid pressure166/98GRAPPLE AND WELL ANCHORED LIFTING MEANSExaminersPrimary: Purser, Ernest R.Assistant: Favreau, Richard E. Attorney, Agent or FirmInternational ClassesE21B 29/00 (20060101)E21B 31/00 (20060101) E21B 31/16 (20060101) E21B 29/12 (20060101) AbstractThe method of and apparatus for cutting and recovering submarine surface casing and associated equipment on the ocean floor included the steps of lowering a string into the surface casing which string includes a swivel, a spear and a cutter, seating the swivel on the casing well head seat, actuating the cutter to sever the casing, setting the spear within the casing and recovering the surface casing and well head equipment associated therewith.Field of SearchIndicatingMEANS FOR PERFORATING, WEAKENING, BENDING OR SEPARATING PIPE AT AN UNPREPARED POINT Internal Tool moved radially by fluid pressure GRAPPLE AND WELL ANCHORED LIFTING MEANS Perforating, weakening, bending or separating pipe at an unprepared point Perforating, weakening or separating by mechanical means or abrasive fluid | |
