Wells – Valves – closures or changeable restrictors
Patent
1977-01-24
1978-06-06
Leppink, James A.
Wells
Valves, closures or changeable restrictors
166208, E21B 2300, E21B 4310
Patent
active
040930300
ABSTRACT:
The described invention includes method and apparatus for the installation of a casing hanger supporting a string of casing down hole in an oil or gas well, for removal of the installation equipment, and for tying back the hanger to an insulated production riser extending to the surface. The casing hanger is lowered into the well on drilling casing, having a smaller outside diameter than the insulated production riser casing, to permit a sufficiently large annulus for the passage of fluid between the drilling riser and the previously installed drilling riser. The drilling riser is removed by disconnecting it from the hanger by clockwise rotation of the drilling riser. The insulated production riser casing, or other special riser pipe, having a larger outside diameter than the drilling riser casing, is used to tie back with the hanger where standard riser casing is not suitable for the production of oil or gas, e.g. in the case of production through permafrost, by a clockwise rotation of the drilling riser. Clockwise rotation is used both to disconnect the drilling riser and to connect the production riser. To perform these operations three preferred embodiments of the invention are described: one having two threaded connections, a second having a threaded connection and a latching mechanism, and a third having a latching mechanism for both operations. All threaded connections and latching mechanisms include an axially sliding nut.
REFERENCES:
patent: 3404736 (1968-10-01), Nelson et al.
patent: 3457992 (1969-07-01), Brown
patent: 3461958 (1969-08-01), Brown
patent: 3540533 (1970-11-01), Morrill
OBS-C Wellhead System, Oil Center Tool, pp. 3540, 3541. Publication cited by applicant, assumed prior art, Jan. 24, 1977.
Conley Ned L.
Leppink James A.
McEvoy Oilfield Equipment Company
Ostfeld David M.
Robinson Murray
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