E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
166/49
E21B 43/10 (2006.01) E21B 23/02 (2006.01)
Patent
CA 1117412
WELL CASING HANGER ASSEMBLY Abstract A well casing hanger assembly for releasably connect- ing first and second well casings to and from each other in a well by longitudinal movement of the first member. The first member includes an annular recess in its peripheral surface and a stop shoulder is positioned at each end of the recess and a resiliently expandable and contractible locking ring is positioned in the recess for engagement with a locking notch on the second member. A protrusion is positioned in the recess and initially coacts with an opening in the locking ring. An improved re- leasable holding means is provided for initially preventing the locking ring from moving axially on the first member until the locking ring expands and engages the second member. The releasable holding means includes first and second tapered surfaces on the first member for engaging and restraining downward movement of the first member relative to the locking ring until the locking ring expands into the locking notch and thereafter act to posi- tively force the locking ring into the set position. The locking ring may include coacting tapered surfaces for coacting with the first and second tapered surfaces and may include a C- shaped release ring positioned in the opening which includes a tapered surface coacting with the second tapered surface.
336467
Borden Ladner Gervais Llp
Nelson Norman A.
Putch Samuel W.
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