Wells – Valves – closures or changeable restrictors – Longitudinally movable operator
Patent
1991-04-26
1992-09-08
Dang, Hoang C.
Wells
Valves, closures or changeable restrictors
Longitudinally movable operator
137527, 166242, 166323, 166332, 175318, 251303, E21B 3414, E21B 3412
Patent
active
051450054
ABSTRACT:
A casing shut-in valve system (74) having a flapper valve assembly (34) and a shift head assembly (76); the flapper valve assembly (34) having an upper body member (36), lower body member (38), flow sleeve (40), valve seat sleeve member (42), flapper (54), flapper hinge assembly (56), and a plurality of spring strut assemblies (58) disposed on opposite sides of the flapper hinge assembly; the shift head assembly (76) having key housing (134) with bit sub (144) rotatably mounted in bearing (152), a plurality of outwardly biased shift keys (80), and a load equalizer plate (138) at each end of the key housing; the shift head assembly (76) being adapted to selectively open or close the valve by engaging and moving the flow sleeve (40) between defined upper and lower positions, thereby controlling the movement of flapper (54) through an angle (128) of rotation that is less than 90 degrees, and preferably about 45 degrees.
REFERENCES:
patent: 1710410 (1929-04-01), Defenbaugh
patent: 1871536 (1932-08-01), Le Bus
patent: 2162578 (1939-06-01), Hacker
patent: 2202192 (1940-05-01), Cypher
patent: 2354310 (1944-07-01), Goodwin
patent: 2447842 (1948-08-01), Cameron et al.
patent: 3071193 (1963-01-01), Raulins
patent: 3414060 (1968-12-01), Zak
patent: 3672630 (1972-06-01), Naumburg et al.
patent: 4531587 (1985-07-01), Fineberg
patent: 4706933 (1987-11-01), Sukup et al.
patent: 4926945 (1990-05-01), Pringle et al.
patent: 4928772 (1990-05-01), Hopmann
patent: 4977957 (1990-12-01), Pringle
patent: 5044396 (1991-09-01), Daudet et al.
"A New Technique for Servicing Horizontal Wells", Tailby et al., SPE 22823, Oct. 1991.
"New Life From Old Oil Wells" appeared in Mechanical Engineering, Feb. 1991, pp. 37-41.
Dang Hoang C.
Otis Engineering Corporation
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