Wells – Processes – Placing or shifting well part
Patent
1989-11-28
1990-11-06
Neuder, William P.
Wells
Processes
Placing or shifting well part
166323, 251 58, 251 83, E21B 3406
Patent
active
049678450
ABSTRACT:
A lock open mechanism for downhole safety valve of the type having a valve head movable downwardly from a closed to an open position relative to the bore of a well conduit. The housing of the safety valve is provided with a first downwardly facing locking shoulder above the valve head. The upper portion of the safety valve housing is provided with a no-go shoulder and above that a second downwardly facing latching shoulder. A mandrel has a tubular locking body shearably secured to its lower end which locking body is abutable with the valve head. The valve head is displaced downwardly by incremental jar produced downward movements of the mandrel until a locking collet carried on the locking body engages the first downwardly facing locking shoulder. The second downwardly facing latching shoulder absorbs upward forces exerted on the mandrel and the locking assemblage through engagement by a latching collet mounted on an intermediate housing which is carried into the well by a shearable connection which is released when the mandrel reaches its run-in position. After the locking collet is engaged, the latching collet heads are freed for disengagement from the valve housing, permitting the mandrel and the intermediate housing assemblage to be retrieved from the well.
REFERENCES:
patent: 3786866 (1974-01-01), Tausch et al.
patent: 4344602 (1982-08-01), Arendt
patent: 4577694 (1986-03-01), Brakhase, Jr.
patent: 4624315 (1986-11-01), Dickson et al.
patent: 4796708 (1989-01-01), Lembcke
Baker Hughes Incorporated
Neuder William P.
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