Wells – Valves – closures or changeable restrictors – Destructible element
Patent
1982-03-29
1984-01-24
Purser, Ernest R.
Wells
Valves, closures or changeable restrictors
Destructible element
166318, 137 70, E21B 3410
Patent
active
044270704
ABSTRACT:
A circulating sub is provided which is adapted for connection in a production tubing string of a flowing well and which defines a flow passage through which production fluid is enabled to flow. The body structure of the sub defines an equalizing port in communication with the annulus between the tubing and casing of the well, which port is normally closed by means of a sleeve valve. An actuating plug is dropped through the production tubing after shutting in the well and descends to the level of the circulating sub where it seats on the closed valve. Application of fluid pressure through the tubing develops sufficient pressure differential across the valve and plug to force the valve to its open position to thus communicate the tubing and annulus for pressure equalization. The plug member incorporates a check valve which permits accurate balancing of kill fluid to well pressure to thus permit emergency killing of the well without causing damage to the production formation.
REFERENCES:
patent: 2998075 (1961-08-01), Clark, Jr.
patent: 3273650 (1966-09-01), Alexander et al.
patent: 3789926 (1974-02-01), Henley et al.
patent: 4031957 (1977-06-01), Sanford
patent: 4176717 (1979-12-01), Hix
patent: 4298218 (1981-11-01), Britch
Bui Thuy M.
O'Brien-Goins Engineering, Inc.
Purser Ernest R.
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