Wells – Processes – Operating valve – closure – or changeable restrictor in a well
Patent
1982-05-10
1984-06-12
Purser, Ernest R.
Wells
Processes
Operating valve, closure, or changeable restrictor in a well
166150, 166184, 166250, 166321, 166332, E21B 3414, E21B 4312, E21B 4706, E21B 3312
Patent
active
044535996
ABSTRACT:
A method and apparatus for annulus flow systems in which a safety valve controls flow adjacent the packer and the safety valve is operated by control of tubing pressure exerting an upward force on the valve operator and an urging device such as a weight string of tubing exerting a downward force on the operator. In one form the control valve is a foot valve below the packer which is automatically closed by removal of the actuator. In other forms the control valve is removable with the tubing string and a separate foot valve may be provided below the packer, if desired. The system may be designed to close the safety valve in direct response to a reduction in pressure in the well annulus, or it may be designed to reduce or increase tubing pressure and close the safety valve in response to any well condition sensed at the surface which would include a reduction in annulus flow pressure.
Provision is made for a pressure sensing instrument to be associated with the control valve and the control valve may be opened and closed by changing tubing pressure to obtain well data. In one form when the sensing instrument is removed the tubing is automatically closed. In another form after the sensing instrument is removed, a plug is run to close the lower end of the tubing.
REFERENCES:
patent: 3375874 (1968-04-01), Cherry et al.
patent: 3494417 (1970-02-01), Fredd
patent: 3964305 (1976-06-01), Wray et al.
patent: 4274486 (1981-06-01), Fredd
Dang Hoang C.
Otis Engineering Corporation
Purser Ernest R.
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