Method and apparatus for controlling a well

Patent · Tue Jun 12 04:00:00 EDT 1984

OSTI ID:6785751

Fredd, J V

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 pessure 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.

• Assignee: Otis Engineering Corporation
• Patent Number(s): US 4453599
• OSTI ID: 6785751
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020300* -- Petroleum-- Drilling & Production
03 NATURAL GAS
030300 -- Natural Gas-- Drilling
Production
& Processing
CONTROL
CONTROL EQUIPMENT
DESIGN
EQUIPMENT
FLOW REGULATORS
FLUID FLOW
MEASURING INSTRUMENTS
NATURAL GAS WELLS
OIL WELLS
PRESSURE CONTROL
PRESSURE MEASUREMENT
RESERVOIR PRESSURE
VALVES
WELL PRESSURE
WELLS