Unloading injection control valve
This patent describes a fluid pressure responsive valving apparatus for use with an annular downhole tool having a packing element responsive to a pressure differential between the bore of the tool and the surrounding annulus within the well bore, comprising: a tubular assembly connectable in series relation between a surface-connected well conduit and the downhole tool; removable plug means for closing the tubular assembly for permitting fluid pressure within the tubular assembly to be increased; a valve mounted in the tubular assembly and shiftable from a first position to a second position in response to increased fluid pressure within the tubular assembly; the valve in the first position connecting the bore of the tubular assembly to the annulus; resilient means urging the valve to the first position; the valve in the second position directing conduit fluid pressure into the bore of the downhole tool to expand the packing element thereof; and means responsive to the conduit fluid pressure for shifting the valve to the second position against the bias of the resilient means.
- Assignee:
- Baker Oil Tools, Inc., Orange, CA
- Patent Number(s):
- US 4576196
- OSTI ID:
- 5649507
- Country of Publication:
- United States
- Language:
- English
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