Tertiary recovery method using inverted deviated holes
A method is described of recovering oil and the like from a subsurface earth formation comprising the steps of: establishing a substantially vertical shaft hole extending from the surface of the earth of the subsurface earth formation, boring from the vertical shaft initially in an essentially upward direction in the formation at least one deviated hole in the formation, the deviated hole having an upper end and communicating at its lower end with the vertical shaft, forming from an upper end in the vertical shaft in an essentially downward direction an outer borehole in the subsurface earth formation in proximity with the deviated hole, the outer borehole communicating with the vertical shaft and horizontally overlapping the deviated hole, and directing recovery enhancing fluids from the surface through the upper end of the vertical shaft to the outer borehole and injecting the fluids into the formation in proximity with the deviated hole whereby the fluids injected into the earth formation in proximity with the hole facilitates drainage of oil and the like into the upwardly directed deviated hole.
- Assignee:
- Hydril Co., Los Angeles, CA
- Patent Number(s):
- US 4646836
- OSTI ID:
- 7096832
- Resource Relation:
- Patent File Date: Filed date 20 Dec 1984
- Country of Publication:
- United States
- Language:
- English
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