Visbreaking-enhanced thermal recovery method utilizing high temperature steam
Patent
·
OSTI ID:6515989
The displacement efficiency of a steam drive process is improved and steam override reduced by rapidly injecting a predetermined amount of high temperature steam via an injection well into the formation to visbreak a portion of the oil in the formation prior to a steam drive wherein steam is injected into the formation via the injection well to displace oil to a spaced-apart production well through which oil is recovered. The visbroken oil provides a more favorable transition of mobility ratio between the phases in the formation thereby reducing viscous fingering and increasing the displacement efficiency of the steam drive. In addition, after a predetermined amount of high temperature steam has been injected into the formation, the formation may be allowed to undergo a soak period prior to the steam drive. The high temperature steam injection and soaking steps may be sequentially repeated for a plurality of cycles.
- Assignee:
- Mobil Oil Corp.
- Patent Number(s):
- US 4456066
- OSTI ID:
- 6515989
- Country of Publication:
- United States
- Language:
- English
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