Wells – Processes – Distinct – separate injection and producing wells
Patent
1981-12-24
1984-06-26
Novosad, Stephen J.
Wells
Processes
Distinct, separate injection and producing wells
E21B 4324
Patent
active
044560664
ABSTRACT:
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.
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Gilman Michael G.
McKillop Alexander J.
Miller Lawrence O.
Mobil Oil Corporation
Novosad Stephen J.
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