Wells – Processes – Separating material entering well
Patent
1977-10-19
1979-07-17
Novosad, Stephen J.
Wells
Processes
Separating material entering well
166268, E21B 4316, E21B 4318
Patent
active
041610474
ABSTRACT:
A process for the recovery of hydrocarbons from oil field reservoirs, wherein dry pipeline quality natural gas, essentially entirely methane, is injected, stored and recycled in the wells of the reservoir to effect a significant recovery of the oil in the reservoir while storing and holding the gas for ultimate use only after the oil has been recovered from the reservoir, whereby the relatively scarce gas is utilized to its maximum extent and oil is produced which would be otherwise difficult or uneconomical to produce by prior known processes.
The process can be utilized in an oil reservoir at any stage of pressure depletion; but, is most uniquely applicable in oil reservoirs which are: (1) essentially depleted of primary energy, (2) reservoirs which have undergone successful secondary recovery processes (primarily water flooding), (3) reservoirs which have undergone unsuccessful secondary recovery efforts due to adverse rock or fluid properties which caused premature breakthrough of injected or "driving" fluid, (4) in primary depleted reservoirs which are not considered as candidates for secondary recovery processes, or (5) reservoirs which have undergone tertiary recovery processes which have left substantial volumes (or percentage saturation) of oil in-place.
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Muskat, Morris, Physical Principles of Oil Production, First Edition 1949, McGraw-Hill Book Co., Inc., N.Y., N.Y., pp. 376, 377, 483, 486, 490 and 491.
Morrow, "Updip Oil Recovery by Downdip Gas Injection", The Petroleum Engineer, 4-1957, vol. 29, No. 4, pp. B-28 to B-32.
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