Wells – Processes – Cyclic injection then production of a single well
Patent
1997-03-26
1999-02-16
Schoeppel, Roger
Wells
Processes
Cyclic injection then production of a single well
166 53, 166 64, 166370, 166372, 137155, 417113, E21B 4300
Patent
active
058710485
ABSTRACT:
A method is provided for automatically determining an optimum gas injection rate for a gas-lifted oil well. The optimum gas-lift slope for the oil well is initially provided and stored in the memory of a programmable logic controller. A lift gas is injected into the well at an initial gas injection rate to displace a liquid at an initial liquid production rate from the well. The initial liquid production rate and initial gas injection rate are stored in the memory. Thereafter, the lift gas is injected into the well at a first incremental gas injection rate differing from the initial gas injection rate by a first incremental value. Additional liquid is displaced from the well at a first incremental liquid production rate and the first incremental liquid production rate and first incremental gas injection rate are stored in the memory. The first incremental slope is determined from the stored data points and compared to the optimum gas-lift slope. The procedure is repeated for a second incremental gas injection rate, wherein the second incremental value is selected as either positive or negative in response to the comparison of the first incremental slope and the optimum gas-lift slope. The second incremental slope is determined from the stored data points and compared to the optimum gas-lift slope. In response to this comparison, the first incremental gas injection rate is determined to be the optimum gas injection rate or the above-recited procedure is repeated for a third incremental gas injection rate and additional incremental gas injection rates, if necessary, until an incremental gas injection rate is determined to be the optimum gas injection rate.
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Smith Brian E.
Tokar Timothy J.
Brown Rodney F.
Chevron U.S.A. Inc.
Schoeppel Roger
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