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Drive mechanisms and recovery (view source)
Revision as of 22:23, 21 July 2014
, 22:23, 21 July 2014→Production trends
Gas cap expansion causes reservoir pressure to fall more slowly in a gas cap drive reservoir than in one producing in a solution gas drive. The rate of pressure decline is closely tied to the relative size of the gas cap, with larger gas caps resulting in a more gradual pressure decline as oil is produced.
Gas cap expansion causes reservoir pressure to fall more slowly in a gas cap drive reservoir than in one producing in a solution gas drive. The rate of pressure decline is closely tied to the relative size of the gas cap, with larger gas caps resulting in a more gradual pressure decline as oil is produced.
Early in the life of a gas cap drive reservoir, the GOR rises slowly because the higher reservoir pressure keeps more gas in solution in the oil. Later, the GOR increases dramatically as the expanding gas cap reaches the highest wells on structure. The GOR continues to climb as the gas-oil contact moves farther down structure and gas cap gas production increases. Oil production rates fall less quickly than in a solution gas drive reservoir due to the slower decline in reservoir pressure. [[Artificial lift]] may not be required as early in the field's life since wells tend to have longer flowing lives. As in a solution gas drive, little or no water is produced.
Early in the life of a gas cap drive reservoir, the GOR rises slowly because the higher reservoir pressure keeps more gas in solution in the oil. Later, the GOR increases dramatically as the expanding gas cap reaches the highest wells on structure. The GOR continues to climb as the [http://www.glossary.oilfield.slb.com/en/Terms.aspx?LookIn=term%20name&filter=gas-oil%20contact gas-oil contact] moves farther down structure and gas cap gas production increases. Oil production rates fall less quickly than in a solution gas drive reservoir due to the slower decline in reservoir pressure. [[Artificial lift]] may not be required as early in the field's life since wells tend to have longer flowing lives. As in a solution gas drive, little or no water is produced.
===Recovery===
===Recovery===