Pool description and performance analysis leads to understanding Golden Spike's miscible flood
Conference
·
OSTI ID:7214361
Reservoir description was a key factor in analyzing the performance of the Golden Spike vertical gravity controlled miscible LPG bank scheme. Understanding the performance of the pool was enhanced by including a detailed reservoir description in a computer model study of the miscible scheme. The originally designed 7 percent pore volume LPG bank was injected between the gas and oil zones from 1964 through 1975. Extensive monitoring of fluid distribution in this 1,385-acre, 480-foot thick reef complex indicated the miscible flood improved the oil recovery until 1973. A geological study incorporating data from infill wells drilled during the 1970's shows the reservoir contains many local barriers to vertical flow. Located in the interior of the reef, these barriers range in size from less than 5 to over 600 acres. Recent performance analysis indicates the barriers have resulted in by-passing of oil and loss of miscible flood benefits after 1973. As a result of the loss of miscibility, the pool is currently under gas drive and the miscible scheme has been terminated. Performance analysis results are confirmed by a cross-section computer model study of the pool. The cross-section model also indicates the vertical flow barriers combined with the designed bank size result in poor sweep efficiency by solvent. However, future sweep efficiency by gas is predicted to be high due to continued drainage of oil off the barriers.
- OSTI ID:
- 7214361
- Report Number(s):
- CONF-761008-129
- Country of Publication:
- United States
- Language:
- English
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