Abstract
Abstract Daqing Lamadian oil field is the largest oil field with a gascap in China. Monitoring, controlling and adjusting techniques have been used extensively to minimize cross flow. An inverted nine-spot pattern was used in the oil-bearing area. Gas-bearing layers were not perforated and there was a 400 to 600m buffer zone of oil and gas migration left between oil-and gas-bearing areas. A monitoring system for gas-cap performance was established. Flow between the oilbearing and gas-bearing layers has been successfully controlled and a relatively stable oil-gas interface has been maintained for 20 years.
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