Abstract

The heavy oil reservoirs in Henan oilfield are mainly thin-bedded viscous and unconsolidated with viscous oil. Many of which are suitable for cold production. Lab experiments show that high permeability channels can be created in the reservoir when a large amount of sand is produced, and that the oil displacement efficiency is significantly improved in presence of dissolved gas. Field pilot shows that the fluid is produced in a foamy oil form with sand-cut of 2-20% (in volume) and oil production of 16-30t/d, which is over 10 and 5 times as much as that of conventional recovery and cyclic steam stimulation in the same reservoir respectively.

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Keywords:
thermal method, upstream oil & gas, enhanced recovery, cold production, mpa, heavy oil reservoir, drillstem testing, oil reservoir, drillstem/well testing, field pilot
Subjects:
Improved and Enhanced Recovery, Formation Evaluation & Management, Thermal methods, Drillstem/well testing
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1998. Society of Petroleum Engineers
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