Wells – Processes – Specific pattern of plural wells
Patent
1976-12-22
1978-04-25
Novosad, Stephen J.
Wells
Processes
Specific pattern of plural wells
166263, 166273, E21B 4322
Patent
active
040857972
ABSTRACT:
In the oil-bearing formation wherein primary production has been exhausted and secondary recovery by waterflooding is exhausted or about exhausted, the residual brine is removed by progressive displacement. In this displacement a centrally disposed injection well or, preferably, lineal injection wells are utilized for the initial injection of preflush fluid with the immediately adjacent production and/or injection wells being shut in. After a specified slug of preflush has been injected, a series of chemical slugs is injected followed by drive fluid. After displacement of the residual brine has been effected out past the adjacent shutin wells, as evidenced by the arrival of the preflush, they are utilized as production wells. After oil sweep to these wells is complete, they are used as injection wells and the procedure is moved another step outward.
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Uren, Petroleum Production Engineering, Oil Field Exploitation, 3rd Ed., McGraw-Hill Book Co., Inc., N.Y., N.Y., 1953, pp. 528-532.
Meldau Robert F.
Trantham Joseph C.
Novosad Stephen J.
Phillips Petroleum Company
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