| 摘要 |
<p>OIL RECOVERY BY ALKALINE-SULFONATE WATERFLOODING Recovery of oil from a subterranean reservoir employing an alkaline agent-sulfonate surfactant system in conjunction with the injection of a sacrificial system comprising an inorganic polyphosphate and an alkali metal carbonate. An aqueous initiation slug containing an inorganic polyphosphate, an alkali metal carbonate and an alkaline agent selected from the group consisting of alkali metal and ammonium hydroxides is injected into the reservoir. The initiation slug is followed by the injection of an aqueous surfactant slug which contains an alkaline agent and a sulfonate surfactant. After injection of the surfactant slug, an aqueous flooding medium is injected in order to displace the oil within the reservoir to a production system from which it is recovered. The surfactant slug may also contain an inorganic polyphosphate and alkali metal carbonate and the concentrations of these agents in the surfactant slug may be lower than in the initiation slug.</p> |
