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Process for the secondary recovery of petroleum

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专利汇可以提供Process for the secondary recovery of petroleum专利检索,专利查询,专利分析的服务。并且Crude oil is recovered from a subterranean oil bearing formation by injecting an initial slug of an aqueous flooding medium containing a dissolved polymeric agent into the formation to displace the oil toward at least one output well communicating with the formation and then following the initial slug with a secondary aqueous slug having a dissolved polymer concentration of less than about one-third that of the initial slug but not in excess of 100 p.p.m.,下面是Process for the secondary recovery of petroleum专利的具体信息内容。

  • 2. The process of claim 1 wherein the secondary slug contains the same polymer as the first slug.
  • 3. The process of claim 1 wherein the viscosity of the initial slug is greater than about one-half of 1 percent of the viscosity of the oil to be displaced.
  • 4. The process of claim 1 wherein the concentration of the secondary slug is one-fourth to one-tenth that of the initial slug.
  • 5. The process of claim 1 wherein the mobility factor of the secondary polymer bank is at least twice the mobility factor of the brine or water after polymer treatment.
  • 6. The process of claim 1 wherein the dissolved polymer is a polyacrylamide.
  • 7. The process of claim 6 wherein the polyacrylamide is partially hydrolyzed.
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