• Patent Title: Oil production using multistage surfactant polymer chemical flood
  • Application No.: US15538424
    Application Date: 2015-12-21
  • Publication No.: US10094207B2
    Publication Date: 2018-10-09
  • Inventor: Jeffrey George Southwick
  • Applicant: SHELL OIL COMPANY
  • Applicant Address: US TX Houston
  • Assignee: SHELL OIL COMPANY
  • Current Assignee: SHELL OIL COMPANY
  • Current Assignee Address: US TX Houston
  • International Application: PCT/US2015/067137 WO 20151221
  • International Announcement: WO2016/106230 WO 20160630
  • Main IPC: E21B43/20
  • IPC: E21B43/20 C09K8/584
Oil production using multistage surfactant polymer chemical flood
Abstract:
A process for recovering oil from an oil-bearing formation is disclosed comprising providing a first oil recovery formulation comprising a first surfactant able to create low interfacial tension with reservoir crude oil; injecting the first oil recovery formulation into the oil-bearing formation via an injection well (201); providing a second oil recovery formulation having a second surfactant with a higher solubility in water than the first formulation; injecting the second oil recovery formulation into the oil-bearing formation via the injection well; and producing oil to a production well (203).
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