Polymer containing pendant tertiary alkyl amine groups useful in enhanced oil recovery using
This patent describes an improvement in a method for recovering oil from an underground oil-bearing earth formation penetrated by an injection well and a producing well, in which method carbon dioxide is injected into the formation to displace oil towards the producing well from which oil is produced to the surface. It comprises: injecting into the formation carbon dioxide, the viscosity of which is increased at least three-fold by the presence of a sufficient amount of a polymer containing pendant tertiary alkyl amine groups and a sufficient amount of a cosolvent to form a solution of the polymer in the carbon dioxide, wherein the minimum solubility parameter of the polymer is reduced to 6.85 (cal/cc)1/2 or less by control of the number of pendant tertiary alkyl amine groups and by the selection of the tertiary alkyl amine groups.
- Assignee:
- Chevron Research Co., San Francisco, CA (USA)
- Patent Number(s):
- US 4945989; A
- Application Number:
- PPN: US s 7-138545
- OSTI ID:
- 6505244
- Resource Relation:
- Patent File Date: 28 Dec 1987
- Country of Publication:
- United States
- Language:
- English
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