Surfactant polymer composition for oil displacement and application thereof in tertiary oil recovery

Abstract

The invention relates to a surfactant polymer composition for oil displacement, and a preparation method and application thereof in tertiary oil recovery, and mainly solves the problems of poor oil displacement efficiency in the high-temperature high-salt reservoir, and corrosion and scale deposition damage of three-element composite displacement to the stratum and oil well in the prior art. The surfactant polymer composition for oil displacement comprises the following components in parts by weight: (1) 1 part of surfactant for oil displacement and (2) 0.01-0.1 part of polymer. The molecular general formula of the component (1) is disclosed in the specification, wherein R is C8-C40 alkyl group, R1 and R2 are independently selected from C1-C4 alkylidene group, n+m=2-100, and x=1-100; and the polymer is selected from at least one of ultrahigh-molecular-weight polyacrylamide, temperature-resistant salt-resistant polymer A and xanthan gum. The technical scheme well solves the problems, and can be used in tertiary oil recovery production of oilfields.

Description

technical field The invention relates to a polymer surface composition for oil displacement, a preparation method and its application in tertiary oil recovery. Background technique The main oilfields in my country have entered a high water cut period after primary and secondary recovery. How to improve oil recovery and maximize the development of remaining reserves, tertiary oil recovery technology has played a very important role in ensuring stable and high production of oil fields. Among new technologies for tertiary oil recovery, chemical composite flooding is still one of the most promising methods. After the oil field enters the high water cut period, the remaining oil is trapped in the pores of the reservoir rocks as a discontinuous oil film, and the two main forces acting on the oil droplets are viscous separation and capillary force. If an appropriate surfactant system is used to reduce the interfacial tension between oil and water, the resistance caused by the def...

AI Technical Summary

Problems solved by technology

One of the technical problems to be solved by the present invention is the poor oil displacement efficiency of the polymer surface composition for oil displacement in the high-temperature and high-salt oil layer in the prior art, and the corrosion and accumulation caused by the alkali in the ASP flooding to the formation and the oil well. The problem of scale damage

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