A low-concentration and high-efficiency composite oil displacement composition

Abstract

The invention relates to the oil field oil extraction field and particularly relates to a low-concentration and efficient composite oil displacement composition. The composition contains the followingcomponents: sodium lauryl sulfate, N-dodecyl N methylpyrrolidinium bromide and partially hydrolyzed polyacrylamide. The composition contains simple components, and a surfactant oil replacement groupis formed by an anionic surfactant, a cationic surfactant or an additional nonionic surfactant and a cosurfactant, so that the taboo that the anionic surfactant and the cationic surfactant are hardlysimultaneously used is broken through; and the surfactant oil replacement group is further combined with oil replacement components of the composition, and the advantages of surfactant oil replacementand polymer oil replacement are adequately utilized, so that the oil extraction efficiency is comprehensively improved. Compared with common oil displacement composition products, the low-concentration and efficient composite oil displacement composition has the advantages that the use amount is fewer when an oil replacement solution is formed, the oil extraction can be remarkably lowered, the huge economic benefit can be created, and the composition has a potential market value.

Description

technical field [0001] The invention relates to the field of oil recovery in oil fields, in particular to a low-concentration and high-efficiency composite oil displacement composition. Background technique [0002] Most of the oilfields in my country still have 60% to 70% residual oil left in the ground after primary oil recovery and secondary oil recovery, and it is difficult to recover. Now it has entered the stage of tertiary oil recovery. Tertiary oil recovery uses physical and chemical methods to change the properties, phases and interface effects of fluids, and expand the sweeping range of injected water to improve oil displacement efficiency. The current chemical methods for enhancing oil recovery can be divided into alkali flooding, polymer flooding, surfactant flooding and compound flooding developed on the basis of these. Because alkali flooding will bring a series of serious problems, such as clogging of reservoirs, scaling, corrosion of equipment and other envi...

AI Technical Summary

Problems solved by technology

[0003] There are some deficiencies in the current polymer / surfactant binary composite flooding formulations. The surfactant components in the relevant formulations are complex. Active agents (3 types and above) are compounded and co-surfactant is added, the total mass concentration is generally still above 0.1%, and the dosage is relatively large, and the price of active agents is much higher than that of polymers, so high-concentration active agents Increased economic cost of flooding solution

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