Isomobility flooding and profile control integration technology

Abstract

The invention discloses an integrated technology of isofluidity oil displacement and profile control, which solves the problem that the oil layer profile control measures and the oil field injection process are operated separately, the profile control agent only has a plugging effect, and has no oil displacement effect, and the injection agent only has a flooding effect. The effect of oil, there is no problem of plugging effect. This technology uses multiple rounds of injection of chemical agents from the three-slug of equal fluidity at the end of the well, and injection of the profile control agent from the three-slug of equal mobility at the end of the oil well into the high water content and high permeability channel of the corresponding water well. The high-, medium-, and low-concentration slugs of the two injections are miscible with the water in the high-permeability waters between the two injections, and combined to transform into the third agent, the high-efficiency oil displacement agent, which is squeezed into the medium-low permeability area, displacing the medium-low permeability With crude oil with low water content, the swept volume and oil displacement efficiency can be improved; the technology can better reduce the fluidity of high-permeability channels and control water, and at the same time improve the liquid production capacity of medium and low-permeability layers, improve the effective use of injection agents and oil displacement efficiency, reduce injection The total amount of agent, injection time and injection cost can be adjusted to achieve the purpose of increasing oil and saving capital in the system as a whole.

Description

technical field [0001] The invention relates to a profile control technology of an oil layer in the development process of an oil field and an oil displacement injection technology of the oil field. Background technique [0002] At present, in the process of oilfield development and injection, there is no consideration of process integration and three-agent combination of reservoir profile control measures and oilfield injection. Profile control and injection are operated separately, and the profile control agent only has a plugging effect and has no oil displacement effect. The injection agent only has the effect of oil displacement and has no plugging effect. The organic combination of deep profile control and injection technology has not been considered, and the problem of synergistic effects and benefit maximization has not been studied. For example, conventional profile control methods may be used in the process of water injection and chemical agent injection. In any pe...

AI Technical Summary

Problems solved by technology

[0002] At present, in the process of oilfield development and injection, there is no consideration of process integration and three-agent combination of reservoir profile control measures and oilfield injection. Profile control and injection are operated separately, and the profile control agent only has a plugging effect and has no oil displacement effect. The injection agent only has the effect of oil displacement and has no plugging effect. The organic combination of deep profile control and injection technology has not been considered, and the problem of synergistic effects and benefit maximization has not been studied. For example, conventional profile control methods may be used in the process of water injection and chemical agent injection. In any period of time, the effect and benefit of deep profile control and injection technology are not considered synergistically; in addition, whether it is deep reservoir profile control technology or heavy oil thermal recovery profile control technology, existing profile control agents can effectively plug High-permeability reservoirs have dominant channels, but at the same time, oil reservoir plugging and pollution may occur, which will affect the displacement of remaining oil in high-permeability reservoirs, and the integrated technology of injection deep profile control is not considered