Method and system of air foam to assist steam flooding to exploit heavy oil reservoir

Abstract

The invention discloses a method and system of air foam to assist steam flooding to exploit a heavy oil reservoir. The method of air foam to assist steam flooding to exploit the heavy oil reservoir comprises the steps that an appropriately exploited oil reservoir is screened; an implemented well group is determined in the appropriately exploited oil reservoir; a steam injection well section of theimplemented well group is injected with air foam in a plugged mode; and steam or air and steam are injected into a steam injection well of the implemented well group. The method and system of air foam to assist steam flooding to exploit the heavy oil reservoir are suitable for heavy oil reservoir profile controlling and flooding with a high water content and serious heterogeneous, and accordinglythe purposes that gas channeling of a high permeability layer is blocked, and the oil recovery rate is improved are achieved.

Description

technical field [0001] The invention relates to the field of heavy oil exploitation, in particular to a method and system for exploiting heavy oil reservoirs by air foam-assisted steam flooding in the later stage of oilfield steam flooding. Background technique [0002] refer to figure 1 The mechanism of steam flooding shown above is that steam flooding oil recovery is that the injection well continuously injects high-dryness steam into the oil layer, and the steam continuously heats the oil layer, thereby greatly reducing the viscosity of the formation crude oil. The injected steam turns into hot fluid in the formation, drives the crude oil around the production well, and is extracted to the surface. [0003] The reserves suitable for steam flooding development in China are 450 million tons. After nearly 30 years of development, the development of heavy oil steam injection development reservoirs in Xinjiang and Liaohe has entered the middle and late stages. Due to steam fl...

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Problems solved by technology

However, for most heterogeneous (medium-high-permeability interlayer) thin layers and horizontal formations without dip angles in my country, the oil displacement efficiency of simple air injection is limited due to gas channeling and viscous fingering, which will also cause oxygen channeling into the oil well and cause some Security risks

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