ABSTRACT
High Pressure Air Injection (HPAI) is a potentially enhanced recovery method. The main process is that the oxygen in compressed air injected into the high-pressure light oil reservoir reacts with a portion of crude oil to generate carbon dioxide at high temperature, then the flue gas including above carbon dioxide and nitrogen displaces the oil to enhance oil recovery. The air injection production method has many advantages, however, it is easy to cause gas breakthrough in practice. Once gas breakthrough caused, it may lead to the explosion accident in production wells. In order to reduce gas breakthrough and control mobility, this paper demonstrates the collaborative drive of air and foam. The technology not only takes the gas drive advantages, but also improves the reservoir heterogeneity and mobility ratio to develop swept volume and achieve the goal of high efficiency development.
