Experimental study and application on proﬁle control using high-temperature foam
Through single-core and dual-core experiments, blocking and proﬁle control capability of high-temperature foam were investigated. Experiment results indicate that with the increase of foam quality, the resistance fac-tor reduces, and the best foam quality is 0.50. The resistance factor increases with permeability, and de- creases with temperature. Co-injection of surfactant solution and gas is better than SAG injection. During the hot water reverse injection period, resistance factor decreased to 75, and then basically remained stable. Irreducible oil in sandpack can reduce blocking capability to some extent. When the permeability ratio is less than 6, the proﬁle control effect is good. As the increase of permeability ratio, proﬁle control effect decreases.High-temperature foam still has some proﬁle control capability in sandpacks with irreducible oil. Foam in porousmedia can withstand reverse ﬂow of water under high-temperature conditions. In site application forsteam proﬁle control using high-temperature nitrogen foam, oil production improvement and water cut decreaseare obvious. This technology is useful for improving oil production in cyclic steam stimulated wells.