Analysis of factors affecting effect of in-situ foam profile control based on injection and production parameters
In response to the unclear factors affecting the application effect of in-situ foam control technology in medium-deep high-temperature oil reservoirs in Bohai Sea,a numerical simulation model for the whole reservoir was established based on a medium-low permeability oil reservoir.The influence of factors on the effectiveness of in-situ foam control technology was researched,such as foam system volume,profile control rounds,injection process,liquid production increase after profile control,interference from surrounding water wells,profile control timing,and combined profile control technology.The results show that:1)Better profile control effects would be obtained based on single factor analysis if the foam system volume used is large,the profile control round is early,the foam agent slug is"injected separately"from the in-situ gas generation slug,the fluid production does not increase in the response wells or the injection does not decrease in the surrounding water wells after profile control,the profile control timing is earlier(with a water cut of 60％),and the combination of the in-situ foam system and other sealing systems.2)Based on orthogonal experimental analysis,the"separate injection"of foam agent slug and in-situ gas generation slug has the most significant impact on profile control effect,followed by the foam system volume(the optimal volume is 0.002 4 PV),combined profile control(gel+in-situ foaming system),and profile control timing(60％water cut);The fluid production increase after profile control,the fluid production decrease in surrounding wells,and the profile control rounds have no significant impact on the profile control effect.3)Field application shows that the profile control effect can be improved by increasing the combination profile control of the gel+in-situ foam system or increasing the system volume(0.002 4 PV)/adopting the"separate injection"mode of gas generation slug and foam agent slug.The validity period is extended from 3 to 13 months in the first round,and the oil production increases from 7 270 m3 to more than 11 000 m3 in the first round.This research achievement has good guiding significance for the application of profile control technology in high-temperature,medium-low permeability oil fields of the same type.
high-temperature reservoirin-situ foamprofile control effectinfluence factorreservoir numerical simulationorthogonal experimental design
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