Abstract
The conventional foam plugging agent is susceptible to factors such as dilution of formation water, high temperature and high salinity, which usually shortens its effective period and undermine its application. Based on conventional foam plugging agents, an anti-dilution gelled foam plugging agent suitable for oil reservoirs with high temperature and high salinity is proposed in this paper. The research results show that the density of the gelled foam plugging agent (0.6∼0.9 g/cm3) is controllable and easy to prepare, and it can be stabilized at 130° and 2.2 × 105mg/L mineralization for at least 72 h. The indoor physical simulation experiments show that the plugging rate of gelled foam plugging agent is more than 98%, and the plugging effect is obvious, showing a good channeling plugging capability.
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