Research and application of DCA microspheres as deep profile control agent in low permeability reservoir

Year 2019, Volume: 5 Issue: 3, 131 - 134, 30.11.2019

Xuedong Shi , Xiang’an Yue Mingda Dong Changchun Yang

Abstract

Many chemical
profile agents have been widely adopted to control water content. Polymer
microsphere is a new potential profile control technology developed rapidly in
recent years. According to the diameter of reservoir rock throat, the polymer
microspheres matching the throat diameter are prepared by nano-micron material
synthesis method. The mechanism of profile control is that the microspheres can
move freely in the porous media after entering the reservoir with injected
water. The polymer microspheres accumulate in the throat to block up and cause
resistance to the flow, so that the subsequent flow will turn around and flow
around. Because the microspheres have the certain degree of viscoelasticity,
the microspheres will be elastic deformation as the plugging pressure
difference increases to a certain extent. Then the polymer microspheres
continue to migrate deeply through the throat, so as to achieve step-by-step
deep profile control and flooding.

In this article, divinylbenzene-co-acrylamide microspheres (DCAMs) with different
particle size were firstly prepared by using dispersion polymerization. Then
their physical properties such as chemical structure, micromorphology, particle
size and size distribution, swelling property and stability were reseached. The
core displacement experiment under the simulated reservoir conditions was designed
to analyze the recovery and profile modification performance of DCAMs.

Keywords

microspheres, low permeability

References

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