Abstract
The reservoir of some oilfields in southern Jizhong area features in small throat size and low permeability, and the seepage law of fluids does not conform to the Darcy’s law. Although the sand body of some reserves can be controlled by well patterns, effective driving system is still difficult to be set up. So injection wells are characterized by poor absorption and high injection pressure. The technology using chemical agents for injection well stimulation is to use FYR-ZZ, a friction reducing and flooding agent by synthesizing suitable surfactants, low-damage acid and adjuvant, to improve the absorbing capacity of low permeability oilfields. Results of the indoor study show that the FYR-ZZ has advantages in stimulation and can be used for decreasing interfacial tension, changing rock wettability, anti-swelling, and inhibiting microbial. The result of microscopic oil displacement experiment shows that the FYR-ZZ system may be used to displace the residual oil in pore, change the wettability of pore, and enable the lipophilic pore surface to be converted into hydrophilic surface. It provides technical reference for simulation of injection wells with low permeability.
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