The KSJ-1 film-forming sand control agent developed for fine sandstone reservoirs has the characteristics of low damage rate to the formation, high erosion resistance, deep sand control on the oil layer, and no need for waiting on cement to save time. The sand control principle is that the amide group, amino group and positive charge of sand control agent adsorbs with the negatively charged, hydroxyl group of sand particles by electrostatic interaction, then form stable, uniform and porous molecular film. The molecular film can fix fine-siltstone or clay particles in normal position. Through the evaluation on the erosion resistance of the sand control agent, the results show that the sand control agent has good sand control effect. The erosion resistance of sand control agent can reach 6,000 mL·h-1, and the erosion resistance is much higher than that of the commonly used sand suppressant 900 mL·h-1. KSJ-1 has been used in five wells and the sand prevention success rate reached 100%. The application effect was good, the cumulative production of five wells increased to 6,200 tons by the end of May 2018.
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