Abstract: The water production of the oil wells is a common problem in exploitation, which makes serious influences on production of oil wells, gathering and transportation of gas and oil, and the exploitation of oil fields recovered by water injection. The water plugging agent composed of alteredcolophonypolymer (DM3) is chosen as the first slug and watershutoff experiments done on coarse porefracture cores. The result shows that this slug has good capability of temporary plugging and selective sealing on core. Dipping in diesel for 24 hours, the oil deplugging is greater than 82%, and the formation damage is less than 25%, as the time of deplugging gets longer, the deplugging is getting better and temporary plugging decreases. The basic formulation of thick particle cement has been determined through a series of experiments. The adjustments of the operation function have been finished. Field operation in Well Jin78 in Sichuan Jinhua is successful.
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Key words: water plugging, complexslug, polymer, thick particle cement, Well Jin 78