Repair and insulation works at the fields of RN-Purneftegaz LLC are complicated by absorption of plugging compositions by water-gas-bearing and depleted formations. According to the results of analytical and laboratory studies, the technologies based on reinforced polymer compositions forming an insulating screen, as well as compositions with instant filtration forming a filtration crust, are potentially applicable for the conditions under consideration. The article describes the results of pilot field tests of the technology for elimination of process liquids absorption during repair and insulation works using reinforced polymer composition.
During laboratory studies the formulation of the composition characterized by minimum gelation time and meeting the requirements for physical and chemical properties was substantiated. To achieve the required colmatizing ability on the model of highly permeable pore reservoir the necessity of using the composition with fillers of both types - chrysotile and fiber was confirmed. The ability of the composition not only to eliminate absorption but also to block gas breakthrough was also noted. The wells characterized by intensive absorption of process fluids, but with different purposes of repair and isolation works were selected for testing of the technology: shutdown of the formation with transition to the overlying horizon, elimination of continuous injectivity of the formation before sidetracking, elimination of leakage of the production string. The application of this technology allowed significant reduction of the injectivity factor of the formation to ensure subsequent isolation of the interval in one approach by cement slurry injection (the technology is not applicable for elimination of continuous injectivity without cement slurry completion).
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