Abstract
Water shutoff in oil wells operated in naturally fractured reservoirs is one of the most complex types of geological and technical operations in the oil industry related to repair and insulation works, the success rate of which does not exceed 35–60 %. In order to increase the efficiency of such operations, a set of sealing compositions based on the processing of natural materials, such as sand, peat, rice husk is proposed. Using the methods of mechanochemical activation, it was possible to dissolve sand in a low-concentrated alkali and obtain a sealing compound reinforced with undissolved sand particles by gelating the resulting sodium silicate. When combining mechanically activated sand and peat, a hybrid sealing material with the ultimate shear stress 27.7±1.2 Pa was obtained. The same approach made it possible to activate rice husks containing up to 20 % biogenic silicon dioxide and obtain a hybrid sealing material with the ultimate shear stress of 16.2 ± 0.6 Pa. This makes it possible to consider materials from natural and plant-renewable raw materials very promising for repair and insulation work.
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