Application Of Temporary Plugging, Acidization And Stimulation Technology In Low Permeability Reservoirs

Along with develops unceasingly for a long time, after the oil field enters the development mid and late part stage, present the oil field synthesis watery rise and mining benefit worses year by year. Specially regarding the Ansai low permeability sandstone reservoirs, as a result of the oil layer anisotropic water-oil viscosity ratio's difference, along with water-oil interface's advance, the flood water, side the water and so on along the high filter layer non-uniform advance, upwardly forms the irrigation cusping, causes the main force high filter layer interior mining contradictory aggravating. On longitudinal, because the level the difference, becomes the single-layer advance, after the oil field enters the development mid and late part, has the oil deposit mining level generally the contradictory aggravating, quite a main force oil layer completely has flooded, but the oil saturation high relatively low permeability reservoirs still could not obtain the use, thus leads the oil-field development difficulty to increase, the synthesis watery rapid rise.At present the high moisture content and the oil layer existence injury is one primary causes of many oil field which partial wells produce can lower. Mainly has two kinds to the well implementation section plane adjustment's chemistry method: first, oil well chemistry shuts off the water; second, oil well acidification. The water shutoff acidification is controls one of production increase key measures, has played the main body role in the improvement oil deposit development benefit aspect.