Fracture Character And Administer Means For Ultra-low Permeability Oilfield Of West Daqing

The Xinzhan oilfield is a ultra-low permeability oilfield of West Daqing, with reservoir crack upgrowth, it had mostly represent that water of a few of oil well had been appeared fastly, and moisture had been rised fastly, turnout had been falled fastly, Oil well had appeared water without certain way, and adjustment is very difficult. Through develop reservoir geologic feature research, beaten out the regional structural feature, reservoir characterization, fluid property, juice distributional characteristics and formation pressure and temperature. Through technology instrument of core analyse, difference strain means, side wall avalanche means, microear thquake wave means, micro-resistivity scanning imaging and array sonic logging, we develop reservoir crack characteristic research, get know clearly man-made fracture and natural fracture upgrowth degree and azimuth, man-made fracture trend to direction for NE71.4~113.7°, natural fracture without distinctness directionality. Through dynamic analysis, get know clearly crack to waterflooding' detrimental effect. For improvement development of the field effect, difference object and difference stage adopt different governing means, at early field life, through Poisson ratio law ascertain injection well injection pressure upper limit, we adopt constant pressure water flooding to manage systematicly injection well, delay water trouble hour. Water trouble infancy, on time proceed waterflood project adjust or calking injection profile modifacation, control containing water ascensional velocity. After oil well water flood, through injection-production system tune-up test, alleviate crack versus waterflooding' detrimental effect, slacken field output descending, develop three strain testof five-spot water flooding, line flooding and irregularity water flooding, procure definite effect. In company with topping up time prolong, oil well begin multilayer, multiaspect water breakthrough interlamination and surface contradiction more protrusion, abatement hardness increase, wherefore for the first time at special low permeability oil field develop whole calking injection profile modifacation test, adopt fuzzing mathematics means foundation optimize injection profile modifacation phreatic syntheses judge model, simultaneous binding oil and water well connected relation, well group water breakthrough case and injection pressure, optimize injection profile modifacation block, through in-house experiment optimize plug up agent dispensation, through develop whole calking injection profile modification, adjust interlamination and surface contradiction, control know block decline of production, ameliorate block exploitation effect. Through adopting difference governing means, for the moment oil field daily oil output stabilize at 280 ton, increased rate of water drop down to 1.22%, oil field natural decline rate by 25% control at 12% within, form the comprehensive treatment effective method to improvement exploitation effect without distinctness direction special low permeability fissured oil field, for active exploitationthe which low and Ultra-low permeability oil field with microcrack of Daqing highly reserve technology.