Low Pressure In Low Permeability Reservoirs Yield Liquid Damage Factor Analysis And The Study Of Protective Measures

The mission success rate of hydraulic fracturing and acidification was under 70% universally at the practice of producing in low pressure taw permeability oil-gas reservoir. The productive capacity in some oil and gas well didn't been recovered or enhanced even under-produced after hydraulic fracturing or acid treating. It is necessary to clarify the reservoir damage mechanism,damage type and damage extent of hydraulic fracturing and acid treating in low pressure / low permeability oil field. It would supply some technical base for establishing more rational clue of borehole operation and enhance the effect of hydraulic fracturing and acid stimulation.This article aims at the non ideal effect problem in reservoir reconstruction, utilizes theoretical analysis method,conventionality experimental analysis,mathematical-modeling method, Systematically and comprehensive did the research of reservoir damage of stimulation fluids ,combined with reservoir's case history.In abstract, this article starts out from different kinds of physical chemistry actions between fracturing fluids, acid treating fluids which has entered formation and sensibility mineral as well as formation fluid in the formation rocks, analyzed some damage mechanisms of water blocks of fracturing fluid filtrate residence, fracturing fluid residue obstruction, clay mineral bulge migration , crude oil emulsification and so on; probed into the potential damage factors of compatibility of acidizing fluid and reservoir rocks, secondary sedimentation and acidizing fluid loss.This article realized mat permeability of reservoir rock stress sensibility was ferocious, other factors' sensibility were inconspicuous except water-sensitive and alkali-sensitive through rock core sensibility evaluation experiment and stimulation fluids' conventionality damage experiment in reservoir. Presently, water-surveyed permeability damage rate of the carbamidine glue in-field used in reservoir is all above 54%. There maybe exist damage in the operation of acid treating.At the same time, for reparation conventional in-house experiment' insufficiency in only could carry out or semi-quantitative damage evaluation, mis article came up with a quantitative prediction with mathematical modeling research technique of reservoir damage in stimulating, and did some primary exploration of mathematical modeling on different kinds of damage; had found out relatively practical mathematical model and corresponding computational algorithm.On the base of involved model and related algorithm, compiled a quantitative prediction software in reservoir damage of hydraulic fracturing, acid treating fluids; did case history calculation and analyses and effective predication of oil well's damage type and extent , combined with oil well's basic parameter in research region , production performance data, petrophysics data as well as hydraulic fracturing/ acid treating fluids property.According to knowledge from numerous studies, this article present a set of hydraulic fracturing /acid treating techniques of protect reservoir in reservoir, offered a slip of efficient path of highly active developing low permeability oil field.