| Acidizing and fracturing,as important measures to increase production for oil and gas fields,has been more widely used,however,when they bring in the stimulation effect,they also bring in a series of negative effects,such as formation damage problems.As a result of the reservoir rock and fluid is not compatible,there will be water-sensitive clay minerals swell and roar power plug holes and other phenomena.In addition,secondary precipitation after acidification of matrix and the unreasonable construction parameters of the reservoir would also cause considerable impact.We hope that the effects of heating oil at the same time fully guaranteed maximum protection reservoir,therefore,the research of the potential damage of the acid — rock reaction in acidification have a very important significance.At present,these studies are mainly based on laboratory investigation,but from the experiment,we just gain a qualitative or semi-quantitative conclusion.This article aims at non ideal effect problem in reservoir reconstruction,utilizes theoretical analysis method,mathematical — modeling method and comprehensive did the research of damage of stimulation fluids.In theory,this article from the acid-rock reaction mechanism,analyzes the compatibility of the acid with the reservoir rock and fluid in acidification,secondary precipitation,clay mineral swelling,particle migration and the acid fluid loss and other factors of potential damage to the reservoir.Meanwhile,this article comes up with a quantitative prediction of formation with mathematical—modeling research technique of reservoir damage in simulating,focus on building a model of secondary precipitation and clay swelling effected by permeability and porosity,the corresponding algorithm obtained is more practical.Through this extensive research and the corresponding proposed solutions for reservoir damage,and provides some recommendations for the protection of oil and gas development in the reservoir. |
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