Deep-penetrating Matrix Acidizing Technology Of Low Permeability Sandstone In Jilin Oilfield

During the development of oil field,acidification,as a major measure of increasing production,has always received much attention,especially in those fields with low permeability and high water content.Not only can acidification completely break down the plug of the near wellbore zone caused by variety pollution,but it also effectively improves the reservoir permeability.Poor fluid permeation and low productivity , these basic characteristics of low-permeability oil field determined the enhanced recovery technologies are necessary to maintain normal production.Reservoir reformations can relieve or weaken the damage caused by drilling,completion and production operations, but these measures may also cause formation damage.How to reduce formation damage and improve the development effect of low-permeability oil field is the main developing trend of enhanced recovery technologies.In this article,combined with the reality,research on reservoir damage prediction,new acid formula system , and optimization test of acidizing deplugging system , strata acidification technology is presented for the problem arising from the acid treatments for the low-permeability sandstone reservoir in Jilin field.Based on these researches and tests,the technology of deep penetration matrix acidizing was formed,and design of cite test scheme and test result analysis were also presented.Study showed that the 80%coincident rate was received when using the reservoir damage prediction technology.The developed clean diverting retarded acid and microemulsified acid system is suit for the low-permeability reservoir reformation and effectively served the requirements of stimulation and stimulated injection in the reservoir with low permeability and high water content.