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          CN 51-1183/TE

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    Your Position ：Home->Past Journals Catalog->2016 Vol.6

    Complex Acidizing Technique for Water-Injecting Wells in Zhenbei Oilfield
    Author of the article:Complex Acidizing Technique for Water-Injecting Wells in Zhenbei Oilfield
    Author's Workplace：China University of Petroleum (Beijing). Institute of Enhanced Oil Recovery
    Key Words：Water-injecting wells; Secondary precipitation; Complex acidification; Simulation experiment; Field application
    Abstract：Zhenbei oilfield has the problems of high injection pressure and serious secondary precipitation. According to the characteristic of complex lithologic strata and previous acidizing performance at Zhenbei oilfield, plug removal analysis were conducted and then proposed a complex acidizing formula aiming at damage removal for layer Chang 3 and Chang 8. To evaluate the character of this complex formula, three groups of experimental were conducted to study on fluids ability to remove damage resulted from water injection and performance of improving cores permeability. These experiments are: displacing fluid → oilfield reinjection water → pre-flush → main fluid → after-pad → displacing fluid. The results showed that both of the oilfield reinjection water and pre-flush can take toll on cores permeability, and the smaller the cores initial permeability is, severer the damage will be. However, pre-flush and main fluid are able to dissolve the solvable mineral particles in cores and react chemically with micro-particulates in water so as to recover and improve permeability of cores highly. Applications from oilfield showed the treatments applied to three test wells removed well-bore damage. The pressure of water injection obviously reduced and the step-down was highly stronger than former treatments. Better acidizing performance were obtained.

     


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