西南石油大学学报(自然科学版)

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An Experimental Study on Influencing Factors of Dissolution Effect of#br# Barium Sulfate Scale

LI Hongjian1*, SUN Jianbo1,2, LI Ran1, YU Xiaowei1, WANG Deyu3   

  1. 1. School of Petroleum and Natural Gas Engineering,Southwest Petroleum University,Chengdu,Sichuan 610500,China
    2. Dongying Nuoer Chemical Company Ltd.,Dongying,Shandong 257300,China
    3. No. 6 Oil Recovery Plant,PetroChina Changqing Oilfield Company,Xi′ an,Shaanxi 710018,Chin
  • Online:2016-06-01 Published:2016-06-01

Abstract:

To study the influence factors of the dissolving effect of scale dissolving solvent DEED,we conducted weight loss
method experiments on the effects of solvent concentration,temperature,time and pH value on scale dissolving. First,we
analyzed the scale-dissolving mechanism of DEED via chemical methods through which the main functional groups of DEED
that can chelate Ba2+ are found. As a result,the reason behind different scale dissolving effects under various conditions can
be explained more accurately and reasonably. Then,a number of experiments were conducted to study the influence factors
of scale dissolving effect of the agent. Under the experimental conditions,when the concentration of scale-dissolving agent is
9%,the highest dissolving rate of 82.41% would be attained. The scale dissolving time and temperature have a great impact
on scale dissolution. With the increase of acting time,scale dissolving rate gradually increases,and the scale dissolving rate
increases greatly during first the 24 hours,which satisfies the requirement of field application. With a 24-hour dissolving time,
dissolving rate increases from 32.02% to 82.88% as temperature increases from 25 ?C to 85 ?C. On the other hand,the pH
value has a significant influence on the dose of carboxyl ionization and chelating performance of scale dissolving agent,thus
affecting scale dissolving effect of the agent. With a 24-hour dissolving time,dissolving rate increases from 8.37% to 81.26%
as pH value increases from 6 to 12. Thus alkaline pre-flush injection is recommended in oil field operation.

Key words: mechanism of scale dissolution, barium sulfate, temperature, time, pH

CLC Number: