西南石油大学学报(自然科学版)

• 油气化学工程 • 上一篇    下一篇

硫酸钡溶垢效果影响因素实验研究

李洪建1 *,孙建波1,2,李然1,于晓伟1,王德玉3   

  1. 1. 西南石油大学石油与天然气工程学院,四川成都610500
    2. 东营市诺尔化工有限责任公司,山东东营257300
    3. 中国石油长庆油田分公司第六采油厂,陕西西安710018
  • 出版日期:2016-06-01 发布日期:2016-06-01
  • 通讯作者: 李洪建,E-mail:lhj63@263.net

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

摘要:

为了研究溶垢剂DEED 溶垢效果的影响因素,采用失重法对溶垢剂开展了溶垢剂浓度、温度、时间以及pH 值
对溶垢效果影响因素实验研究。首先,采用化学方法对溶垢剂的溶垢机理进行分析,得出溶垢剂DEED 中能够与Ba2+
发生螯合反应的主要官能团,从而更准确合理地解释各因素对溶垢剂溶垢效果的影响。其次,对影响溶垢剂溶垢效果
的因素进行实验研究。在实验条件下,溶垢剂浓度为9% 时,溶垢率高达82.41%。溶垢时间和温度对溶垢效果影响较
大,随着溶垢时间的增加,溶垢率逐渐增加,在前24 h,溶垢率增加幅度较大,符合油田施工要求。在溶垢时间为24 h
时,当温度从25 ?C升高到85 ?C 的过程中,溶垢率由32.02% 增加到82.88%。pH 值对溶垢剂化学结构中羧基的电离
度及鳌合性能影响很大,从而影响溶垢剂溶垢效果,在溶垢时间为24 h 时,当pH 值从6 增加到12 的过程中,溶垢率
从8.37% 增加到81.26%,在油田施工时,可以考虑注入碱性前置液。

关键词: 溶垢机理, 硫酸钡, 温度, 时间, pH 值

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

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