中性螯合体系对无机堵塞物的溶蚀机理及性能评价
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1.中国石油大学北京非常规油气科学技术研究院;2.中国石油冀东油田公司;3.北京华油油气技术开发有限公司;4.北京德美高科科技有限公司

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中国石油天然气集团公司创新基金(批准号2021DQ02-0202);中国石油大学(北京)科学基金(批准号2462020XKBH013);国家自然科学基金(批准号52174046)


Corrosion mechanism and performance evaluation of inorganic blockages by neutral chelating system
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Unconventional Oil and Gas Science and Technology Research Institute, China University of Petroleum, Beijing

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    摘要:

    酸化解堵技术常用于解决碳酸盐岩油藏在长期开发过程中滋生的储层污染、供液不足等问题。常规酸化技术因碳酸盐岩油藏物性特殊,在生产过程中易出现水锁、腐蚀管柱、井筒结垢等现象,导致储层受损,降低储层产能。为此本文研发出解除无机堵塞物,不需返排,不对地层产生二次伤害的中性螯合体系。以螯合剂EDTA和缓蚀剂PAA为主要成分,加入少量稳定剂Na2SO3,经去离子水融合过滤,120℃脱水研磨粉碎,500℃焙烧活化制备而成。实验表明,该体系对Ca2+、Mg2+离子无机堵塞物具有良好的溶蚀性,常温下24h内溶蚀率可达95%;对N80级钢材具有较好的缓腐蚀性,90℃环境12h腐蚀速率最高为4.45g/m2·h;对天然碳酸盐岩心平均溶蚀率可达70%以上;因此认为中性螯合体系具有较好的矿场应用潜力。

    Abstract:

    Acidizing plugging removal technology is often used to solve the problems of reservoir pollution and lack of liquid supply caused by long-term development of carbonate reservoirs. Due to conventional acidizing technology is special for carbonate reservoir, the conventional acidification technology is prone to water lock, corrosion of pipe string and wellbore scaling in the production process, leading to reservoir damage and reducing reservoir productivity. Therefore, this paper developed a neutral chelating system to remove inorganic plugging without backflow and secondary damage to the formation. Composing of chelating agent EDTA and corrosion inhibitor PAA, and a small amount of stabilizer Na2SO3 was added. It was prepared by deionized water fusion filtration, dehydration grinding and grinding at 120℃ and roasting activation at 500℃. The experimental results show that the system has good corrosion ability for inorganic plug such as Ca2+、Mg2+ ion, the corrosion rate is up to 95% within 24h at normal temperature. The corrosion rate of N80 steel is 4.45g/m2·h after 12h at 90℃. The average dissolution rate of natural carbonate cores can achieve more than 70%. Therefore, neutral chelation plugging removal system has a good potential for field application.

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  • 收稿日期: 2022-05-21
  • 最后修改日期: 2022-08-09
  • 录用日期: 2022-09-04
  • 在线发布日期: 2023-03-20
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