强渗透缓速酸液体系研究与评价

刘芳慧; 张世昆; 曹耐

doi:10.12358/j.issn.1001-5620.2022.03.016

强渗透缓速酸液体系研究与评价

doi: 10.12358/j.issn.1001-5620.2022.03.016

中国石油化工股份有限公司石油工程技术研究院, 北京102206

基金项目: 中石化科技部课题“风化壳岩溶区井周缝洞高效酸压技术研究”（P20042-4）；中国石化石油工程技术研究院创新空间项目课题“耐高温自渗吸缓速酸研究”（SYGCY-CX-10）

详细信息

作者简介:
刘芳慧，助理研究员，博士，1990年生，毕业于中国科学院化学研究所物理化学专业，现从事储层改造关键流体材料及添加剂的研发工作。电话15652039701；E-mail：liufh.sripe@sinopec.com

中图分类号: TE357.12
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出版历程
- 收稿日期: 2022-01-10
- 修回日期: 2022-03-05
- 刊出日期: 2022-05-30

Study and Evaluation of Highly Permeable Retarded Acids

Sinopec Research Institute of Petroleum Engineering, Beijing 102206

摘要

摘要: 在碳酸盐岩储层的酸化压裂改造过程中，酸液质量的优劣直接影响着最终的改造效果。目前，常用的酸液体系存在渗透性差、腐蚀高、缓速效果不佳等问题。通过室内实验，研选出了适宜的复合有机缓速酸主体酸液以及酸用降阻剂、缓蚀剂和铁离子稳定剂等助剂，开发出了一套适合碳酸盐岩储层的新型强渗透缓速酸液体系。实验室综合评价结果表明，该强渗透缓速酸液体系具有良好的缓速性能、较低的腐蚀速率以及更优的渗透性能。此项研究对碳酸盐岩油藏储量的充分动用及高效开发具有重要的理论指导意义和实际应用价值。
- 碳酸岩储层 /
- 强渗透酸液 /
- 有机缓速酸 /
- 酸岩反应
Abstract: In acid fracturing carbonate reservoirs, the quality of the acid directly affects the quality of the stimulation. Problems with the acids presently used in fracturing operation include low permeability, high corrosion rate and poor retarding performance. To solve these problems, an acid used as the main component of a compound organic retarded acids, a drag reducer for acidizing operation, a corrosion inhibitor and an iron ion stabilizer were selected to formulate a new high permeability retarded acid suitable for use in acidizing carbonate reservoirs. Laboratory experimental results showed that this new retarded acid has good retarding performance, low corrosion rate and better permeating ability. This study is of theoretical guiding significance and practical application value for fully and efficiently developing carbonate reservoirs.
- Carbonate reservoir /
- High permeability acid /
- Organic retarded acid /
- Acid-rock reaction

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图 1 室温下15.0 %HCl与复合有机酸的滴定曲线

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图 2 不同缓速酸液体系的酸岩反应速率

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图 3 不同缓速剂酸液体系反应过程

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图 4 渗透组分对酸液pH值的影响

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图 5 酸液在碳酸盐岩表面的接触角

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图 6 腐蚀前后钢片照片

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图 7 90 ℃时，不同酸液体系与大理石块的反应过程

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图 8 90 ℃下胶凝酸与强渗透缓速酸液的酸岩反应速率及黏度

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图 9 强渗透缓速酸液的降阻率曲线

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表 1 90 ℃下不同酸液的缓速能力

酸液配比	反应5 min 消耗质量/g	缓速率/%	36 h溶蚀质量/g
15.0 % HCl	27.63		38.24
草酸+10.0% HCl	3.84	86.10	18.45
乳酸+10.0% HCl	3.56	87.12	19.29
有机酸A +10.0 % HCl	3.07	88.89	23.61
有机酸B +10.0% HCl	2.43	91.21	24.74
复合有机酸液	1.29	95.33	28.45
注：复合有机酸液：有机酸A+有机酸B+10.0%HCl

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表 2 加入不同缓速剂的酸液体系溶蚀能力

酸液体系	反应前质量/g	反应24 h后质量/g	溶解率/%
复合有机酸液	69.407	49.004	29.39
X	69.046	49.050	28.96
Y	69.236	50.569	26.96
Z	69.238	57.738	16.61

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表 3 90 ℃下缓蚀剂SRAI-1对钢片的缓蚀效果

盐酸浓度/%	挂片编号	前重/ g	后重/ g	失重/ g	腐蚀速率/ g·(m²·h)^-1	平均值/ g·(m²·h)^-1
20.0	P1112	11.7733	11.7687	0.0046	0.85	0.78
20.0	P1113	11.7588	11.7550	0.0038	0.70	0.78

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表 4 不同添加剂在酸液中的现象

加入的添加剂	室温	90 ℃
有机酸A + 有机酸B	澄清、透明	澄清、透明
缓速剂Y	澄清、透明	澄清、透明
渗透剂W	澄清、透明	澄清、透明
降阻剂SRAP-2	澄清、透明	澄清、透明
缓蚀剂SRAI-1	澄清、透明	澄清、透明
铁离子稳定剂SRAF-1	澄清、透明	澄清、透明
加入所有添加剂	澄清、透明	澄清、透明

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