吸附型缓速酸体系的开发与应用

李泽锋; 王改红; 姬随波

doi:10.3969/j.issn.1001-5620.2019.01.022

吸附型缓速酸体系的开发与应用

doi: 10.3969/j.issn.1001-5620.2019.01.022

川庆钻探工程有限公司长庆井下技术作业公司, 西安 710021

基金项目:

国家科技重大专项“储层改造关键流体研发”（2017ZX05023-003-006）

详细信息

作者简介:
李泽锋,工程师,1989年生,主要从事储层改造液体研发及增产相关工作。电话(029)86021710;E-mail:cj_lizef@cnpc.com.cn

中图分类号: TE357.2
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出版历程
- 收稿日期: 2018-09-19
- 刊出日期: 2019-02-28

Development and Application of an Adsorptive Retarded Acid

Changqing Downhole Technology Operating Company, Chuanqing Drilling Engineering Limited Company, Shaanxi Xi'an 710021

摘要

摘要: 针对目前常规酸液体系反应速度快，有效作用距离短，刻蚀效果差等问题，研究了一种吸附型缓速酸体系。该体系通过缓速剂中阳离子疏水基团吸附在岩石表面，形成保护膜将酸液中H⁺隔离，延缓酸岩反应时间，提高酸蚀裂缝长度及非均匀刻蚀程度。进行了酸液、添加剂加量优化，得到缓速酸体系配方。性能评价结果表明，该体系缓速率为91.2%，缓蚀率为99.6%，缓速酸与岩石反应形成了较明显的沟槽且导流能力随闭合压力升高降幅较小，缓速效果明显。该体系在苏里格地区得以成功应用，单井产气量是相邻井产量的5倍左右，改造效果显著。
- 吸附 /
- 缓速酸 /
- 导流能力 /
- 储层改造
Abstract: Conventional acids for acidizing job have some disadvantages such as fast reaction, short effective functioning distance and poor erosion etc. To address these problems encountered in acidizing with conventional acids, an adsorptive retarded acid was developed, in which the hydrophobic cationic groups of the retarder are able to adsorb on the surfaces of formation rocks, forming a protective membrane to shut off the contact of H+ and the surfaces of the rocks, thereby retarding the reaction between acid and rocks, and increasing the length of acid-corroded fractures and the inhomogeneity of acid corrosion. A retarded acid formulation was developed based on the optimization acid concentration and the concentration of other additives. Evaluation of the performance of the retarded acid showed that the acid was retarded by 91.2% and the rate of corrosion was retarded by 99.6%. Reaction of the retarded acid and rocks produced clear ditches and trenches, and the flow conductivity of the ditches and trenches drops at a low magnitude as enclosure pressure is increasing, fully proving the retarding capacity of the retarded acid. This retarded acid has been successfully used in Sulige gas field, the daily gas production rate of an individual well was 5 times that of gas wells nearby.
- Adsorption /
- Retarded acid /
- Flow conductivity /
- Reservoir reformation

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