注入气体提高砂岩储层酸化效果

刘义刚; 张璐; 张丽平; 邹剑; 张云鹏; 高尚

doi:10.3969/j.issn.1001-5620.2017.04.022

注入气体提高砂岩储层酸化效果

doi: 10.3969/j.issn.1001-5620.2017.04.022

1. 中海石油(中国)有限公司天津分公司渤海石油研究院, 天津 300459;
2. 中海油能源发展股份有限公司工程技术分公司, 天津 300452

基金项目:

国家重大专项课题“渤海油田高效采油工程及配套技术示范”（2016ZX05058003）。

详细信息

作者简介:
刘义刚,1969年生,博士,高级工程师,现主要从事于海上油田采油工程相关技术研究。E-mail:liuyg@cnooc.com.cn。

中图分类号: TE357.2
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出版历程
- 收稿日期: 2017-04-05
- 刊出日期: 2017-07-31

Injected Gas Improves Acidification Job Quality of Sandstone Reservoirs

1. Bohai Research Institute of Petroleum, Tianjin Branch of CNOOC, Tianjin 300459;
2. CNOOC EnerTech-Drilling & Production Co., Tianjin 300452

摘要

摘要: 针对常规酸化作业逐渐暴露出酸化效果差、有效期短、解堵范围有限等问题，充分考虑砂岩储层气井酸化效果普遍好于油井的现场经验，提出了油井酸化过程中通过注入气体以提高酸化效果的设计思路。研究过程中分析了气液交替注入酸化解堵工艺的作用机理及优势，通过室内实验进一步探索3种不同注气模式下，对未伤害及受钻完井液伤害岩心的酸化改善效果，并对比分析了注入不同气体对酸化效果的影响。研究认为，酸化过程中注入气体能明显提高被污染岩心的酸化效果，尤其采用前置气+气液交替注入的酸化模式，而对未受污染岩心注入气体改善酸化效果不明显，且总体上注CO₂气体酸化效果要好于注N₂。气液交替注入酸化工艺现场实验解堵效果显著，能够有效地提高常规酸化效果。
- 酸化 /
- 注入前置气 /
- 气液交替注入 /
- 污染岩心 /
- 未污染岩心
Abstract: It has been noticed in well acidification operation that the acidification job quality is not satisfactory, the effective period of the acidification job is short, and the acidified area is limited. In well acidification operations, it has been found that the results of acidifying a gas well penetrating sandstone reservoirs are much better than the results of acidifying an oil well penetrating sandstone reservoirs. This observation has been used in designing oil well acidification program to improve the acidification job quality, that is, a gas can be injected with acid into the well in oil well acidification. The mechanisms and advantages of alternated injection of gas and acid are extensively studied in this paper. In laboratory experiment, the acidification results of undamaged cores and cores damaged by completion fluid under 3 gas injection models were studied, and the effects of different injected gases on the acidification results were analyzed. It is considered that gas injected in well acidification clearly improved the acidification job quality of damaged cores, especially when an acidification mode in which prepad gas plus alternated gas and acid injections was used during well acidification. For undamaged cores, the effectiveness of gas injection with acid in well acidification was not satisfactory. It was also found that the effectiveness of injecting CO₂ was better than that of injecting N₂. Alternated gas injection with acid in well acidification greatly improves the permeability of the reservoir rocks, and is able to enhance the effectiveness of conventional well acidification job. This technology has a broad development prospect.
- Acidification /
- Injected prepad gas /
- Alternated gas and acid injection /
- Damaged core /
- Undamaged core

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参考文献(9)

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