Study and application of online diversion acidizing technology in injection wells in ultra-low permeability reservoirs

被引：0
|
作者：
Deng Z. [1 ,2 ]
Zhang S. [1 ,2 ]
Song Z. [1 ,2 ]
Wang E. [1 ,2 ]
Yang Q. [3 ]
Wu W. [4 ]
机构：
[1] National Engineering Laboratory of Exporting and Development of Low-Permeability Oil/Gas Fields, Xi'an, 710018, Shaanxi
[2] Oil & Gas Technology Research Institute of Chanqing Oilfield Branch Company, PetroChina, Xi'an, 710018, Shaanxi
[3] No.10 Oil Production Plant of Changqing Oilfield Branch Company, Qingyang, 745100, Gansu
[4] Shaanxi Mingde Petroleum Technology Co., Ltd., Xi'an, 710018, Shaanxi
来源：
Oil and Gas Geology | 2019年 / 40卷 / 02期
关键词：
Chelating acid; Depressurization and injection stimulation; Diversion acidification online; Diversion agent; Ultra-low permeability reservoir;
D O I：
10.11743/ogg20190221
中图分类号：
学科分类号：
摘要：
Acidification is one of the most effective injection stimulation methods in the ultra-low permeability reservoirs. These reservoirs however, are usually characterized with poor physical property and high heterogeneity, leading to an unnecessarily long operation period, low efficiency, and insufficient effectively-operating distance for conventional acidification measures, as well as fluid fingering and secondary damage to the reservoir during the acidizing process. In this regard, we studied the Triassic ultra-low permeability reservoir in the Huanjiang oilfield, Ordos Basin, proposed the online diversion acidizing technology and developed COA-1S achelating acid system and COA-1P, a new water soluble diversion agent. After a large number of laboratory experiments, we found that, compared with the conventional acidizing method, this new technology is more retardant, compatible, water-soluble, and better at chelating and temporary blocking. In-situ pilot test has shown that the homogeneity of the water absorption profile has increased from 28.5% to 50.9%, that is, the water injectivity index doubled after the implementation of this technology. Meanwhile, its characteristics of "zero well shut-off and depressurization, zero impact on the tubing strings, and zero flow-back", allows this technology to simplify the operation process of diversion and acidification, reduce the risks in security and environment protection, and thus can be recommended as a new acidification technology for stimulating injection of wells in the ultra-low permeability reservoirs. © 2019, OIL & GAS GEOLOGY Editorial Board. All right reserved.
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页码：430 / 435
页数：5
相关论文
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