超低渗油藏在线分流酸化增注技术研究与应用

doi:10.11743/ogg20190221

石油与天然气地质 ›› 2019, Vol. 40 ›› Issue (2): 430-435.doi: 10.11743/ogg20190221

超低渗油藏在线分流酸化增注技术研究与应用

邓志颖^1,2, 张随望^1,2, 宋昭杰^1,2, 王尔珍^1,2, 杨乾隆³, 吴文超⁴

1. 低渗透油气田勘探开发国家工程实验室, 陕西西安 710018;
2. 中国石油长庆油田分公司油气工艺研究院, 陕西西安 710018;
3. 中国石油长庆油田分公司第十采油厂, 甘肃庆阳 745100;
4. 陕西明德石油科技有限公司, 陕西西安 710018

收稿日期:2018-03-12 修回日期:2018-12-02 出版日期:2019-04-28 发布日期:2019-01-23
第一作者简介:邓志颖(1987-),女,硕士研究生、工程师,油田注水工艺。E-mail:dengzy1_cq@petrochina.com.cn。
基金项目:
国家科技重大专项（2016ZX05023-005）。

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

Deng Zhiying^1,2, Zhang Suiwang^1,2, Song Zhaojie^1,2, Wang Erzhen^1,2, Yang Qianlong³, Wu Wenchao⁴

1. National Engineering Laboratory of Exporting and Development of Low-Permeability Oil/Gas Fields, Xi'an, Shannxi 710018, China;
2. Oil & Gas Technology Research Institute of Chanqing Oilfield Branch Company, PetroChina, Xi'an, Shannxi 710018, China;
3. No. 10 Oil Production Plant of Changqing Oilfield Branch Company, Qingyang, Gansu 745100, China;
4. Shaanxi Mingde Petroleum Technology Co., Ltd., Xi'an, Shaanxi 710018, China

Received:2018-03-12 Revised:2018-12-02 Online:2019-04-28 Published:2019-01-23

摘要/Abstract

摘要： 酸化是超低渗油藏最有效的增注措施之一，但由于储层物性差、非均质性强等问题，造成目前常规酸化措施普遍具有施工周期长、有效率低、有效作用距离短等不足，且酸化过程中存在指进现象和储层二次伤害。针对这一问题，选取鄂尔多斯盆地环江油田三叠系超低渗油藏为研究对象，提出了在线分流酸化技术，并配套研制了一种多元缓速螯合酸COA-1S和一种新型的水溶性分流剂COA-1P。通过室内评价实验和在线分流酸化模拟实验，发现该技术在缓速性、配伍性、水溶性、螯合能力和暂堵功能等方面均显著优于常规酸化；现场先导性实验结果表明，酸化后剖面吸水均匀程度从28.5%上升至50.9%，视吸水指数增加2倍左右，降压增注效果显著；同时，该技术还具有“不停井、不泄压、不动管柱、不返排”的特点，简化了常规分流酸化工序、降低了安全环保风险，是一种能够很好地适应超低渗油藏特征的酸化增注技术。

关键词: 螯合酸, 分流剂, 降压增注, 超低渗油藏, 在线分流酸化

Abstract: 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.

Key words: chelating acid, diversion agent, depressurization and injection stimulation, ultra-low permeability reservoir, diversion acidification online

中图分类号:

TE357

邓志颖,张随望,宋昭杰,等. 超低渗油藏在线分流酸化增注技术研究与应用[J]. 石油与天然气地质, 2019, 40(2): 430-435. doi: 10.11743/ogg20190221 Deng Zhiying,Zhang Suiwang,Song Zhaojie,et al. Study and application of online diversion acidizing technology in injection wells in ultra-low permeability reservoirs[J]. Oil & Gas Geology, 2019, 40(2): 430-435. doi: 10.11743/ogg20190221

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超低渗油藏在线分流酸化增注技术研究与应用

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

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