二氧化碳无水压裂增产机理研究

段永伟; 张劲

doi:10.3969/j.issn.1001-5620.2017.04.019

二氧化碳无水压裂增产机理研究

doi: 10.3969/j.issn.1001-5620.2017.04.019

段永伟¹,
张劲^2, ,

1. 吉林油田公司油气工程研究院, 吉林松原 138001;
2. 中国石油大学(北京)石油工程学院, 北京 102249

详细信息

作者简介:
段永伟,1983年生,主要从事油气藏增产改造技术的研究。电话13664387639;E-mail:duanyw@petrochina.con.cn。

通讯作者:
张劲,副教授,主要从事储层增产改造技术的研究。电话(010)89733475

中图分类号: TE357.12
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出版历程
- 收稿日期: 2016-07-05
- 刊出日期: 2017-07-31

Mechanisms of CO₂ Water-free Fracturing Method in Production Increasing

DUAN Yongwei¹,
ZHAN Jin^{2
, ,}

1. Research Institute of Oil and Gas Engineering, PetroChina Jilin Oil and Gas Field Company, Songyuan, Jilin 138001;
2. School of Petroleum Engineering, China University of Petroleum, Beijing 102249

摘要

摘要: 单井控制范围有限和地层能量补充困难一直是困扰致密油储层开发的关键问题。压裂过程井下微地震数据监测表明，二氧化碳无水压裂改造体积是同等液量常规水基压裂的2.5倍，并能显著增加裂缝的复杂程度。室内实验和压后原油取样分析证实，二氧化碳能够有效降低原油黏度，通过无水压裂施工实现了原油混相，提高了驱油效率。压后地层静压测试显示，压后地层压力较压前有显著提高，具有单井超前补充地层能量的效果。二氧化碳无水压裂技术已在吉林油田成功应用5口致密油井进行了应用，这些井压裂后产油量均较压前有显著提高，平均单井日增油量2.31 t，且施工后邻井产油、产液量均有不同程度的提高。说明了二氧化碳无水压裂增产效果良好，该技术在致密油藏开发中具有广阔的前景。
- 致密油藏 /
- 二氧化碳 /
- 无水压裂 /
- 增产机理 /
- 混相驱油
Abstract: Limited control range of a single well and insufficient formation energy supplement have long been critical problems affecting the development of tight oil reservoirs. Monitoring of downhole micro seism data during fracturing operation indicates that the volume of formation stimulated with CO₂ water-free fracturing is 2.5 times of the volume of formation stimulated with conventional hydraulic fracturing using the same volume of water as that of the CO₂ used, and the CO₂ water-free fracturing creates fractures of increased complexity. Laboratory experiment and crude oil sampling after fracturing operation have proved that CO₂ can effectively reduce the viscosity of crude oil. With the water-free fracturing, miscibility of crude oil is realized and oil displacement efficiency is enhanced. Static pressure test after fracturing shows that oil production after water-free fracturing is remarkably increased compared with the oil production before fracturing, an effect that is similar to advanced formation energy supplement of a well. CO₂ water-free fracturing technology has been successfully used on 5 oil wells with tight reservoir, remarkably increasing oil production after fracturing. Average oil production increase of 2.31 t/d per well has been gained. The CO₂ water-free fracturing also caused adjacent wells to produce more oil and more liquid, demonstrating that CO₂ water-free fracturing, a prospective technology in tight oil reservoir development, is effective in well stimulation.
- Tight oil reservoir /
- Carbon oxide /
- Water-free fracturing /
- Stimulation mechanism /
- Miscible displacement of reservoir oil

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参考文献(16)

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