The Numerical Stimulation of Methane-Air Mixing Characteristics in Wellbore during the Air Jet Injection

Author:

Tao Zhixiang12ORCID,Cai Chengzheng12ORCID,Zou Zengxin12,Yang Yugui12,Feng Yinrong12

Affiliation:

1. State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Xuzhou 221116, China

2. School of Mechanics and Civil Engineering, China University of Mining and Technology, Xuzhou 221116, China

Abstract

At present, in situ blasting fracturing with formation methane is identified as an effective method for shale gas stimulation. In this paper, based on the in situ temperature and pressure conditions, a horizontal wellbore model filled with methane was established to simulate the methane-air mixing characteristics in wellbore during air jet. According to the distributions of the methane concentration and flow field characteristics, methane-air mixing inside the wellbore can be divided into three types: free diffusion mixing, turbulent pulsating mixing, and regenerated vortex mixing. Due to the limitation of fixed jet, the methane concentration beyond the jetting region changed little. In addition, the moving jet was used to realize the mixing of methane and oxidizer in wellbore. The sensitivity of different parameters to the distribution of the methane concentration in wellbore was discussed. The results showed that the methane concentration was more sensitive to the wellbore diameter and nozzle diameter. The moving velocity of nozzle was closely related to the distribution uniformity of the methane concentration in wellbore. The moving velocity of nozzle was selected as a single influence parameter to adjust the uniformity of methane distribution in the wellbore, to ensure that methane concentration was within the explosion limit.

Funder

China University of Mining and Technology

Publisher

Hindawi Limited

Subject

General Earth and Planetary Sciences

Reference27 articles.

1. Hydraulic fracture design optimization in unconventional reservoirs - a case history;T. T. Palisch

2. Fracture propagation direction and its application in hydraulic fracturing;X. Jin,2013

3. Reservoir characteristics of shale gas in Longmaxi Formation of the Lower Silurian, southern Sichuan;W. Y. Jianzhong;Acta Petrolei Sinica.,2012

4. Managing environmental and social risks in China;P. Touzel

5. High-energy gas fracturing technique to exploit natural gas hydrate reservoir;D. Zhu;Journal of Chongqing University of Science and Technology,2009

同舟云学术

1.学者识别学者识别

2.学术分析学术分析

3.人才评估人才评估

"同舟云学术"是以全球学者为主线,采集、加工和组织学术论文而形成的新型学术文献查询和分析系统,可以对全球学者进行文献检索和人才价值评估。用户可以通过关注某些学科领域的顶尖人物而持续追踪该领域的学科进展和研究前沿。经过近期的数据扩容,当前同舟云学术共收录了国内外主流学术期刊6万余种,收集的期刊论文及会议论文总量共计约1.5亿篇,并以每天添加12000余篇中外论文的速度递增。我们也可以为用户提供个性化、定制化的学者数据。欢迎来电咨询!咨询电话:010-8811{复制后删除}0370

www.globalauthorid.com

TOP

Copyright © 2019-2024 北京同舟云网络信息技术有限公司
京公网安备11010802033243号  京ICP备18003416号-3