Movement characteristics of coal powders at bottom of coalbed methane well under jet flow

IF 3.5 3区工程技术 Q3 ENERGY & FUELS

Energy Science & Engineering Pub Date : 2024-08-05 DOI:10.1002/ese3.1843

Fen-na Zhang, Li-kun Xue, Bin Wang, Chuan-kai Jing, Jia Li, Hao Hu, Xin-ning Ma

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Abstract

The removal and discharge of coal powders from coalbed methane wellbore is the key to maintaining continuous production. For this reason, based on the submerged jet theory, the force and migration starting conditions of coal powder particles deposited at the bottom of the coalbed methane well are analyzed by analyzing the cohesiveness of coal powders, and a model for the starting and migration of coal powders at the bottom of the well under submerged jet conditions is established; Considering the adhesion between coal dust, the adhesion coefficient is used to characterize the adhesion between particles, a mechanical model of coal dust particles deposited at the bottom of the well is established, and the corresponding calculation formula for the outlet flow rate of the coal dust cleaning nozzle is derived. The fluid mechanics parameters of the bottom of the well coal dust cleaning under different conditions are obtained, and the numerical simulation method is used to simulate the whole process of jet flushing of the bottom of the well coal dust deposited, and the effect of the bottom of the well jet flushing of coal dust deposits is analyzed, providing a theoretical basis for the bottom of the well coal dust flushing process.

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煤层气井底煤粉在射流作用下的运动特性

煤层气井筒中煤粉的清除和排放是保持连续生产的关键。为此，以水下射流理论为基础，通过分析煤粉的粘聚性，分析了煤粉颗粒沉积在煤层气井底的受力和迁移起始条件，建立了水下射流条件下煤粉在井底的起始和迁移模型；考虑到煤粉之间的粘附性，采用粘附系数表征颗粒之间的粘附性，建立了煤粉颗粒在井底沉积的力学模型，并推导出相应的煤粉清灰喷嘴出口流量计算公式。得到了不同条件下井底煤尘净化的流体力学参数，并采用数值模拟方法模拟了井底煤尘沉积喷射冲洗的全过程，分析了井底煤尘沉积喷射冲洗的效果，为井底煤尘冲洗过程提供了理论依据。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Energy Science & Engineering Engineering-Safety, Risk, Reliability and Quality

CiteScore

6.80

自引率

7.90%

发文量

298

审稿时长

11 weeks

期刊介绍： Energy Science & Engineering is a peer reviewed, open access journal dedicated to fundamental and applied research on energy and supply and use. Published as a co-operative venture of Wiley and SCI (Society of Chemical Industry), the journal offers authors a fast route to publication and the ability to share their research with the widest possible audience of scientists, professionals and other interested people across the globe. Securing an affordable and low carbon energy supply is a critical challenge of the 21st century and the solutions will require collaboration between scientists and engineers worldwide. This new journal aims to facilitate collaboration and spark innovation in energy research and development. Due to the importance of this topic to society and economic development the journal will give priority to quality research papers that are accessible to a broad readership and discuss sustainable, state-of-the art approaches to shaping the future of energy. This multidisciplinary journal will appeal to all researchers and professionals working in any area of energy in academia, industry or government, including scientists, engineers, consultants, policy-makers, government officials, economists and corporate organisations.