Study on pulverized coal settlement model modification and migration experiment in coalbed methane wells

WANG YIBING; ZHANG FEI; LAI PENG; LIAO ZHENGKAI; MEI WENBO; YANG QI; LI GUICHUAN; ZHANG JINTAO; XIAN BAO’AN; BI YANSEN

doi:10.13809/j.cnki.cn32-1825/te.2025009

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Study on pulverized coal settlement model modification and migration experiment in coalbed methane wells
Vol. 16, Issue 2, Pages: 404-413(2026)
Received：06 January 2025，

Published：26 March 2026
DOI： 10.13809/j.cnki.cn32-1825/te.2025009
稿件说明：

移动端阅览

王一兵, 张飞, 来鹏, 等. 煤层气井煤粉沉降模型修正与运移实验研究[J]. 油气藏评价与开发, 2026, 16(2): 404-413. DOI： 10.13809/j.cnki.cn32-1825/te.2025009.

WANG Yibing, ZHANG Fei, LAI Peng, et al. Study on pulverized coal settlement model modification and migration experiment in coalbed methane wells[J]. Petroleum Reservoir Evaluation and Development, 2026, 16(2): 404-413. DOI： 10.13809/j.cnki.cn32-1825/te.2025009.

摘要

煤层气采用排采泵排水降压方式开发时，煤粉产出与运移是影响煤层气井生产特征的重要因素。由于煤层非均质性、储层改造与排采制度等影响，煤层气井各生产阶段煤粉产出与运移特征各不相同。基于沁水盆地潘庄、寿阳和柿庄等区块煤层气井煤粉采集分析，揭示排采产出煤粉形态、质量浓度和成分特征。为研究煤粉颗粒形状因子对静态沉降末速影响，根据煤层气井产出煤粉颗粒粒径分布特征，引入煤粉形状因子表征参数对煤粉颗粒静态沉降末速计算模型进行修正，并通过室内实验进行验证分析。同时，根据室内模拟井筒煤粉运移实验结果探明煤粉颗粒运移临界流速，分析评价了不同粒径煤粉运移临界排量。研究表明：煤层气井产出煤粉主要成分为黏土矿物（平均质量分数为74.4 %），煤粉粒径随着煤层气生产阶段呈现先增大后减小规律，集中分布在2~50 μm；将煤粉形状因子引入颗粒静态沉降末速模型后计算值与实验结果高度吻合（相关系数

=99%），提高了井筒煤粉临界运移流速计算精度；结合潘河、柿庄等研究区煤层气井生产制度与室内模拟井筒煤粉运移实验，提出了

180~250、

150~180、38~380 μm煤粉颗粒临界运移流速分别为0.020、0.010、0.035 m/s，对应的最小产水量分别为5.2、2.6、8.5 m

/d；单井日产水量大于最小产水量可减少井筒煤粉堆积和卡泵风险，为煤层气井生产制度优化及连续稳定生产提供技术支持。

Abstract

Coalbed methane (CBM) is developed through pump drainage and depressurization. The production and migration of pulverized coal are important factors affecting the production characteristics of CBM wells. Due to the influence of coal heterogeneity

reservoir stimulation

and drainage system

the characteristics of pulverized coal production and migration vary across different production stages of CBM wells. Based on the collection and analysis of pulverized coal from CBM wells in the Panzhuang

Shouyang

and Shizhuang blocks of the Qinshui Basin

the morphology

concentration

and composition characteristics of pulverized coal produced during drainage were revealed. To investigate the influence of the shape factor of pulverized coal particles on the static settling final velocity

the characterization parameters of the pulverized coal shape factor were introduced to modify the calculation model for static settling final velocity based on the particle size distribution characteristics of pulverized coal produced from CBM wells. The modified model was then validated and analyzed through laboratory experiments. Additionally

based on the results of laboratory simulation experiments o

f pulverized coal migration in wellbores

the critical flow velocity for particle migration was determined

and the critical discharge rate for the migration of pulverized coal of different particle sizes was analyzed and evaluated. The results showed that the main components of pulverized coal from CBM wells were clay minerals

with an average mass fraction of 74.4%. The particle size of pulverized coal was concentrated in the range of 2~50 μm. The particle size of the pulverized coal first increased and then decreased in the CBM production stage. The calculated results were in good agreement with the experimental results (

² = 0.99) by introducing the pulverized coal shape factor into the particle static settling final velocity model

thereby improving the accuracy of critical migration velocity calculation of pulverized coal in the wellbore. Based on the production systems of CBM wells in the Panhe and Shizhuang study areas and laboratory simulated wellbore pulverized coal migration experiments

the critical migration velocities for pulverized coal particles of

180~250

150~180

and 38~380 μm were 0.020 m/s

0.010 m/s

and 0.035 m/s

respectively. The corresponding minimum water production rates were 5.2 m

2.6 m

and 8.5 m

respectively. A daily water production of a single well exceeding the minimum water production can reduce the risk of pulverized coal accumulation and pump sticking within the wellbore

providing technical support for optimizing production systems and achieving continuous and stable production of CBM wells.

关键词

Keywords

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