保德区块煤粉产出特征及其影响要素剖析

doi:10.13809/j.cnki.cn32-1825/te.2023.04.005

Abstract

Abstract:

The issue of coal fine production is increasingly prominent in the development of coal-bed methane. Implementing appropriate measures to control the migration and production of coal fines is crucial for achieving stable and high production of coal-bed methane wells. However, the characteristics of coal migration and production in the coal seams of Baode block remain unclear, which hinders the efficient development of coal-bed methane in some wells in this area. To address the problem of coal fine production in coal-bed methane development, core flooding experiments were conducted to investigate the migration and production characteristics of coal fines concerning influencing factors such as formation water velocity, salinity, gas-water ratio, effective stress, etc. The experimental results revealed that during the drainage stage, the amount of coal fines produced at low formation water flow is minimal, with coal fines moving within fractures and accumulating at the outlet, forming a coal powder filter cake. However, when formation water flow surpasses the critical flow, a significant amount of coal fines is produced. A substantial pressure fluctuation can flush out the coal fines obstructing the outlet. Furthermore, the salinity of the formation water plays a role in carrying coal powder, with higher salinity increasing its transport capacity. While single gas phase flow is not effective in displacing the coal fine migration and production, two-phase flow with a gas-water ratio of 50∶50 exhibits a stronger ability to carry coal powder. The concentration of coal fine in the produced liquid continued to decline with the increase of the effective stress loaded on the coal, Similarly, the holding pressure at the outlet follows a downward trend, but the displacement pressure difference increases. The research findings provide essential data and a theoretical basis for implementing on-site prevention and control of coal fine production.

Key words: Baode block, coal fine, production characteristics, flow velocity, gas-water ratio, effective stress

CLC Number:

TE37

MENG Wenhui, ZHANG Wen, WANG Boyang, HAO Shuai, WANG Zebin, PAN Wujie. Analysis of characteristics of coal fine production and its influence factors in Baode block[J].Petroleum Reservoir Evaluation and Development, 2023, 13(4): 441-450.

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温度/℃	支撑剂目数	矿化度/（mg/L）	流速/（mL/min）
40	20~40	1 000	5 10 20 30 40
40	20~40	1 000	10
		3 000
		5 000
		8 000

温度/℃	支撑剂目数	气水比	流速/（mL/min）
40	20~40	0∶100 20∶80 50∶50 80∶20 100∶0	10
40	20~40	0∶100 20∶80 50∶50 80∶20 100∶0	20

Analysis of characteristics of coal fine production and its influence factors in Baode block

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