A new coal reservoir permeability model considering the influence of pulverized coal blockage and its application

被引：0

作者：

Shi J. ^{[1
,2
]}

Wu J. ^{[1
,2
]}

Fang Y. ^{[1
,2
]}

Lu J. ^{[1
,2
]}

Hou C. ^{[3
]}

Li X. ^{[1
,2
]}

Zhang S. ^{[1
,2
]}

Xiong X. ^{[4
]}

机构：

[1] Coalbed Methane Research Center, China University of Petroleum, Beijing

[2] State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing

[3] CNOOC Gas & Power Group, Beijing

[4] PetroChina Coalbed Methane Co., Ltd., Beijing

来源：

Natural Gas Industry | 2020年 / 40卷 / 06期

关键词：

Baode Block; Qinshui Basin; Coalbed methane; Dynamic permeability; Flow velocity sensitivity; Hancheng Block; Huanglong Coalfield; Liulin Block; Productivity prediction; Pulverized coal;

D O I：

10.3787/j.issn.1000-0976.2020.06.008

中图分类号：

学科分类号：

摘要：

In order to accurately predict the production performance of coalbed methane (CBM) wells and to formulate a reasonable production system, this paper established a coal reservoir permeability model considering the influence of pulverized coal blockage. Then, on the basis of this model, the flow velocity sensitivity (FVS) experimental data of 15 groups of coal samples taken from the Baode Block, Qinshui Basin, Liulin Block, Hancheng Block and the Huanglong Coalfield were fitted to determine the permeability models for different coal samples. On this basis, this newly established permeability model was incorporated into a previously developed CBM well performance analysis software, and production history matching was carried out on two CBM wells. Finally, the effects of the parameters of pulverized coal blockage on the permeability of coal reservoirs and the production performance of CBM wells were studied by taking the fitting parameters of CBM Well W1 as the reference. And the following research results are obtained. First, this new model considering the influence of pulverized coal blockage can quantitatively describe the variation of coal reservoir permeability with fluid velocity. In addition, this model can be incorporated into a CBM numerical simulation software or a CBM well performance analysis software to apply it in a wide range. Second, the coal reservoir permeability is less affected by pulverized coal blockage in the Baode Block, but this effect shall not be ignored in the Qinshui Basin and the Huanglong Coalfield. Third, the greater the theoretical maximum permeability damage degree (Dmax) and the permeability damage degree index (n) are, the lower the relative flow velocity (v0.5) corresponding to the critical flow velocity of pulverized coal blockage is and the more obvious the effect of pulverized coal blockage on coal reservoir permeability. Fourth, in order to reduce the adverse effect of pulverized coal blockage on coal reservoir permeability, it is suggested to reduce the production pressure difference appropriately in the process of production, especially in the initial stage of gas production, so as to avoid severe damage to coal reservoir permeability. © 2020, Natural Gas Industry Journal Agency. All right reserved.

引用

页码：78 / 89

页数：11

共 47 条

[1]

SOMERTON W H, SOYLEMEZOGLU I M, DUDLEY R C., Effect of stress on permeability of coal, International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts, 12, 5, pp. 129-145, (1975)

[2]

MENG Zhaoping, HOU Quanlin, Coupling model of stress-dependent permeability in high-rank coal reservoir and its control mechanism, Chinese Journal of Geophysics, 56, 2, pp. 667-675, (2013)

[3]

LI Xiangchen, KANG Yili, LUO Pingya, Rock deformation mechanisms and its influence on percolation ability for CBM reservoirs, China Mining Magazine, 18, 3, pp. 99-102, (2009)

[4]

YUAN Zhe, LIU Pengcheng, Research on effect of effective stress and gas slippage on permeability of coal, Coal Technology, 35, 7, pp. 174-175, (2016)

[5]

GRAY I., Reservoir engineering in coal seams: Part 1-The physical process of gas storage and movement in coal seams, SPE Reservoir Engineering, 2, 1, pp. 28-34, (1987)

[6]

FU Xuehai, LI Dahua, QIN Yong, Et al., Experimental research of influence of coal matrix shrinkage on permeability, Journal of China University of Mining & Technology, 31, 2, pp. 129-131, (2002)

[7]

KLINKENBERG L J., The permeability of porous media to liquid and gases, Drilling and Production Practice, (1941)

[8]

XIAO Xiaochun, PAN Yishan, Experimental study of gas transfusion with slippage effects in hypotonic coal reservoir, Chinese Journal of Geotechnical Engineering, 31, 10, pp. 1554-1558, (2009)

[9]

XIA Peng, ZENG Fangui, WU Jing, Et al., Division of different drainage and production stages of medium-rank coalbed methane wells and the change in permeability, Journal of Southwest Petroleum University (Science & Technology Edition), 40, 6, pp. 115-123, (2018)

[10]

CHEN Zhenhong, WANG Yibing, SUN Ping, Destructive influences and effectively treatments of coal powder to high rank coalbed methane production, Journal of China Coal Society, 34, 2, pp. 229-232, (2009)

← 1 2 3 4 5 →