复杂人工裂缝产状页岩气藏多段压裂水平井产能评价

doi:10.13809/j.cnki.cn32-1825/te.2023.04.007

Abstract

Abstract:

Considering complex shape and non-uniform distribution of fracturing fractures in shale reservoir, on the basis of multiple migration mechanisms a unified apparent permeability model is developed, incorporating two types of pore apparent permeability based on multiple migration mechanisms. This model serves as the foundation for establishing a gas reservoir-fracture-wellbore coupled seepage model, utilizing real space source function theory and pressure drawdown superposition principle. Through simulations and analyses, the study investigates the effects of micro seepage, fracture shape and non-uniform distribution of fractures on shale gas productivity. The demonstrate that micro seepage significantly impacts shale gas well production, with daily gas production being 20.3 % higher when considering micro seepage during the initial stage compared to neglecting it. Furthermore, the productivity of wells with complex fractures is lower than that of wells with ideal rectangular fractures, and star-shaped fractures exhibit the lowest productivity. The non-uniform distribution of fractures also affects the productivity of horizontal wells, and an optimal fracture layout is identified. The model takes into account both the micro seepage mechanism and actual fracturing fracture of shale gas, providing valuable guidance for the productivity research of fractured horizontal wells in shale gas reservoir.

Key words: shale gas, apparent permeability, fractured horizontal well, complex fracture, productivity model

CLC Number:

TE328

HU Zhijian, LI Shuxin, WANG Jianjun, ZHOU Hong, ZHAO Yulong, ZHANG Liehui. Productivity evaluation of multi-stage fracturing horizontal wells in shale gas reservoir with complex artificial fracture occurrence[J].Petroleum Reservoir Evaluation and Development, 2023, 13(4): 459-466.

Figures/Tables 12

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References 25

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参数	取值	参数	取值
井底流压/MPa	6	气藏长度/m	1 950
裂缝数量	7	气藏宽度/m	1 100
裂缝半长/m	150	气藏厚度/m	50
裂缝宽度/m	0.005	基质渗透率/10^-3 μm²	1×10^-5
裂缝高度/m	50	基质孔隙度	0.05
裂缝间距/m	200	气藏温度/K	353
裂缝导流能力/（10^-3 μm²·m）	0.2	原始地层压力/MPa	30

参数	取值	参数	取值
气藏长度/m	2 000	气藏温度/K	377
气藏宽度/m	500	原始地层压力/MPa	36
气藏厚度/m	30	井底流压/MPa	10
基质孔隙度	0.061	Langmuir压力/MPa	4.5
有机质占比	0.055	Langmuir体积/（m³/kg）	2.7×10^-3
综合压缩系数/MPa^-1	0.024	裂缝导流能力/ （10^-3 μm²·m）	0.15

Productivity evaluation of multi-stage fracturing horizontal wells in shale gas reservoir with complex artificial fracture occurrence

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