页岩气藏多尺度孔缝介质压裂液微观赋存机理研究

doi:10.13809/j.cnki.cn32-1825/te.2023.05.010

Abstract

Abstract:

After hydraulic fracturing in shale gas reservoir, a significant volume of fracturing fluid retains in the matrix pores and induced fracture network. Currently, the pore scale fracturing fluid occurrence mechanisms are unclear. As a result, it is difficult to accurately understand the difference of fracturing fluid backflow rate of shale gas wells in the backflow process. In this work, the pore scale fracturing fluid occurrence mechanisms analysis method in shale multi-scale matrix-fracture system is developed and the fracturing fluid occurrence mechanisms in shale gas reservoir are elucidated in detail. To understand fracturing fluid occurrence pattern in shale matrix, singe pore gas-water occurrence method is established considering rock-fluid interaction and gas-water capillary pressure and is further extended into the pore network. Invasion percolation is applied to analyze the fracturing fluid occurrence pattern variation during different flowback stages. To understand fracturing fluid occurrence pattern in induced fracture network, the level-set gas-water interface tracking method is applied to calculate gas-water distribution at different flowback pressure based on induced fracture network CT imaging and the fracturing fluid occurrence pattern variation at different flowback stage is studied. Study results reveal that the fracturing fluid flowback rate in shale matrix first increases slowly and then increases fast. In the final stage, the fracturing fluid flowback rate in shale matrix reaches plateau. The fracturing fluid in shale matrix distributes in the forms of water saturated pores, corner water and water film. The fracturing fluid flowback rate in induced fracture network is influenced by pore connectivity around the induced fracture network. The fracturing fluid flowback rate first increases fast and then reaches plateau. The retained fracturing fluid distributes in the dead-end matrix pores around induced fracture network at the final stage.

Key words: shale gas reservoir, digital core, pore network model, fracturing fluid, flowback rate

CLC Number:

TE357

Haibang XIA,Kening HAN,Wenhui SONG, et al. Pore scale fracturing fluid occurrence mechanisms in multi-scale matrix-fracture system of shale gas reservoir[J]. Petroleum Reservoir Evaluation and Development, 2023, 13(5): 627-635.

Figures/Tables 15

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References 23

[1]	胡晓华, 张清秀, 吴建发, 等. 页岩气井压裂液返排影响因素研究[C]// 全国天然气学术年会, 中国宁夏银川, 2016: 1579-1584.
	HU Xiaohua, ZHANG Qingxiu, WU Jianfa, et al. Influential factors study of flow back of shale gas horizontal wells[C]// Institute of Petroleum and Gas Professional Committee of China, Sichuan Petroleum Institute. 2016 National Natural Gas Academic Annual Conference, Yinchuan, 2016: 1579-1584.
[2]	卢拥军, 王海燕, 管保山, 等. 海相页岩压裂液低返排率成因[J]. 天然气工业, 2017, 37(7): 46-51.
	LU Yongjun, WANG Haiyan, GUAN Baoshan, et al. Reasons for the low flowback rates of fracturing fluids in marine shale[J]. Natural Gas Industry, 2017, 37(7): 46-51.
[3]	樊欣欣, 任晓娟. 致密气藏压裂液伤害特征及实验影响因素分析[J]. 石油化工应用, 2017, 36(4): 24-27.
	FAN Xinxin, REN Xiaojuan. Damage characteristics of fracturing fluid in tight gas reservoir and analysis of experimental factors[J]. Petrochemical Industry Application, 2017, 36(4): 24-27.
[4]	游利军, 王飞, 康毅力, 等. 页岩气藏水相损害评价与尺度性[J]. 天然气地球科学, 2016, 27(11): 2023-2029.
	YOU Lijun, WANG Fei, KANG Yili, et al. Evaluation and scale effect of aqeous phase damage in shale gas reservoir[J]. Natural Gas Geoscience, 2016, 27(11): 2023-2029.
[5]	司志梅, 李爱芬, 郭海萱, 等. 致密油藏压裂液滤液返排率影响因素室内实验[J]. 油气地质与采收率, 2017, 24(1): 122-126.
	SI Zhimei, LI Aifen, GUO Haixuan, et al. Experimental study on the influencing factors of fracturing fluid flowback rate in tight reservoir[J]. Petroleum Geology and Recovery Efficiency, 2017, 24(1): 122-126.
[6]	GE H K, YANG L, SHEN Y H, et al. Experimental investigation of shale imbibition capacity and the factors influencing loss of hydraulic fracturing fluids[J]. Petroleum Science, 2015, 12(4): 636-650. doi: 10.1007/s12182-015-0049-2
[7]	HUN L, BING Y, SONG X X, et al. Fracturing fluid retention in shale gas reservoir from the perspective of pore size based on nuclear magnetic resonance[J]. Journal of Hydrology, 2021, 601: 126590. doi: 10.1016/j.jhydrol.2021.126590
[8]	ZHANG Y, LI Z P, LAI F P, et al. Experimental investigation into the effects of fracturing fluid-shale interaction on pore structure and wettability[J]. Geofluids, 2021, 2021: 6637955.
[9]	张磊, 康钦军, 姚军, 等. 页岩压裂中压裂液返排率低的孔隙尺度模拟与解释[J]. 科学通报, 2014, 59(32): 3197-3203.
	ZHANG Lei, KANG Qinjun, YAO Jun, et al. The explanation of low recovery of fracturing fluid in shale hydraulic fracturing by pore-scale simulation[J]. Chinese Science Bulletin, 2014, 59(32): 3197-3203.
[10]	SONG W H, LIU L J, WANG D Y, et al. Nanoscale confined multicomponent hydrocarbon thermodynamic phase behavior and multiphase transport ability in nanoporous material[J]. Chemical Engineering Journal, 2020, 382: 122974. doi: 10.1016/j.cej.2019.122974
[11]	YAO J, SONG W H, WANG D Y, et al. Multi-scale pore network modelling of fluid mass transfer in nano-micro porous media[J]. International Journal of Heat and Mass Transfer, 2019, 141: 156-167. doi: 10.1016/j.ijheatmasstransfer.2019.06.077
[12]	SONG W H, YIN Y, LANDRY C J, et al. A local-effective-viscosity multi-relaxation-time lattice Boltzmann-pore network coupling model to predict gas transport property in complex nanoporous media[J]. SPE Journal, 2020, 26(1): 461-481. doi: 10.2118/203841-PA
[13]	ISRAELACHVILI J N. Intermolecular and surface forces[M]. 3rd ed. Waltham: Academic Press, 2011.
[14]	BERG J C. An introduction to interfaces & colloids: The bridge to nanoscience[M]. Singapore: World Scientific, 2010.
[15]	HEATH J E, BRYAN C R, MATTEO E N, et al. Adsorption and capillary condensation in porous media as a function of the chemical potential of water in carbon dioxide[J]. Water Resources Research, 2014, 50(3): 2718-2731. doi: 10.1002/wrcr.v50.3
[16]	TOKUNAGA T K. DLVO-based estimates of adsorbed water film thicknesses in geologic CO₂ reservoirs[J]. Langmuir, 2012, 28(21): 8001-8009. doi: 10.1021/la2044587
[17]	BASHKATOV A N, GENINA E A. Water refractive index in dependence on temperature and wavelength: A simple approximation[A]. Proceedings of the Saratov Fall Meeting 2002: Optical Technologies in Biophysics and Medicine IV[C]. International Society for Optics and Photonics, 2003: 393-395.
[18]	GREGORY J. Interaction of unequal double layers at constant charge[J]. Journal of Colloid and Interface Science, 1975, 51(1): 44-51. doi: 10.1016/0021-9797(75)90081-8
[19]	CHURAEV N, DERJAGUIN B. Inclusion of structural forces in the theory of stability of colloids and films[J]. Journal of Colloid and Interface Science, 1985, 103(2): 542-553. doi: 10.1016/0021-9797(85)90129-8
[20]	VALVATNE P H, BLUNT M J. Predictive pore-scale modeling of two-phase flow in mixed wet media[J]. Water Resources Research, 2004, 40(7): W07406.
[21]	PRODANOVIĆ M, BRYANT S L. A level set method for determining critical curvatures for drainage and imbibition[J]. Journal of Colloid and Interface Science, 2006, 304(2): 442-458. pmid: 17027812
[22]	OSHER S, FEDKIW R P. Level set methods and dynamic implicit surfaces[M]. New York: Springer New York, 2005.
[23]	PENG D P, MERRIMAN B, OSHER S, et al. A PDE-based fast local level set method[J]. Journal of Computational Physics, 1999, 155(2): 410-438. doi: 10.1006/jcph.1999.6345

序号	物理尺寸	平均孔隙半径/nm	平均配位数
1号	10 μm×10 μm×10 μm	52.00	3.15
2号	2.96 μm×2.96 μm×2.96 μm	16.30	3.44
3号	3.01 μm×3.01 μm×3.01 μm	17.60	3.07
4号	1.46 μm×1.46 μm×1.46 μm	8.58	2.82
5号	5.97 μm×5.97 μm×5.97 μm	23.60	2.70

Pore scale fracturing fluid occurrence mechanisms in multi-scale matrix-fracture system of shale gas reservoir

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