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Journal of Zhejiang University SCIENCE A 2023 Vol.24 No.1 P.37-55


Effect of hydraulic fracture deformation hysteresis on CO2huff-n-puff performance in shale gas reservoirs

Author(s):  Xia YAN, Pi-yang LIU, Zhao-qin HUANG, Hai SUN, Kai ZHANG, Jun-feng WANG, Xia YAN

Affiliation(s):  School of Petroleum Engineering, China University of Petroleum (East China),, Qingdao 266580, China; more

Corresponding email(s):   RCOGFR_UPC@126.com

Key Words:  Enhanced gas recovery, CO2 huff-n-puff, Coupled geomechanics and multi-component flow, Hydraulic fracture deformation hysteresis, Embedded discrete fracture model (EDFM)

Xia YAN, Pi-yang LIU, Zhao-qin HUANG, Hai SUN, Kai ZHANG, Jun-feng WANG, Xia YAN. Effect of hydraulic fracture deformation hysteresis on CO2huff-n-puff performance in shale gas reservoirs[J]. Journal of Zhejiang University Science A, 2023, 24(1): 37-55.

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author="Xia YAN, Pi-yang LIU, Zhao-qin HUANG, Hai SUN, Kai ZHANG, Jun-feng WANG, Xia YAN",
journal="Journal of Zhejiang University Science A",
publisher="Zhejiang University Press & Springer",

%0 Journal Article
%T Effect of hydraulic fracture deformation hysteresis on CO2huff-n-puff performance in shale gas reservoirs
%A Xia YAN
%A Pi-yang LIU
%A Zhao-qin HUANG
%A Hai SUN
%A Jun-feng WANG
%A Xia YAN
%J Journal of Zhejiang University SCIENCE A
%V 24
%N 1
%P 37-55
%@ 1673-565X
%D 2023
%I Zhejiang University Press & Springer
%DOI 10.1631/jzus.A2200142

T1 - Effect of hydraulic fracture deformation hysteresis on CO2huff-n-puff performance in shale gas reservoirs
A1 - Xia YAN
A1 - Pi-yang LIU
A1 - Zhao-qin HUANG
A1 - Hai SUN
A1 - Kai ZHANG
A1 - Jun-feng WANG
A1 - Xia YAN
J0 - Journal of Zhejiang University Science A
VL - 24
IS - 1
SP - 37
EP - 55
%@ 1673-565X
Y1 - 2023
PB - Zhejiang University Press & Springer
ER -
DOI - 10.1631/jzus.A2200142

As a promising enhanced gas recovery technique, CO2 huff-n-puff has attracted great attention recently. However, hydraulic fracture deformation hysteresis is rarely considered, and its effect on CO2 huff-n-puff performance is not well understood. In this study, we present a fully coupled multi-component flow and geomechanics model for simulating CO2 huff-n-puff in shale gas reservoirs considering hydraulic fracture deformation hysteresis. Specifically, a shale gas reservoir after hydraulic fracturing is modeled using an efficient hybrid model incorporating an embedded discrete fracture model (EDFM), multiple porosity model, and single porosity model. In flow equations, Fick’s law, extended Langmuir isotherms, and the Peng-Robinson equation of state are used to describe the molecular diffusion, multi-component adsorption, and gas properties, respectively. In relation to geomechanics, a path-dependent constitutive law is applied for the hydraulic fracture deformation hysteresis. The finite volume method (FVM) and the stabilized extended finite element method (XFEM) are applied to discretize the flow and geomechanics equations, respectively. We then solve the coupled model using the fixed-stress split iterative method. Finally, we verify the presented method using several numerical examples, and apply it to investigate the effect of hydraulic fracture deformation hysteresis on CO2 huff-n-puff performance in a 3D shale gas reservoir. Numerical results show that hydraulic fracture deformation hysteresis has some negative effects on CO2 huff-n-puff performance. The effects are sensitive to the initial conductivity of hydraulic fracture, production pressure, starting time of huff-n-puff, injection pressure, and huff-n-puff cycle number.




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