A Semianalytical Method for Modeling Two-Phase Flow in Coalbed-Methane Reservoirs With Complex Fracture Networks

2018 ◽  
Vol 21 (03) ◽  
pp. 719-732 ◽  
Author(s):  
Ruiyue Yang ◽  
Zhongwei Huang ◽  
Wei Yu ◽  
Hamid Lashgari ◽  
Kamy Sepehrnoori
Keyword(s):  
Coalbed Methane ◽  
Two Phase Flow ◽  
Phase Flow ◽  
Fracture Networks ◽  
Two Phase ◽  
Complex Fracture ◽  
Semianalytical Method

scholarly journals A semi-analytical two-phase flow model of fractured horizontal well with complex fracture networks in natural fractured reservoirs

2021 ◽  
pp. 014459872110417
Author(s):  
Mengmeng Li ◽  
Gang Bi ◽  
Yu Shi ◽  
Kai Zhao
Keyword(s):  
Two Phase Flow ◽  
Fractured Reservoirs ◽  
Flow Regimes ◽  
Dual Porosity ◽  
Phase Flow ◽  
Fracture Networks ◽  
Two Phase ◽  
Secondary Fracture ◽  
Complex Fracture ◽  
Main Fracture

Complex fracture networks are easily developed along the horizontal wellbore during hydraulic fracturing. The water phase increases the seepage resistance of oil in natural fractured reservoir. The flow regimes become more intricate due to the complex fractures and the occurrence of two-phase flow. Therefore, a semi-analytical two-phase flow model is developed based on the assumption of orthogonal fracture networks to describe the complicate flow regimes. The natural micro-fractures are treated as a dual-porosity system and the hydraulic fracture with complex fracture networks are characterized explicitly by discretizing the fracture networks into multiple fracture segments. The model is solved according to Laplace transformation and Duhamel superposition principle. Results show that seven possible flow regimes are described according to the typical curves. The major difference between the vertical fractures and the fracture networks along the horizontal wellbore is the fluid “feed flow” behavior from the secondary fracture to the main fracture. A natural fracture pseudo-radial flow stage is added in the proposed model comparing with the conventional dual-porosity model. The water content has a major effect on the fluid total mobility and flow capacity in dual-porosity system and complex fracture networks. With the increase of the main fracture number, the interference of the fractures increases and the linear flow characteristics in the fracture become more obvious. The secondary fracture number has major influence on the fluid feed capacity from the secondary fracture to the main fracture. The elastic storativity ratio mainly influences the fracture flow period and inter-porosity flow period in the dual-porosity system. The inter-porosity flow coefficient corresponds to the inter-porosity flow period of the pressure curves. This work is significantly important for the hydraulic fracture characterization and performance prediction of the fractured horizontal well with complex fracture networks in natural fractured reservoirs.

Massive fines detachment induced by moving gas-water interfaces during early stage two-phase flow in coalbed methane reservoirs

Fuel ◽  
2018 ◽  
Vol 222 ◽  
pp. 193-206 ◽  
Author(s):  
Fansheng Huang ◽  
Yili Kang ◽  
Lijun You ◽  
Xiangchen Li ◽  
Zhenjiang You
Keyword(s):  
Coalbed Methane ◽  
Two Phase Flow ◽  
Early Stage ◽  
Phase Flow ◽  
Two Phase

scholarly journals A fully coupled thermal-hydraulic-mechanical model with two-phase flow for coalbed methane extraction

2016 ◽  
Vol 33 ◽  
pp. 324-336 ◽  
Author(s):  
Sheng Li ◽  
Chaojun Fan ◽  
Jun Han ◽  
Mingkun Luo ◽  
Zhenhua Yang ◽  
...  
Keyword(s):  
Mechanical Model ◽  
Coalbed Methane ◽  
Two Phase Flow ◽  
Phase Flow ◽  
Two Phase ◽  
Methane Extraction ◽  
Fully Coupled

An approximate semianalytical method for two-phase flow analysis of liquid-rich shale gas and tight light-oil wells

2019 ◽  
Vol 176 ◽  
pp. 562-572 ◽  
Author(s):  
Yonghui Wu ◽  
Linsong Cheng ◽  
Shijun Huang ◽  
Yuhu Bai ◽  
Pin Jia ◽  
...  
Keyword(s):  
Shale Gas ◽  
Two Phase Flow ◽  
Flow Analysis ◽  
Oil Wells ◽  
Phase Flow ◽  
Two Phase ◽  
Light Oil ◽  
Semianalytical Method

scholarly journals Analytical solutions of fractal-hydro-thermal model for two-phase flow in thermal stimulation enhanced coalbed methane recovery

2019 ◽  
Vol 23 (3 Part A) ◽  
pp. 1345-1353 ◽  
Author(s):  
Xiaoji Shang ◽  
Jianguo Wang ◽  
Zhizhen Zhang
Keyword(s):  
Heat Conduction ◽  
Coalbed Methane ◽  
Thermal Model ◽  
Two Phase Flow ◽  
Thermal Stimulation ◽  
Phase Flow ◽  
Two Phase ◽  
Methane Recovery ◽  
Enhanced Coalbed Methane Recovery ◽  
Enhanced Coalbed Methane

Thermal stimulation is a useful supplementary mining technique for the enhancement of coalbed methane recovery. This technique couples the temperature change with gas-water two-phase flow in the mining process. Many integer dimension hydro-thermal models have been proposed but cannot well describe this coupling because two-phase flow and heat conduction are usually non-linear, tortuous and fractal. In this study, a fractal-hydro-thermal coupling model is proposed to describe the coupling between heat conduction and two-phase flow behaviors in terms of fractional time and space derivatives. This model is analytically solved through the fractal travelling-wave method for pore pressure and production rate of gas and water. The analytical solutions are compared with the in-situ coalbed methane production rate. Results show that our proposed fractal-hydro-thermal model can describe both heat and mass transfers in thermal stimulation enhanced coalbed methane recovery.

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