scholarly journals Transient Pressure Analysis for Multifractured Horizontal Well with the Use of Multilinear Flow Model in Shale Gas Reservoir

Geofluids ◽  
2020 ◽  
Vol 2020 ◽  
pp. 1-20 ◽  
Author(s):  
Guangdong Wang ◽  
Ailin Jia ◽  
Yunsheng Wei ◽  
Cong Xiao
Keyword(s):  
Hydraulic Fracturing ◽  
Shale Gas ◽  
Flow Model ◽  
Stress Sensitivity ◽  
Critical Parameters ◽  
Hydraulic Fractures ◽  
Transient Pressure ◽  
Transient Pressure Analysis ◽  
Spatially Varying ◽  
Pressure Analysis

Shale gas reservoirs (SGR) have been a central supply of carbon hydrogen energy consumption and hence widely produced with the assistance of advanced hydraulic fracturing technologies. On the one hand, due to the inherent ultralow permeability and porosity, there is stress sensitivity in the reservoirs generally. On the other hand, hydraulic fractures and the stimulated reservoir volume (SRV) generated by the massive hydraulic fracturing operation have contrast properties with the original reservoirs. These two phenomena pose huge challenges in SGR transient pressure analysis. Limited works have been done to take the stress sensitivity and spatially varying permeability of the SRV zone into consideration simultaneously. This paper first idealizes the SGR to be four linear composite regions. What is more, the SRV zone is further divided into subsections on the basis of nonuniform distribution of proppant within the SRV zone which easily yields spatially varying permeability away from the main hydraulic fracture. By means of perturbation transformation and Laplace transformation, an analytical multilinear flow model (MLFM) is obtained and validated as a comparison with the previous models. The flow regimes are identified, and the sensitivity analysis of critical parameters is conducted to further understand the transient pressure behaviors. The research results provided by this work are of significance for an effective recovery of SGR resources.

scholarly journals Transient Pressure Analysis for Multi-Fractured Horizontal Well with the Use of Multi-Linear Flow Model in Stress Sensitive Shale Gas Reservoir

2019 ◽  
Author(s):  
Guangdong Wang ◽  
Ailin Jia ◽  
Yunsheng Wei ◽  
Cong Xiao
Keyword(s):  
Hydraulic Fracturing ◽  
Shale Gas ◽  
Flow Model ◽  
Stress Sensitivity ◽  
Critical Parameters ◽  
Transient Pressure ◽  
Linear Flow ◽  
Transient Pressure Analysis ◽  
Spatially Varying ◽  
Pressure Analysis

Shale gas reservoirs (SGR) are important replacements for conventional energy resources and have been widely exploited by hydraulic fracturing technologies. On the one hand, due to the inherent ultra-low permeability and porosity, there is stress sensitivity in the reservoirs generally. On the other hand, hydraulic fractures and the stimulated reservoir volume (SRV) generated by the massive hydraulic fracturing operation have contrast properties with the original reservoirs. These two phenomena bring huge challenges in SGR transient pressure analysis. Although some works in the literatures have been done on the transient pressure analysis of multi-fractured horizontal wells in SGR, unfortunately, none of them has taken the stress sensitivity and spatially varying permeability of SRV zone into consideration simultaneously. To fill this gap, this paper first idealizes the SGR to be four linear composite regions. What’s more, SRV zone is further divided into sub-sections on the basis of non-uniform distribution of proppant within SRV zone which easily yields spatially varying permeability away from the main hydraulic fracture. The stress sensitivity is characterized by the varying permeability depended on the pore pressure. By means of perturbation transformation and Laplace transformation, an analytical multi-linear flow model (MLFM) is obtained and validated by the comparison with the previous model. On the basis of our model, the flow regimes are identified and the sensitivity analysis of critical parameters are conducted to further understand the transient pressure behaviors. The research results provided by this work are of significance for well test interpretation and production performance analysis of SGR.

The Dual-Porosity Vertical-Well Model for Transient Pressure Analysis of Naturally Fractured Shale Gas Reservoirs

2013 ◽  
Vol 448-453 ◽  
pp. 3958-3962
Author(s):  
Yi Jiang ◽  
Rui Xu ◽  
Meng Chen
Keyword(s):  
Shale Gas ◽  
Stress Sensitivity ◽  
Dual Porosity ◽  
Well Testing ◽  
Algebraic Equations ◽  
Transient Pressure ◽  
Gas Reservoirs ◽  
Shale Gas Reservoirs ◽  
Transient Pressure Analysis ◽  
Numerical Well Testing

During the process of development for shale gas reservoirs, the permeability of fractures will decrease due to stress-sensitive effect. Adsorption is also an important mechanism which determines the production of shale gas reservoirs. Therefore, the effect of stress sensitivity and adsorption must be considered in the numerical model for pressure transient analysis. In this paper, a dual-porosity model was established considering both mechanisms, and finite-difference method was used for discretizing fluid equations. Then Newton method was applied for solving the resulting algebraic equations, and the typical curves in terms of dimensionless pseudopressure and time were drawn with different sets of parameters. The numerical well-testing model provides theoretical basis for interpreting production data of shale gas reservoirs.

Sign in / Sign up

Export Citation Format

Share Document