A new approach to model shale gas production behavior by considering coupled multiple flow mechanisms for multiple fractured horizontal well

Fuel ◽  
2019 ◽  
Vol 237 ◽  
pp. 283-297 ◽  
Author(s):  
Ting Lu ◽  
Shimin Liu ◽  
Zhiping Li
Keyword(s):  
Shale Gas ◽  
Horizontal Well ◽  
Gas Production ◽  
New Approach ◽  
Fractured Horizontal Well ◽  
Flow Mechanisms ◽  
Production Behavior

scholarly journals Ensemble-based optimization of hydraulically fractured horizontal well placement in shale gas reservoir through Hough transform parameterization

2021 ◽  
Author(s):  
Liang Xue ◽  
Shao-Hua Gu ◽  
Xie-Er Jiang ◽  
Yue-Tian Liu ◽  
Chen Yang
Keyword(s):  
Simulation Model ◽  
Shale Gas ◽  
Horizontal Well ◽  
Gas Production ◽  
Design Parameters ◽  
Hydraulic Fractures ◽  
Gas Reservoir ◽  
Well Drilling ◽  
Shale Gas Reservoir ◽  
Fractured Horizontal Well

AbstractShale gas reservoirs have been successfully developed due to the advancement of the horizontal well drilling and multistage hydraulic fracturing techniques. However, the optimization design of the horizontal well drilling, hydraulic fracturing, and operational schedule is a challenging problem. An ensemble-based optimization method (EnOpt) is proposed here to optimize the design of the hydraulically fractured horizontal well in the shale gas reservoir. The objective is to maximize the net present value (NPV) which requires a simulation model to predict the cumulative shale gas production. To accurately describe the geometry of the hydraulic fractures, the embedded discrete fracture modeling method (EDFM) is used to construct the shale gas simulation model. The effects of gas absorption, Knudsen diffusion, natural and hydraulic fractures, and gas–water two phase flow are considered in the shale gas production system. To improve the parameter continuity and Gaussianity required by the EnOpt method, the Hough transformation parameterization is used to characterize the horizontal well. The results show that the proposed method can effectively optimize the design parameters of the hydraulically fractured horizontal well, and the NPV can be improved greatly after optimization so that the design parameters can approach to their optimal values.

IMPACTS OF ZONE FRACTAL PROPERTIES ON SHALE GAS PRODUCTIVITY OF A MULTIPLE FRACTURED HORIZONTAL WELL

Fractals ◽  
2019 ◽  
Vol 27 (02) ◽  
pp. 1950006 ◽  
Author(s):  
BOWEN HU ◽  
J. G. WANG ◽  
DI WU ◽  
HUIMIN WANG
Keyword(s):  
Fractal Dimension ◽  
Numerical Model ◽  
Shale Gas ◽  
Horizontal Well ◽  
Pore Diameter ◽  
Gas Production ◽  
Dual Porosity ◽  
Dimension Formula ◽  
Fractured Horizontal Well ◽  
Fractal Properties

A multiple fractured shale gas reservoir is divided into three zones, namely the single-porosity zone, the dual-porosity zone, and the hydraulic fracture zone. The distributions of pore size, fracture length, and fracture aperture vary in each zone and affect shale gas productivity. This paper developed a fractal numerical model to investigate the impacts of zone fractal properties on the shale gas productivity of a multiple fractured horizontal well. In this model, a fractal permeability model was developed, in which the diameter/aperture distribution of circular/slit pores and the length of fractures all follow fractal scaling law. This numerical model was solved by finite element method within the platform of COMSOL Multiphysics and verified through the history matching of production data from the Marcellus and Barnett shale reservoirs. Finally, the effects of the fractal dimension ([Formula: see text], [Formula: see text], [Formula: see text]) and the maximum diameter ([Formula: see text]) of the pores on gas productivity (measured by gas production rate and cumulative gas production) were investigated. Numerical results show that increasing the maximum pore diameter [Formula: see text] can enhance gas productivity, but increasing the pore diameter fractal dimension [Formula: see text] makes the gas productivity decrease and increasing tortuous fractal dimension [Formula: see text] decreases the gas productivity, too. The length fractal dimension [Formula: see text] of fractures is sensitive to the gas flow in the dual-porosity zone.

Diffusion and Flow Mechanisms of Shale Gas through Matrix Pores and Gas Production Forecasting

2013 ◽  
Author(s):  
Juntai Shi ◽  
Lei Zhang ◽  
Yuansheng Li ◽  
Wei Yu ◽  
Xiangnan He ◽  
...  
Keyword(s):  
Shale Gas ◽  
Gas Production ◽  
Production Forecasting ◽  
Flow Mechanisms

scholarly journals Production Rate Analysis of Fractured Horizontal Well considering Multitransport Mechanisms in Shale Gas Reservoir

Geofluids ◽  
2018 ◽  
Vol 2018 ◽  
pp. 1-17 ◽  
Author(s):  
Qi-guo Liu ◽  
Wei-hong Wang ◽  
Hua Liu ◽  
Guangdong Zhang ◽  
Long-xin Li ◽  
...  
Keyword(s):  
Production Rate ◽  
Shale Gas ◽  
Horizontal Well ◽  
Production Performance ◽  
Natural Fractures ◽  
Gas Reservoir ◽  
Isothermal Adsorption ◽  
Well Production ◽  
Shale Gas Reservoir ◽  
Fractured Horizontal Well

Shale gas reservoir has been aggressively exploited around the world, which has complex pore structure with multiple transport mechanisms according to the reservoir characteristics. In this paper, a new comprehensive mathematical model is established to analyze the production performance of multiple fractured horizontal well (MFHW) in box-shaped shale gas reservoir considering multiscaled flow mechanisms (ad/desorption and Fick diffusion). In the model, the adsorbed gas is assumed not directly diffused into the natural macrofractures but into the macropores of matrix first and then flows into the natural fractures. The ad/desorption phenomenon of shale gas on the matrix particles is described by a combination of the Langmuir’s isothermal adsorption equation, continuity equation, gas state equation, and the motion equation in matrix system. On the basis of the Green’s function theory, the point source solution is derived under the assumption that gas flow from macropores into natural fractures follows transient interporosity and absorbed gas diffused into macropores from nanopores follows unsteady-state diffusion. The production rate expression of a MFHW producing at constant bottomhole pressure is obtained by using Duhamel’s principle. Moreover, the curves of well production rate and cumulative production vs. time are plotted by Stehfest numerical inversion algorithm and also the effects of influential factors on well production performance are analyzed. The results derived in this paper have significance to the guidance of shale gas reservoir development.

Effects of Adsorption and Confinement on Shale Gas Production Behavior

2015 ◽  
Author(s):  
K. Zhang ◽  
M. Wang ◽  
Q. Liu ◽  
K. Wu ◽  
L. Yu ◽  
...  
Keyword(s):  
Shale Gas ◽  
Gas Production ◽  
Production Behavior
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