scholarly journals Experimental and numerical simulation of water adsorption and diffusion in shale gas reservoir rocks

2019 ◽  
Vol 3 (2) ◽  
pp. 165-174 ◽  
Author(s):  
Weijun Shen ◽  
Xizhe Li ◽  
Abdullah Cihan ◽  
Xiaobing Lu ◽  
Xiaohua Liu
Keyword(s):  
Numerical Simulation ◽  
Shale Gas ◽  
Water Adsorption ◽  
Gas Reservoir ◽  
Reservoir Rocks ◽  
Shale Gas Reservoir ◽  
And Diffusion

Numerical Simulation for Shale Gas Flow in Complex Fracture System of Fractured Horizontal Well

2018 ◽  
Vol 19 (3-4) ◽  
pp. 367-377 ◽  
Author(s):  
Yingzhong Yuan ◽  
Wende Yan ◽  
Fengbo Chen ◽  
Jiqiang Li ◽  
Qianhua Xiao ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Shale Gas ◽  
Horizontal Well ◽  
Fracture Network ◽  
Gas Reservoir ◽  
Complex Fracture ◽  
Shale Gas Reservoir ◽  
Fracture Parameters ◽  
Fracture Systems ◽  
Fractured Horizontal Well

AbstractComplex fracture systems including natural fractures and hydraulic fractures exist in shale gas reservoir with fractured horizontal well development. The flow of shale gas is a multi-scale flow process from microscopic nanometer pores to macroscopic large fractures. Due to the complexity of seepage mechanism and fracture parameters, it is difficult to realize fine numerical simulation for fractured horizontal wells in shale gas reservoirs. Mechanisms of adsorption–desorption on the surface of shale pores, slippage and Knudsen diffusion in the nanometer pores, Darcy and non-Darcy seepage in the matrix block and fractures are considered comprehensively in this paper. Through fine description of the complex fracture systems after horizontal well fracturing in shale gas reservoir, the problems of conventional corner point grids which are inflexible, directional, difficult to geometrically discretize arbitrarily oriented fractures are overcome. Discrete fracture network model based on unstructured perpendicular bisection grids is built in the numerical simulation. The results indicate that the discrete fracture network model can accurately describe fracture parameters including length, azimuth and density, and that the influences of fracture parameters on development effect of fractured horizontal well can be finely simulated. Cumulative production rate of shale gas is positively related to fracture half-length, fracture segments and fracture conductivity. When total fracture length is constant, fracturing effect is better if single fracture half-length or penetration ratio is relatively large and fracturing segments are moderate. Research results provide theoretical support for optimal design of fractured horizontal well in shale gas reservoir.

The numerical simulation of thermal recovery considering rock deformation in shale gas reservoir

2019 ◽  
Vol 138 ◽  
pp. 719-728 ◽  
Author(s):  
Jianwei Yuan ◽  
Ruizhong Jiang ◽  
Yongzheng Cui ◽  
Jianchun Xu ◽  
Qiong Wang ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Shale Gas ◽  
Thermal Recovery ◽  
Rock Deformation ◽  
Gas Reservoir ◽  
Shale Gas Reservoir

scholarly journals Research progress and prospects of CO2 enhanced shale gas recovery and geologic sequestration

2018 ◽  
Vol 53 ◽  
pp. 04002
Author(s):  
Rong Chen ◽  
GuoHui Zhang ◽  
ChengGao Yi
Keyword(s):  
Numerical Simulation ◽  
Shale Gas ◽  
Carbonic Acid ◽  
Research Progress ◽  
Geologic Sequestration ◽  
Affecting Factors ◽  
Gas Reservoir ◽  
Shale Formations ◽  
Gas Recovery ◽  
Shale Gas Reservoir

CO2 injection to strengthen shale gas development is a new technology to improve shale gas recovery and realize geologic sequestration. Many scholars have studied these aspects of this technology: mechanism of CO2 displacement CH4, CO2 and CH4 adsorption capacity, affecting factors of shale adsorption CO2, CO2 displacement numerical simulation, and supercritical CO2 flooding CH4 advantages. Research shows that CO2 can exchange CH4 in shale formations, improve shale gas recovery, on the other hand shale formations is suitable for CO2 sequestration because shale gas reservoir is compact. The supercritical CO2 has advantages such as large fluid diffusion coefficient, CO2 dissolution in water to form carbonic acid that can effectively improve the formation pore permeability etc., so the displacement efficiency of supercritical CO2 is high. But at present the technology study mainly focus on laboratory and numerical simulation, there is still a big gap to industrial application, need to study combined effect of influence factors, suitable CO2 injection parameter in different shale gas reservoir, CO2 injection risk and solutions etc.

Mechanical properties of shale-gas reservoir rocks — Part 2: Ductile creep, brittle strength, and their relation to the elastic modulus

Geophysics ◽  
2013 ◽  
Vol 78 (5) ◽  
pp. D393-D402 ◽  
Author(s):  
Hiroki Sone ◽  
Mark D. Zoback
Keyword(s):  
Elastic Modulus ◽  
Creep Behavior ◽  
Shale Gas ◽  
Sample Volume ◽  
Brittle Strength ◽  
Gas Reservoir ◽  
Reservoir Rocks ◽  
Shale Gas Reservoir ◽  
Stress Partitioning ◽  
Static Young’S Modulus

We studied the elastic moduli, ductile creep behavior, and brittle strength of shale-gas reservoir rocks from Barnett, Haynesville, Eagle Ford, and Fort St. John shale in a series of triaxial laboratory experiments. We found a strong correlation between the shale compositions, in particular, the volume of clay plus kerogen and intact rock strength, frictional strength, and viscoplastic creep. Viscoplastic creep strain was approximately linear with the applied differential stress. The reduction in sample volume during creep suggested that the creep was accommodated by slight pore compaction. In a manner similar to instantaneous strain, there was more viscoplastic creep in samples deformed perpendicular to the bedding than parallel to the bedding. The tendency to creep also correlated well with the static Young’s modulus. We explained this apparent correlation between creep behavior and elastic modulus by appealing to the stress partitioning that occurs between the soft components of the shales (clay and kerogen) and the stiff components (quartz, feldspar, pyrite, and carbonates). Through a simple 1D analysis, we found that a unique relation between the creep compliance and elastic modulus, independent of composition and orientation, can be established by considering the individual creep behavior of the soft and stiff components that arises from the stress partitioning within the rock. This appears to provide a mechanical explanation for why long-term ductile deformational properties can appear to correlate with short-term elastic properties in shale-gas reservoir rocks.

Mechanical properties of shale-gas reservoir rocks — Part 1: Static and dynamic elastic properties and anisotropy

Geophysics ◽  
2013 ◽  
Vol 78 (5) ◽  
pp. D381-D392 ◽  
Author(s):  
Hiroki Sone ◽  
Mark D. Zoback
Keyword(s):  
Elastic Properties ◽  
Shale Gas ◽  
Organic Content ◽  
S Wave ◽  
Gas Reservoir ◽  
Reservoir Rocks ◽  
Shale Gas Reservoir ◽  
Static Modulus ◽  
Static Young’S Modulus ◽  
Dynamic Elastic Properties

Understanding the controls on the elastic properties of reservoir rocks is crucial for exploration and successful production from hydrocarbon reservoirs. We studied the static and dynamic elastic properties of shale gas reservoir rocks from Barnett, Haynesville, Eagle Ford, and Fort St. John shales through laboratory experiments. The elastic properties of these rocks vary significantly between reservoirs (and within a reservoir) due to the wide variety of material composition and microstructures exhibited by these organic-rich shales. The static (Young’s modulus) and dynamic (P- and S-wave moduli) elastic parameters generally decrease monotonically with the clay plus kerogen content. The variation of the elastic moduli can be explained in terms of the Voigt and Reuss limits predicted by end-member components. However, the elastic properties of the shales are strongly anisotropic and the degree of anisotropy was found to correlate with the amount of clay and organic content as well as the shale fabric. We also found that the first-loading static modulus was, on average, approximately 20% lower than the unloading/reloading static modulus. Because the unloading/reloading static modulus compares quite well to the dynamic modulus in the rocks studied, comparing static and dynamic moduli can vary considerably depending on which static modulus is used.

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