A simulator for production prediction of multistage fractured horizontal well in shale gas reservoir considering complex fracture geometry

Zhang, Rui-han; Zhang, Liehui; Tang, Huiying; Chen, Sheng-nan; Zhao, Yulong; Wu, Jianfa; Wang, Keren

doi:10.1016/j.jngse.2019.04.011

Cited by 60 publications

(23 citation statements)

References 46 publications

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“…Adsorbed gas is mainly stored on the surface of matrix particles, kerogen, and clay minerals, and can account for 20-85% of total gas reserves [19,[45][46][47]. Gas adsorption on shale matrix particles belongs to physical adsorption [48].…”

Section: Adsorbed Gasmentioning

confidence: 99%

Review of Formation and Gas Characteristics in Shale Gas Reservoirs

et al. 2020

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An accurate understanding of formation and gas properties is crucial to the efficient development of shale gas resources. As one kind of unconventional energy, shale gas shows significant differences from conventional energy ones in terms of gas accumulation processes, pore structure characteristics, gas storage forms, physical parameters, and reservoir production modes. Traditional experimental techniques could not satisfy the need to capture the microscopic characteristics of pores and throats in shale plays. In this review, the uniqueness of shale gas reservoirs is elaborated from the perspective of: (1) geological and pore structural characteristics, (2) adsorption/desorption laws, and (3) differences in properties between the adsorbed gas and free gas. As to the first aspect, the mineral composition and organic geochemical characteristics of shale samples from the Longmaxi Formation, Sichuan Basin, China were measured and analyzed based on the experimental results. Principles of different methods to test pore size distribution in shale formations are introduced, after which the results of pore size distribution of samples from the Longmaxi shale are given. Based on the geological understanding of shale formations, three different types of shale gas and respective modeling methods are reviewed. Afterwards, the conventional adsorption models, Gibbs excess adsorption behaviors, and supercritical adsorption characteristics, as well as their applicability to engineering problems, are introduced. Finally, six methods of calculating virtual saturated vapor pressure, seven methods of giving adsorbed gas density, and 12 methods of calculating gas viscosity in different pressure and temperature conditions are collected and compared, with the recommended methods given after a comparison.

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Section: Adsorbed Gasmentioning

confidence: 99%

Review of Formation and Gas Characteristics in Shale Gas Reservoirs

et al. 2020

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“…Analytical and numerical methods are used to simulate fluid flow in porous medium. Analytical models use solutions to simple reservoir behaviour [6][7][8][9][10][11] while numerical simulation ones use solutions to more complex reservoir behaviour [12][13][14]. Straightline analysis methods are analogous to those used in pressure transient analysis [15].…”

Section: Introductionmentioning

confidence: 99%

Modern Decline Curve Analysis of Unconventional Reservoirs: A Comparative Study Using Actual Data

Wahba

Khattab

Tantawy

et al. 2022

Journal of Petroleum and Mining Engineering

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Petroleum consumption increases around the world and production of conventional reservoirs can't cover the increased demand. So, producing unconventional resources is an imperative necessity.Unconventional resources are characterized by very low permeability. Drilling horizontal wells in these resources and completed them with multiple hydraulic fractures make the reservoir. Hydraulic fractures work as paths for hydrocarbon to flow toward the wellbore to achieve an economic production rate. Production behaviour of these wells is characterized by long-term transient flow followed by boundarydominated flow. Many decline curve analysis models have been developed to simulate this behaviour, but none of them can capture all flow-regime types. This paper reviewed the most popular and used decline curve analysis models: Arps model, power-law exponential model, stretched exponential production decline model, T-model, logistic growth model, Duong model, Yu-Miocevic model and extended exponential decline curve. This paper summarized the origins, derivations and assumptions of these eight models. This paper also presents a comparative study of these models using production data from unconventional gas and oil reservoirs. To facilitate conducting this study, the eight decline curve analysis models were programmed in a software application written in python language. This software application calibrated models' parameters to production data using trust region reflective algorithm. The value of estimated ultimate recovery predicted using this software application is consistent with that predicted using the linear flow analysis model. The comparative study can serve as a guideline for petroleum engineers to determine when to use each model.

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“…20 Zhang et al proposed a coupled MINC media and discrete fracture networks (DFNs) model for MFHW with a complex fracture geometry in a shale gas reservoir. 21 Wei et al presented a triple-continuum and discrete fracture model to describe a fractured shale reservoir embedded with an MFHW, and the discrete fracture networks (DFNs) are quantitatively constructed according to the fracture density and stimulated reservoir area (SRA). 22 Zhong et al constructed a highresolution 3D reservoir model by upscaling the stochastic 3D DFN model into an equivalent continuum dual-porosity dualpermeability (DPDK) model and employed an apparent permeability (Kapp) model to model transport mechanisms in nano-sized pore systems.…”

Section: Introductionmentioning

confidence: 99%

“…Zhao et al described the shale reservoir by a triple medium model composed of a double-continuous medium and a discrete fracture model and consider multiple migration mechanisms considering compression and matrix shrinkage . Zhang et al proposed a coupled MINC media and discrete fracture networks (DFNs) model for MFHW with a complex fracture geometry in a shale gas reservoir . Wei et al presented a triple-continuum and discrete fracture model to describe a fractured shale reservoir embedded with an MFHW, and the discrete fracture networks (DFNs) are quantitatively constructed according to the fracture density and stimulated reservoir area (SRA) .…”

Section: Introductionmentioning

confidence: 99%

Modeling and Simulation of Shale Fracture Attitude

2021

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A large number of natural fractures are distributed in shale gas reservoirs. In-depth studying of the attitude of fractures is of great significance for the efficient development of shale gas. In previous studies, the complex three-dimensional discrete fracture networks (DFNs) and transport mechanisms were often not fully considered. In this study, the fully coupled multimechanism transport model and the complex discrete fracture networks (DFNs) model are developed to incorporate these complexities. The comprehensive transport model can couple multiple mechanisms such as slippage, diffusion, adsorption, and dissolution of shale gas. Moreover, the mechanisms of two-phase flow, reservoir deformation, real gas effect, and fracture closure are also considered. The three-dimensional DFN model can flexibly characterize the fracture attitudes, which means that the construction of the discrete fracture network is easier and faster. Under these frameworks, a series of partial differential equations (PDEs) were derived to describe transport mechanisms of shale gas in the shale fracture-matrix system. These PDEs were numerically discretized and solved by the finite element method. The proposed models are verified against gas production data from the field and validated against others' solutions. This study numerically simulates the influence of different fracture attitudes on shale gas transport and analyzes the sensitivity of the model. The results and sensitivity analysis reveal that both fracture dip angle and strike direction will significantly affect the gas production, and the smaller the angle between the strike direction and the flow direction, the higher the shale gas production. The length, density, area, and shape of fractures also play important roles in shale gas transport. There is an ideal fracture density in the fracture network, and the suggested excessive fracturing is not economic. The shale fracture-matrix system modeling and simulation methods can improve the development of shale gas reservoirs and increase the gas production of wells.

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A simulator for production prediction of multistage fractured horizontal well in shale gas reservoir considering complex fracture geometry

Cited by 60 publications

References 46 publications

Review of Formation and Gas Characteristics in Shale Gas Reservoirs

Review of Formation and Gas Characteristics in Shale Gas Reservoirs

Modern Decline Curve Analysis of Unconventional Reservoirs: A Comparative Study Using Actual Data

Modeling and Simulation of Shale Fracture Attitude

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