Pressure-Dependent Natural-Fracture Permeability in Shale and Its Effect on Shale-Gas Well Production

Cho, Younki; Özkan, Erdal; Apaydin, O.G.

doi:10.2118/159801-pa

Cited by 276 publications

(75 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Cho et al [7] conducted an experimental study to investigate the relationship between the natural fracture permeability and reservoir pressure using Bakken core samples. Zhang et al [19] demonstrated that high proppant concentration was critical to the maintenance of effective fracture conductivity.…”

Section: Stress-dependent Fracture Permeability and Contact Surface Areamentioning

confidence: 99%

“…The influence of the natural fractures will be presented in a separate work. The compliance of hydraulic fractures spans a wide range according to the literature due to the variations in proppant embedment and rock properties [6,7]. In the work by Suarez-Rivera and Burghardt [6], the authors reported the measured fracture compliance of approximately 0.11 MPa −1 for propped fractures and 0.34 MPa −1 for unpropped fractures.…”

Section: Stress-dependent Fracture Permeability and Contact Surface Areamentioning

confidence: 99%

“…The conductivities of fractures were found to be very sensitive to the applied effective stress based on the experiment results [6]. The impact of stress-dependent fracture conductivities on gas production has been studied using numerical simulations [7,8]. Besides, the contact area between matrix and fractures will affect gas transport between matrix and fractures.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Impact of Stress-Dependent Matrix and Fracture Properties on Shale Gas Production

Tang

Zhang

et al. 2017

Energies

View full text Add to dashboard Cite

Unconventional shale gas production is often characterized by a short period of high production followed by a rapid decline in the production rate. Given the high costs of hydraulic fracturing and horizontal drilling, it is critical to identify the mechanisms behind the production loss. The existing shale gas production models often assume constant matrix permeability. However, laboratory observations show that matrix permeability can decrease significantly with increasing effective stress, which highlights the necessity of considering the stress-dependent properties of shale matrix in production analysis. Moreover, the compaction of pore space will also increase the matrix permeability by enhancing the gas-slippage effect. In this paper, a matrix permeability model which couples the effect of pore volume compaction and non-Darcy slip flow is derived. Numerical simulations are conducted to understand the role of matrix permeability evolution during production. Changes of fractures' permeability and contact area during depletion process are also taken into account. The results indicate that the loss of fracture permeability has a greater impact at the early stage of the depletion process, while matrix permeability evolution is more important for the long-term production.

show abstract

Section: Stress-dependent Fracture Permeability and Contact Surface Areamentioning

confidence: 99%

Section: Stress-dependent Fracture Permeability and Contact Surface Areamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Impact of Stress-Dependent Matrix and Fracture Properties on Shale Gas Production

Tang

Zhang

et al. 2017

Energies

View full text Add to dashboard Cite

show abstract

“…First, we simulate an ideal case in which fracture network conductivity doesn't change with time. In a second, more realistic case, the expected reduction in permeability (pressuredependent permeability, PDP) of the simulated fracture network caused by the increasing effective stress during production is simulated as (Cho et al, 2013;Raghavan et al, 2004):…”

Section: Impact Of Natural Fracturesmentioning

confidence: 99%

Impact of Shale-Gas Apparent Permeability on Production: Combined Effects of Non-Darcy Flow/Gas Slippage, Desorption, and Geomechanics

Wang

Marongiu-Porcu

2015

SPE Reservoir Evaluation &Amp; Engineering

View full text Add to dashboard Cite

SummaryMany shale gas and ultralow permeability tight gas reservoirs can have matrix permeability values in the range of tens to hundreds of nanodarcies. The ultrafine pore structure of these rocks can cause violation of the basic assumptions behind Darcy's law. Depending on a combination of pressure-temperature (P-T) conditions, pore structure and gas properties, NonDarcy flow mechanisms such as Knudsen diffusion and/or Gas-Slippage effects will impact the matrix apparent permeability. Even though numerous theoretical and empirical models have been proposed to describe the increasing apparent permeability due to Non-Darcy flow/Gas-Slippage behavior in nano-pore space, few literature have investigated the impact of formation compaction and the release of adsorption layer on shale matrix apparent permeability, which can be coupled together with the Non-Darcy flow/Gas-Slippage mechanism, during reservoir depletion.In this article, we first presented a thoroughly review on gas flow in shale nano-pore space and discussed what factors can impact shale matrix apparent permeability, besides the well-studied Non-Darcy flow/Gas-Slippage behavior. Then, a unified shale matrix apparent permeability model is proposed to bridge the effects of Non-Darcy flow/Gas-Slippage, geomechanics (formation compaction) and the release of adsorption layer into a single, coherent equation. In addition, a mathematical framework for an unconventional reservoir simulator that developed in this study is also presented.Different matrix apparent permeability models are implemented in the numerical simulator to examine what factors impact the matrix apparent permeability most. Furthermore, how these factors influence the average apparent permeability in the Simulated Reservoir Volume (SRV) and long-term production are also discussed. Finally, the impact of natural fracture networks on matrix apparent permeability evolution is investigated. The results indicate that even though the conductive fracture networks play a vital role in shale gas production, the matrix apparent permeability evolution during pressure depletion can still make a difference.

show abstract

“…SG has complex characteristics such as large reserves, long production cycle, somewhat expensive exploration costs compared with other unconventional types of gas reservoirs and so on. The complexity of SG brings that the fields of SGR during the past years are diverse, which include theoretical SGR of analyzing the foundation of SG exploration [1,2,10,[24][25][26], model investigation in SG [24,[27][28][29][30][31][32][33], technical and economic research of considering the potential application of SG [7,25,[33][34][35][36], the environmental impact assessment in SG exploitation [21,[37][38][39][40][41][42][43][44][45][46][47][48] and many others. Anyway, with the evolution from initial exploitation to the more and more complicated development of SG, the diverse research of SG can be found in available literature during past decades.…”

Section: Introductionmentioning

confidence: 99%

An Investigation of the Underlying Evolution of Shale Gas Research’s Domain Based on the Co-Word Network

Li¹,

Liu²,

Siqi³

et al. 2018

Sustainability

View full text Add to dashboard Cite

Abstract:With the increasing shortage energy, the exploration and utilization of shale gas (SG) have greatly changed the world's natural gas supply pattern. In this study, based on a bibliometric review of the publications related to SG, by analyzing the co-word networks during the past years, we provide comprehensive analyses on the underlying domain evolution of shale gas research (SGR). Firstly, we visualize the topical development of SGR. We not only identify the key topics at each stage but also reveal their underlying dependence and evolutionary trends. The directions of SGR in the future are implied. Secondly, we find the co-word network has small-world and scale-free characteristics, which are the important mechanisms of driving the evolution of SGR's domain. Thirdly, we analyze China's SGR. We find the co-word network in China's SGR has not yet emerged obvious differentiation. Nevertheless, it has a similar self-organized evolution process with the co-word network of international SGR. Our above results can provide references for the future SGR of scholars, optimization or control of the domain and the strategy/policy of countries or globalization.

show abstract

Pressure-Dependent Natural-Fracture Permeability in Shale and Its Effect on Shale-Gas Well Production

Cited by 276 publications

References 29 publications

Impact of Stress-Dependent Matrix and Fracture Properties on Shale Gas Production

Impact of Stress-Dependent Matrix and Fracture Properties on Shale Gas Production

Impact of Shale-Gas Apparent Permeability on Production: Combined Effects of Non-Darcy Flow/Gas Slippage, Desorption, and Geomechanics

An Investigation of the Underlying Evolution of Shale Gas Research’s Domain Based on the Co-Word Network

Contact Info

Product

Resources

About