Recent Advances in Flow and Transport Properties of Unconventional Reservoirs

Cai, Jianchao; Zhang, Zhien; Kang, Qinjun; Singh, Harpreet

doi:10.3390/en12101865

Cited by 12 publications

(9 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…During the hydraulic fracturing stages, a large variety of water-based fracturing fluids are injected into the shale reservoirs with low concentrations of proppant to create a fracture network to enhance the reservoir permeability. The majority of the injected water is retained in the subsurface with only around 6 ~ 10% recovery of injected water in the shale gas reservoirs in United States 11 – 13 . Once the fracturing water is absorbed into the shale matrix, the clay minerals will experience swelling, shrinkage and hydration damage.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation on water adsorption and desorption isotherms of the Longmaxi shale in the Sichuan Basin, China

Shen

et al. 2020

Sci Rep

View full text Add to dashboard Cite

the understanding of water adsorption and desorption behavior in the shale rocks is of great significance in the reserve estimation, wellbore stability and hydrocarbon extraction in the shale gas reservoirs. However, the water sorption behavior in the shales remains unclear. In this study, water vapor adsorption/desorption isotherms of the Longmaxi shale in the Sichuan Basin, china were conducted at various temperatures (30 °C, 60 °C) and a relative pressure up to 0.97 to understand the water sorption behavior. Then the effects of temperature and shale properties were analyzed, and the water adsorption, hysteresis, saturation and capillary pressure were discussed. The results indicate that water adsorption isotherms of the Longmaxi shale exhibit the type II characteristics. The water molecules initially adsorb on the shale particle/pore surfaces at low relative pressure while the capillary condensation dominates at high relative pressure. Temperature favors the water sorption in the shales at high relative pressure, and the GAB isotherm model is found to be suitable for describe the water adsorption/desorption behavior. The high organic carbon and full bedding are beneficial to water adsorption in the shales while the calcite inhibits the behavior. There exists the hysteresis between water adsorption and desorption at the whole relative pressure, which suggests that the depletion of condensed water from smaller capillary pores is more difficult than that from larger pores, and the chemical interaction contributes to the hysteresis loop for water sorption. The capillary pressure in the shales can be up to the order of several hundreds of Mpa, and thus the desorption of water from the shales may not be as easy as the water adsorption due to the high capillary pressure, which results in water retention behavior in the shale gas reservoirs. these results can provide insights into a better understanding of water sorption behavior in the shale so as to optimize extraction conditions and predict gas productivity in the shale gas reservoirs.

show abstract

Section: Introductionmentioning

confidence: 99%

Experimental investigation on water adsorption and desorption isotherms of the Longmaxi shale in the Sichuan Basin, China

Shen

et al. 2020

Sci Rep

View full text Add to dashboard Cite

show abstract

“…• "Recent advances in flow and transport properties of unconventional reservoirs" with two citations [70].…”

Section: Hydrocarbon Improvements Communitymentioning

confidence: 99%

“…In the Special Issue "Recent advances in flow and transport properties of unconventional reservoirs," Jianchao Cai and contributors review the 22 contributions published in this Special Issue to address this topic in depth. The review covers petrophysical characterization, hydraulic fracturing, fluid transport physics, improved oil recovery, and geothermal energy for unconventional reservoirs, for [70]. In the Special Issue "Emerging Advances in Petrophysics: Porous Media Characterization and Modeling of Multiphase Flow," Jianchao Cai and collaborators review 15 publications collected in this Special Issue devoted to experimental studies of petrophysical property characterization for unconventional resources, numerical modeling (fractal approach), and multiphase flow modeling/simulation of unconventional resources [71].…”

Section: Hydrocarbon Improvements Communitymentioning

confidence: 99%

Energies and Its Worldwide Research

et al. 2020

View full text Add to dashboard Cite

Energy efficiency and management is certainly one of the key drivers of human progress. Thus, the trends in the energy research are a topic of interest for the scientific community. The aim of this study is to highlight global research trends in this field through the analysis of a scientific journal indexed exclusively in the energy and fuels category. For this purpose, a journal has been selected that is in the center of the category considering its impact factor, which is only indexed in this category and of open access, Energies of the publisher MDPI. Therefore, a bibliometric analysis of all the contents of the journal between 2008 and 2020, 13,740 documents published, has been carried out. Analyzing the articles that are linked to each other by their citations, 14 clusters or research topics have been detected: smart grids; climate change–electric energy community; energy storage; bioenergy sources; prediction algorithms applied to power; optimization of the grid link for renewable energy; wind power; sustainability of power systems; hydrocarbon improvements; conversion of thermal/electrical energy; electric motor advancements; marine renewable energy; hydropower and energy storage; and preventive techniques in power transformers. The main keywords found were electric vehicle, renewable energy, microgrid, smart grid, and energy efficiency. In short, energy research remains necessary to meet the future challenge of sustainable energy with high efficiency and the exploration of new renewable resources, all for increasingly sustainable cities.

show abstract

“…High water cut means that the oil production is reduced and the flow capacity of oil declines. Therefore, describing the residual oil distribution characteristics accurately and analyzing the formation mechanism are crucial for recovering residual oil effectively and the subsequent development of water flooding [7], and as well the implementing of tertiary oil production techniques creates an additional chance to get more oil and gas from reservoirs [8,9]. Chemical flooding, as a tertiary oil recovery method, is widely used all over the world, especially in China [10].…”

Section: Introductionmentioning

confidence: 99%

A Pore-Scale Investigation of Residual Oil Distributions and Enhanced Oil Recovery Methods

et al. 2019

View full text Add to dashboard Cite

Water flooding is an economic method commonly used in secondary recovery, but a large quantity of crude oil is still trapped in reservoirs after water flooding. A deep understanding of the distribution of residual oil is essential for the subsequent development of water flooding. In this study, a pore-scale model is developed to study the formation process and distribution characteristics of residual oil. The Navier–Stokes equation coupled with a phase field method is employed to describe the flooding process and track the interface of fluids. The results show a significant difference in residual oil distribution at different wetting conditions. The difference is also reflected in the oil recovery and water cut curves. Much more oil is displaced in water-wet porous media than oil-wet porous media after water breakthrough. Furthermore, enhanced oil recovery (EOR) mechanisms of both surfactant and polymer flooding are studied, and the effect of operation times for different EOR methods are analyzed. The surfactant flooding not only improves oil displacement efficiency, but also increases microscale sweep efficiency by reducing the entry pressure of micropores. Polymer weakens the effect of capillary force by increasing the viscous force, which leads to an improvement in sweep efficiency. The injection time of the surfactant has an important impact on the field development due to the formation of predominant pathway, but the EOR effect of polymer flooding does not have a similar correlation with the operation times. Results from this study can provide theoretical guidance for the appropriate design of EOR methods such as the application of surfactant and polymer flooding.

show abstract

Recent Advances in Flow and Transport Properties of Unconventional Reservoirs

Cited by 12 publications

References 21 publications

Experimental investigation on water adsorption and desorption isotherms of the Longmaxi shale in the Sichuan Basin, China

Experimental investigation on water adsorption and desorption isotherms of the Longmaxi shale in the Sichuan Basin, China

Energies and Its Worldwide Research

A Pore-Scale Investigation of Residual Oil Distributions and Enhanced Oil Recovery Methods

Contact Info

Product

Resources

About