Article
Polymer Science
Guodong Zou, Bin Pan, Weiyao Zhu, Yuwei Liu, Shou Ma, Mingming Liu
Summary: Fracturing fluids are widely used in hydraulic fracturing of shale gas reservoirs, but the efficiency of fluid flowback is often less than 50%, which limits shale gas recovery. This study conducted microscopic experiments to simulate the flowback process of fracturing fluids in shale gas reservoirs and analyzed the mechanisms and factors affecting flowback/retention. The results showed that flowback efficiency is positively correlated with fluid concentration and gas driving pressure difference. The study also identified four mechanisms responsible for fluid retention and observed that flowback efficiency increases with higher capillary number. These findings contribute to the understanding of fracturing fluid flowback in shale gas reservoirs and provide guidance for reservoir development.
Article
Geosciences, Multidisciplinary
Ayyaz Mustafa, Zeeshan Tariq, Mohamed Mahmoud, Ahmed E. Radwan, Abdulazeez Abdulraheem, Mohamed Omar Abouelresh
Summary: This study utilizes artificial intelligence techniques to predict the mineralogy of Qusaiba Shale, specifically the clay and quartz minerals. The predictive models demonstrate high accuracy and can be used for evaluating the prospects and optimizing production of unconventional shale gas reservoirs, while also saving costs and resources.
MARINE AND PETROLEUM GEOLOGY
(2022)
Article
Green & Sustainable Science & Technology
Zhaoxian Zheng, Yan Zhang, Bingyan Li
Summary: This paper analyzed the hydrogeochemical processes affecting boron isotopes in HFFF-contaminated groundwater and constructed a model to evaluate the sensitivity of boron isotopes as an indicator of HFFF contamination. The results showed that the dissolution of alkali feldspar and precipitation of carbonate had little effect on the boron isotopes in shallow groundwater. The preferential adsorption of boron isotopes onto clay minerals reduced the sensitivity of boron isotopes as an indicator of groundwater contamination from HFFF.
Article
Environmental Sciences
Joanna Fajfer, Olga Lipinska, Monika Konieczynska
Summary: This passage discusses the chemical characteristics of flowback fluids from hydraulic fracturing for shale gas exploration/production, showing that the variability in their chemical composition is significant at different locations, depending on the sampling schedule.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2022)
Article
Engineering, Environmental
Hong-Yang Ren, Han Mao, Wen-Hui Jin, Jia-Min Wang, Liang Ma, Bing Wang
Summary: The ceramic membrane-ED-H/L pressure RO combined process was used to treat fracturing flowback fluid, with high removal efficiencies of TDS and COD. The decrease in membrane flux was caused by the formation of organic and inorganic composite. The removal efficiency of organic pollutants was positively correlated with operating voltage in ED, and further improved by RO operation.
JOURNAL OF WATER PROCESS ENGINEERING
(2023)
Article
Energy & Fuels
Xiong Ying, Zhou Houan, Zhou Lang, Pu Junhong
Summary: In this study, a new dithiocarbamate-type flocculant DTC-TETA was used for coagulation-flocculation treatment of flowback water from shale gas hydraulic fracturing. The results showed that DTC-TETA had better performance than polyaluminum chloride and could effectively remove suspended solids and Fe2+ ions in the flowback water.
PETROLEUM SCIENCE AND TECHNOLOGY
(2023)
Review
Ecology
Hu Li
Summary: This paper reviews the impact of shale gas development on the ecological environment and identifies strategies for achieving coordinated development and conservation in China. The challenges include water resources consumption, groundwater pollution, methane emissions, and waste management. Measures such as responsible water usage and proper disposal of fracturing flowback fluids can address these challenges. Additionally, establishing a solid theoretical framework, refining environmental management standards, and promoting the development of clean production technologies are crucial for green and efficient shale gas development in China.
FRONTIERS IN ECOLOGY AND EVOLUTION
(2023)
Article
Engineering, Chemical
Ali Shawaf, Vamegh Rasouli, Abdesselem Dehdouh
Summary: Multi-stage hydraulic fracturing is the main technology for improving hydrocarbon recovery from shale plays. Ignoring the anisotropic nature of shale formations leads to erroneous estimates of in situ stresses, affecting the design of fractural geometry and the ultimate recovery.
Article
Geosciences, Multidisciplinary
David K. Loydell, Mohamed Abouelresh
Summary: The unique layer of carbonate concretions within the Qusaiba Shale Formation in north-west Saudi Arabia is dated to the early Aeronian, serving as a potential stratigraphic marker and influencing the burial of organic carbon. Similar occurrences of carbonates in other geological structures suggest that they may result from the dissolution and reprecipitation of carbonate from shell faunas, impacting the preservation of organic materials.
BULLETIN OF GEOSCIENCES
(2021)
Article
Engineering, Chemical
Luis German Hernandez-Perez, Luis Fernando Lira-Barragan, Mahmoud M. El-Halwagi, Jose Maria Ponce-Ortega
Summary: This paper addresses the multi-objective optimization of water management in shale gas extraction through hydraulic fracturing. The optimization aims to minimize the total annual cost and water requirements. A hybrid optimization method is proposed, combining deterministic and metaheuristic approaches. The deterministic model is programmed in GAMS software, while the metaheuristic algorithm is implemented in Microsoft Excel. Uncertainty is considered through a stochastic tool coded in Visual Basic for Applications. Communication between the necessary programs is achieved through code sets also programmed in Visual Basic for Applications. A case study is solved to demonstrate the proposed approach, providing optimal operation scheduling for wells while accounting for cost and freshwater consumption. The results also determine the maximum feasible number of wells, prioritizing either economic or environmental objectives.
CHEMICAL ENGINEERING RESEARCH & DESIGN
(2022)
Article
Energy & Fuels
Nan Zhang, Lijun You, Yili Kang, Jieming Xu, Keming Li, Qiuyang Cheng, Yang Zhou
Summary: This study proposes a new strategy, known as zero flowback rate (ZFR), for dealing with hydraulic fracturing fluid (HFF) in shale gas reservoirs. The research finds that for certain wells, the ZFR strategy is a better option. However, there is a lack of quantifiable studies on the methods for implementing ZFR and the benefits of ZFR.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2022)
Article
Geosciences, Multidisciplinary
Ayman N. Qadrouh, Mamdoh S. Alajmi, Abdulrahman M. Alotaibi, Hassan Baioumy, Majed A. Almalki, Mazen M. Alyousif, Ahmed Mohamed Ahmed Salim, Abdulrahman M. Bin Rogaib
Summary: The mineralogical and geochemical analysis of the Early Silurian Qusaiba shale from Saudi Arabia reveals its origin, depositional environment, and tectonic setting, indicating a shallow marine environment in the northeastern Gondwana during the Paleozoic era. It represents a transgressive phase following a Late Ordovician regressive event, with indications of a passive margin tectonic setting and late diagenesis stage based on illite content and IC values.
MARINE AND PETROLEUM GEOLOGY
(2021)
Article
Geochemistry & Geophysics
Katherine N. Snihur, Logan R. Swaren, Konstantin von Gunten, Nicholas B. Harris, Sasha Wilson, Murray K. Gingras, Kurt O. Konhauser, Shannon L. Flynn, Daniel S. Alessi
Summary: The study demonstrates the potential of using laboratory methods to predict the inorganic chemistry of flowback and produced water in hydraulic fracturing operations. High salinity experiments showed an increase in concentrations of dissolved species with increasing salinity. The research also highlights the environmental risks associated with using recycled produced water in hydraulic fracturing, especially in the event of a spill.
Article
Environmental Sciences
Erik J. Folkerts, Katherine N. Snihur, Yifeng Zhang, Jonathan W. Martin, Daniel S. Alessi, Greg G. Goss
Summary: This study investigates the impacts of flowback and produced water (FPW) from hydraulic fracturing on the cardio-respiratory system development and function of rainbow trout embryos. The researchers found that FPW exposure led to developmental deformities, changes in embryonic respiration rates, and altered expression of cardiac-specific genes. These findings suggest that cardio-respiratory tissues are specifically targeted by FPW exposure, providing valuable information for regulatory bodies in developing hazard identification and risk management protocols for hydraulic fracturing activities.
ENVIRONMENTAL POLLUTION
(2022)
Article
Geosciences, Multidisciplinary
Yapei Ye, Shuheng Tang, Zhaodong Xi, Renqi Lu, Zhongyao Zhang, Jintao Li
Summary: Studying the microscopic characteristics of shale can provide a theoretical basis for evaluating its macroscopic mechanical properties and fracturability. Different types of quartz in shale have different effects on the quality of shale oil/gas reservoirs. This study used finite element numerical simulation to set up different models based on the microscopic occurrence states of quartz, and found that the size and occurrence mode of quartz have a significant impact on shale compressive strength, while quartz content has the most significant influence on shale brittleness. The presence of quartz particles can enhance the compressive strength of shale and form complex fracture networks.
NATURAL RESOURCES RESEARCH
(2023)