“…We nevertheless encourage researchers to include them in future research since these are also prominent databases with qualitycontrolled journals. Our search terms for String 1 and 2 were selected based on previous studies conducted by the authoring team (see for example [44,45,85,86,95,96]). Whereas the search terms for String (topical area) were selected after examining relevant abstracts and articles for alternative subject phrases and words.…”
Section: Searching Protocol and Analytical Parametersmentioning
“…We nevertheless encourage researchers to include them in future research since these are also prominent databases with qualitycontrolled journals. Our search terms for String 1 and 2 were selected based on previous studies conducted by the authoring team (see for example [44,45,85,86,95,96]). Whereas the search terms for String (topical area) were selected after examining relevant abstracts and articles for alternative subject phrases and words.…”
Section: Searching Protocol and Analytical Parametersmentioning
“…1,2 In addition to its abundant reserves, natural gas releases lower amounts of greenhouse gas emissions in comparison with the rest of the fossil fuels. 3,4 Shale gas is a type of unconventional natural gas that can be an effective complement for renewable energies toward a sustainable energy transition. 5,6 Moreover, shale gas is abundant worldwide with a recoverable resource quantity equal to 7257 Tcf as well as relatively low exploitation costs.…”
Section: ■ Introductionmentioning
confidence: 99%
“…The use of natural gas is a major option for satisfying the global needs for energy and feedstocks. , In addition to its abundant reserves, natural gas releases lower amounts of greenhouse gas emissions in comparison with the rest of the fossil fuels. , Shale gas is a type of unconventional natural gas that can be an effective complement for renewable energies toward a sustainable energy transition. , Moreover, shale gas is abundant worldwide with a recoverable resource quantity equal to 7257 Tcf as well as relatively low exploitation costs . The main innovations that have achieved efficient large-scale exploitation of shale gas are horizontal drilling, hydraulic fracturing (fracking), fracture proppant to maintain fluid conductivity in fractures during production and the development of hydraulic fracturing fluids that drive proppant particles into fractures (prevent microbial growth and minimize formation damage). − One of the primary disadvantages of hydraulic fracturing is that it requires enormous amounts of freshwater and produces highly polluted flowback water streams, which may lead to the contamination of surface water and groundwater. , …”
This paper presents a novel mathematical programming
approach that
simultaneously incorporates a mixed-integer nonlinear programming
formulation with machine learning models to determine the operating
conditions, gas production, and optimal water management for the completion
phase in shale gas fields. The dataset for the development of an artificial
neural network model has been collected from the Eagle Ford Texas
formation. The total cumulative gas production and flowback water
generated in shale gas wells are selected as output variables. The
mathematical optimization model considers machine learning models
for each well, mass balances, treatment, storage, reuse, and disposal
options as well as well location selection and associated costs and
revenues from the sale of the shale gas produced. A case study has
been used to illustrate the benefits of the proposed approach. The
compromise solution offers a water consumption per produced energy
of 6.71 L/GJ in addition to the fact that 27% of the total fracture
water required can be obtained by reusing the flowback water with
attractive economic indicators.
“…Its share of emissions is expected to increase to 17% by 2050. 1,2 Therefore, the International Maritime Organization (IMO) aims to decarbonize shipping completely by 2050. 3 To this end, the maritime industry is seeking lowcarbon or zero-carbon alternatives (e.g., natural gas, biodiesel, ammonia, hydrogen, batteries) to the conventional Heavy Fuel Oil (HFO).…”
International Maritime Organization’s (IMO) 2020
regulation
was aimed to force the maritime industry to replace heavy fuel oil
with cleaner and sustainable bunkering fuels. Liquefied natural gas
(LNG) is a promising solution to achieving compliance with the established
emission standards. However, its cryogenic nature demands new infrastructures
and protocols for bunkering. Existing literature on LNG bunkering
focuses primarily on protocols, standards, and safety. In this study,
we present a comprehensive evaluation of the LNG bunkering procedure
in the world’s first national standard Technical Reference
56 (TR 56) using rigorous dynamic simulation. The bunkering time,
material costs, and emissions for truck-to-ship and ship-to-ship bunkering
are estimated. Bottom-filling operation is recommended for balancing
the pressures of two tanks and managing boiler-off gas (BOG) efficiently,
when a vapor return line is present. For leading maritime countries
such as Norway, Hong Kong, and Singapore, purging and inerting the
bunkering lines can impact emissions and material costs significantly.
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