Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 20 for “"unconventional shale"”.
-
Low oil-water ratio invert emulsion mud for unconventional shale reservoirs
… used for drilling difficult formations such as shale, there is the necessity to develop an environmentally friendly drilling mud. Vegetable oils such as Jatropha have proven to be a comparable alternative to diesel oil. However, there have been concerns of compatibility of the vegetable oils …
-
Evaluating Leachability of Residual Solids Generated from Unconventional Shale Gas Production Operations in Marcellus Shale
Hydraulic fracturing operations utilized for shale gas production result in the generation of a large volume of flowback and produced water that contain suspended material, salts, hydrocarbons, metals, chemical additives, and naturally-occurring radioactive material. The water is impounded at …
-
Investigating the factors impacting the success of immiscible carbon dioxide injection in unconventional shale reservoirs: An experimental study
<p>"Unconventional shale reservoirs are currently gaining significant interest due to the huge hydrocarbon volumes that they bear. Enhanced oil recovery (EOR) techniques have been suggested to increase recovery from shale reservoirs. One of the most promising EOR methods is gas EOR (GEOR), most …
-
Wie lassen sich die wirtschaftlichen und volkswirtschaftlichen Chancen von Hydraulic Fracturing als unkonventionelle Fördermethode von Erdgas im Rahmen der Energiewende bewerten?
… According to current knowledge, the Posidonia Shale would be most suitable for an unconventional shale gas production using Hydraulic Fracturing (also known as fracking) in Germany. However, additional test drillings are required to determine further important parameters, such as the acid …
-
Evaluation of diagnostic fracture injection test (DFIT) and rate transient analysis (RTA) in Hereford field, northern DJ Basin
Since the inception of unconventional reservoir development in the United States, hydraulic fracturing and acidizing have become the primary techniques for stimulating these ultra-low permeability reservoirs. Furthermore, unlike conventional reservoirs, unconventional reservoirs require a much …
-
Characterisation of natural radioactivity in Karoo Basin groundwater prior to shale gas exploration
The prospect of unconventional shale-gas development in the Karoo Basin (South Africa) has created the need to obtain baseline data on natural radioactivity in Karoo groundwaters. The Karoo Basin groundwater radiological baseline developed through this study could serve as a reference to research …
-
Petrophysical facies mapping of the Pennsylvanian Cline Shale, Midland Basin, West Texas.
The Cline Shale is a Pennsylvanian unconventional shale resource play located in the Midland Basin, west Texas. This study evaluates the depositional, stratigraphic and petrologic controls on Cline Shale reservoir quality and their spatial distribution as determined from core-calibrated …
-
Unconventional gas exploration and regulating risks: what can Nigeria learn from western countries?
… therefore explore other energy options such as unconventional (shale) gas to remain relevant in the international oil and gas market. But whether unconventional (shale) gas can be exploited safely without causing severe damage to the environment and whether the environmental impact from fracking …
-
Transient multiphase flow simulation for unloading of frac hit gas wells
… occurs during hydraulic fracturing operations in unconventional wells. The effect of varying tubing depth and injection pressure are included in the study.</p><p>Results show that as the plastic viscosity increases, the nitrogen volume and time to unload will be increased. As tubing depth …
-
Investigation of Asphaltene Instability Under Gas Injection in Unconventional Reservoirs and its Impact on Oil Recovery Performance
<p>"Unconventional reservoirs, such as shale gas and tight oil formations, have become an important source of energy in recent years. However, these reservoirs often contain high levels of asphaltenes, which can lead to deposition and blockages in production wells and reduce the flow of …
-
Geomechanical review of hydraulic fracturing technology
Hydraulic fracturing as a method for recovering unconventional shale gas has been around for several decades. Significant research and improvement in field methods have been documented in literature on the subject. The heterogeneous nature of shale has made hydraulic fracturing design to be unique …
-
Mechanisms of fracture complexity and topology of fracture systems induced by hydraulic fracturing
… a prime factor controlling well performance in unconventional shale plays. In general, SRV describes the topology of induced fractures by hydraulic fracturing. Natural fractures (NFs), such as joints and faults, are ubiquitous in oil and gas reservoirs, where their tectonics, diagenesis, and …
-
Investigation of fluids flow behavior in nano-scale channels by using optic imaging system
"Tight gas and shale gas reservoirs are characterized to have small pores with diameters in nanometer (nm) range. The physics of fluid flow in nanopores is poorly understood. Knowing the fluid flow behavior in the nano-range channels is of major importance for stimulation design, gas production …
-
Prevalence, persistence and consequences of microorganisms within oil field environments and mitigation strategies
… have been performed on a limited number of unconventional shale formations in the United States (e.g., the Marcellus Formation) and do not represent the geological conditions in other unconventional formations. This work focuses on less studied unconventional tight formations in the Permian …
-
Integration of Nano CT and SEM in the Characterization of Marcellus Shale
Shale has proven to be a major unconventional natural gas play. However, due to its complex bedding orientations, comparatively high clay content and its complex heterogeneity, producing and optimising production is often hindered by its challenging complexities. It is now imperative to critically …
-
Modeling, imaging and waveform-inversion in attenuative anisotropic media
… imaging for locating microseismic sources in unconventional shale reservoirs. TR imaging is carried out with a viscoelastic VTI propagator based on fractional Laplacians, which is designed to decouple the influence of dissipation from that of dispersion. The obtained viscoelastic equations …
-
“Our Forever Home”: Loss of Place and Shale Gas Development in Western Pennsylvania
The Marcellus Shale is a sedimentary rock formation that lies beneath most of Pennsylvania as well as portions of Ohio, West Virginia, New York, and Maryland, and holds one of the world’s largest natural gas reserves. It has been known that the Marcellus is a sizeable gas reservoir, but until the …
-
Diagenetic, thermal and provenance histories of the Permian lower Ecca Group based on two newly drilled boreholes in the western and eastern main Karoo Basin, South Africa
… Africa have been identified to form a possible unconventional hydrocarbon reservoir, the gas potential of which is still relatively unknown. The lower Ecca Group is comprised of flysch-like successions of the Prince Albert, Whitehill and Collingham formations, which were impacted by diagenesis …
-
Borehole Breakouts in Transversely Isotropic Posidonia Shale
… drilling through finely laminated, organic rich shales (Økland and Cook, 1998; Ottesen, 2010; etc.); such instabilities should be avoided to assure a successful exploitation and safe production of the contained unconventional hydrocarbons. Borehole instabilities, such as borehole breakouts or …
-
Impacts of non-renewable resource extraction on shrubland songbird nest success and abundance
… currently experiencing prolific development of shale gas. Both of these practices alter local habitats and the landscape, and it is essential to understand their impacts on shrubland songbirds in order to inform conservation efforts for this declining guild. Research for this thesis was composed …