Preprints

Filtering by Subject: Oil, Gas, and Energy

A quantitative assessment of the hydrogen storage capacity of the UK continental shelf

Jonathan Scafidi, Mark Wilkinson, Stuart M. V. Gilfillan, Niklas Heinemann, R. Stuart Haszeldine

Published: 2020-11-19
Subjects: Oil, Gas, and Energy

Increased penetration of renewable energy sources and decarbonisation of the UK's gas supply will require large-scale energy storage. Using hydrogen as an energy storage vector, we estimate that 150 TWh of seasonal storage is required to replace seasonal variations in natural gas production. Large-scale storage is best suited to porous rock reservoirs. We present a method to quantify the hydrogen [...]

Closing the gap: Explaining persistent underestimation by US oil and natural gas production-segment methane inventories

Jeffrey S Rutherford, Evan D Sherwin, Arvind P Ravikumar, Garvin A Heath, Jacob Englander, Daniel Cooley, David Lyon, Mark Omara, Quinn Langfitt, Adam R Brandt

Published: 2020-11-03
Subjects: Environmental Indicators and Impact Assessment, Oil, Gas, and Energy

Methane (CH4) emissions from oil and natural gas (O&NG) systems are an important contributor to greenhouse gas emissions. In the United States (US), recent synthesis studies of field measurements of CH4 emissions at different spatial scales are ~1.5x-2x greater compared to official Environmental Protection Agency (EPA) greenhouse gas inventory (GHGI) estimates. Site-level field studies have [...]

The Global Warming Potential Misrepresents the Physics of Global Warming Thereby Misleading Policy Makers

Robert L Kleinberg

Published: 2020-10-25
Subjects: Atmospheric Sciences, Environmental Sciences, Oil, Gas, and Energy

The Global Warming Potential (GWP) is a widely used metric used to compare the climate change effects of various greenhouse gases. Although GWP has an established role in international climate agreements, GWP does not, in general, describe any specific identifiable impact of greenhouse gas emissions on climate. It is argued here that GWP is unphysical, unintuitive, arbitrary, ignores the time [...]

The Paradox of Increasing Initial Oil Production but Faster Decline Rates in Fracking the Bakken Shale: Implications for Long Term Productivity of Tight Oil Plays

Frank Male, Ian J Duncan

Published: 2020-10-21
Subjects: Oil, Gas, and Energy, Petroleum Engineering

In the US, tight oil is the largest source of liquid hydrocarbons and has driven the country to become the world’s largest oil producer. Eventually many countries will likely be producing very large quantiles of tight oil. However, how robust is tight oil production? The answer to this question will have an impact on the future geographic spread of oil production and will have geopolitical [...]

Bridging the gap between geophysics and geology with Generative Adversarial Networks (GANs)

Suihong Song, Tapan Mukerji, Jiagen Hou

Published: 2020-08-16
Subjects: Artificial Intelligence and Robotics, Computer Sciences, Databases and Information Systems, Earth Sciences, Environmental Monitoring, Environmental Sciences, Geology, Geomorphology, Geophysics and Seismology, Natural Resource Economics, Oil, Gas, and Energy, Other Earth Sciences, Physical Sciences and Mathematics, Sedimentology, Water Resource Management

Inverse mapping from geophysics to geology is a difficult problem due to the inherent uncertainty of geophysical data and the spatially heterogeneous patterns (structure) in geology. We describe GANSim, a type of generative adversarial networks (GANs) that discovers the mapping between remotely-sensed geophysical information and geology with realistic patterns, with a specially designed loss [...]

Fracture mechanics of rate-and-state faults and fluid injection induced slip

Dmitry Garagash

Published: 2020-07-08
Subjects: Earth Sciences, Engineering, Environmental Sciences, Geophysics and Seismology, Oil, Gas, and Energy, Physical Sciences and Mathematics, Physics

Propagation of a slip transient on a fault with rate-and-state dependent friction resembles a fracture which near tip region is characterized by large departure of the slip velocity and fault strength from the steady-state sliding. We develop a near tip solution to describe this unsteady dynamics, and obtain the fracture energy Gc, dissipated in overcoming strength-excursion away from [...]

An agent-based model for estimating emissions reduction equivalence among leak detection and repair programs

Thomas A. Fox, Mozhou Gao, Thomas E. Barchyn, Yorwearth L. Jamin, Chris H. Hugenholtz

Published: 2020-07-01
Subjects: Environmental Sciences, Oil, Gas, and Energy, Physical Sciences and Mathematics

Alternative leak detection and repair (alt-LDAR) programs are being introduced by regulators in North America to provide flexibility in how oil and gas producers manage their fugitive methane emissions. However, emissions reduction equivalence must be established between a proposed program and a regulatory standard. We present LDAR-Sim, an open-source, agent-based numerical model for estimating [...]

Turbulent flow effects in a slickwater fracture propagation in permeable rock

Evgenii Kanin, Dmitry Garagash, Andrei A. Osiptsov

Published: 2020-06-18
Subjects: Earth Sciences, Environmental Sciences, Hydrology, Oil, Gas, and Energy, Physical Sciences and Mathematics, Volcanology

This work is devoted to an analysis of the near-tip region of a hydraulic fracture driven by slickwater in a permeable saturated rock. We consider a steady-state problem of a semi-infinite fracture propagating with constant velocity. The host rock is elastic and homogeneous, and fracture propagates according to linear elastic fracture mechanics. The fluid exchange between the fracture and [...]

Methane concentrations in streams reveal gas leak discharges in regions of oil, gas, and coal development

Josh Woda, Tao Wen, Jacob Lemon, Virginia Marcon, Charles M. Keeports, Fred Zelt, Luanne Y. Steffy, Susan L. Brantley

Published: 2020-06-18
Subjects: Earth Sciences, Environmental Indicators and Impact Assessment, Environmental Monitoring, Environmental Sciences, Geochemistry, Oil, Gas, and Energy, Physical Sciences and Mathematics, Water Resource Management

As natural gas has grown in importance as a global energy source, leakage of methane (CH4) from wells has sometimes been noted. Leakage of this greenhouse gas is important because it affects groundwater quality and, when emitted to the atmosphere, climate. We hypothesized that streams might be most contaminated by CH4 in the northern Appalachian Basin in regions with the longest history of [...]

A radial hydraulic fracture with pressure-dependent leak-off

Evgenii Kanin, Egor Dontsov, Dmitry Garagash, Andrei A. Osiptsov

Published: 2020-05-06
Subjects: Earth Sciences, Environmental Sciences, Hydrology, Oil, Gas, and Energy, Physical Sciences and Mathematics, Volcanology

This paper investigates the problem of a radial (or penny-shaped) hydraulic fracture propagating in a permeable reservoir. In particular, we consider the fluid exchange between the crack and ambient porous media as a pressure-dependent process. In most of the existing models, the fluid exchange process is represented as one-dimensional pressure-independent leak-off described by Carters law. We [...]

Cascading Failure Phenomenon in the Multi-Stage Hydraulically Fractured Wells

Konstantin Sinkov, Dimitry Chuprakov, Maxim Chertov, Dean Willberg, Pavel Spesivtsev

Published: 2020-04-13
Subjects: Environmental Sciences, Oil, Gas, and Energy, Physical Sciences and Mathematics

The phenomenon of cascading fracture failure during flowback and initial production from a horizontal multistage hydraulically fractured well is introduced, described, and investigated. First, a simplified analytical model of production from such well is built. This model allows evaluating a range of systems parameters through which the cascading failure evolves and performing a sensitivity study [...]

Policy Bridge: Air Quality Impacts from Oil and Natural Gas Development in Colorado

Detlev Helmig

Published: 2019-12-12
Subjects: Environmental Education, Environmental Health and Protection, Environmental Monitoring, Environmental Sciences, Oil, Gas, and Energy, Physical Sciences and Mathematics

The rise of hydraulic fracturing techniques has fostered rapid growth of oil and natural gas extraction in areas across the United States. In the Denver-Julesburg Basin (DJB), which mostly overlaps with Weld County in the Northern Colorado Front Range (NCFR) north of the City of Denver Metropolitan Area (DMA), the well drilling has increasingly approached, and in many instances moved into urban [...]

Detection and temperature estimation of gas flares with nocturnal Landsat OLI

Ruiwen Lee, Christopher Small

Published: 2019-11-02
Subjects: Earth Sciences, Environmental Sciences, Oil, Gas, and Energy, Physical Sciences and Mathematics

Natural gas flaring is a worldwide polluting activity carried out during oil production. Satellite imagery has emerged as a low-cost, objective tool to measure and monitor gas flaring. Since 2012, hectometre-resolution infrared imagery from the Suomi NPP VIIRS sensor has been used to operationally monitor global gas flaring (Elvidge et al. 2016). Since 2013, nocturnal acquisitions of Landsat 8 [...]

Verifying pore network models of imbibition in rocks using time-resolved synchrotron imaging

Tom Bultreys, Kamaljit Singh, Ali Q. Raeini, Leonardo C. Ruspini, Pål-Eric Øren, Steffen Berg, Maja Rücker, Branko Bijeljic, Martin J. Blunt

Published: 2019-10-25
Subjects: Earth Sciences, Environmental Sciences, Hydrology, Oil, Gas, and Energy, Physical Sciences and Mathematics

At the pore scale, slow invasion of a wetting fluid in porous materials is often modelled with quasi-static approximations which only consider capillary forces in the form of simple pore filling rules. The appropriateness of this approximation, often applied in pore network models, is contested in literature, reflecting the difficulty of predicting imbibition relative permeability with these [...]

The near-tip region of a hydraulic fracture with pressure-dependent leak-off and leak-in

Evgenii Kanin, Dmitry Garagash, Andrei A. Osiptsov

Published: 2019-09-03
Subjects: Earth Sciences, Engineering, Environmental Sciences, Hydrology, Oil, Gas, and Energy, Physical Sciences and Mathematics, Volcanology

This paper is concerned with an analysis of the near tip region of a propagating fluid-driven fracture in a saturated permeable rock. The study attempts to accurately resolve the coupling between the physical processes - rock breakage, fluid pressure drop in the viscous fluid flow in the fracture, and fluid exchange between fracture and the rock - that exert influence on the hydraulic fracture [...]

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