Publications
244 results found
Black L, Breen C, Yarwood J, et al., 2006, <i>In situ</i> Raman analysis of hydrating C<sub>3</sub>A and C<sub>4</sub>AF pastes in presence and absence of sulphate, 25th Cement and Concrete Science Conference, Publisher: MANEY PUBLISHING, Pages: 209-216, ISSN: 1743-6753
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- Citations: 61
Vladu CM, Hall C, Maitland GC, 2006, Flow properties of freshly prepared ettringite suspensions in water at LE 25 °C, JOURNAL OF COLLOID AND INTERFACE SCIENCE, Vol: 294, Pages: 466-472, ISSN: 0021-9797
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- Citations: 9
Black L, Breen C, Yarwood J, et al., 2006, Hydration of tricalcium aluminate (C3A) in the presence and absence of gypsum - studied by Raman spectroscopy and X-ray diffraction, Journal of Materials Chemistry, Vol: 16, Pages: 1263-1372, ISSN: 0959-9428
Davidson S, Maitland G, 2005, Process technologies: Pipe-dream meets reality, Chemical Engineer, Pages: 40-41, ISSN: 0302-0797
The research effort launched by Energy Futures Laboratory spans many types of power generation, including renewables like solar, wind, and waves; the decommissioning of the current generation of nuclear reactors and safe handling and storage of their wastes, and the design and construction of their possible replacements; the various types of biomass and strategies for extracting more of the energy content of crops; and the hydrogen economy, and how it will affect power grids. Geoffrey Maitland, professor of energy engineering at the Energy Futures Laboratory, is setting up collaboration with other researchers to tackle the problems of recovery and utilization of hydrocarbons. The first stage is to use modern sensors and instrumentation systems to see what is happening inside oil and gas wells. This basically amounts to using technology, which is well established in chemical plants - especially petrochemicals - and applying it in a much less ordered, and more arduous environment. Current research on process intensification systems is producing compact equipment, such as reactive distillation columns and combined heat exchanger/reactors, which can perform the functions of several pieces of conventional chemical engineering equipment within a very confined space. Such equipment can be used within the pipelines that bring the oil to the surface. The most extreme example of this is the processes done in refineries, according to Maitland. Other aspects of the technology will also require a multidisciplinary approach, particularly the concept of carbon capture and storage.
Colston SL, Barnes P, Jupe AC, et al., 2005, An in situ synchrotron energy-dispersive diffraction study of the hydration of oilwell cement systems under high temperature/autoclave conditions up to 130 °C, CEMENT AND CONCRETE RESEARCH, Vol: 35, Pages: 2223-2232, ISSN: 0008-8846
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- Citations: 21
Peleties F, Martin Trusler JP, Goodwin ARH, et al., 2005, Circulating pump for high-pressure and high-temperature applications, REVIEW OF SCIENTIFIC INSTRUMENTS, Vol: 76, ISSN: 0034-6748
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- Citations: 9
Croce V, Cosgrove T, Dreiss CA, et al., 2005, Giant micellar worms under shear: A rheological study using SANS, LANGMUIR, Vol: 21, Pages: 6762-6768, ISSN: 0743-7463
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- Citations: 95
Maitland G, 2005, Transforming 'formulation': systematic soft materials design, SOFT MATTER, Vol: 1, Pages: 93-94, ISSN: 1744-683X
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- Citations: 2
Couillet I, Hughes T, Maitland G, et al., 2005, Synergistic effects in aqueous solutions of mixed wormlike micelles and hydrophobically modified polymers, MACROMOLECULES, Vol: 38, Pages: 5271-5282, ISSN: 0024-9297
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- Citations: 68
Patel BH, Docherty H, Varga S, et al., 2005, Generalized equation of state for square-well potentials of variable range, MOLECULAR PHYSICS, Vol: 103, Pages: 129-139, ISSN: 0026-8976
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- Citations: 61
Briscoe BB, Cann PM, Delfino A, et al., 2005, Lubrication with water-based clay suspensions, Proceedings of the World Tribology Congress III - 2005, Pages: 529-530
The lubricating behaviour of a water-based rock drilling fluid (bentonite clay suspension) has been studied in a simple tribometer. Friction measurements were carried out with a model contact formed between a rotating shaft and a loaded planar counterface. The experiments were designed to investigate the tribology of the contact between the drillstring and the metal wall of an oilwell. Friction measurements were made for a range of loads and contact velocities and clay concentrations. The results are presented in the form of classical Stribeck-Hersey curves in order to identify the lubrication regime and to illustrate the combined effects of load and speed on the friction coefficient. Optical interferometry experiments were also carried out, using a ball-on-disc apparatus, in order to visualise the flow of the suspension through the contact. In a separate series of tests the interfacial shear stress of the mud formulations was measured for different contact metallurgies and operating conditions. Two basic lubrication regimes are identified: at high loads a regime characterised by the deposition of layers of solid clay onto the contacting surfaces and at low loads, a regime in which the main lubricating action is provided by the base fluid. In the transition between the two regimes, an intermediate region is characterised by changes in the fluid composition and rheology within the contact. The general trend of the Stribeck curve is obtained and a peculiar scattering of the data is evident in the region between the boundary lubrication regime and the mixed lubrication regime. The intrinsic nature and the complex rheology of the fluid appear to be the parameters that may control this effect and in part define the lubrication regime. Copyright © 2005 by ASME.
Croce V, Cosgrove T, Dreiss CA, 2004, Mixed spherical and wormlike micelles: A contrast-matching study by small-angle neutron scattering, LANGMUIR, Vol: 20, Pages: 9978-9982, ISSN: 0743-7463
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- Citations: 16
Croce V, Cosgrove T, Dreiss CA, et al., 2004, Mixed spherical and wormlike micelles: A contrast-matching study by small-angle neutron scattering, Langmuir, Vol: 20, Pages: 9978-9982, ISSN: 0743-7463
Small-angle neutron scattering studies were used to investigate the effect of adding an alcohol ethoxylate nonionic surfactant (d-C12E 20) to aqueous solutions of a cationic surfactant, erucyl bis(hydroxyethyl) methylammonium chloride (EHAC), with and without salt (KCl). The systematic use of contrast-matching, by alternately highlighting or hiding one of the surfactants, confirms that mixed micelles are formed. In salt-free solutions, mixed spherical micelles are formed and a core-shell model combined with a Hayter-Penfold potential was used to describe the data. The core radius is dominated by the EHAC tails and the outer radius determined by the ethoxylate headgroups of the nonionic surfactant. Addition of KCl promotes micellar growth; however, results of varying the solvent contrast revealed that when the nonionic surfactant is incorporated into the wormlike structure micellar breaking is promoted. Thus, mixed wormlike micelles with shorter contour lengths compared to the pure EHAC worms are formed.
Couillet I, Hughes T, Maitland G, et al., 2004, Growth and scission energy of wormlike micelles formed by a cationic surfactant with long unsaturated tails, LANGMUIR, Vol: 20, Pages: 9541-9550, ISSN: 0743-7463
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- Citations: 74
Croce V, Cosgrove T, Dreiss CA, et al., 2004, Impacting the length of wormlike micelles using mixed surfactant systems, LANGMUIR, Vol: 20, Pages: 7984-7990, ISSN: 0743-7463
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- Citations: 53
Croce V, Cosgrove T, Maitland G, et al., 2004, Erratum: Rheology, Cryogenic Transmission Electron Spectroscopy, and Small-Angle Neutron Scattering of Highly Viscoelastic Wormlike Micellar Solutions (Langmuir (2003) 19 (8536-8541)), Langmuir, Vol: 20, ISSN: 0743-7463
Croce V, Cosgrove T, Maitland G, et al., 2004, Rheology, cryogenic transmission electron spectroscopy, and small-angle neutron scattering of highly viscoelastic wormlike micellar solutions (vol 19, pg 8536, 2003), LANGMUIR, Vol: 20, Pages: 277-277, ISSN: 0743-7463
Maitland G, Sawdon C, Tehrani MA, 2004, Electrically conductive non-aqueous wellbore fluids, US6787505
Anderson VJ, Tardy, PMJC, et al., 2004, Extensional flow of wormlike micellar fluids (Article no.FE07), Seoul, Proceedings of XIVth Interantional Congress on Rheology, Seoul, Korea, Publisher: Korean Society of Rheology
Croce V, Cosgrove T, Maitland G, et al., 2003, Rheology, cryogenic transmission electron spectroscopy, and small-angle neutron scattering of highly viscoelastic wormlike micellar solutions, LANGMUIR, Vol: 19, Pages: 8536-8541, ISSN: 0743-7463
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- Citations: 168
Patel BH, Paricaud P, Galindo A, et al., 2003, Prediction of the salting-out effect of strong electrolytes on water plus alkane solutions, INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH, Vol: 42, Pages: 3809-3823, ISSN: 0888-5885
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- Citations: 94
Breen C, Clegg F, Maitland G, 2003, Treatment fluids and methods for consolidating substrates without simultaneous substantial loss of permeability, GB2375121
Maitland G, 2002, Overview, JOURNAL OF PETROLEUM TECHNOLOGY, Vol: 54, Pages: 50-50, ISSN: 0149-2136
Boek ES, Jusufi A, Löwen H, et al., 2002, Molecular design of responsive fluids:: molecular dynamics studies of viscoelastic surfactant solutions, JOURNAL OF PHYSICS-CONDENSED MATTER, Vol: 14, Pages: 9413-9430, ISSN: 0953-8984
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- Citations: 46
Deng CS, Breen C, Yarwood J, et al., 2002, Ageing of oilfield cement at high humidity: a combined FEG-ESEM and Raman microscopic investigation, Journal of Materials Chemistry, Vol: 12, Pages: 3105-3112, ISSN: 0959-9428
Maitland G, 2001, Overview, JOURNAL OF PETROLEUM TECHNOLOGY, Vol: 53, Pages: 38-38, ISSN: 0149-2136
Georgiadis A, 2001, Interfacial Tension of Aqueous and Hydrocarbon Systems in the Presence of Carbon Dioxide at Elevated Pressures and Temperatures
The interfacial tension of partially miscible phases, containing H2O andhydrocarbons in the presence of CO2 at elevated pressures and temperatures,has been studied within the context of producing cleaner fossil fuelsby simultaneously tackling greenhouse gas emissions. This is a most relevantproperty inuencing the multiphase reservoir ows associated withenhanced oil recovery (EOR), and carbon capture and storage (CCS). Themain core of the thesis focuses on the experimental investigation of thedependence of interfacial tension on pressure and temperature, for variousmixtures of pure substances relevant to oil- eld conditions and uids. Forthis purpose, a high pressure high temperature (HPHT) apparatus, comprisinga view cell, high pressure capillary tubing connections, and appropriateuid delivery syringe pumps, was used over an operating temperaturerange of (298 to 473)K and at pressures up to 60MPa. The apparatusimplemented the pendant drop method, well suited for the accuratedetermination of uid/liquid interfacial tensions at elevated pressures andtemperatures, linked to a computer-aided drop shape analysis (DSA) system.Measurements were made over a wide range of conditions for the twophasesystems (H2O+CO2), (n-decane+CO2), (n-dodecane+CO2), (n-hexadecane+CO2), (H2O+n-decane) and (H2O+[n-decane+CO2]). Thedi erent isotherms recorded for each system demonstrated systematic trendswith increasing pressure, while the decrease of interfacial tension with temperatureobserved at ambient pressures was usually reversed at elevatedpressures. For the (H2O+CO2) system in particular, the pressure dependenceof interfacial tension demonstrated abrupt changes at certain conditions,associated with the onset of the liquid or supercritical states, abovewhich the interfacial tension was less sensitive to changes in both pressureand temperature. This was not the case for the (n-alkane+CO2) systems,where the interfacial tension reduced with increasing pressure, vanishing asthe two phases be
Pafitis DG, Maitland GCD, Davies SN, 2001, Thixotropic materials suitable for oilwell applications, US6279655
Briscoe BJ, Cann PM, Delfino A, et al., 2001, Lubrication of water-based clay suspensions, Holland, Symposium on Tribology research: from model experiment to industrial problem, Lyon, France, September 2000, Publisher: Elsevier, Pages: 331-340
Tehrani MA, Davies SNM, Maitland G, 2001, Setting composition for well operations, GB2317896;US6177483
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