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Central European Geology
Authors: Péter Bajcsi, Tamás Bozsó, Róbert Bozsó, Gábor Molnár, Viktor Tábor, Imre Czinkota, Tivadar M. Tóth, Balázs Kovács, Félix Schubert, Gábor Bozsó, and János Szanyi

Our research team has developed a new well completion and rework technology involving lasers. The system is made up of a high-power laser generator and a custom-designed directional laser drilling head. The laser head is attached to a coiled tubing unit to maximize production and to carry out special downhole tasks. In this phase of the development effort, laser technology is particularly well suited to cost-efficiently drill short laterals from existing wells in a single work phase, drilling through the casing and cement as well as the formation. The technology, which is an extended perforation solution, enables a more intensive interaction with the downhole environment and supports cutting edge subsurface engineering scenarios such as barite removal. Laser-induced heat treatment appears to be a suitable alternative to effectively remove the almost immovable deposits and scales from thermal water-well pipes.

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Central European Geology
Authors: Imre Czinkota, János Szanyi, Balázs Kovács, András Sebők, Ildikó Hajdok, and Márton Papp

This paper aims at determining the behavior of thermal water brought to surface and how this might impact reinjection wells and the rock during reinjection. The biggest problem is that reinjection wells are predisposed to choking. We searched for a method to examine this process, including a model for physico-chemical changes in the water—rock interaction. Two different samples of powdered rock (designated α and β) were analyzed using thermal water samples from production and reinjection wells. The pH shows significant differences between the samples from wells where free water treatment was carried out, and those from the aerated thermal waters, as well as for the rock sample. Basically, a decrease in sediment volume can be obtained by increasing the pH. The salt effect was more coherent. Its result was an interesting case of W-shaped graphs from the producing well. On the other hand there is virtually no difference between the samples with acid titration.

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and styles of mineralization: variations and their causes, and guidelines for exploration . Journal of Geochemical Exploration , 36 : 445 – 474 . 10.1016/0375-6742(90)90063-G Yamada , H. and Nakazawa , H. ( 1993 ). Isothermal treatments of

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misidentified image segments following the segmentation treatment. These objects are mainly fluorescent mineral grains of nearly isometric shape. Due to the obvious difference of the shape of fractures and that of the nonlinear objects, these groups of pixels

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Central European Geology
Authors: István Vető, Katalin Báldi, Stjepan Ćorić, Magdolna Hetényi, Attila Demény, and István Futó

and determination of foraminifera Samples were soaked in hydrogen peroxide solution for several weeks. In spite of this aggressive treatment, samples taken from below 612 m did not disintegrate. Hence, only the upper two-thirds of the 697

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2012 database ( Copernicus Land Monitoring Service 2016b ). A cadaster of Hungarian wastewater treatment plants allowed for the calculation of point-source loads emitted to each river ( GDWM 2016b ). The emission values were divided by the long term

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basis of the Corine Land Cover 2012 database ( Copernicus Land Monitoring Service 2016b ). A cadaster of Hungarian wastewater treatment plants allowed for the calculation of point-source loads emitted to each river ( GDWM 2016b ). The emission values

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Central European Geology
Authors: Máté Zsigmond Leskó, Richárd Zoltán Papp, Boglárka Anna Topa, Ferenc Kristály, Tamás Vigh, and Norbert Zajzon

was measured after 350 and 550 °C heat treatment to observe structural collapse. The X-ray fluorescence (XRF) measurements were carried out using a Rigaku Supermini 200 wavelength-dispersive XRF spectrometer that was used with a 200 W Pd X

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Central European Geology
Authors: János Haas, Tamás Budai, István Dunkl, Éva Farics, Sándor Józsa, Szilvia Kövér, Annette E. Götz, Olga Piros, and Péter Szeitz

%) and HF (73%) treatment for dissolution of carbonates and silicates, and saturated ZnCl 2 solution ( D  ≈ 2.2 g/ml) for density separation. Residues were sieved at 15-μm mesh size. Slides have been mounted in Eukitt, a commercial, resin-based mounting

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lines following the undulation of the surface sculpture were clearly observed in thin sections (Fig.  9 ). As the multilayered tabular nature of fossil crocodilian eggshells is not always evident and may require special preservation, treatment, and

Open access