Search

The study of the negative incidence of exploration - production activity on the atmospheric environment has not been systematically developed. The objective of this study has been to define technological and operational modifications to reduce emissions in oil deposits. To do this, a bibliographic update on the design and operation of flares on land, which covered the period of the last 15 years. The fundamental parameters of flames of those installed in the oil fields of the northern coast of the Mayabeque and Matanzas provinces estimated as a function of the exit speed of the chimneys, the stoichiometric ratio of mixing and the wind speed. The efficiencies of the flares installed in these oil fields are below 40%, which denoted poor combustion that can cause high levels of H2S throughout the region where they are located. The increase in combustion efficiency in vents can achieve by decreased gas flow and the increase in flame temperature and/or diameter. [ABSTRACT FROM AUTHOR]

Copyright of Espacio, Tiempo y Forma: Serie I, Prehistoria y Arqueología is the property of Editorial UNED and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Cuaternario y Geomorfología is the property of Cuaternario y Geomorfologia and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Boletin de Geologia is the property of Universidad Industrial de Santander and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

This work presents the mineralogical characterization of three ore bodies gold located in the northeast of the department of Antioquia, Colombia, which are currently benefited with mercury. Five tests were carried out on three gold deposits: determination of mineral species and analysis of false color images by QEMSCAN®; identification and quantification of gold by FE-SEM; fire analysis and cyanidation tests. The results by QEMSCAN showed that the ore bodies are mainly composed of quartz, potassium feldspar, muscovite and pyrite. The results by FE-SEM showed that gold is mainly found as nanoscopic nodules scattered in muscovite and quartz. Another amount of gold is in the form of electrum. The fire assay showed that the amount of gold was between 1 and 34 g/t and the cyanidation tests showed that it is possible to extract the gold up to 80% only with grinding and direct cyanidation without any other treatment. These results can be the basis for a proposal with alternative metallurgical methods that allow the extraction of gold without the use of mercury. [ABSTRACT FROM AUTHOR]

An inventory of the paleontological record of the coastal deposits of the Quaternary in Menorca is made from the bibliography. The island is not rich in deposits of fossil beaches and these are mostly on the coast S. The fossil record of marine-derived taxa is discrete and many thermophilic fossils have not been found. Molluscs are the most abundant to the detriment of other classes where the fossils are presented sparingly. Palaeosols and Eolianites are distributed throughout the coast of Menorca and the paleontological record is that of an island, a not very high number of terrestrial taxa with a high degree of endemism. The majority fossils are mollusks. [ABSTRACT FROM AUTHOR]

Copyright of Avances is the property of Instituto de Informacion Cientifica y Tecnologica and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

A new methodology for assessing the transient behavior of pressure generated by horizontal or tortuous wells in a petroleum reservoir is presented. Wells are explicitly represented in the diffusivity equation by a generalized function. For validation purposes, this mathematical, implicit model for measuring pressure is solved both analytically and numerically. While the analytical solution does match the Babu and Odeh (1989, 1994) proposal for horizontal wells, it is obtained by different mathematical methods. A new technique is submitted for the numerical solution that combines the Green’s function approach, and removing singularities methods with traditional fmite elements or differences schemes. This new computational approach yields square convergence in coarse gridls for 20 cases and very satisfactory results on 30 cases. The major contributions from this numerical method are its independence from the types of grid used in connection with the well’s geometric shape; flexibility to model horizontal well trajectorie’s of arbitrary geometry, and its applicability to arbitrary shaped reservoirs, as shown in the studied cases. [ABSTRACT FROM AUTHOR]

Copyright of Boletin de Geologia is the property of Universidad Industrial de Santander and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

This article about geopolitics and oil seeks to analyze the current international geopolitics in function of the oil variable. With the rise of the crude oil price up to almost 150 US dollars per barrel, the "black gold" has become an instrument for global power more than ever before. Furthermore, the increasingly urging demand for oil by China and India is pushing not only the hydrocarbon price but also the struggle for controlling the oil reservoirs around the world or at least having allied governments in power. Thus, under this logic, China has started an offensive to penetrate the African continent and this explains the amazing growth of the black continent. Last, this paper also shows that the catastrophic data on an impending shortage of the oil does not correspond with reality. In 1987, oil existence was forecasted for 40 years. Today, we have more oil than 20 years ago. [ABSTRACT FROM AUTHOR]