Trying to learn how to translate from the human translation examples.
From professional translators, enterprises, web pages and freely available translation repositories.
estos inconvenientes se suman a los habituales de la perforación de taladros en capas fuertemente grisuosas o con carbones muy blandos, donde existe peligro de pérdida de materiales y, en todo caso, dificultad de obtener cementaciones estancas de los taladros.
added to these disadvantages are those which usually occur when holes are drilled in seams containing high levels of mine gas or high proportions of very friable coal, where there is a risk of equipment loss and where at least difficulties are encountered in obtaining tight seals in cemented holes.
método de obturación eficaz y operativa de los taladros de inyección de agua, especialmente en yacimientos grisuosos y en zona microfisurada.
an effective and workable method of sealing injection holes, especially in gassy seams and in microfissured zones.