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<article article-type="research-article" dtd-version="1.3" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xml:lang="en"><front><journal-meta><journal-id journal-id-type="publisher-id">gscience</journal-id><journal-title-group><journal-title xml:lang="en">Mining Science and Technology (Russia)</journal-title><trans-title-group xml:lang="ru"><trans-title>Горные науки и технологии</trans-title></trans-title-group></journal-title-group><issn pub-type="epub">2500-0632</issn><publisher><publisher-name>The National University of Science and Technology MISiIS (NUST MISIS)</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.17073/2500-0632-2021-1-42-51</article-id><article-id custom-type="elpub" pub-id-type="custom">gscience-264</article-id><article-categories><subj-group subj-group-type="heading"><subject>Research Article</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>MINERAL RESOURCES EXPLOITATION</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="ru"><subject>РАЗРАБОТКА МЕСТОРОЖДЕНИЙ ПОЛЕЗНЫХ ИСКОПАЕМЫХ</subject></subj-group></article-categories><title-group><article-title>Methods and technical solutions for keeping the path of a geotechnological borehole</article-title><trans-title-group xml:lang="ru"><trans-title>Методы и технические решения повышения надежности удержания трассы геотехнологической скважины</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Молдаши</surname><given-names>Д. Н.</given-names></name><name name-style="western" xml:lang="en"><surname>Moldashi</surname><given-names>D. N.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Динмухамед Нурболович Молдаши – председатель правления</p><p>г. Алматы</p></bio><bio xml:lang="en"><p>Dinmukhamed N. Moldashi – Chairman of the Board</p><p>Almaty</p></bio><email xlink:type="simple">priemnaya@vg.kazatomprom.kz</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru">АО «Волковгеология» (НАК «Казатомпром»)<country>Казахстан</country></aff><aff xml:lang="en">Volkovgeologia JSC (NAC Kazatomprom)<country>Kazakhstan</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2021</year></pub-date><pub-date pub-type="epub"><day>06</day><month>04</month><year>2021</year></pub-date><volume>6</volume><issue>1</issue><fpage>42</fpage><lpage>51</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Moldashi D.N., 2021</copyright-statement><copyright-year>2021</copyright-year><copyright-holder xml:lang="ru">Молдаши Д.Н.</copyright-holder><copyright-holder xml:lang="en">Moldashi D.N.</copyright-holder><license license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>This work is licensed under a Creative Commons Attribution 4.0 License.</license-p></license></permissions><self-uri xlink:href="https://mst.misis.ru/jour/article/view/264">https://mst.misis.ru/jour/article/view/264</self-uri><abstract><p>With increasing depth of exploration and process boreholes (at small drilling diameters), the probability of deviation of the borehole path from design trajectory increases many times; i. e. zenith curvature and azimuth deviation of the borehole path occur. Therefore, developing methods for keeping vertical path of the borehole when drilling deeper horizons of ore bodies is a very topical issue. The paper presents the results of developing a new bottom-hole assembly for drilling boreholes in soft rocks using screw casing centralizers, which provide good stabilizing and centering effects to mitigate horizontal departure of the hole axis from the design direction and minimize vertical curvature of the hole path (zenith angle) while maintaining sufficient drill string flexibility. The developed technical solutions provide simplicity of design and ability to adapt to wide range of mining, geological and technological drilling conditions. The feasibility of manufacturing the centralizers by own efforts and the technological feasibility of quick and easy connecting the centralizer with other elements of the bottom-hole assembly have been substantiated. The manufacture efficiency is proved by the use of inexpensive and wear-resistant materials in the centralizer armouring, for which tungsten-cobalt or titanium-cobalt hard-alloy inserts were used. In addition, prevailing volume of borehole drilling in soft rocks allowed using replaceable centering elements, as well as their repair and restoration to increase their service life. The manufactured centralizer has a low production cost due to the design simplicity and the use of inexpensive wearresistant material and will compete in the market of drilling tools and technical devices for drill string stabilization. The economic effect from the introduction of the self-produced centralizers amounted to more than 170,000 tenge per a borehole.</p></abstract><trans-abstract xml:lang="ru"><p>С увеличением глубины разведочных и технологических скважин при малых диаметрах бурения многократно возрастает вероятность отклонения трассы скважин от заданной траектории, т.е. происходит искривление трассы скважины по зениту и отклонение по азимуту. Поэтому применение способов удержания трассы скважины по вертикали при бурении более глубоких горизонтов рудных тел – вопрос очень актуальный. В работе представлены результаты разработки новой компоновки низа буровой колонны для бурения скважин в мягких горных породах с использованием винтовых центраторов, позволяющих обеспечить хорошие стабилизирующие и центрирующие воздействия, необходимые для уменьшения горизонтального смещения оси скважины от заданного направления, и уменьшение искривления трассы скважины по вертикали (зенитного угла) при сохранении достаточной гибкости буровой колонны. Разработанные технические решения отличаются простотой конструкции и возможностью адаптации к широкому диапазону горно-геологических и технологических условий бурения. Обоснованы возможность изготовления центраторов собственными производственными мощностями и технологическая возможность быстрого и легкого соединения с другими элементами низа буровой колонны. Эффективность производства доказана использованием в армировке центраторов недорогих по стоимости и износостойких материалов, в качестве которых были применены твердосплавные вольфрам-кобальтовые или титан-кобальтовые вставки. Кроме того, преобладающий объем бурения скважин в мягких горных породах позволил предусмотреть использование сменных центрирующих элементов, а также возможность ремонта и реставрации для увеличения срока службы, производственного ресурса и повторной эксплуатации. Изготовленный центратор имеет низкую себестоимость производства за счет простоты конструкции и применения недорогого износостойкого материала и составит достойную конкуренцию на рынке буровых инструментов и технических средств для стабилизации бурильной колонны. Экономический эффект от внедрения центраторов собственного производства на 1 (одну) скважину составил более 170 000 тенге.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>горные породы</kwd><kwd>бурение</kwd><kwd>разведочные скважины</kwd><kwd>технологические скважины</kwd><kwd>добыча урана</kwd><kwd>Казахстан</kwd></kwd-group><kwd-group xml:lang="en"><kwd>rocks</kwd><kwd>drilling</kwd><kwd>exploration borehole</kwd><kwd>technological borehole</kwd><kwd>uranium mining</kwd><kwd>Kazakhstan</kwd></kwd-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Ракишев Б. Р., Федоров Б. В. Техника и технология сооружения геотехнологических скважин. Алматы; 2013. 260 с.</mixed-citation><mixed-citation xml:lang="en">Rakishev B. R., Fedorov B. V. Technique and process for the construction of geotechnological boreholes. Аlmaty; 2013. 260 p. 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