Article is devoted to creation of new compositions of process solutions for lining of directional wells at high temperatures. Developed compositions provide high durability characteristics of cement stone. It is shown that with an increase in packing density of cementing slurry components durability characteristics increase and porosity and permeability of cement stone decrease, whereas an increase in temperature and pressure leads to a significant increase in compressive and bending durability, which is associated with presence of quartz in them. It has been established that introduction of special structure-forming additives to the composition of developed cementing solutions allows formation of sedimentation-resistant cement systems that can provide an increase in durability characteristics of cement stone and, in general, quality lining of directional wells. Study of rheological properties of developed cementing compositions showed that the systems have high yield strength at increased temperatures and pressures. Developed compositions of water-based spacer fluids increase the cleansing degree for both casing and rocks surfaces from mud and clay cake residues, which improves the cementing quality of oil and gas wells. Mechanism for increasing the washing ability of spacer fluids and durability characteristics of cement stone, depending on composition and properties of their constituent components, is disclosed.
The article deals with the peculiarities of engineering geological and hydrogeological conditions in the paleovalley zone in northwestern part of St. Petersburg. The paper focuses on the main aspects of complex development of underground space of heterogeneous zones.
The article describes the features of geomorphological and geological-structural construction, engineering-geological and hydrogeological conditions of Primorskiy part of Saint Petersburg. There are describe a geological section of rocks of the Quaternary, given hydrochemical characteristic for typification and zoning of development areas of construction.
Проблемы рекультивации земель, нарушенных в результате разработки месторождений полезных ископаемых, занимают приоритетное положение в современных исследованиях по рациональному использованию природных ресурсов. Рассмотрен подход к решению данной проблемы с позиции инженерной геологии.
Новая инновационная программа Горного института предусматривает организацию круглогодично действующего полигона в пос.Кавголово Ленинградской области. На нем планируется строительство новых корпусов для обучения и проживания студентов. Для осуществления строительства проведены исследования силами сотрудников кафедры гидрогеологии и инженерной геологии СПГГИ (ТУ) совместно с изыскательской организацией «СУ-299». На основании анализа архивных и литературных источников и результатов изысканий оценены инженерно-геологические условия и гидрогеологическое строение полигона, получены показатели физико-механических свойств песчано-глинистых пород основания проектируемых зданий. Материалы будут использованы при проведении учебной практики со студентами специальности «Поиски и разведка подземных вод и инженерно-геологические изыскания».
On the basis of the general engineering-geological typification of mineral deposits V.D. Lomtadze proposes to build a typification taking into account the difficulties of reclamation of the consequences of open pit or underground mining. Typification can be used at the stage of designing a mining enterprise with inclusion of physical and biological reclamation of disturbed lands into the project.
