Development of Model of Proactive Management of Refineries' Equipment Restoration

The article considers the topic of maintenance of equipment in a working condition in the activities of oil producing enterprises. The exploitation of the means of labor takes place in difficult mining, geological and climatic conditions. Ensuring the reliability and efficiency of the surface and underground equipment operation is a priority task for the oil producing enterprises of the Russian Federation. In modern economic conditions, there is a need to improve the efficiency of work on the restoration of equipment.

Analytical review of underground equipment of water impact operation for well development

Rational indicators for the development of oil and gas fields are related to the systemic maintenance of a given level of perfection of formation opening in bottomhole zones of producing or injection wells. This need arises with the colmatation of the natural collector by mechanical, asphalt and tar-paraffinic particles, leading to a decrease in productivity, acceptance of wells and the need to restore the inflow by methods of artificial action on the bottomhole formation zone. Analysis of the effectiveness of the application of various methods of stimulating the flow of reservoir products in the fields of the Timan-Pechora oil and gas province (based on field data) allowed to argue the success of using hydraulic fracturing, thermogas chemical, and shock-depressive effects on the bottomhole formation zone. The prospect of the development of technical means for impact-depressive (implosion) impact on the bottomhole formation zone favorably distinguished by simplicity, cheapness, manufacturability and accessibility is shown. The designs of implosion hydrogenerators of single and multiple pressure are analyzed, shortcomings of technical devices are identified and ways of improving mechanisms are outlined. The results of effective application of various downhole generator devices for increasing productivity and well acceptance are presented.

TECHNOLOGY FOR PREVENTION AND REMOVAL OF ORGANIC SALTS FROM THE MESOZOIC WELLS OF THE CHECHEN REPUBLIC

Основными проблемами, осложняющими эксплуатацию глубоких скважин (на определенной стадии разработки), являются низкие коллекторские свойства пластов и отложения в призабойной зоне пласта (ПЗП) и подземном оборудовании органических солей, то есть высокоплавких асфальтено-смолистых веществ (АСВ). Это приводит к существенному уменьшению добычи нефти, вплоть до полного прекращения притока из пласта, затрудняет, а в ряде случаев и полностью исключает, возможность проведения глубинных термогидродинамических исследований скважин и мероприятий по воздействию на призабойную зону пласта, вызывает необходимость в дополнительных затратах, связанных со сбором, транспортировкой и подготовкой нефти, что ухудшает технико-экономические показатели разработки нефтяных залежей. Для борьбы с указанными осложнениями разработаны и используются в нефтепромысловой практике большое количество технологических методов и реагентов на базе растворителей фирмы «РИНГО», ингибиторов и растворителей института «Союзнефтепромхим» (СНПХ-7909, СНПХ- 7941, СНПХ-7920М) и другие. Однако указанные реагенты и технологические схемы предназначены для обработок неглубоких скважин, где основную массу отложений составляют соединения парафинового ряда. В условиях отложения высокомолекулярных АСВ они малоэффективны или неприемлемы. В этой связи для условий глубоких высокотемпературных асфальтено-смолообразующих скважин разработаны специальные технологии обработок ПЗП и НКТ. Технология предусматривает использование для удаления и ингибирования отложений АСВ составов, включающих ароматические и предельные углеводороды, поверхностно-активные вещества (ПАВ), а также водные растворы гидратов окиси или силикатов щелочных металлов. Применение смеси растворителей с различной молекулярной структурой основано на различном характере растворимости асфальтено-смолистых и парафиновых веществ. Разработанная технология внедрена на мезозойских скважинах ОАО «Грознефтегаз», что позволило обеспечить безаварийный спуск глубинных приборов для проведения термогидродинамических исследований и значительно увеличить производительность скважин и дополнительно добыть десятки тысяч тонн нефти. The main problems that complicate the operation of deep wells (at a certain stage of development) are low collector properties of formations and deposits in the bottom-hole zone of the formation (PCP) and underground equipment of organic salts, i.e. high-melting asphalteno-resinous substances (ASV). This leads to a significant reduction in oil production, up to the complete termination of the inflow from the formation, makes it difficult, and in some cases completely impossible, to carry out deep thermohydrodynamic studies of wells and measures for impact on the bottom-hole zone of the formation, causes the need for additional costs related to the collection, transportation and preparation of oil, which impairs the technical and economic indicators of development of oil deposits. In order to combat these complications, a large number of technological methods and reagents based on RINGO solvents, inhibitors and solvents of Soyuzneftepromchim Institute (СНПХ-7909, СНПХ-7941, СНПХ-7920М) and others have been developed and used in oil field practice. However, these reagents and process diagrams are designed to treat shallow wells where the bulk of the deposits are paraffin series compounds. Under conditions of deposition of high-malecular ACB, they are ineffective or unacceptable. In this regard, for conditions of deep high-temperature asphalt-resin- forming wells special technologies of treatment of PIP and tubing have been developed. The technology involves the use of compositions comprising aromatic and marginal hydrocarbons, surfactants and aqueous solutions of alkali metal hydroxide or silicate to remove and inhibit ACB deposits. The use of a mixture of solvents with different molecular structures is based on the different solubility of asphalteno- resinous and paraffinic substances. The developed technology was introduced at the Mesozoic wells of OAO Grozneftegas, which allowed to ensure the accident-free descent of deep instruments for thermohydrodynamic research and significantly increase the productivity of wells and additionally produce tens of thousands of tons of oil.

Identification of occupational risk for arterial hypertension. 1: elimination of the modifyng influence of factors of cardiovascular risk

On results of research in 13 occupational groups (3842 workers, men) there were performed an analysis of a contribution of non-occupational factors of cardiovascular risk (FCVRs) and the elimination of their modifying influence on risks for the development of the arterial hypertension (AH). In the capacity of non-occupational FCVRs there were considered 16 predictors of AH. There were calculated the relative risk of AH and 95% the confidential interval (CI) in occupational groups on benchmark data of the prevalence rate of AH and after the elimination of the modifying influence of FCVRs. Reference group was the general sample, that is, all the occupations. Modifying influence of FCVR was eliminated by means of direct standardization. With the aid of trees of classification from the number of FCVRs in occupational groups the presence of obesity and age of the worker (respectively, 100 and 78 conditional points) was shown to have the maximum impact on the development of AH. Elimination of the influence of data of FCVRs led to the change of benchmark values of occupational risks of AH in the average for 10%, in four occupations level of the statistical importance of risks of AH changed. In top-managers, and also in operating personnel and technical workers the risk for AH from the high decreased to not significant, respectively to 1,00 at 95%, CI: 0,74-1,36 and 1,20 at 95%, CI: 0,97-1,49. On the contrary, the risk for AH increased from low to statistically not significant in underground equipment operators (0,85 at 95%, CI: 0,71-1,01) and labourers (0,89 at 95%, CI:0,69-1,14).

GPR Survey on an Iron Mining Area after the Collapse of the Tailings Dam I at the Córrego do Feijão Mine in Brumadinho-MG, Brazil

This article shows the interesting results of a pioneer effort by IAG/USP researchers to use ground-penetrating radar (GPR) for humanitarian purposes, guiding the rescue of victims in the tragedy of Brumadinho. The tailings Dam I at the Córrego do Feijão iron ore mine, located in the Brumadinho complex, Minas Gerais State, Brazil, collapsed on 25 January 2019. About 11.7 million m3 of mining mud was spilled from the dam, burying bodies, equipment, structural buildings, buses, and cars along a length of 8.5 km up to the Paraopeba River. Additionally, the contaminated mud traveled more than 300 km along the bed of the Paraopeba River toward the São Francisco River. This work shows the results of a geophysical investigation using the GPR method 17 days after the event. To carry out the geophysical survey, an excavator was used for soil compaction. The data acquisition was performed on the tracks left by the excavator chain using SIR-4000 equipment and antennas of 200 and 270 MHz (GSSI). The GPR studies aimed to map bodies, structural buildings, and equipment buried in the mud. The location of the profiles followed preferably the edge of the slope due to the higher probability of finding buried bodies and objects. The GPR results allowed the detection of subsoil structures, such as concentrations of iron ore and accumulations of sand from the dam filter. The GPR was effective because the iron ore sludge in the mixing process became porous and the pores were filled with air, which provided penetration and reflection of the GPR electromagnetic waves up to a depth of 3.5 m. The results were surprising. Although no bodies or underground equipment were found, the results of this research served to eliminate the studied areas from future excavations, thus redirecting the rescue teams and optimizing the search process. These important results can serve as an additional motivation for the use of GPR in future humanitarian work in areas of tragedies.

PORTABLE PRESSURE RECORDER AT COMPLEX «HYDROFRACTURING» FOR EXPERIMENTAL STRESS DETERMINATION IN THE SOLID

Measuring and computing complex “Hydrofracturing” is mobile and aimed for determination of acting in solid stresses by method of measuring hydraulic fracturing. In the paper, approaches to re-equipment of the complex considering actual requirements to the applied underground equipment and possibilities of modern microprocessing facilities, are justified. New software and hardware solutions and functioning features of portable pressure recorder are considered based on microprocessing system of conversion analog signal coming from pressure sensor and control signal of battery voltage of autonomous device for experiment operating. Spark safe method of switching of electronic scheme of the device is proposed where there is reed switch of supply circuits with scheme of smooth start. It prevents fritting of the reeds. It is proposed to apply wireless scheme of charging of inside battery. Absence of detachable connections in structure of the portable pressure recorder prevents negative impact of high humidity in the atmosphere coal and ore mines on its functioning. Also, it excludes the possibility of spark formation.