The calculation algorithm of the operating mode of production well for concentric lift columns in conditions of the accumulation of liquid at the bottom


Abstract: The article proposes a solution to the problem of operating wells at the bottom of which fluid accumulates during the production of reservoir products (using the example of producing wells of the Cenomanian deposit of the Urengoy oil and gas condensate field of Gazprom Dobycha Urengoy LLC, Russia). It is shown that traditionally this field problem is solved by carrying out underground repairs, which creates the risk of the wells not being brought back to the initial parameters, primarily in terms of flow rate. It was also noted that it becomes impossible to operate the wells of the Cenomanian deposit in the conditions of the collapse of the bottom-hole zone of the reservoir with the periodic shutdown of the gas flow from the annulus. The solution to this type of complication in the wells of the Cenomanian deposit of the Urengoy oil and gas condensate field is to transfer the wells to operation using concentric lift columns. This relatively new innovative technology allows for the removal of liquid from the bottom together with gas, thereby avoiding closing the well and its subsequent repair, as well as possible stimulating treatments to restore the necessary flow. The conditions of the transition to the operation of wells in concentric lift columns with the aim of removal of the liquid phase by the gas stream are considered. The methodology for calculating the operating mode of the well of the Urengoyskoye field using concentric lift columns is considered with the aim of ensuring the removal of liquid from the bottom using the software package. It is shown that by calculating the dependencies and the software package, it is possible to determine the critical and recommended flow rate (with a margin of 10-20%) for the well to work without complications in the conditions of sand development and accumulation of liquid at the bottom.

Keywords: Concentric lift column, gas production, liquid accumulation at the bottom, an algorithm for calculating critical flow rate, software package.

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Pollution control measures for core and buffer zone as sustainable framework at Dongri Buzurg opencast mine of MOIL Limted


Abstract: MOIL Limited has been using technologies for sustainable development since its inception. The sustainable development framework (SDF) is addressing on various issues begin with grant of mining lease to final mine closure plan stages of mining life cycle. The SDF is also refers to on economics, environment and social impacts of mining. The mining activities disturb local ecosystem and bio-diversity, moreover causes largescale deforestation, loss of grassy land, soil erosion, contamination of soil and water, noise pollution. It also causes the environment degradations that lead to destruction of wildlife habitat. To achieve the integration of socio-environmental-economic factors it is essential to develop and implement SDF. By recent amendment of Mines and Minerals (Development and Regulation) Act, 1957, implementation and evaluation of SDF have become mandatory. SDF is modelled by international agencies like International Union for the Conservation of Nature and Natural Resources (IUCN) and International Council of Mining and Metal (ICMM) and tailored for Indian conditions. Some of the aspects of SDF are covered in a case study, which was conducted in Dongri Buzurg opencast mine. The paper presents the SDF used by MOIL at Dongri Buzurg mine for incremental improvement in protection of environmental impacts in core and buffer zone.

Keywords: Afforestation, blasting, dumps, environment, pollution.

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Iron ore mining and food security of rural household – an analysis in Odisha, India

Jun 2020 / by MINATI SAHOO

Abstract: The present paper attempts to assess and analyse the situation of food security in the context of its accessibility and utilisation among rural households in iron-ore mining region of Odisha, India. A comparative approach with statistical techniques like t-test, Z-test and F-test has been used in the present study. It has been found out that despite of higher average income and expenditure on food, the average calorie intake of households in mining region is significantly lower than the households in non-mining region. Even the proportion of households suffering from calorie deficiency is significantly higher in mining areas than in non-mining areas. The reason behind is the heavy dependence of household on market for consumption of rice. This shows that mining activities do not ensure food security to its rural households and have a significant negative impact on it. Hence, suitable policy measures should be undertaken by the administrative machinery so that mining could not only contribute the economic development of the region but would also ensure food security to the households in the region.

Keywords: Calorie, mining, access, deficiency, food security, utilisation.

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Influence of temperature on tribological behaviour of dual reinforced aluminium MMCs


Abstract: The aim of this study is to explore the sliding wear behavior of aluminium alloy LM 25, Al/10 wt.% fly ash (FA) composite, AA/10 wt.% steel particles (SP) composites and AA/5wt.% FA/5 wt.% SP hybrid composites with respect to load, velocity and pin temperature conditions employing a pin on disc friction and wear machine. The wear characteristics such as coefficient of friction and wear loss are considered for the study. Results raveled that the wear loss of Al alloy and composites increases when the pin temperature was increased. Wear loss of Al/SP composite was lower than that of Al/FA composite. However Al/FA/SP hybrid composites exhibited superior wear resistance compared to Al alloy, Al/FA and Al/SP composites. It is obvious that the inclusion of the dual reinforcements such as FA and SP into the Al alloy increases the wear resistance as compared to single reinforced AMCs such as AL/FA and AL/SP composites.

Keywords: Aluminium alloy LM 25 coefficient of friction; fly ash; hybrid composites; steel particles; wear loss

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Influence of heat treatment on the exit burr height in drilling of Al alloy 7075 – a statistical analysis


Abstract: In this work, the effect of heat treatment on the burr height is investigated with three different cutting speeds and feeds in drilling of Al alloy 7075. Al alloy was chosen in three different conditions such as As-cast condition, annealed condition and hardened condition. Three different feeds such as 30 m/min, 60 m/min, 90 m/min and three different cutting speeds such as 12.56 m/min, 37.68 m/min, 62.8 m/ min are chosen. Drilling tests are conducted as per the Taguchi’s L9 orthogonal array. The experimental results are analyzed using Analysis of Variance (ANOVA) to study the influence of the factors on burr height.

Keywords: Drilling, burr height, Al alloy 7075, As-cast condition, heat treatment, Taguchi, ANOVA

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