Development of devices for implementation pulse nonstationary waterflooding

2020 ◽  
pp. 68-74
Author(s):  
G.G. Gilaev ◽  
◽  
M.Ya. Khabibullin ◽  
D.G. Antoniadi ◽  
T.V. Khismetov ◽  
...  
Keyword(s):  
Mathematical Model ◽  
Theoretical Calculations ◽  
Operating Parameters ◽  
Reservoir Pressure ◽  
Testing Device ◽  
Injection Wells ◽  
Positive Data ◽  
Capillary Impregnation ◽  
Basic Operating ◽  
Bench Testing

To further improve the efficiency of the non-stationary flooding (acceleration of capillary impregnation oil closed pores) at the bottom of injection wells installed devices, creating pulses in the pumped liquid, with a packer. The article deals with a device designed for this purpose. A mathematical model of the device and output expressions to define the basic operating parameters of output. For comparison of theoretical calculations show the results of bench testing device. In view of previous research, the authors of substantiated the effectiveness of such devices for the nonstationary flooding in the system to maintain reservoir pressure. The preliminary positive data on fishing the use of these devices in the fields of NC «Rosneft» in 2015-2016.

A New Mathematical Model to Calculate DC Transmission System’s Operating Parameters

2012 ◽  
Vol 614-615 ◽  
pp. 988-995
Author(s):  
Rong Yan Shang ◽  
Yin Chen ◽  
Chang Qing Peng
Keyword(s):  
Mathematical Model ◽  
Theoretical Analysis ◽  
Decomposition Method ◽  
Theoretical Calculations ◽  
Transmission System ◽  
Operating Parameters ◽  
Fourier Decomposition ◽  
Calculation Results ◽  
And Control ◽  
The Mathematical Model

To study the DC transmission system, and control it in real-time, many researchers make models based on the Fourier decomposition method. However, their calculations are not very precise. In this paper, a new mathematical model for the DC transmission system was build, by use of the Fourier formulas to decompose the current on the converter transformer’s valve side. Formulas for the operating parameters of both rectifier station and inverter station were derived, and the effects of the harmonics were considered. Results from theoretical calculations and experimental collection show that waveforms of the operating parameters are very similar. Even the experimental waveforms change a little, the calculation results can reflect the change clearly, which fully prove that the theoretical analysis is correct and the mathematical model is accurate.

scholarly journals Numerical Simulation of the Influence of Geological CO2 Storage on the Hydrodynamic Field of a Reservoir

Geofluids ◽  
2019 ◽  
Vol 2019 ◽  
pp. 1-21
Author(s):  
Zhaoxu Mi ◽  
Fugang Wang ◽  
Zhijie Yang ◽  
Xufeng Li ◽  
Yujie Diao ◽  
...  
Keyword(s):  
Pressure Field ◽  
Co2 Storage ◽  
Shallow Groundwater ◽  
Shallow Aquifer ◽  
Reservoir Pressure ◽  
Geological Storage ◽  
Injection Wells ◽  
Geological Conditions ◽  
Deep Reservoir ◽  
The Impact

CO2 geological storage in deep saline aquifers is an effective way to reduce CO2 emissions. The injection of CO2 inevitably causes a significant pressure increase in reservoirs. When there exist faults which cut through a deep reservoir and shallow aquifer system, there is a risk of the shallow aquifer being impacted by the changes in reservoir hydrodynamic fields. In this paper, a radial model and a 3D model are established by TOUGH2-ECO2N for the reservoir system in the CO2 geological storage demonstration site in the Junggar Basin to analyze the impact of the CO2 injection on the deep reservoir pressure field and the possible influence on the surrounding shallow groundwater sources. According to the results, the influence of CO2 injection on the reservoir pressure field in different periods and different numbers of well is analyzed. The result shows that the number of injection wells has a significant impact on the reservoir pressure field changes. The greater the number of injection wells is, the greater the pressure field changes. However, after the cessation of CO2 injection, the number of injection wells has little impact on the reservoir pressure recovery time. Under the geological conditions of the site and the constant injection pressure, although the CO2 injection has a significant influence on the pressure field in the deep reservoir, the impact on the shallow groundwater source area is minimal and can be neglected and the existing shallow groundwater sources are safe in the given project scenarios.

Regenerative Gas Turbines With Divided Expansion

2004 ◽  
Author(s):  
Brian Elmegaard ◽  
Bjo̸rn Qvale
Keyword(s):  
Mathematical Model ◽  
Gas Turbines ◽  
High Efficiency ◽  
Limited Range ◽  
Simulation Program ◽  
Operating Parameters ◽  
Gas Generator ◽  
Extensive Simulation ◽  
Power Turbine ◽  
The Mathematical Model

Recuperated gas turbines are currently drawing an increased attention due to the recent commercialization of micro gas turbines with recuperation. This system may reach a high efficiency even for the small units of less than 100kW. In order to improve the economics of the plants, ways to improve their efficiency are always of interest. Recently, two independent studies have proposed recuperated gas turbines to be configured with the turbine expansion divided, in order to obtain higher efficiency. The idea is to operate the system with a gas generator and a power turbine, and use the gas from the gas generator part for recuperation ahead of the expansion in the power turbine. The present study is more complete than the predecessors in that the ranges of the parameters have been extended and the mathematical model is more realistic using an extensive simulation program. It is confirmed that the proposed divided expansion can be advantageous under certain circumstances. But, in order for todays micro gas turbines to be competitive, the thermodynamic efficiencies will have to be rather high. This requires that all component efficiencies including the recuperator effectiveness will have to be high. The advantages of the divided expansion manifest themselves over a rather limited range of the operating parameters, that lies outside the range required to make modern micro turbines economically competitive.

scholarly journals Mathematical Model of Bainitic Transformation in Austempered Ductile Iron

2017 ◽  
Vol 17 (4) ◽  
pp. 200-206
Author(s):  
I. Olejarczyk-Wożeńska ◽  
H. Adrian ◽  
B. Mrzygłód ◽  
M. Głowacki
Keyword(s):  
Mathematical Model ◽  
Grain Size ◽  
Ductile Iron ◽  
Theoretical Calculations ◽  
Experimental Studies ◽  
Bainitic Transformation ◽  
Transformation Model ◽  
Austenite Grain Size ◽  
Ttt Diagram ◽  
Austenite Grain

AbstractA mathematical model of austenite - bainite transformation in austempered ductile cast iron has been presented. The model is based on a model developed by Bhadeshia [1, 2] for modelling the bainitic transformation in high-silicon steels with inhibited carbide precipitation. A computer program has been developed that calculates the incubation time, the transformation time at a preset temperature, the TTT diagram and carbon content in unreacted austenite as a function of temperature. Additionally, the program has been provided with a module calculating the free energy of austenite and ferrite as well as the maximum driving force of transformation. Model validation was based on the experimental research and literature data. Experimental studies included the determination of austenite grain size, plotting the TTT diagram and analysis of the effect of heat treatment parameters on the microstructure of ductile iron. The obtained results show a relatively good compatibility between the theoretical calculations and experimental studies. Using the developed program it was possible to examine the effect of austenite grain size on the rate of transformation.

scholarly journals Modeling of T-16M self-propelled chassis’ diesel engine starting motor energy capacity

2018 ◽  
Author(s):  
Д.Н. Маничев ◽  
Д.Г. Мясищев
Keyword(s):  
Mathematical Model ◽  
Fuel Consumption ◽  
Theoretical Calculations ◽  
Target Function ◽  
Energy Capacity ◽  
Logical System ◽  
Winter Conditions ◽  
The Mathematical Model ◽  
The Given ◽  
Tractor Engine

Приведена разработка математической модели расхода топлива в режиме пуска двигателя пусковым устройством. Проведено сравнение с результатами исследовательских испытаний. Целевой функцией в математической модели является часовой расход топлива всей рассматриваемой системы МП-5 «Урал-2Т ЭЛЕКТРОН» – двигатель Д-21А1. Целью работы является описание математической модели для данной логической системы. При данном подходе также использованы основы оценки топливной экономичности колесных малогабаритных лесотранспортных систем. После проведения математических расчетов получили часовой расход топлива В = 1,24 кг/ч. Проведение исследовательских испытаний запуска двигателя трактора Т-16М при помощи ПУ в зимний период показали, что часовой расход топлива В = 1,28 кг/ч. Таким образом, погрешность теоретических расчетов и исследовательских испытаний составляет 6%. Сравнение теоретических и практических результатов позволяет сделать следующие выводы: теория, построенная на математической модели, дает результаты, наиболее близкие к экспериментальным с расхождением 6%; разработанная теоретическая модель входит в постановку задачи оптимизации компонентов пускового привода. The article is devoted to development of mathematical model of fuel consumption of the engine started by a starter as well as comparison with the results of the researches. Hourly fuel consumption of the MP-5 «Ural-2T ELECTRON» – engine D- 21A1 system represents the target function of the mathematical model. The aim of the article is to describe a mathematical model for the given logical system. As a result of mathematical calculations the hourly fuel consumption is B = 1.24 kg/h. Research tests of starting the T-16M tractor engine by the starter in winter conditions showed that the hourly fuel consumption B = 1.28 kg/h. Thus, discrepancy between theoretical calculations and research tests is 6%. Comparison of theoretical and practical results leads to following conclusions: theory based on the mathematical model gives results closest to experimental ones with a discrepancy of 6%; the developed theoretical model can be included into the task of starting drive components' optimization.

scholarly journals Abnormally high reservoir pressures in areas with a degraded energy state

2021 ◽  
Vol 3 (2) ◽  
pp. 54-60
Author(s):  
R. E. Khadarov ◽  
M. O. Tajibayev
Keyword(s):  
Detailed Analysis ◽  
Energy State ◽  
Reservoir Pressure ◽  
Injection Wells ◽  
Current Energy

Nowadays, in the Uzen and Karamandybas oilfields most of the developed objects show decreasing reservoir pressure. Therefore, there is a need to consider opportunities for increasing the efficiency of the existing system for maintaining reservoir pressure for specific identified areas. This article proposes an approach for a detailed analysis of the current energy state of certain areas through hydrodynamic tests of injection wells in non-stationary filtration modes. The reasons for the occurrence of abnormally high reservoir pressures are presented on the examples of wells, and possible ways to solve them are proposed.

On the selection of suitable operate durations for injection tests in low permeability reservoirs

2020 ◽  
Vol 6 (1) ◽  
pp. 135-149
Author(s):  
Guzyal F. Asalkhuzina ◽  
Alfred Ya. Davletbaev ◽  
Ildus L. Khabibullin ◽  
Rina R. Akhmetova
Keyword(s):  
Steady State ◽  
Numerical Model ◽  
Low Permeability ◽  
Reservoir Pressure ◽  
Well Test ◽  
Injection Wells ◽  
Fluid Filtration ◽  
Operating Modes ◽  
Low Permeability Reservoirs ◽  
Injection Modes

The article discusses the aspects of conducting and analyzing the results of hydrodynamic studies of wells (well test) at steady-state injection modes conducted in injection wells in order to assess reservoir pressure and injectivity. The main goal of this work is to determine the necessary duration of injection modes at which reservoir pressure will be determined at the maximum research radius. In view of the considerable duration of the study, in low-permeability reservoirs, the work of the environment wells is taken into account, which, in the process of well research, should have a minimal impact on the results of data interpretation. To this end, we simulated the dynamics of pressure changes for this type of well test for various parameters of the reservoir and the duration of injection modes, taking into account the influence of the work of the surrounding production wells. To solve this problem, we used a numerical model of fluid filtration in an element of a nine-point development system in a low-permeable reservoir. The production and injection of fluid is carried out in wells with main technogenic fractures of hydraulic fracturing. During the simulation, the filtration parameters of the “fracture-formation” system and the duration of the well operating modes were varied, and synthetic data on the change in pressure in the wells were reproduced. Pressure and flow rates at the well operating modes were analyzed by plotting the indicator diagram (ID). Estimates of the extrapolated pressure from the ID graphs were compared with the pressures in the numerical model, in particular, the pressure on the supply circuit and on the study radius. It is shown that for low-permeability formations when studying injection wells using the steady-state injection method, it is necessary to take into account the research radius, which depends on the permeability of the formation and the duration of the injection regimes. Also, the research radius must be taken into account when constructing isobar maps along with the reservoir pressure value.

Mathematical Model of the Liquid Membrane Extractive Column. Sensitivity to Operating Parameters

2008 ◽  
Vol 59 (3) ◽  
pp. 336-345
Author(s):  
Daniel Dinculescu ◽  
Vasile Lavric
Keyword(s):  
Mathematical Model ◽  
Aqueous Phase ◽  
Closed Loop ◽  
Liquid Membrane ◽  
Extraction Column ◽  
Model Parameters ◽  
Operating Parameters ◽  
Back Extraction ◽  
Orthogonal Collocation ◽  
Transfer Coefficients

The extraction-back extraction column of low concentration species by means of an organic closed loop flow, considered as liquid membrane, was modelled then simulated, using some simplifying assumptions. The main hypotheses are: the aqueous phase is perfectly mixed, the drops of the organic phase are lumped into a plug-flow inner cylinder co-axial with the aqueous phase, and the organic phases under the sieve and on the top of the column are perfectly mixed also. The dynamic model of the extraction-back extraction column is, then, applied to the recovery of the hydrocarboxylic acids. The mathematical model, reduced through orthogonal collocation to a system of ordinary differential equations, was solved using a self-adaptive (RK)-type method. Its validation was done based on batch experimental data; the optimal model parameters (the specific mass transfer coefficients for both extraction and back-extraction zones), ensuring the agreement with the experiment, were found by means of a modified genetic algorithm technique. Then, a sensitivity analysis was done, to grasp the behaviour of the system with respect to the main operating parameters - the organic flow in the closed loop, the partition coefficient and the buffer volume.

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