scholarly journals Decrease of Harmful Atmospheric Emission at Oil and Gas Condensate Fields Owing to Application of Jet Devices

2016 ◽  
Vol 5 (3) ◽  
pp. 41-47
Author(s):  
Спиридонов ◽  
V. Spiridonov ◽  
Акимов ◽  
M. Akimov
Keyword(s):  
Mass Fraction ◽  
Oil And Gas ◽  
Two Phase Flow ◽  
Gas Condensate ◽  
Gas Jet ◽  
Phase Flow ◽  
Two Phase ◽  
Mixing Chamber ◽  
Active Flow ◽  
Initial Zone

Actuality of atmosphere protection from pollution by low-pressure flare gas as well as possibility of solving of this problem owing to application of liquid-gas jet devices with two-phase active flow are shown. Results of experimental investigations of ejectors with active two-phase flow at mass fraction of gas in active flow more than 0.003 are presented. Significant error of calculation results using approach which does not take into consideration interaction of active gas and liquid at mixing chamber initial zone is observed. It is shown that use of momentum conservation equation for liquid and gas flows at mixing chamber initial zone enables to take into account influence of active gas energy and to obtain satisfactory agreement of calculation and experimental data at mass fraction of gas in active flow more than 0.003. The obtained results were used for designing of liquid-gas jet devices with active two-phase flow for low-pressure flare gas utilization at Kokdumalak oil and gas condensate field.

A Two-Phase Flow Model for Reserves Estimation in Tight-Oil and Gas-Condensate Reservoirs Using Scaling Principles

2021 ◽  
pp. 1-18
Author(s):  
L. M. Ruiz Maraggi ◽  
L. W. Lake ◽  
M. P. Walsh
Keyword(s):  
Gas Flow ◽  
Single Phase ◽  
Oil And Gas ◽  
Two Phase Flow ◽  
Gas Condensate ◽  
Tight Oil ◽  
Phase Flow ◽  
Reservoir Pressure ◽  
Single Phase Flow ◽  
Two Phase

Summary A common approach to forecast production from unconventional reservoirs is to extrapolate single-phase flow solutions. This approach ignores the effects of multiphase flow, which exist once the reservoir pressure falls below the bubble/dewpoint. This work introduces a new two-phase (oil and gas) flow solution suitable to extrapolating oil and gas production using scaling principles. In addition, this study compares the application of the two-phase and the single-phase solutions to estimates of production from tight-oil wells in the Wolfcamp Formation of west Texas. First, we combine the oil and the gas flow equations into a single two-phase flow equation. Second, we introduce a two-phase pseudopressure to help linearize the pressure diffusivity equation. Third, we cast the two-phase diffusion equation into a dimensionless form using inspectional analysis. The output of the model is a predicted dimensionless flow rate that can be easily scaled using two parameters: a hydrocarbon pore volume and a characteristic time. This study validates the solution against results of a commercial simulator. We also compare the results of both the two-phase and the single-phase solutions to forecast wells. The results of this research are the following: First, we show that single-phase flow solutions will consistently underestimate the oil ultimate recovery factors (URFs) for solution gas drives. The degree of underestimation will depend on the reservoir and flowing conditions as well as the fluid properties. Second, this work presents a sensitivity analysis of the pressure/volume/temperature (PVT) properties, which shows that lighter oils (more volatile) will yield larger recovery factors for the same drawdown conditions. Third, we compare the estimated ultimate recovery (EUR) predictions for two-phase and single-phase solutions under boundary-dominated flow (BDF) conditions. The results show that single-phase flow solutions will underestimate the ultimate cumulative oil production of wells because they do not account for liberation of dissolved gas and its subsequent expansion (pressure support) as the reservoir pressure falls below the bubblepoint. Finally, the application of the two-phase model provides a better fit when compared with the single-phasesolution. The present model requires very little computation time to forecast production because it only uses two fitting parameters. It provides more realistic estimates of URFs and EURs, when compared with single-phase flow solutions, because it considers the expansion of the oil and gas phases for saturated flow. Finally, the solution is flexible and can be applied to forecast both tight-oil and gas condensate wells.

Simulation of Two Phase Flow Dynamics in Flexible Riser Exit Geometries for Oil and Gas Applications

2018 ◽  
Vol 39 ◽  
pp. 1-13
Author(s):  
Ikpe E. Aniekan ◽  
Owunna Ikechukwu ◽  
Satope Paul
Keyword(s):  
Oil And Gas ◽  
Two Phase Flow ◽  
Flow Analysis ◽  
Computational Cost ◽  
Maximum Velocity ◽  
Oil Well ◽  
Phase Flow ◽  
Two Phase ◽  
The Third ◽  
Riser Pipe

Four different riser pipe exit configurations were modelled and the flow across them analysed using STAR CCM+ CFD codes. The analysis was limited to exit configurations because of the length to diameter ratio of riser pipes and the limitations of CFD codes available. Two phase flow analysis of the flow through each of the exit configurations was attempted. The various parameters required for detailed study of the flow were computed. The maximum velocity within the pipe in a two phase flow were determined to 3.42 m/s for an 8 (eight) inch riser pipe. After thorough analysis of the two phase flow regime in each of the individual exit configurations, the third and the fourth exit configurations were seen to have flow properties that ensures easy flow within the production system as well as ensure lower computational cost. Convergence (Iterations), total pressure, static pressure, velocity and pressure drop were used as criteria matrix for selecting ideal riser exit geometry, and the third exit geometry was adjudged the ideal exit geometry of all the geometries. The flow in the third riser exit configuration was modelled as a two phase flow. From the results of the two phase flow analysis, it was concluded that the third riser configuration be used in industrial applications to ensure free flow of crude oil and gas from the oil well during oil production.

Numerical Predication of Two-Phase Flow in Mixing Chamber of the Quick-Contact Cyclone Reactor

2012 ◽  
Vol 516-517 ◽  
pp. 945-948
Author(s):  
Yu Chun Zhang ◽  
Zhen Bo Wang ◽  
You Hai Jin
Keyword(s):  
Velocity Field ◽  
Flow Pattern ◽  
Two Phase Flow ◽  
Volume Fraction ◽  
Structure Optimization ◽  
Phase Flow ◽  
Solid Contact ◽  
Eulerian Model ◽  
Two Phase ◽  
Mixing Chamber

Gas-solid two-phase flow of the quick-contact cyclone reactor used in FCC was simulated with the multi fluid Eulerian model, especially the velocity field and volume fraction of solid in the mixing chamber was researched. The results show that flow pattern and catalyst particles concentration are non-uniform in the direction of axial, radial and tangential. The tangential gas admission increases turbulent intensity, it has a great benefit on spreading the catalyst particles uniformly, enhancing gas-solid contact effect. This work could offer a base for the structure optimization of the quick-contact reactor.

scholarly journals Control-volume-based model of the steam-water injector flow

2010 ◽  
Vol 31 (1) ◽  
pp. 45-59 ◽  
Author(s):  
Roman Kwidziński
Keyword(s):  
Cross Sections ◽  
Two Phase Flow ◽  
Control Volume ◽  
Outlet Temperature ◽  
Phase Flow ◽  
Two Phase ◽  
Flow Parameters ◽  
Mixing Chamber ◽  
Wave Region ◽  
Water Nozzle

Control-volume-based model of the steam-water injector flow The paper presents equations of a mathematical model to calculate flow parameters in characteristic cross-sections in the steam-water injector. In the model, component parts of the injector (steam nozzle, water nozzle, mixing chamber, condensation wave region, diffuser) are treated as a series of connected control volumes. At first, equations for the steam nozzle and water nozzle are written and solved for known flow parameters at the injector inlet. Next, the flow properties in two-phase flow comprising mixing chamber and condensation wave region are determined from mass, momentum and energy balance equations. Then, water compression in diffuser is taken into account to evaluate the flow parameters at the injector outlet. Irreversible losses due to friction, condensation and shock wave formation are taken into account for the flow in the steam nozzle. In two-phase flow domain, thermal and mechanical nonequilibrium between vapour and liquid is modelled. For diffuser, frictional pressure loss is considered. Comparison of the model predictions with experimental data shows good agreement, with an error not exceeding 15% for discharge (outlet) pressure and 1 K for outlet temperature.

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