Equation for Oil and Gas Two-Phase Flow into Vertical Well - A Theoretical Derivation

2013 ◽  
Author(s):  
Kegang Ling ◽  
Jun He
Keyword(s):  
Oil And Gas ◽  
Two Phase Flow ◽  
Phase Flow ◽  
Two Phase ◽  
Theoretical Derivation ◽  
Vertical Well

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.

Nonisothermal two-phase flow in a vertical well

2015 ◽  
Vol 56 (2) ◽  
pp. 177-181
Author(s):  
R. F. Sharafutdinov ◽  
T. R. Khabirov ◽  
A. A. Sadretdinov
Keyword(s):  
Two Phase Flow ◽  
Phase Flow ◽  
Two Phase ◽  
Vertical Well

Study on Void Fraction Measurement Model of Gas-Liquid Two-Phase Flow Based on the Differential Pressure Sensor

2013 ◽  
Vol 816-817 ◽  
pp. 924-927
Author(s):  
Li De Fang ◽  
Qing He ◽  
Yao Zhang ◽  
Yu Jiao Liang
Keyword(s):  
Void Fraction ◽  
Pressure Sensor ◽  
Two Phase Flow ◽  
Measurement Model ◽  
Differential Pressure ◽  
Phase Flow ◽  
Two Phase ◽  
Theoretical Derivation ◽  
Differential Pressure Sensor ◽  
Superficial Gas Velocity

The paper bases on the differential pressure signal measured by the differential pressure sensor for the study and measurement of gas-liquid two-phase flow void fraction. We compare theory section void fraction and practical section void fraction with superficial gas velocity, the theoretical derivation formula has been observed and qualitatively explained.

scholarly journals Numerical Analysis of a Two-Phase Flow (Oil and Gas) in a Horizontal Separator used in Petroleum Projects

2019 ◽  
Vol 12 (4) ◽  
pp. 1037-1045 ◽  
Author(s):  
S. Yayla ◽  
K. Kamal ◽  
S. Bayraktar ◽  
◽  
◽  
...  
Keyword(s):  
Numerical Analysis ◽  
Oil And Gas ◽  
Two Phase Flow ◽  
Phase Flow ◽  
Two Phase

Numerical Investigation of Two-Phase Flow in 45 Degrees “Y” Junctions

2015 ◽  
Author(s):  
Carlos Chacon ◽  
Carlos Moreno ◽  
Miguel Arbej ◽  
Miguel Asuaje
Keyword(s):  
Oil And Gas ◽  
Two Phase Flow ◽  
Petroleum Industry ◽  
Continuous Phase ◽  
Working Fluid ◽  
Phase Flow ◽  
Two Phase ◽  
Flow Energy ◽  
Oil Flow ◽  
Oil Gas

Frequently, Two-phase flow occurs in petroleum industry. It takes place on production and transportation of oil and natural gas. Initially, the most common patterns for vertical flow are Bubble, Slug, Churn and Annular Flow. Then, for horizontal flow, the most common patterns are Stratified Smooth, Stratified Wavy, Elongated Bubble, Slug, Annular, Wavy Annular and Dispersed Bubble Flow. It is also known that after separation, each fluid is carried through pipes, so oil is moved long distances. However, as it is known, the oil energy diminishes on the way. For that reason, it is needed a pumping station for keeping the oil flow energy high for proper movement. Additionally, that fluid is transported through a network, so fittings are present, like elbows, “T” and “Y” junctions, and others. As known, on a piping network, the losses can be classified in two groups: large and localized. The former consists on losses due to wall roughness-fluid interaction. The latter is related with fittings. This study is focused on 45° “Y” junctions. The main purpose of this study is to simulate the fluid flow on a 45° “Y” junction, using a 0.1143 m diameter 2 m length pipe, in which a 0.0603 m diameter 1 m length pipe confluences, using oil-gas as the working fluid, considering Dispersed Bubble Pattern. It can be attributed a “K” flow loss coefficient for each path, from each entry to the exit of the junction. For the Two-Phase Flow, it was supposed a horizontal Dispersed Bubble Pattern, which takes place at very high liquid flow rates. So the liquid phase is the continuous phase, in which the gas phase is dispersed as discrete bubbles. Particularly three API Grades were considered for the oil, corresponding to three main types of continuous phase. For the numerical model, it was generated several non-structured grids for validation, using water as a fluid. Then the simulations were carried out, using non-homogenous model, with oil and gas, changing the gas void fraction, and the superficial velocities for gas and liquid. A commercial package was used for numerical calculations. It was encountered that changing the value of the referred variables, in some cases the exit pressure of the “Y” junction diminishes. For validation of the results, a literature model was used for comparing both “K” loss coefficients: numerically and from the bibliography. It is important to highlight that these results, permit to analyze a way of diminishing the fluid energy losses in a Two-Phase oil-gas piping network, particularly in 45° “Y” junctions which represents economically saving.

scholarly journals A robust method for estimating the two-phase flow rate of oil and gas using wellhead data

2020 ◽  
Vol 10 (6) ◽  
pp. 2335-2347
Author(s):  
Ehsan Khamehchi ◽  
Mohammad Zolfagharroshan ◽  
Mohammad Reza Mahdiani
Keyword(s):  
Flow Rate ◽  
Oil And Gas ◽  
Two Phase Flow ◽  
Phase Flow ◽  
Robust Method ◽  
Two Phase

Optimal Route for Pipelines in Two-Phase Flow

1971 ◽  
Vol 11 (03) ◽  
pp. 215-222 ◽  
Author(s):  
Uri Shamir
Keyword(s):  
Single Phase ◽  
Oil And Gas ◽  
Two Phase Flow ◽  
Optimal Solution ◽  
Oil Industry ◽  
Phase Flow ◽  
Optimal Route ◽  
Two Phase ◽  
Aerial Photos ◽  
Single Pipe

Abstract A technique is described, which makes it possible to select the optimal route for a pipeline designed to carry oil and gas in two-phase flow. The pipeline is assumed to operate under the pressure differential naturally available between the source and the point of delivery. point of delivery. A discrete grid is established to describe the corridor through which the pipeline is to pass. Topograpbic and terrain data are given for all grid points. Cost data is given for all factors which points. Cost data is given for all factors which affect the capital cost of the pipeline. The equation for the two-phase flow becomes a global constraint, to be satisfied by the selected route. Dynamic programming is then used to solve the minimization programming is then used to solve the minimization problem. problem. A computer program is described, with which a sample problem was solved, and the results that were obtained are also presented. Introduction Great sums of money are spent annually on the construction of pipelines for the oil industry. Many of these pipelines are designed to carry gas and oil in simultaneous two-phase flow from wells to various collecting and processing facilities. The procedures for selecting the route for such pipelines procedures for selecting the route for such pipelines have followed the traditional approach of engineering judgment and selection of the cheapest among a few alternative routes laid out by hand on maps and aerial photos. Aerial photo interpretation, to yield soil types, tree cover, existence of swamps and muskeg, and other factors affecting costs, is being used in route selection. Geologists and soil engineers are brought in to evaluate soil conditions on the basis of aerial photos, as well as by examination of the route itself and soil samples. This data is then used to select a route and to design the pipeline. The present project was undertaken with the objective of improving the engineering practice. We sought to proceed beyond the stage of mere trial and error and to develop a rigorous method for determining the optimal route by using the techniques of systems engineering. The over-all problem of conveying fluids in one-and two-phase flow pipelines was reviewed. It ranges from a single pipe carrying a single-phase fluid, through two-phase flow lines, to gathering systems containing networks of pipes and other equipment, such as valves and compressors, to collect the products of a large number of wells and deliver the mixed product to processing plants. All these were considered part of the over-all project, which deals with optimal design of pipeline systems. Initially, one aspect of the over-all project had to be selected. It was decided to tackle the problem of optimizing the route for a single pipeline carrying two-phase flow. This problem presents some complications, and it was felt that if it could be solved, single-phase pipelines would present no added difficulties. TWO-PHASE FLOW PIPELINES It is common practice in the oil industry to use a single pipe to carry both oil and gas from producing wells to collecting facilities and plants. The alternative is to separate the two phases at the source and carry them in separate pipelines. Economics of the two alternatives should be the basis for a choice between them. The present work is therefore a useful tool for making a better choice possible by yielding the optimal solution for the possible by yielding the optimal solution for the two-phase line alternative. As will be shown later, the method, as well as the computer programs, can also be used to determine the optimal route for a pipeline carrying flow of a single fluid. pipeline carrying flow of a single fluid. COMPUTING SIMULTANEOUS FLOW OF LIQUID AND GAS IN A PIPELINE The regime of flow in a pipeline carrying both liquid and gas depends on many parameters. The regime, in turn, determines the pressure losses along the pipeline. The procedures for computing the two-phase flow are both elaborate and rather inaccurate. No attempt is made in the present work to change or to improve the existing methods, as this is beyond its scope. We do need, however, to modify the sequence of the computations to suit the requirements of the optimization problem. SPEJ P. 215

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