CN109376452A - A kind of method for numerical simulation of gathering line hot-washing wax remover phase-change heat transfer - Google Patents
A kind of method for numerical simulation of gathering line hot-washing wax remover phase-change heat transfer Download PDFInfo
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- CN109376452A CN109376452A CN201811335293.3A CN201811335293A CN109376452A CN 109376452 A CN109376452 A CN 109376452A CN 201811335293 A CN201811335293 A CN 201811335293A CN 109376452 A CN109376452 A CN 109376452A
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2113/00—Details relating to the application field
- G06F2113/14—Pipes
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
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- G06F2119/08—Thermal analysis or thermal optimisation
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Abstract
The present invention relates to a kind of method for numerical simulation of gathering line hot-washing wax remover phase-change heat transfer comprising: one, using three-dimensional software establish content of wax gathering line threedimensional model；Two, using paraffin in gathering line and hot water as research object, the governing equation of computation model is determined；Three, according to governing equation and oil-field hot-washing wax remover site technique condition, using CFD software progress Non-Steady Numerical Simulation: the boundary condition in setup algorithm region divides zoning grid according to the three-dimensional structure, establish discrete equation, determine discrete primary condition and boundary condition, it is given solve control parameter, zoning initializes and solves, obtain the analog result of melted paraffin wax in gathering line；Four, the analog result for analyzing melted paraffin wax, judges wax removal effect；Five, change technological parameter, again step 3 ~ tetra-, influence of the analysis process parameter to wax removal effect.The present invention can solve the problems such as hot washing period in field test is long, and precision is difficult to ensure, save the plenty of time.
Description
Technical field:
The present invention relates to gathering line hot-washing wax remover technical fields, and in particular to be a kind of gathering line hot-washing wax remover phase
Become the method for numerical simulation of heat transfer.
Background technique:
Most of crude oil of China's production is containing waxy crudes.In oil extraction and transport process, crude oil temperature can be due to pipe
Road radiates and constantly declines, and when crude oil temperature is lower than wax precipitation point temperature, the wax molecule in crude oil just starts close simultaneously to tube wall
It is precipitated, so-called wax deposition phenomenon occurs.Crude oil pipeline wax deposition problem is always to perplex the thorny problem of Oil & Gas Storage worker.Knot
The presence of wax layer can be such that circulation area of pipeline reduces, and frictional resistance increases, and reduce pipeline transmission capacity, can make line clogging very when serious
To halt production, result in significant economic losses and safety accident.
Existing wax removal method mainly has mechanical paraffin removal, heating power wax removal, paraffin removing with chemical method and ultrasonic wave wax removal etc., and
In the practical wax removal operation of Oil Field, hot-washing wax remover is using relatively broad.During live wax removal, operating time and period compared with
Long, influence factor is numerous, and the precision of test is difficult to be guaranteed, and judges that wax removal is imitated by merely look at the pressure change of pipeline
Fruit.
CFD software is the abbreviation of cfdrc, is to be specifically used to carry out flow field analysis, Flow Field Calculation and flow field
The software of prediction.CFD simulated operation is simple, investment is low, calculating speed is fast, can simulate various working in a relatively short period of time,
With the development of science and technology CFD analogue technique is increasingly applied to various industries.By the numerical simulation of CFD, us can be made more
The deep internal mechanism for recognizing problem provides guidance for test, human and material resources and the time needed for saving test, simultaneously
Rule for obtaining test result plays good directive function.CFD simulates grinding in terms of pipeline hot-washing wax remover at present
Study carefully seldom, what the existing research to wax phase change problem in pipeline used is all enthalpy model, it is assumed that the paraffin of fusing is not with changing
Hot fluid flowing, and the paraffin after melting during practical wax removal is with hot wash media flow.
It would therefore be desirable to which a kind of method for numerical simulation of new gathering line hot-washing wax remover phase-change heat transfer, can simulate
Influence of the influence factors such as hot water, flow velocity to hot wash effect, to solve the blank in currently available technology.
Summary of the invention:
The object of the present invention is to provide a kind of method for numerical simulation of gathering line hot-washing wax remover phase-change heat transfer, this gathering lines
The method for numerical simulation of hot-washing wax remover phase-change heat transfer is for solving the problems, such as the existing research to wax phase change in pipeline using physics
There is the hypothesis not being inconsistent with scene in model.
The technical solution adopted by the present invention to solve the technical problems is: this gathering line hot-washing wax remover phase-change heat transfer
Method for numerical simulation the following steps are included:
One, content of wax gathering line threedimensional model is established using three-dimensional software；
Two, using paraffin in gathering line and hot water as research object, the governing equation of computation model, the governing equation packet are determined
It includes:
Wherein:α n It isnThe volume fraction of kind fluid in a control unit,u i For the velocity component on the direction x,u j For the direction y
On velocity component,τFor the time,x i For the x-axis under cartesian coordinate,x j For the y-axis under cartesian coordinate,ρFor the close of paraffin
Degree,μFor the dynamic viscosity of paraffin liquid phase,PFor pressure,g i For acceleration of gravity,S i For momentum source term,kFor thermal coefficient,HFor
Sensible heat enthalpy；
Three, it according to the governing equation and oil-field hot-washing wax remover site technique condition of step 2 foundation, is carried out using CFD software non-steady
State numerical simulation: the boundary condition in setup algorithm region divides zoning grid according to the three-dimensional structure, establishes discrete
Equation determines that discrete primary condition and boundary condition, given solution control parameter, zoning are initialized and solved, and is collected
The analog result of melted paraffin wax in defeated pipeline；
Four, the analog result of melted paraffin wax in gathering line is analyzed, judges wax removal effect；
Five, change technological parameter, technological parameter includes water temperature, flow velocity, re-starts step 3 ~ tetra-, analysis process parameter is to clear
The influence of wax effect.
It includes following method that step 2, which establishes governing equation, in above scheme:
It selects FLUENT software to carry out simulation calculating, chooses the Phase-change Problems of enthalpy model processing paraffin；Choose VOF(Volume
Of Fluid) model treatment paraffin and hot water Multiphase Flow；The Reynolds chosen in RNG k- ε two-equation model processing turbulent flow is answered
Power is assumed.
The boundary condition in step 3 setup algorithm region includes: the boundary condition for setting hot water inlet region in above scheme
For speed entrance, the boundary condition in hot water outlet region is set as free export, it is exhausted for setting the boundary condition of pipeline external surface
Thermal boundary, turbulent flow turbulence intensity and hydraulic diameter the method definition of hot water inlet's boundary condition.
The analog result of melted paraffin wax includes temperature cloud picture, paraffin liquid phase cloud atlas and paraffin in gathering line in above scheme
Liquid fraction versus time curve.
The invention has the following advantages:
1. improving the accuracy of simulation present invention employs the CFD analogy method of unstable state.
2. the case where paraffin after analog fusing of the present invention is with hot wash media flow, more close to site test results.
3. wax layer through-thickness is there is apparent compositional difference in the present invention, paraffin layer distributed in analog pipeline
The case where.
4. the present invention can thermo parameters method in the post-processing by checking CFD, paraffin liquid phase cloud atlas and paraffin liquid fraction
Versus time curve investigates the speed of melted paraffin wax.
5. the present invention can solve, the hot washing period in field test is long, and precision is difficult to ensure, experiment law derives difficult
The problems such as, the plenty of time is saved, provides theoretical direction for field test.
Four, Detailed description of the invention:
Fig. 1 is a kind of flow chart of the method for numerical simulation of gathering line hot-washing wax remover phase-change heat transfer of the invention.
Specific embodiment
Following further describes the present invention with reference to the drawings:
As shown in Figure 1, the method for numerical simulation of this gathering line hot-washing wax remover phase-change heat transfer the following steps are included:
One, content of wax gathering line threedimensional model is established using three-dimensional software.
Two, using paraffin in gathering line and hot water as research object, governing equation is established, FLUENT software is selected to carry out mould
It is quasi- to calculate, choose the Phase-change Problems of enthalpy model processing paraffin；Choose VOF(Volume of Fluid) model treatment paraffin and
The Multiphase Flow of hot water；The eddy stress chosen in RNG k- ε two-equation model processing turbulent flow is assumed.The governing equation packet
It includes:
Wherein:α n It isnThe volume fraction of kind fluid in a control unit,u i For the velocity component on the direction x,u j For the direction y
On velocity component,τFor the time,x i For the x-axis under cartesian coordinate,x j For the y-axis under cartesian coordinate,ρFor the close of paraffin
Degree,μFor the dynamic viscosity of paraffin liquid phase,PFor pressure,g i For acceleration of gravity,S i For momentum source term,kFor thermal coefficient,HFor
Sensible heat enthalpy；
Three, it according to the governing equation and oil-field hot-washing wax remover site technique condition of step 2 foundation, is carried out using CFD software non-steady
State numerical simulation: the boundary condition in setup algorithm region divides zoning grid according to the three-dimensional structure, sets hot water
The boundary condition of entry zone is speed entrance, sets the boundary condition in hot water outlet region as free export, sets outside pipeline
The boundary condition on surface is adiabatic boundary, and the turbulent flow turbulence intensity and hydraulic diameter method of hot water inlet's boundary condition define；It builds
Vertical discrete equation determines that discrete primary condition and boundary condition, given solution control parameter, zoning are initialized and solved,
Observation residual error monitor has reached convergence by adjusting discrete equation, can show and export meter after convergence when not restraining
It calculates as a result, obtaining the analog result of melted paraffin wax in gathering line；The simulation knot of melted paraffin wax in gathering line described in wherein
Fruit includes temperature cloud picture, paraffin liquid phase cloud atlas and paraffin liquid fraction versus time curve.
Four, the analog result of melted paraffin wax in gathering line is analyzed, judges wax removal effect, it can be to wax deposition layer edge
There are carry out numerical simulation in the case of apparent compositional difference and obtain analog result on thickness direction.
Five, change technological parameter, technological parameter includes water temperature, flow velocity, re-starts step 3 ~ tetra-, analysis process parameter
Influence to wax removal effect.
Claims (4)
1. a kind of method for numerical simulation of gathering line hot-washing wax remover phase-change heat transfer, it is characterised in that: this gathering line hot wash
The method for numerical simulation of wax removal phase-change heat transfer the following steps are included:
One, content of wax gathering line threedimensional model is established using three-dimensional software；
Two, using paraffin in gathering line and hot water as research object, the governing equation of computation model, the governing equation packet are determined
It includes:
Wherein:α n It isnThe volume fraction of kind fluid in a control unit,u i For the velocity component on the direction x,u j For the direction y
On velocity component,τFor the time,x i For the x-axis under cartesian coordinate,x j For the y-axis under cartesian coordinate,ρFor the close of paraffin
Degree,μFor the dynamic viscosity of paraffin liquid phase,PFor pressure,g i For acceleration of gravity,S i For momentum source term,kFor thermal coefficient,HFor
Sensible heat enthalpy；
Three, it according to the governing equation and oil-field hot-washing wax remover site technique condition of step 2 foundation, is carried out using CFD software non-steady
State numerical simulation: the boundary condition in setup algorithm region divides zoning grid according to the three-dimensional structure, establishes discrete
Equation determines that discrete primary condition and boundary condition, given solution control parameter, zoning are initialized and solved, and is collected
The analog result of melted paraffin wax in defeated pipeline；
Four, the analog result of melted paraffin wax in gathering line is analyzed, judges wax removal effect；
Five, change technological parameter, technological parameter includes water temperature, flow velocity, re-starts step 3 ~ tetra-, analysis process parameter is to clear
The influence of wax effect.
2. the method for numerical simulation of gathering line hot-washing wax remover phase-change heat transfer according to claim 1, it is characterised in that: institute
It includes following method that the step of stating two, which establishes governing equation:
It selects FLUENT software to carry out simulation calculating, chooses the Phase-change Problems of enthalpy model processing paraffin；Choose VOF model treatment
The Multiphase Flow of paraffin and hot water；The eddy stress chosen in RNG k- ε two-equation model processing turbulent flow is assumed.
3. the method for numerical simulation of gathering line hot-washing wax remover phase-change heat transfer according to claim 2, it is characterised in that: institute
The boundary condition in three setup algorithm region of the step of stating include: set the boundary condition in hot water inlet region as speed entrance, if
The boundary condition for determining hot water outlet region is free export, sets the boundary condition of pipeline external surface as adiabatic boundary, hot water enters
The turbulent flow turbulence intensity and the definition of hydraulic diameter method of mouth boundary condition.
4. the method for numerical simulation of gathering line hot-washing wax remover phase-change heat transfer according to claim 3, it is characterised in that: institute
In the gathering line stated the analog result of melted paraffin wax include temperature cloud picture, paraffin liquid phase cloud atlas and paraffin liquid fraction at any time
Change curve.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110298080A (en) * | 2019-05-30 | 2019-10-01 | 中国船舶重工集团公司第七一九研究所 | Floating nuclear power plant warm water discharge thermal diffusion method for numerical simulation based on CFD |
| CN112796704A (en) * | 2019-10-28 | 2021-05-14 | 中国石油化工股份有限公司 | Optimization and parameter optimization method for oil well hot washing paraffin removal mode |
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| CN105426577A (en) * | 2015-11-02 | 2016-03-23 | 东北石油大学 | Figure simulation method for unsteady-state heat transfer process of large-sized crude oil floating-roof tank |
| CN105526729A (en) * | 2015-12-01 | 2016-04-27 | 中国科学院上海技术物理研究所 | Simulation analysis method of light-weight miniature coaxial pulse tube refrigerator based on CFD technology |
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Patent Citations (5)
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| CN103065001A (en) * | 2012-12-17 | 2013-04-24 | 华南理工大学 | Drying room process design method based on unstable state computational fluid dynamics (CFD) analog |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110298080A (en) * | 2019-05-30 | 2019-10-01 | 中国船舶重工集团公司第七一九研究所 | Floating nuclear power plant warm water discharge thermal diffusion method for numerical simulation based on CFD |
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| CN112796704A (en) * | 2019-10-28 | 2021-05-14 | 中国石油化工股份有限公司 | Optimization and parameter optimization method for oil well hot washing paraffin removal mode |
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Application publication date: 20190222 |