CN111400950A - Hydrate slurry multiphase pipeline transient flow simulation method and device - Google Patents
Hydrate slurry multiphase pipeline transient flow simulation method and device Download PDFInfo
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Abstract
The invention provides a method and a device for simulating the transient flow of a hydrate slurry multiphase pipeline, wherein the method comprises the steps of generating a gas-hydrate slurry multiphase flow transient model in the pipeline according to a gas-liquid phase control equation, a hydrate particle phase control equation and a hydrate generation dynamic model which are generated in advance so as to simulate the multiphase transient flow state of the hydrate slurry in the pipeline, establishing a staggered grid on the gas-hydrate slurry multiphase flow transient model, discretizing the gas-hydrate slurry multiphase flow transient model on the staggered grid, and solving the gas-hydrate slurry multiphase flow transient model after the staggered grid is established by using a SIMP L E algorithm.
Description
Technical Field
The invention relates to the technical field of petroleum and natural gas gathering and transportation, in particular to the field of oil-gas field development and oil-gas-water mixed transportation pipeline flow safety guarantee, and specifically relates to a hydrate slurry multiphase pipeline transient flow simulation method and device.
Background
The gas hydrate is a non-stoichiometric cage-shaped crystal substance formed by water and small molecule gases such as methane, ethane, carbon dioxide and the like under the conditions of high pressure and low temperature, and is also called as a cage-shaped hydrate. The water molecules forming the hydrate are called main water molecules, and the main water molecules are mutually connected through hydrogen bonds to form polyhedral cage-shaped cavities. Other constituent molecules that form hydrates are called guest molecules, and guest molecules of appropriate size can fill these cage cavities to provide stability. The empty hydrate cage acts like an efficient gas storage device, storing small molecule guest molecules. Up to 180 cubic meters of natural gas can be stored per cubic meter of hydrate.
In oil and gas field production, a three-phase mixture of oil, gas and water from a wellhead is conveyed to subsequent processing equipment through a pipeline. When the oil-gas-water mixed transportation pipeline is in a low-temperature and high-pressure condition, the hydrate is easy to generate in the pipeline. Once the hydrates are formed in the pipeline, the viscosity of the liquid phase rises dramatically. Moreover, hydrate can adhere at the pipe wall, forms the hydrate sedimentary deposit, reduces the pipeline sectional area, finally leads to the pipe blockage, brings very big harm for oil and gas field production and pipeline transportation safety, is the important problem that pipeline transportation flow safety guarantee needs urgent research and solution. As a novel hydrate blockage prevention and control means, hydrate slurry conveying technology is gradually concerned by researchers in the petroleum industry and at home and abroad. The accurate simulation of the multiphase flow of the hydrate slurry is the premise and the key of the application of the hydrate slurry conveying technology.
Disclosure of Invention
Aiming at the problems in the prior art, the method provided by the invention can realize the accurate prediction of parameters such as hydrate generation rate, hydrate volume fraction, pipeline temperature, pressure drop, liquid holdup and the like in an oil-gas-water multiphase pipeline, and has important significance for research and industrial popularization and application in the aspects of multiphase mixed transportation pipeline hydrate flow safety guarantee, deep sea combustible ice mineral reserve development, hydrate slurry cold energy utilization and the like.
In order to solve the technical problems, the invention provides the following technical scheme:
in a first aspect, the present invention provides a method for simulating transient flow of a hydrate slurry multiphase pipeline, comprising:
generating a gas-hydrate slurry multiphase flow transient model in the pipeline according to a gas-liquid phase control equation, a hydrate particle phase control equation and a hydrate generation kinetic model which are generated in advance so as to simulate a hydrate slurry multiphase transient flow state in the pipeline;
establishing a staggered grid on the gas-hydrate slurry multiphase flow transient model, and discretizing the gas-hydrate slurry multiphase flow transient model on the staggered grid;
and solving the gas-hydrate slurry multiphase flow transient model after the staggered grids are established by utilizing a SIMP L E algorithm.
In one embodiment, the step of establishing the gas-liquid phase control equation comprises:
performing hydraulic calculation of the gas-liquid phase control equation by using a one-dimensional double-fluid model;
and performing thermodynamic calculation of the gas-liquid phase control equation by using an energy equation.
In one embodiment, the step of establishing the hydrate particle phase control equation comprises:
classifying the hydrate particles according to the particle size of the hydrate particles in the hydrate slurry;
generating a particle number density conservation equation of each type of hydrate particles;
calculating the velocity of the hydrate particles by using a momentum equation;
wherein the hydrate particle number density conservation equation is used for generating the particle size, number and speed change of the hydrate particles in the pipeline flowing process.
In one embodiment, the step of establishing the hydrate formation kinetic model comprises:
and generating the hydrate generation kinetic model by using a bidirectional shell growth method.
In one embodiment, the discretizing the gas-hydrate slurry multiphase flow transient model on the staggered grid comprises:
discretizing a convection term and a time term in the gas-hydrate slurry multiphase flow transient model by utilizing a first-order windward format and implicit difference.
In one embodiment, in the interleaved trellis, vectors are stored at the boundaries of the interleaved trellis and scalars are stored in the middle of the interleaved trellis.
In a second aspect, the present invention provides a hydrate slurry multiphase pipeline transient flow simulation device, comprising:
the transient model generating unit is used for generating a gas-hydrate slurry multiphase flow transient model in the pipeline according to a gas-liquid phase control equation, a hydrate particle phase control equation and a hydrate generation dynamic model which are generated in advance; to simulate multiphase transient flow conditions of the hydrate slurry in the pipeline;
the grid creating and discretizing unit is used for establishing a staggered grid on the gas-hydrate slurry multiphase flow transient model and discretizing the gas-hydrate slurry multiphase flow transient model on the staggered grid;
and the transient model solving unit is used for solving the gas-hydrate slurry multiphase flow transient model after the staggered grids are established by utilizing the SIMP L E algorithm.
In one embodiment, the hydrate slurry multiphase pipeline transient flow simulation device further comprises:
a gas-liquid phase control equation establishing unit for establishing the gas-liquid phase control equation, the gas-liquid phase control equation establishing unit including:
the hydraulic calculation module is used for performing hydraulic calculation of the gas-liquid phase control equation by using a one-dimensional double-fluid model;
and the thermodynamic calculation module is used for performing thermodynamic calculation of the gas-liquid phase control equation by using an energy equation.
In one embodiment, the hydrate slurry multiphase pipeline transient flow simulation device further comprises:
the hydrate particle phase control equation establishing unit is used for establishing the hydrate particle phase control equation, and comprises:
the particle classification module is used for classifying the hydrate particles according to the particle sizes of the hydrate particles in the hydrate slurry;
the conservation equation generation module is used for generating a particle number density conservation equation of each type of hydrate particles;
the particle velocity calculation module is used for calculating the velocity of the hydrate particles by using a momentum equation;
wherein the hydrate particle number density conservation equation is used for generating the particle size, number and speed change of the hydrate particles in the pipeline flowing process.
In one embodiment, the hydrate slurry multiphase pipeline transient flow simulation device further comprises:
the hydrate formation kinetic model establishing unit is used for establishing the hydrate formation kinetic model, and the hydrate formation kinetic model establishing unit is specifically used for generating the hydrate formation kinetic model by using a bidirectional shell growth method.
In one embodiment, the grid creating and discretizing unit is specifically configured to discretize a convection term and a time term in the gas-hydrate slurry multiphase flow transient model by using a first-order windward format and implicit difference.
In one embodiment, in the interleaved trellis, vectors are stored at the boundaries of the interleaved trellis and scalars are stored in the middle of the interleaved trellis.
In a third aspect, the present invention provides an electronic device, including a memory, a processor, and a computer program stored on the memory and executable on the processor, wherein the processor implements the steps of the hydrate slurry multiphase pipeline transient flow simulation method when executing the program.
In a fourth aspect, the present invention provides a computer readable storage medium having stored thereon a computer program which, when executed by a processor, performs the steps of a hydrate slurry multiphase pipeline transient flow simulation method.
From the above description, it can be seen that the method and apparatus for simulating the transient flow of the hydrate slurry multiphase pipeline according to the embodiments of the present invention first establish a gas-liquid phase control equation, a hydrate particle phase control equation, and a hydrate generation kinetic model, then generate a gas-hydrate slurry multiphase flow transient model in the pipeline on the basis, and solve the gas-hydrate slurry multiphase flow transient model after the staggered grid is established by using the SIMP L E algorithm, thereby implementing an accurate simulation of the transient flow of the hydrate slurry multiphase pipeline.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a first schematic flow chart of a simulation method of transient flow of a hydrate slurry multiphase pipeline in an embodiment of the invention;
FIG. 2 is a second schematic flow chart of a simulation method of transient flow of a hydrate slurry multiphase pipeline in an embodiment of the invention;
FIG. 3 is a flow chart illustrating a step 400 according to an embodiment of the present invention;
FIG. 4 is a third schematic flow chart of a simulation method of transient flow of a hydrate slurry multiphase pipeline in an embodiment of the invention;
FIG. 5 is a flow chart illustrating step 500 according to an embodiment of the present invention;
FIG. 6 is a fourth schematic flow chart of a simulation method of transient flow of a hydrate slurry multiphase pipeline in an embodiment of the invention;
FIG. 7 is a flowchart illustrating a step 600 according to an embodiment of the present invention;
FIG. 8 is a flowchart illustrating step 300 according to an embodiment of the present invention;
FIG. 9 is a flow chart of a gas-hydrate slurry multiphase flow transient model solution according to an embodiment of the present invention;
FIG. 10 is a schematic flow chart of a simulation method of transient flow of a multiphase pipeline of hydrate slurry in an embodiment of the present invention;
FIG. 11 is a graph of the elevation change of mileage along the oil and gas mixture transportation pipeline in an embodiment of the present invention;
FIG. 12 is a schematic diagram of a steady-state temperature-pressure curve of a pipeline before and after pipeline derating in an embodiment of the present invention;
FIG. 13 is a schematic representation of the pipeline's whole course hydrate volume fraction as a function of time in an embodiment of the invention;
FIG. 14 is a schematic diagram showing the supercooling degree of the pipeline during the whole course of hydrate generation according to the embodiment of the present invention;
FIG. 15 is a schematic diagram showing the temperature of the pipe as a function of time throughout the process in an embodiment of the present invention;
FIG. 16 is a graph showing the variation of the average particle size of hydrate particles throughout the pipeline with time in an embodiment of the present invention;
FIG. 17 is a first schematic structural diagram of a hydrate slurry multiphase pipeline transient flow simulator in an embodiment of the invention;
FIG. 18 is a schematic structural diagram II of a hydrate slurry multiphase pipeline transient flow simulation device in an embodiment of the invention;
FIG. 19 is a schematic structural diagram III of a hydrate slurry multiphase pipeline transient flow simulator in an embodiment of the invention;
fig. 20 is a schematic structural diagram of a hydrate slurry multiphase pipeline transient flow simulator in an embodiment of the invention;
fig. 21 is a schematic structural diagram of an electronic device in an embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In view of the problem of pipeline blockage caused by hydrate in a pipeline in the prior art, but a method capable of accurately simulating multiphase flow of hydrate slurry in the pipeline is lacking at present, an embodiment of the present invention provides a specific implementation manner of a hydrate slurry multiphase pipeline transient flow simulation method, and referring to fig. 1, the method specifically includes the following contents:
step 100: and generating a gas-hydrate slurry multiphase flow transient model in the pipeline according to a gas-liquid phase control equation, a hydrate particle phase control equation and a hydrate generation kinetic model which are generated in advance so as to simulate a hydrate slurry multiphase transient flow state in the pipeline.
It will be appreciated that during actual production (e.g. pipeline shut-in, restart, production trim, pigging, etc.) multi-phase flow tends to be unstable. Therefore, the steady-state model can only reflect the change of the flow parameters in the space but cannot reflect the whole process of the flow state, and the pressure drop and flow change in the transient process are greatly different from the steady state, so that the steady-state model cannot meet the requirements of engineering only, and a gas-hydrate slurry multiphase flow transient model needs to be established to simulate the multiphase flow process in a pipeline, so that the design of oil-gas production is more reasonable.
Step 200: and establishing a staggered grid on the gas-hydrate slurry multiphase flow transient model, and discretizing the gas-hydrate slurry multiphase flow transient model on the staggered grid.
The grid interleaving in step 200 is to store and calculate scalar quantities (such as pressure, temperature, density, etc.) on normal grid nodes, and to store and calculate each component of the velocity on the grid after dislocation, respectively, and the center of the lattice after dislocation is located on the interface of the original control volume.
And 300, solving the gas-hydrate slurry multiphase flow transient model after the staggered grids are established by utilizing a SIMP L E algorithm.
From the above description, it can be seen that the hydrate slurry multiphase pipeline transient flow simulation method provided by the embodiment of the present invention firstly establishes a gas-liquid phase control equation, a hydrate particle phase control equation and a hydrate generation kinetic model, then generates a gas-hydrate slurry multiphase flow transient model in the pipeline on the basis, and solves the gas-hydrate slurry multiphase flow transient model after the staggered grid is established by using the SIMP L E algorithm, so as to implement accurate simulation of hydrate slurry multiphase pipeline transient flow.
In an embodiment, referring to fig. 2, the method for simulating transient flow of a hydrate slurry multiphase pipeline further comprises:
step 400: establishing the gas-liquid phase governing equation, referring specifically to FIG. 3, step 400 further comprises:
step 401: and performing hydraulic calculation of the gas-liquid phase control equation by using a one-dimensional two-fluid model.
When the step 401 is implemented, specifically, the following steps are performed: and performing hydraulic calculation by adopting a one-dimensional dual-fluid model, wherein the hydraulic calculation comprises two continuity equations and two momentum equations.
The continuity equation is as follows:
the momentum equation is as follows:
step 402: and performing thermodynamic calculation of a gas-liquid phase control equation by using an energy equation.
Thermodynamic calculations were performed using an energy equation: the energy equation is:
in the formulae (1) to (3), k ═ g and l denote a gas phase and a liquid phase, respectively, αkIs the volume fraction of the k-phase, of which ∑kαk＝1.
Is the rate of change of mass of the k-phase, rho, due to mass exchange between hydrate formation and gas and liquid phaseskIs the density of the k phase, ukIs the velocity of the k-phase,kis the friction of the k phase; ekIs the total internal energy of the k-phase, wherein,
ekis the internal energy of the k-phase; hkIs the enthalpy value of the k-phase,
Qkis the amount of heat exchange between the k phase and the environment,
is an internal source of heat for the k-phase, such as the exotherm from hydrate formation; p is the system pressure.
In an embodiment, referring to fig. 4, the method for simulating transient flow of a hydrate slurry multiphase pipeline further comprises:
step 500: and establishing a control equation of the hydrate particle phase. Further, referring to fig. 5, step 500 further includes:
step 501: classifying the hydrate particles according to the particle size of the hydrate particles in the hydrate slurry.
Step 502: and generating a particle number density conservation equation of each type of hydrate particles.
Step 503: and calculating the velocity of the hydrate particles by using a momentum equation.
In steps 501 to 503, for the simulation of the hydrate particles, the hydrate particles are firstly divided into a plurality of classes according to the particle size of the hydrate particles, and equations (4) and (5) are established for each class by using the euler method to describe the changes of parameters such as the particle size, the number, the speed and the like in the flowing process.
The conservation equation of particle number and density is shown below
Wherein the subscript n represents the class of hydrate particles; sigmanIs the volume number density of the n-th type hydrate particles and represents a specificThe number of hydrate particles in unit volume; u. ofnIs the average velocity of the nth hydrate particle; source term phinRepresents the rate of change of the number of type n hydrate particles due to flow and hydrate formation within the current control volume; dnIs the average particle size of the nth type of hydrate particles in the current control body; source term phiDnRepresenting the variation in the particle size and number of the n-th type particles due to hydrate formation.
The velocity of the hydrate particles in a single class was calculated using the formula:
wherein, FnRepresenting the combined force on the type n hydrate particles, mnIs the mass of the nth type hydrate particles.
In an embodiment, referring to fig. 6, the method for simulating transient flow of a hydrate slurry multiphase pipeline further comprises:
step 600: establishing the hydrate formation kinetic model, and further referring to fig. 7, the step 600 specifically includes:
step 601: and generating the hydrate generation kinetic model by using a bidirectional shell growth method.
The following two-way shell growth model was used to describe the kinetics of hydrate formation in water-in-oil emulsion systems, assuming that hydrate nucleation occurs only at the surface of water droplets dispersed in the oil phase.
Wherein r isinIs the internal diameter of the hydrate shell structure, t is the reaction time, β is the hydrate structure parameter, MwIs the molar mass of water, pwIs the density of water, omegagsIs the concentration parameter, omega, of the gas component gs under system conditionseq，gsConcentration parameter of gas component gs under hydrate phase equilibrium condition, CH/o，gsIs the concentration of the gas component gs at the interface of the hydrate and the oil phase, Ceq，gsIs the concentration of the gas component gs at hydrate phase equilibrium conditions,
is a hydrate formation kinetic parameter of the gas component gs; r'inIs the internal diameter, r ', of the hydrate shell structure at the end of the previous time step'outIs the outer diameter of the hydrate shell structure at the end of the previous time step, Df，gsIs the diffusion coefficient, V, of the gas component gsw，H/OIs the volume of water that diffuses to the interface of the hydrate and oil phase at the current time step,His the pore parameter of the hydrate shell structure, gamma is the oil-water interfacial tension, muwIs the viscosity of the water and is,
only the inner diameter of the hydrate shell structure during the inward growth of the hydrate is considered at the current time step.
In one embodiment, referring to fig. 8, step 200 comprises:
step 201: discretizing a convection term and a time term in the gas-hydrate slurry multiphase flow transient model by utilizing a first-order windward format and implicit difference.
Equations (1) through (8) are solved using an interleaved grid in which vectors are stored at the grid boundaries and scalars are stored in the middle of the grid the control equations are discretized using a finite volume method, the convection term and time term are discretized using a first order windward format and implicit differences, and the solution is performed using the SIMP L E algorithm, see fig. 9.
The gas-liquid phase equation dispersion method is as follows:
wherein the superscript n represents the current time step, P represents the current control body, E and W represent the east and west sides of the control body respectively, E and W represent the east and west sides of the current control body respectively,
the energy equation dispersion method is as follows:
the conservation of number density equation for the hydrate particle phase is discretized as follows:
the particle size conservation equation is discretized as follows:
the hydrate particle momentum equation is discretized as follows:
it can be understood that the parameters such as hydrate generation rate, hydrate volume fraction, pipeline temperature, pressure drop, liquid holdup and the like in the oil-gas-water multiphase pipeline can be predicted by performing iterative calculation by using the determined calculation method.
From the above description, it can be seen that the hydrate slurry multiphase pipeline transient flow simulation method provided by the embodiment of the present invention firstly establishes a gas-liquid phase control equation, a hydrate particle phase control equation and a hydrate generation kinetic model, then generates a gas-hydrate slurry multiphase flow transient model in the pipeline on the basis, and solves the gas-hydrate slurry multiphase flow transient model after the staggered grid is established by using the SIMP L E algorithm, so as to implement accurate simulation of hydrate slurry multiphase pipeline transient flow.
To further illustrate the scheme, the invention provides a specific application example of the hydrate slurry multiphase pipeline transient flow simulation method by taking an actual industrial pipeline as an example, and the specific application example specifically comprises the following contents, and refer to fig. 10.
The present embodiment uses a simulation of an actual industrial pipeline to illustrate the applicability of the method. The length of the pipeline is 5780m, the height change of mileage is shown in figure 11, the inner diameter is 282.7mm, the ambient temperature is 6.5 ℃, the absolute roughness of the pipeline is 0.15mm, and the overall heat transfer coefficient is 30.2W/(m)2The temperature of an inlet is 58 ℃, the pressure of an outlet is fixed at 13.1MPa, the inlet flow is 55.7kg/s during normal production, the components of an inlet fluid are shown in the table 1, and the volume water content is 10%. Due to field modulation, the inlet flow rate will decrease linearly to 12.7kg/s in 900s (15 min). The curves of the temperature and the pressure in the pipeline under the steady state conditions before and after the reduction are shown in fig. 12, and it can be known that when the flow rate is reduced, the temperature and the pressure conditions at the rear section of the pipeline enter a hydrate generation area, and the danger of hydrate generation and blockage exists, so that the calculation method provided by the application is adopted to simulate the multiphase flow of the gas-hydrate slurry in the pipeline in the reduction process.
TABLE 1 fluid composition in the pipes (mol%)
C11+The molar mass and density of (A) are 195g/mol and 0.819g/cm, respectively3
S0: and generating a gas-hydrate slurry multiphase flow transient model in the pipeline according to a gas-liquid phase control equation, a hydrate particle phase control equation and a hydrate generation kinetic model which are generated in advance so as to simulate a hydrate slurry multiphase transient flow state in the pipeline.
S1: and establishing a staggered grid on the gas hydrate slurry multiphase flow transient model, and discretizing the gas-hydrate slurry multiphase flow transient model on the staggered grid.
And S2, solving the gas-hydrate slurry multiphase flow transient model after the staggered grids are established by utilizing a SIMP L E algorithm.
By using the methods in the steps S0 to S2, accurate prediction results of parameters such as hydrate generation rate, hydrate volume fraction, pipeline temperature, pressure drop, liquid holdup and the like can be obtained in the oil-gas-water multiphase pipeline.
As shown in fig. 13 to 16, the changes of the hydrate volume fraction, the temperature, the supercooling degree, and the hydrate particle radius with time in the pipe were observed at 15000s (4.17 hours) after the flow rate was reduced.
From the above description, it can be seen that the hydrate slurry multiphase pipeline transient flow simulation method provided by the embodiment of the present invention firstly establishes a gas-liquid phase control equation, a hydrate particle phase control equation and a hydrate generation kinetic model, then generates a gas-hydrate slurry multiphase flow transient model in the pipeline on the basis, and solves the gas-hydrate slurry multiphase flow transient model after the staggered grid is established by using the SIMP L E algorithm, so as to implement accurate simulation of hydrate slurry multiphase pipeline transient flow.
Based on the same inventive concept, the embodiment of the present application further provides a hydrate slurry multiphase pipeline transient flow simulation device, which can be used for implementing the method described in the above embodiment, as described in the following embodiment. Because the principle of the hydrate slurry multiphase pipeline transient flow simulation device for solving the problems is similar to that of the hydrate slurry multiphase pipeline transient flow simulation method, the implementation of the hydrate slurry multiphase pipeline transient flow simulation device can be realized by the hydrate slurry multiphase pipeline transient flow simulation method, and repeated parts are not described again. As used hereinafter, the term "unit" or "module" may be a combination of software and/or hardware that implements a predetermined function. While the system described in the embodiments below is preferably implemented in software, implementations in hardware, or a combination of software and hardware are also possible and contemplated.
The embodiment of the present invention provides a specific implementation manner of a hydrate slurry multiphase pipeline transient flow simulation device capable of implementing a hydrate slurry multiphase pipeline transient flow simulation method, and referring to fig. 17, the hydrate slurry multiphase pipeline transient flow simulation device specifically includes the following contents:
the transient model generating unit 10 is configured to generate a gas-hydrate slurry multiphase flow transient model in the pipeline according to a gas-liquid phase control equation, a hydrate particle phase control equation and a hydrate generation kinetic model generated in advance, so as to simulate a hydrate slurry multiphase transient flow state in the pipeline;
the grid creating and discretizing unit 20 is used for establishing a staggered grid on the gas-hydrate slurry multiphase flow transient model and discretizing the gas-hydrate slurry multiphase flow transient model on the staggered grid;
and the transient model solving unit 30 is used for solving the gas-hydrate slurry multiphase flow transient model after the staggered grids are established by utilizing the SIMP L E algorithm.
In one embodiment, referring to fig. 18, the hydrate slurry multiphase pipeline transient flow simulation apparatus further comprises:
a gas-liquid phase control equation establishing unit 40 for establishing the gas-liquid phase control equation, the gas-liquid phase control equation establishing unit 40 including:
a hydraulic calculation module 401, configured to perform hydraulic calculation of the gas-liquid phase control equation by using a one-dimensional two-fluid model;
and a thermodynamic calculation module 402, configured to perform thermodynamic calculation of the gas-liquid phase control equation by using an energy equation.
In one embodiment, referring to fig. 19, the hydrate slurry multiphase pipeline transient flow simulation apparatus further comprises:
a hydrate particle phase control equation establishing unit 50 configured to establish the hydrate particle phase control equation, where the hydrate particle phase control equation unit 50 includes:
a particle classification module 501, configured to classify hydrate particles in the hydrate slurry according to particle sizes of the hydrate particles;
a conservation equation generating module 502, configured to generate a particle number density conservation equation for each type of hydrate particles;
a particle velocity calculation module 503, configured to calculate a velocity of the hydrate particle using a momentum equation;
wherein the hydrate particle number density conservation equation is used for generating the particle size, number and speed change of the hydrate particles in the pipeline flowing process.
In one embodiment, referring to fig. 20, the hydrate slurry multiphase pipeline transient flow simulation apparatus further comprises:
the hydrate formation kinetic model establishing unit 60 is configured to establish the hydrate formation kinetic model, and the hydrate formation kinetic model establishing unit 60 is specifically configured to generate the hydrate formation kinetic model by using a bidirectional shell growth method.
In one embodiment, the mesh creation and discretization unit 30 is specifically configured to discretize the flow term and the time term in the gas-hydrate slurry multiphase flow transient model using a first-order windward format and implicit differences.
In one embodiment, in the interleaved trellis, vectors are stored at the boundaries of the interleaved trellis and scalars are stored in the middle of the interleaved trellis.
From the above description, it can be seen that the hydrate slurry multiphase pipeline transient flow simulation device provided by the embodiment of the present invention firstly establishes a gas-liquid phase control equation, a hydrate particle phase control equation and a hydrate generation kinetic model, then generates a gas-hydrate slurry multiphase flow transient model in the pipeline on the basis, and solves the gas-hydrate slurry multiphase flow transient model after the staggered grid is established by using the SIMP L E algorithm, so as to implement accurate simulation of hydrate slurry multiphase pipeline transient flow.
The embodiment of the present application further provides a specific implementation manner of an electronic device capable of implementing all steps in the hydrate slurry multiphase pipeline transient flow simulation method in the foregoing embodiment, and referring to fig. 21, the electronic device specifically includes the following contents:
a processor (processor)1201, a memory (memory)1202, a communication interface 1203, and a bus 1204;
the processor 1201, the memory 1202 and the communication interface 1203 complete communication with each other through the bus 1204; the communication interface 1203 is configured to implement information transmission between related devices, such as a server-side device, a metering device, and a client device.
The processor 1201 is configured to call the computer program in the memory 1202, and the processor executes the computer program to implement all the steps of the hydrate slurry multiphase pipe transient flow simulation method in the above embodiment, for example, the processor executes the computer program to implement the following steps:
step 100: and generating a gas-hydrate slurry multiphase flow transient model in the pipeline according to a gas-liquid phase control equation, a hydrate particle phase control equation and a hydrate generation kinetic model which are generated in advance so as to simulate a hydrate slurry multiphase transient flow state in the pipeline.
Step 200: and establishing a staggered grid on the gas-hydrate slurry multiphase flow transient model, and discretizing the gas-hydrate slurry multiphase flow transient model on the staggered grid.
And 300, solving the gas-hydrate slurry multiphase flow transient model after the staggered grids are established by utilizing a SIMP L E algorithm.
From the above description, it can be known that the electronic device in the embodiment of the present application firstly establishes a gas-liquid phase control equation, a hydrate particle phase control equation and a hydrate generation kinetic model, then generates a gas-hydrate slurry multiphase flow transient model in the pipeline on the basis, and solves the gas-hydrate slurry multiphase flow transient model after the staggered grid is established by using the SIMP L E algorithm, thereby implementing accurate simulation of hydrate slurry multiphase pipeline transient flow.
Embodiments of the present application also provide a computer readable storage medium capable of implementing all the steps in the hydrate slurry multiphase pipeline transient flow simulation method in the above embodiments, where the computer readable storage medium stores thereon a computer program, and the computer program when executed by a processor implements all the steps of the hydrate slurry multiphase pipeline transient flow simulation method in the above embodiments, for example, the processor implements the following steps when executing the computer program:
step 100: and generating a gas-hydrate slurry multiphase flow transient model in the pipeline according to a gas-liquid phase control equation, a hydrate particle phase control equation and a hydrate generation kinetic model which are generated in advance so as to simulate a hydrate slurry multiphase transient flow state in the pipeline.
Step 200: and establishing a staggered grid on the gas-hydrate slurry multiphase flow transient model, and discretizing the gas-hydrate slurry multiphase flow transient model on the staggered grid.
And 300, solving the gas-hydrate slurry multiphase flow transient model after the staggered grids are established by utilizing a SIMP L E algorithm.
From the above description, it can be seen that the computer-readable storage medium in the embodiment of the present application firstly establishes a gas-liquid phase control equation, a hydrate particle phase control equation and a hydrate generation kinetic model, then generates a gas-hydrate slurry multiphase flow transient model in a pipeline on the basis, and solves the gas-hydrate slurry multiphase flow transient model after the staggered grid is established by using the SIMP L E algorithm, thereby implementing accurate simulation of hydrate slurry multiphase pipeline transient flow.
The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, for the hardware + program class embodiment, since it is substantially similar to the method embodiment, the description is simple, and the relevant points can be referred to the partial description of the method embodiment.
The foregoing description has been directed to specific embodiments of this disclosure. Other embodiments are within the scope of the following claims. In some cases, the actions or steps recited in the claims may be performed in a different order than in the embodiments and still achieve desirable results. In addition, the processes depicted in the accompanying figures do not necessarily require the particular order shown, or sequential order, to achieve desirable results. In some embodiments, multitasking and parallel processing may also be possible or may be advantageous.
Although the present application provides method steps as in an embodiment or a flowchart, more or fewer steps may be included based on conventional or non-inventive labor. The order of steps recited in the embodiments is merely one manner of performing the steps in a multitude of orders and does not represent the only order of execution. When an actual apparatus or client product executes, it may execute sequentially or in parallel (e.g., in the context of parallel processors or multi-threaded processing) according to the embodiments or methods shown in the figures.
Although embodiments of the present description provide method steps as described in embodiments or flowcharts, more or fewer steps may be included based on conventional or non-inventive means. The order of steps recited in the embodiments is merely one manner of performing the steps in a multitude of orders and does not represent the only order of execution. When an actual apparatus or end product executes, it may execute sequentially or in parallel (e.g., parallel processors or multi-threaded environments, or even distributed data processing environments) according to the method shown in the embodiment or the figures. The terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, the presence of additional identical or equivalent elements in a process, method, article, or apparatus that comprises the recited elements is not excluded.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The principle and the implementation mode of the invention are explained by applying specific embodiments in the invention, and the description of the embodiments is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (10)
1. A hydrate slurry multiphase pipeline transient flow simulation method is characterized by comprising the following steps:
generating a gas-hydrate slurry multiphase flow transient model in the pipeline according to a gas-liquid phase control equation, a hydrate particle phase control equation and a hydrate generation kinetic model which are generated in advance so as to simulate a hydrate slurry multiphase transient flow state in the pipeline;
establishing a staggered grid on the gas-hydrate slurry multiphase flow transient model, and discretizing the gas-hydrate slurry multiphase flow transient model on the staggered grid;
and solving the gas-hydrate slurry multiphase flow transient model after the staggered grids are established by utilizing a SIMP L E algorithm.
2. The hydrate slurry multiphase conduit transient flow simulation method of claim 1, wherein the step of establishing the gas-liquid phase control equation comprises:
performing hydraulic calculation of the gas-liquid phase control equation by using a one-dimensional double-fluid model;
and performing thermodynamic calculation of the gas-liquid phase control equation by using an energy equation.
3. The method of simulating transient flow in a hydrate slurry multiphase pipeline according to claim 1, wherein the step of establishing the hydrate particle phase control equation comprises:
classifying the hydrate particles according to the particle size of the hydrate particles in the hydrate slurry;
generating a particle number density conservation equation of each type of hydrate particles;
calculating the velocity of the hydrate particles by using a momentum equation;
wherein the hydrate particle number density conservation equation is used for generating the particle size, number and speed change of the hydrate particles in the pipeline flowing process.
4. The hydrate slurry multiphase pipeline transient flow simulation method of claim 1, wherein the step of establishing the hydrate formation kinetic model comprises:
and generating the hydrate generation kinetic model by using a bidirectional shell growth method.
5. The hydrate slurry multiphase pipeline transient flow simulation method according to claim 1, wherein discretizing the gas-hydrate slurry multiphase flow transient model on the staggered grid comprises:
discretizing a convection term and a time term in the gas-hydrate slurry multiphase flow transient model by utilizing a first-order windward format and implicit difference.
6. The hydrate slurry multiphase pipeline transient flow simulation method of claim 1, wherein in the staggered grid, vectors are stored at the boundaries of the staggered grid and scalars are stored in the middle of the staggered grid.
7. A hydrate slurry multiphase pipeline transient flow simulation device is characterized by comprising:
the transient model generating unit is used for generating a gas-hydrate slurry multiphase flow transient model in the pipeline according to a gas-liquid phase control equation, a hydrate particle phase control equation and a hydrate generation dynamic model which are generated in advance; to simulate multiphase transient flow conditions of the hydrate slurry in the pipeline;
the grid creating and discretizing unit is used for establishing a staggered grid on the gas-hydrate slurry multiphase flow transient model and discretizing the gas-hydrate slurry multiphase flow transient model on the staggered grid;
and the transient model solving unit is used for solving the gas-hydrate slurry multiphase flow transient model after the staggered grids are established by utilizing the SIMP L E algorithm.
8. The hydrate slurry multiphase conduit transient flow simulation device of claim 7, further comprising:
a gas-liquid phase control equation establishing unit for establishing the gas-liquid phase control equation, the gas-liquid phase control equation establishing unit including:
the hydraulic calculation module is used for performing hydraulic calculation of the gas-liquid phase control equation by using a one-dimensional double-fluid model;
and the thermodynamic calculation module is used for performing thermodynamic calculation of the gas-liquid phase control equation by using an energy equation.
9. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor when executing the program performs the steps of the hydrate slurry multiphase conduit transient flow simulation method of any of claims 1 to 6.
10. A computer readable storage medium having stored thereon a computer program for performing the steps of the method of hydrate slurry multiphase pipeline transient flow simulation according to any one of claims 1 to 6 when executed by a processor.
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