Numerical simulation method for interphase convection of water gasoline three-phase seepage fluid

A numerical simulation, three-phase technique, applied in the field of subsurface fluid seepage

Active Publication Date: 2018-05-29
HOHAI UNIV +1
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Problems solved by technology

[0004] The purpose of the present invention is to overcome the deficiencies in the prior art, provide a numerical simulation method for water-gasoline three-phase percolation interphase convection, and solve the problem of quantitative analysis of multiphase flow displacement when the saturation difference of each phase is too large in the prior art technical problem

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  • Numerical simulation method for interphase convection of water gasoline three-phase seepage fluid
  • Numerical simulation method for interphase convection of water gasoline three-phase seepage fluid
  • Numerical simulation method for interphase convection of water gasoline three-phase seepage fluid

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Embodiment 1

[0159] The three-dimensional model to be simulated in this embodiment is as figure 1 As shown, a three-dimensional seepage area of ​​isotropic medium is established, with a size of 15m×300m×15m. The area is meshed by a pre-processing program, and the mesh is divided into 10×10×100 grid units to obtain its Element and node number information.

[0160] Set the pressure head at the inflow boundary as 3015m, and the pressure head at the outflow boundary as 15m, and obtain the model boundary information file through program processing. Set the parameters as shown in Table 1, and write it as a parameter file:

[0161] Parameter setting table 1

[0162]

[0163] Set the initial water phase saturation to 30%, the gas phase saturation to 0.1%, and the oil phase saturation to 69.9%. This time, convection is the main research object, so a smaller diffusion coefficient is used. By running the multiphase flow finite element program, a series of data files FLD_J_T.TXT can be obtained,...

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Abstract

The invention discloses a numerical simulation method for the interphase convection of a water gasoline three-phase seepage fluid. The method comprises the steps of carrying out discrete solution on awater gasoline three-phase seepage fluid differential equation by using a Galerkin finite element method; determining a shape function by using an eight-node unit body; establishing a linear algebraic equation set through a weighted residual integral and carrying out iterative solution on the algebraic equation set at a unit discrete node by using a midpoint incremental method; correcting possible non-convergent solutions according to the condition that the saturation is 1; and correcting by adopting a method of redefining the paclet number for the numerical oscillation problem caused by convection domination. The method disclosed by the invention has the beneficial effects that the convection influence is considered; the change of a pressure head and the change of the saturation of the water gasoline three phases can be predicted; the simulation results are closer to the actual engineering situation; the computational displacement time can be greatly shortened; and the groundwater oil pollution treatment efficiency and the oil reservoir energy mining efficiency are increased; and an important guarantee is provided for the technical analysis and exploration of the current underground fluid seepage.

Description

technical field [0001] The invention relates to a numerical simulation method for water-gasoline three-phase seepage interphase convection, and belongs to the technical field of underground fluid seepage. Background technique [0002] In the process of oil reservoir exploitation, petroleum substances move and spread laterally along the unsaturated zone of groundwater, affecting the surrounding geology, water quality environment and people's urban domestic water, and even causing major environmental pollution and property loss. Therefore, it is urgent to control the problem of petroleum pollution in groundwater. [0003] Petroleum that infiltrates into groundwater is considered as a non-aqueous liquid. When the density of petroleum is less than that of water, the oil component cannot submerge, and the process of its infiltration into the ground belongs to multiphase flow seepage. At present, in the seepage process of multiphase flow, there will be mutual influence of physical...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/13
CPCG06F17/13
Inventor 詹美礼魏源郑惠峰闫萍盛金昌罗玉龙刘星星黄泰仁鄢镜孙来
Owner HOHAI UNIV
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