A method for simulating gas-liquid two-phase seepage characteristics in natural shale fractures
A technology for natural fractures and medium gas, applied in earthwork drilling, special data processing applications, wellbore/well components, etc., can solve the problem of poor repeatability of experiments, restrictions on gas-liquid two-phase flow characteristics of shale natural fractures, and experimental conditions Control the problems of low accuracy, achieve the effect of saving experimental material funds, saving experimental time, and improving recognition accuracy
Active Publication Date: 2021-06-29
SOUTHWEST PETROLEUM UNIV
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Problems solved by technology
Since the width of natural fractures in the reservoir is concentrated in the range of 0.1mm-36mm, there are certain difficulties and observation errors in simulating the gas-liquid flow characteristics in such micro-scale channels through laboratory experiments. The fracturing fluid used in the field is a non-Newtonian fluid and the experiment There are also large differences in laboratory Newtonian fluid simulations, and the difficulty in making experimental models, poor experimental repeatability, and low accuracy of experimental condition control seriously restrict the understanding of gas-liquid two-phase flow characteristics in natural shale fractures.
With the gradual maturity of computer hardware and computational fluid dynamics theory, the use of computational fluid dynamics (CFD) simulation technology to study gas-liquid flow in micro-scale channels has become a reliable means, but the existing general-purpose CFD software is a closed business Software, there are limitations in the transplantation of algorithms and self-modification of formulas
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Embodiment 1
[0043] Step 1. Based on the ANSYS DesignModeler module, establish a T-shaped pipe model. The vertical pipe of the T-shaped pipe model is the gas-liquid two-phase outlet, the upper end of the vertical pipe is the liquid phase inlet, the lower end is the gas phase inlet, and the horizontal pipe is the two-phase outflow.
[0044] Create a three-dimensional T-shaped pipe model in the ANSYS DesignModeler module. The upper part of the vertical pipe of the T-shaped pipe is the liquid phase inlet, the lower part is the gas phase inlet, the horizontal pipe is the gas-liquid two-phase outlet, and the outlet pressure is set to 0MPa (the outlet pressure setting can be adjusted according to the needs, this embodiment only gives a setting possibility sex, the model is attached figure 1 shown). The positions of the gas-liquid two-phase inlet and outlet can be adjusted according to actual needs, and are not limited to the above expressions, which are just an inlet and outlet method given in ...
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The invention discloses a method for simulating gas-liquid two-phase seepage characteristics in natural shale fractures, comprising the following steps: step 1, establishing a T-shaped pipe model, one end of the vertical pipe is a liquid phase inlet, the other end is a gas phase inlet, and the horizontal pipe is the two-phase flow outlet; step 2, mesh the T-shaped pipe model established in step 1 into hexahedral grids; step 3, establish the continuous type equation, phase equation and Momentum equation, use the interFoam solver in OpenFoam to solve it; Step 4, call the T-shaped pipe grid model in Step 2, and iteratively calculate the equation after solving in Step 3 through time steps, and the entire T-shaped Changes in gas-liquid flow characteristics in the tube. Compared with indoor experiments, the present invention can save experimental time, experimental materials and funds, and improve recognition accuracy; compared with the use of commercial computational fluid dynamics software, the method has the advantages of portability of underlying algorithms and self-modification of formulas, and improves the accuracy of various working conditions. applicability.
Description
technical field [0001] The invention relates to the technical field of coal-measure gas exploitation, in particular to a method for simulating gas-liquid two-phase seepage characteristics in shale natural fractures. Background technique [0002] Natural fractures are widely developed in shale reservoirs, and natural fractures are the main channels for gas to flow from matrix to fractured fractures. After hydraulic fracturing, the natural fractures of the reservoir contain a large amount of retained fracturing fluid, and the presence of fracturing fluid has a significant impact on the flow characteristics of shale gas desorption. Since the width of natural fractures in the reservoir is concentrated in the range of 0.1mm-36mm, there are certain difficulties and observation errors in simulating the gas-liquid flow characteristics in such micro-scale channels through laboratory experiments. The fracturing fluid used in the field is a non-Newtonian fluid and the experiment There...
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IPC IPC(8): E21B49/00G06F30/20
CPCE21B49/00G06F30/20
Inventor 张烈辉黄鑫吴婷婷袁山张博宁张芮菡张墨
Owner SOUTHWEST PETROLEUM UNIV