Unstructured dynamic mesh generation method and device

Abstract

The invention provides an unstructured dynamic mesh generation method and device. The method comprises the steps: generating a dynamic mesh generation result according to dynamic mesh generation parameters, wherein the dynamic mesh generation parameters comprise three-dimensional geologic model boundary information, discrete fracture mesh geometrical information and quality control parameters; generating an oil reservoir pressure value according to the dynamic mesh generation result; updating discrete fractures according to the oil reservoir pressure value; and updating a dynamic mesh generation result based on the updated discrete cracks. According to the method, the dynamic mesh generation result can be updated according to the dynamic mesh generation parameters, and dynamic efficient mesh generation is achieved.

Description

technical field [0001] This application relates to the field of oilfield development, in particular to a method and device for unstructured dynamic grid division. Background technique [0002] With the development of low-permeability oilfields and ultra-low-permeability oilfields, most low-permeability oilfields and ultra-low-permeability oilfields in my country have entered the medium-high water cut stage. At this stage, the main contradiction in oilfield development is reflected in the obvious directionality of water breakthrough in oil wells, which is specifically manifested in the fact that the water cut in the direction of the maximum horizontal principal stress of the stress field (referred to as the main direction well) rises stepwise, and the corresponding water injection well test The interpretation curve shows the characteristics of fracture seepage, the water absorption profile shows the peak-like water absorption of individual layers, and the tracer monitoring ha...

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Problems solved by technology

like image 3 As shown, there is an injection well (INJE) and a production well (PROD) in the study area. During the simulation, the propagation direction of the fracture is set in advance, and then the simulation is performed. This kind of simulation often cannot accurately reflect the dynamic change characteristics of the fracture. A simplified processing method with large simulation errors

[0006] Based on the above, the simulation of dynamic fractures by static unstructured grid subdivision technology needs to assume that the direction of fracture propagation is known, which leads to simulation errors, because in the process of water injection development, there is a fluid-solid coupling relationship between fluid and solid, and the actual direction of fracture propagation It needs to be calculated and determined in real time according to the stress field, pressure field and rock mechanics parameters of the regional location, and cannot be predicted in advance

Therefore, the static unstructured meshing technology cannot be used in actual models where the crack initiation location and propagation direction are uncertain

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