Unsteady fluid-structure interaction multiphase seepage model construction method

Abstract

The invention discloses an unsteady fluid-solid coupling multiphase seepage model construction method which comprises the following steps: analyzing unsteady flow of fluid in a pore throat channel according to a core scale pore network in combination with an unsteady flow model to obtain axial velocity distribution of the fluid in a circular tube bundle; respectively constructing an unsteady single-phase liquid fluid-solid coupling seepage mathematical model and an unsteady single-phase gas fluid-solid coupling seepage mathematical model; utilizing the unsteady single-phase liquid fluid-solid coupling seepage mathematical model and the unsteady single-phase gas fluid-solid coupling seepage mathematical model, and combining the characteristic parameters of the mixed fluid in the pore network model to construct a fluid-solid coupling multiphase seepage mathematical model in the immiscible phase displacement process; and combining the core digital pore network model with an unsteady fluid-solid coupling multiphase seepage numerical simulation method to perform core fluid-solid coupling seepage simulation. The indoor rock core flow experiment process can be simulated and reproduced, and digital single-phase and multiphase fluid-solid coupling seepage simulation analysis and testing of the indoor rock core are achieved.

Description

technical field [0001] The invention relates to the field of oil and gas field development, in particular to a construction method of an unsteady fluid-solid coupling multiphase seepage model, which is applicable to conventional sandstone oil and gas reservoirs, as well as unconventional oil and gas reservoirs such as tight oil and gas, shale oil and gas, and natural gas hydrate, and is also applicable to CO2 geological storage technology. Background technique [0002] Oil and natural gas are one of the important energy sources to maintain the rapid development of the national economy. How to rationally exploit oil and natural gas and increase its recovery has always been an important issue in the development of oil and gas fields. The internal pore-throat structure of actual underground reservoir rocks is complex, and it is difficult to clarify the law of fluid seepage through experiments. Many researchers use porous media models to simulate the flow of different types of ...

AI Technical Summary

Problems solved by technology

In the process of pore network simulation, it is considered that the flow of single-phase or two-phase fluid in any node obeys Kirchoff’s law, that is, the sum of the flows flowing into and out of the node, and the fluid pressure can be instantaneously transmitted from the inlet to the outlet, but the actual fluid usually With compressibility, the pressure wave cannot propagate instantaneously, so the influence of the pressure wave on the fluid flow cannot be accurately restored

Images