CO2 enhanced shale gas reservoir development dynamic simulation method based on cross-scale multi-flow space gas transmission mechanism

Abstract

The invention discloses a CO2 enhanced shale gas reservoir development dynamic simulation method based on a cross-scale multi-flow space gas transmission mechanism. The method comprises the steps: establishing a double-pore / double-seepage numerical model through a multi-component multi-phase three-dimensional numerical simulator; carrying out logarithm interval encryption on the hydraulic fractureby adopting a local grid encryption technology; establishing three flowing spaces of a matrix, a natural fracture and a hydraulic fracture in the shale reservoir; respectively calculating the density, viscosity and molecular weight of the single-component and multi-component natural gas on the basis of a density, viscosity and molecular weight calculation formula; calculating the apparent permeability of the corresponding single-component and multi-component natural gas; giving an average pore radius and a certain pressure interval; and enabling the multi-component multi-phase three-dimensional numerical simulator to call the corresponding natural gas permeability correction factor at each time step based on the calculated pressure, so the purpose of correcting the Darcy constitutive is achieved.

Description

technical field [0001] The technical field of the present invention is the field of dynamic development simulation of shale reservoirs, and specifically relates to CO 2 Strengthen the dynamic simulation method of shale gas reservoir development. Background technique [0002] How to effectively utilize fossil fuel resources while reducing the impact of carbon dioxide emissions on environmental issues such as global warming and ocean acidification has always been one of the key issues that plague my country's sustainable development. One of the current effective solutions to this problem is carbon dioxide capture and storage (CCS), which is widely used around the world and effectively reduces carbon dioxide emissions. The adsorption capacity of shale to carbon dioxide is 4-20 times that of methane. The injection of carbon dioxide can not only replenish formation energy but also effectively replace methane in shale to increase the single well production of gas wells. Although ...

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Problems solved by technology

[0003] In order to solve the problems existing in the prior art, the purpose of the present invention is to provide a CO2 based on a cross-scale multi-flow space gas transport mechanism To strengthen the dynamic simulation method of shale gas reservoir development, the present invention can effectively overcome the limitation that the existing simulation method cannot objectively characterize multi-scale flow, and at the same time take into account the cost of modeling and calculation, and provide a new method for dynamic simulation of carbon dioxide enhanced shale gas reservoir development. Some new methods and new ideas

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