Water injection growth crack numerical simulation method and device for embedded discrete crack

Abstract

The invention discloses a water injection growth crack numerical simulation method and device for an embedded discrete crack. The method comprises the steps that a kinetic model of crack initiation, extension and closing tendency is established based on geological parameters and engineering parameters through employing kinetic theoretical analysis; and iterative coupling is performed on the kinetic model of crack initiation, extension and closing tendency and an oil reservoir numerical simulation program with an EDFM crack modeling function, and the evolution process of crack initiation, extension and closing tendency of a water injection growth crack is simulated. The invention relates to an oil reservoir numerical simulation method capable of simulating and predicting the growth process(including the extension direction and the geometrical morphology) of dynamic fractures in real time. Dynamic extension of the water injection growth crack can be predicted and visually observed, so that an oil reservoir engineer is helped to formulate countermeasures such as pressure-limiting water injection, blockage removal and profile control, repeated fracturing and lateral matrix oil displacement, dynamic cracks are effectively prevented and controlled, an effective displacement system is established between injection and production wells, and the optimal water injection development effect is achieved.

Description

technical field [0001] The invention relates to the technical field of numerical simulation of oil reservoirs, in particular to a method and device for numerical simulation of water injection growth fractures with embedded discrete fractures. Background technique [0002] The geological conditions of fractured low-permeability sandstone reservoirs are generally characterized by low permeability, low porosity, low pressure, and low oil saturation, and natural micro-fractures are developed. Long-term exploitation of natural energy makes the underground deficit very serious, and water injection development is the only way for the sustainable development of this type of oilfield. The water injection dynamics show that during the long-term water injection development of fractured low-permeability reservoirs, the formation pressure gradually increases, forming a pressure hold. When the formation pressure exceeds the rock fracture or extension pressure, the rock formation will rup...

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Problems solved by technology

[0004] The embodiment of the present invention provides a water injection growth fracture numerical simulation method and device for embedded discrete fractures, which are used to solve the problem that the opening and extension characteristics of dynamic fractures in the water injection process depend on empirical formulas, and the model is too simple and the scope of application is limited.

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