An Integrated Numerical Simulation Method of Pressure and Production with Full Coupling of Reservoir Flow

Abstract

The present invention relates to an integrated numerical simulation method of pressure-production with full coupling of reservoir flow, which comprises the following steps in sequence: (1) establishing structured reservoir grids and initial units of fractures; (2) calculating artificial fractures during the fracturing process Half-length, width distribution of artificial fractures, fluid pressure distribution in artificial fractures, matrix oil phase pressure distribution and matrix liquid phase saturation distribution; (3) Calculation of reservoir pressure distribution and reservoir water saturation distribution during oil well flowback-production process ; (4) Calculate the productivity of the oil well. The invention adopts a structured grid and an embedded discrete fracture model, and the use of the structured grid can facilitate the processing of reservoir boundary problems. The embedded discrete fracture model has the advantages of simple grid division, fast calculation, and easy processing of complex fractures. The invention is used for simulating the fracturing, flowback and production process of oil reservoir development, and obtains the production dynamics of the oil well closer to the actual situation through the integration, so as to guide the fracturing construction and the design of the production system.

Description

technical field [0001] The invention belongs to the field of oil and gas field development, and in particular relates to an integrated pressure-production numerical simulation method based on an embedded discrete fracture model with full coupling of reservoir flow. Background technique [0002] With the continuous development of oil and gas resources, numerical simulation technology has been greatly applied in the development of oil and gas fields. In the fields of hydraulic fracturing, flowback after fracturing, and oil well production, numerical simulation methods can be used to predict and analyze the construction effect and oil well productivity, thereby providing reliable guidance for actual construction and production. [0003] At present, in the numerical simulation of oil and gas reservoir development process, the numerical simulation of fracturing construction and the numerical simulation of oil well flowback production process are relatively independent, and there ...

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Problems solved by technology

However, this method uses unstructured grids for simulation, which reduces the grid utilization rate, and has high requirements for computing equipment, and at the same time, it cannot realize the simulation of complex cracks.

Although this method gives the idea of ​​fracturing-production process simulation, the model does not consider the full coupling of reservoir flow, does not record the pressure change history during the hydraulic fracture expansion process, and fails to integrate the fracturing process with the flowback production process. Good combination, unable to simulate fracturing fluid water phase trap damage in ultra-low water saturation reservoirs

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