Method and device for calculating dynamic filtration of carbon dioxide fracturing fracture

Abstract

The invention discloses a method and a device for calculating dynamic filtration of a carbon dioxide fracturing fracture. The method comprises the steps that parameter information of a target well is obtained; a shaft temperature field model, a shaft pressure field model, a fracture temperature field model and a fracture pressure field model are established separately; a fracture temperature field and a fracture pressure field are obtained by coupling the models; based on the fracture temperature field and the fracture pressure field, a carbon dioxide fracturing stress field model, a migration model of a propping agent in the fracture and a filtration model of carbon dioxide from the fracture to a matrix are solved in a coupling mode, and the filtration speed of the carbon dioxide from the fracture to the matrix is obtained; and based on the filtration speed of the carbon dioxide from the fracture to the matrix, the accumulated filtration amount of the carbon dioxide from the fracture to the matrix is calculated. According to the method and the device, the filtration speed and the accumulated filtration amount of the carbon dioxide in the dynamic filtration process can be calculated more accurately, and therefore the carbon dioxide using amount can be designed more reasonably to achieve yield increase.

Description

technical field [0001] The present application relates to the technical field of oil and gas field development, in particular to a method and device for calculating dynamic fluid loss of carbon dioxide fracturing fractures. Background technique [0002] Hydraulic fracturing technology, as one of the measures to increase production of oil and gas wells and increase injection of water wells, has been widely used in my country at present. Although hydraulic fracturing has achieved good results in reservoir stimulation, it also exposed many problems, especially in the development of shale gas. The permeability of the shale gas matrix is ​​extremely low, and it is extremely vulnerable to damage by fracturing fluid during production stimulation, resulting in a decrease in production. [0003] Compared with hydraulic fracturing technology, waterless fracturing has greatly alleviated the pressure of dependence on water resources. At present, waterless fracturing mainly includes ca...

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Problems solved by technology

[0004] Due to the special properties of carbon dioxide, strong sensitivity to temperature and pressure, and the supercritical state of carbon dioxide in the fracture and matrix during the fracturing process, it has the characteristics of low viscosity and easy diffusion, so the traditional static fluid loss coefficient is used to describe the filtration of carbon dioxide. There will be a large error in the loss process, and it will no longer be adaptive.

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