Method for calculating bottom hole pressure solution after shale gas reservoir vertical well fracturing transformation

Abstract

The invention provides a method for calculating a bottom hole pressure solution after shale gas reservoir vertical well fracturing transformation. The method comprises the following steps: establishing a physical hypothesis of a shale gas reservoir vertical well test mathematical model considering radial composite characteristics and adsorption and desorption characteristics, and establishing a corresponding shale gas reservoir vertical well test mathematical model; and realizing linearization of the mathematical model by selecting a reasonable quasi-pressure function. Necessary dimensionlesstransformation and Laplace transformation are adopted to achieve calculation of the bottom hole pressure solution after shale gas reservoir vertical well fracturing transformation. Compared with the prior art, the vertical well test mathematical model suitable for the composite shale gas reservoir is established, the corresponding bottom hole pressure expression is provided, and the method has important practical significance in guiding shale gas reservoir pressure monitoring operation.

Description

technical field [0001] The invention relates to the field of shale gas reservoir development and dynamic monitoring, in particular to a calculation method for bottomhole pressure solution after fracturing of vertical wells in shale gas reservoirs. Background technique [0002] Shale gas reserves are huge in the world, and its development potential is huge. With the development of hydraulic fracturing technology, the effects and benefits of shale gas reservoir development have gradually improved, and its role in the world's energy supply has become increasingly important. Since shale gas reservoirs have no natural production capacity and require fracturing to build production, realizing real-time and accurate quantification of fracturing effects is of great significance to the development of shale gas reservoirs. The pressure dynamic monitoring technology based on the bottom hole pressure change analysis is one of the few technologies that can meet the requirements. [0003...

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Problems solved by technology

[0005] The main purpose of the embodiments of the present invention is to provide a method for calculating the bottomhole pressure solution of vertical wells in shale gas reservoirs after fracturing, so as to solve the current lack of bottomhole pressure in vertical wells in shale gas reservoirs that simultaneously considers radial composite characteristics and adsorption and desorption characteristics. solve the problem

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