Novel method for analyzing reservoir physical properties by using pressure drop section data in shale gas reservoir fracturing construction

Abstract

The invention discloses a novel method for analyzing reservoir physical properties by using pressure drop section data in shale gas reservoir fracturing construction. According to the method, change data of oil pressure and discharge capacity along with the construction time in the fracturing process is accurately read from a fracturing construction curve, and abnormal data with the fluctuation amplitude greater than 1 percent is removed; dimensionless pressure is defined, and the pressure drop section time is converted into a dimensionless form; and a theoretical dimensionless pressure value is calculated, the dimensionless pressure data is compared with the theoretical dimensionless pressure value, and if the error exceeds 1 percent, a trial and error method is used for re-adjusting the reservoir physical property permeability, the dimensionless storage coefficient, the single-well control radius and the dimensionless analytic parameter coefficient until the calculation precision is reached. The novel method has the beneficial effects that the pressure drop section data in the shale gas reservoir fracturing construction is used for analyzing the result accuracy of the reservoir physical properties, and the data utilization rate of the fracturing construction data is improved.

Description

technical field [0001] The invention belongs to the field of post-pressurization effect evaluation of shale gas reservoirs, and relates to a pressure drop data analysis method, in particular to a new method for analyzing reservoir physical properties by using the data of the pressure drop section of shale gas reservoir fracturing construction. Background technique [0002] The fracturing construction process is a typical injection pressure drop process. The pressure drop section data during the fracturing fluid flowback process can basically reflect the formation and stimulation information. The role of the pump stop pressure drop curve in the understanding of reservoir physical properties in the process of fracturing construction is studied. The pump stop pressure during the fracturing process is the wellhead pressure at the instant the pump is stopped. At this time, the wellbore friction has been eliminated. It is only different from the bottom hole pressure by the hydrost...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a new method for analyzing the physical properties of the reservoir by using the pressure drop data of the shale gas reservoir fracturing construction to analyze the physical properties of the reservoir, which solves the problem that the existing method is not accurate enough to analyze the physical properties of the reservoir

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