Fractured horizontal well full wellbore pressure calculation method and device and computer readable storage medium

Abstract

The invention discloses a fractured horizontal well full wellbore pressure calculation method and device and a computer readable storage medium, and belongs to the technical field of oil and gas reservoir numerical simulation. The method comprises the following steps that basic parameters are collected, and a formation flow full implicit mathematical model based on an embedded discrete fracture model is established; solving the fully implicit mathematical model by using the inner boundary of the fixed gas production rate; calculating wellbore pressure change of each fracturing section of the horizontal well; calculating the bottom hole pressure of each crack initiation point; the steps 2-4 are iteratively circulated until iteration variables converge, and the flowing bottomhole pressure and the bottomhole pressure of the crack initiation point of each crack at the time step are obtained; shaft pressure and wellhead casing pressure of the vertical well section and the inclined section under the time step are calculated; and the steps 2-6 are circulated, and the whole shaft pressure at different production times is obtained. The invention provides a method for predicting the change rule of the full wellbore pressure and the wellhead casing pressure by using the yield data in the absence of the bottom hole pressure test data, and the method has a practical value for accurately predicting the production dynamics of the gas reservoir fractured horizontal well.

Description

technical field [0001] The invention relates to the technical field of numerical simulation of oil and gas reservoirs, in particular to a method, a device and a computer-readable storage medium for calculating the full wellbore pressure of a fracturing horizontal well. Background technique [0002] Unconventional shale gas reservoirs, tight gas reservoirs and other original reservoirs generally have low porosity and permeability, and low natural depletion production. In order to obtain industrial production capacity, it is necessary to generate multiple artificial fracturing fractures through long horizontal section + hydraulic fracturing technology to improve the seepage capacity of unconventional reservoirs. In the past research, it is generally believed that the production of each artificial fracture is equal, and the pressure loss in the wellbore is ignored, and the fracturing horizontal well is regarded as having infinite conductivity. However, the actual situation is ...

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Problems solved by technology

However, the actual situation is that due to the heterogeneity of the reservoir and the interference between fractures in the production process, the production of each artificial fracture is not equal

In addition, due to the inflow of reservoir fluid, the flow in the wellbore in the horizontal section is a multiphase mass flow, which will cause frictional pressure drop, gravity pressure drop, and accelerated pressure drop caused by the influx of fluid in fractures; at the same time, the horizontal The pressure change in the wellbore will also affect the fluid inflow of each fracture in turn, resulting in the change of the productivity of each fracture

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