Prediction method and device for reserves and water invasion of water-drive gas reservoir

Abstract

The embodiment of the invention provides a prediction method and device for reserves and water invasion of a water-drive gas reservoir. The method comprises the following steps: acquiring reservoir physical property parameters of a gas reservoir and production dynamic data of the gas reservoir; determining the substance balance equation of the gas reservoir based on the elastic expansion effect ofbound water and rock particles, and establishing a first linear regression model; establishing a second linear regression model according to the material balance equation and the first linear regression model; and predicting the reserves and the water invasion amount of the gas reservoir according to the reservoir physical property parameters, the production dynamic data, the first linear regression model and the second linear regression model, thereby improving the prediction efficiency and accuracy of the reserves and the water invasion amount.

Description

technical field [0001] The embodiments of this specification relate to the field of gas reservoir development, and in particular to a method and device for predicting reserves and water influx of water drive gas reservoirs. Background technique [0002] With the improvement of exploration technology, more and more abnormally high-pressure gas reservoirs have been discovered. Accurately estimating the reserves and water influx of abnormally high-pressure gas reservoirs plays an extremely important role in analyzing and predicting gas reservoir dynamics and gas reservoir development planning. Common methods for estimating gas reservoir reserves mainly include: material balance method, well testing method, volumetric method and empirical algorithm. The accuracy of the volumetric method is closely related to the accuracy of the geological data. With the abundance of geological data, the accuracy of the volumetric method is getting higher and higher, but the acquisition of geolo...

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Problems solved by technology

Most of the methods that can simultaneously calculate the water influx and reserves of water drive gas reservoirs are to add the conventional water influx calculation method to the material balance equation of water drive gas reservoirs, and then assume the water body for trial calculation. The optimal solution cannot be tested, or there may be situations where the fitting accuracy is not much different in the case of multiple water body multiples, and the conventional water influx calculation method used in this type of method is not necessarily suitable for an actual gas reservoir of

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