A Prediction Method of Recoverable Gas Quantity Applied to Low Permeability Gas Reservoirs and Gas Wells

Abstract

The invention discloses a recoverable gas volume prediction method applied to low-permeability gas pools and gas wells, which can predict the recoverable gas volume of a single well and the entire gas pool. The present invention mainly combines the production dynamic data and physical parameters of domestic similar typical low-permeability gas reservoirs, returns a large number of statistical samples, and fits the ratio G p The relationship between / Kh and differential pressure Δp is used in target low-permeability gas wells or gas reservoirs to predict their recoverable gas volume. The present invention collects data of four similar low-permeability gas reservoirs, and the fitted recoverable gas volume prediction formula is not only applicable to N gas reservoirs, but also applicable to other low-permeability gas reservoirs.

Description

technical field [0001] The invention belongs to the technical field of recoverable gas forecasting, and in particular relates to the design of a recoverable gas forecasting method applied to low-permeability gas reservoirs and gas wells. Background technique [0002] Recoverable gas volume refers to the cumulative gas volume that can be produced by a gas well or a gas reservoir at a certain formation pressure or when it reaches the final abandonment pressure. It reflects the production value of a gas well or gas reservoir and is an important guide for dynamic analysis and development adjustment of gas reservoirs significance. At present, the commonly used methods for calculating recoverable gas volume include pressure drop method, mathematical model method, production accumulation method, production decline method, etc. The pressure drop method requires accurate formation pressure measurement, which has high cost and harsh conditions; the mathematical model method and the p...

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Problems solved by technology

[0003] The purpose of the present invention is to solve the problems of difficult prediction of recoverable gas volume, difficult selection of high-yield construction sites, and harsh prediction conditions of traditional methods in new low-permeability gas wells or new gas reservoirs, and proposes a method for low-permeability gas reservoirs and gas wells. The recoverable gas volume prediction method can quickly and accurately calculate the recoverable gas volume of a gas well or gas reservoir under any formation pressure, and can also calculate the recoverable gas volume of a gas well or gas reservoir under pressure in the final abandoned formation

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