Well control geological reserve prediction method and system

Abstract

The invention provides a well control geological reserve prediction method and system. The well control geological reserve prediction method comprises the following steps of executing the following iterative processing, specifically, calculating the normalized yield at each moment; calculating the material balance quasi-time of each moment according to a well control geological reserve initial value; generating a plurality of reciprocal coordinate points according to the reciprocal of the normalized yield at each moment and the material balance quasi-time at each moment; fitting the pluralityof reciprocal coordinate points to obtain the slope of a fitting curve; calculating well control geological reserves according to the slope; judging whether the absolute value of the difference between a well control geological reserve prediction value and a well control geological reserve initial value is smaller than preset first precision or not; and when the precision is smaller than the preset first precision, ending iteration, taking the well control geological reserves as well control geological reserve prediction value, otherwise, enabling the well control geological reserves to replace the well control geological reserve initial values, and executing the iteration processing continuously. According to the method, the well control geological reserves can be accurately predicted, the natural gas development process is further effectively guided, and the natural gas recovery rate is increased.

Description

technical field [0001] The invention relates to the field of natural gas development, in particular to a method and system for predicting well-controlled geological reserves. Background technique [0002] Shale gas reservoirs are a special type of gas reservoirs in which free gas and adsorbed gas coexist, and industrial production capacity can be obtained by forming "artificial gas reservoirs" through volume reconstruction. Well-controlled geologic reserves of shale gas reservoirs refer to the original geologic reserves corresponding to the effective production range (mainly consistent with the volume reformation area) of shale gas reservoirs, including free gas reserves and adsorbed gas reserves. Three methods are usually used in the evaluation of geological reserves, namely the volumetric method, the material balance method and the production decline method. The volumetric method and the material balance method are used to predict the original geological reserves of natur...

AI Technical Summary

Problems solved by technology

Estimated reserves can be highly inaccurate as volumetric methods rely on detailed knowledge of reservoir properties (often unknown, such as shale gas producing area, height, etc.)

The production decline method uses the dynamic data of the gas reservoir, but only predicts the recoverable natural gas reserves under the current operating conditions. If the operating conditions change, it will cause changes in the natural gas production and recoverable reserves. It is difficult to determine the original gas reserves with the production decline method. Natural Gas Geological Reserves

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