Method and device for predicting well productivity in gas-oil interaction area of ​​gas storage

Abstract

The invention discloses a gas storage gas-oil interaction region well productivity predicating method and device, wherein the method comprises the following steps that a function relationship between the gas reservoir net oil cutting quantity and the pressure is determined, and a study object well in a gas-oil interaction region in the gas storage rebuilding operation process is determined according to the function relationship; the gas reservoir development data or well test data of the study object well is processed, a binomial productivity equation of a gas well is obtained, and the influence factor of the gas-oil interaction displacement productivity reduction is determined; according to the influence factors of the gas-oil interaction displacement productivity reduction, the seepage experiment of the gas storage building process is designed, and the gas phase permeability change condition of each cycle period in the gas storage design service life is tested; the binomial productivity equation of the gas well is amended by seepage experiment results, and the productivity, deducting the seepage capability due to the gas-oil interaction displacement in the gas storage operation process, of the study object well is obtained. The method and the device have the advantage that the well productivity predicating accuracy of the oil cutting gas reservoir reconstruction gas storage can be improved.

Description

technical field [0001] The invention relates to the technical fields of underground natural gas storage, gas reservoir engineering and indoor experiments, and in particular to a method and device for predicting the productivity of a well in a gas-oil interaction area of ​​a gas storage. Background technique [0002] Gas storage is a powerful means to adjust the balance between supply and demand of natural gas. An important indicator to measure its adjustment ability is gas production capacity, which is realized by the production capacity of gas storage wells. Accurately predicting the production capacity of wells is a technical problem that plagues relevant researchers. [0003] At present, the impact of gas-oil alternation on productivity is mostly not considered when predicting the productivity of gas storage wells reconstructed from oil-invaded gas reservoirs. For example, in the article "Operational Parameter Design of Reconstruction of Underground Gas Storage in Xianggu...

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Problems solved by technology

[0003] At present, when predicting the productivity of gas storage wells reconstructed from oil-invaded gas reservoirs, most of them do not consider the impact of gas-oil alternation on productivity

For example, in the article "Operational Parameter Design of Reconstruction of Underground Gas Storage in Xiangguosi Carboniferous Gas Reservoir Reconstruction" in "Natural Gas Industry" in Volume 32, Issue 2, February 2012, it directly equates the well productivity in the gas reservoir development stage with the rebuilt gas storage After that, the productivity of wells in the future; in the article "Determination of Gas Well Productivity of Yong 21 Underground Gas Storage in Block Yong'an Oilfield" in "Xinjiang Petroleum Geology" in Volume 32, Issue 1, February 2011, the method described is only applicable to once in the reservoir The experience of oil flooding cannot accurately describe the physical process of multiple interactive displacements of gas and oil during the operation of the gas storage

[0004] Therefore, the current well productivity prediction methods for oil-invaded gas reservoirs to be converted into gas storages have limitations, especially the well productivity prediction methods for reservoirs located in gas-oil interaction areas are rarely reported, and relatively accurate calculation methods are required.

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