Method and device for predicting productivity of gas storage gas water interaction area

Abstract

The invention discloses a method and a device for predicting productivity of a gas storage gas water interaction area. The method comprises the following steps of determining the function relation between gas reservoir pure water influx and pressure, and according to the function relation, determining a study target well positioned in the gas water interaction area in a gas storage operation rebuilding process; processing gas reservoir development data or well test data of the study target well to obtain a gas well binomial deliverability equation, and determining the productivity-reducing influence factors of gas water interaction displacement; according to the productivity-reducing influence factors of gas water interaction displacement, designing a seepage test in a gas reservoir building process, and testing the change state of the gas phase permeability in each cycle of the designed service life of a gas reservoir; correcting the gas well binomial deliverability equation by the seepage test result to obtain the productivity of the study target well from which the seepage ability lost by gas water interaction displacement in a gas reservoir operation process is deducted. According to the method and the device provided by the invention, the accuracy of well productivity prediction of a water logging gas reservoir rebuilt gas reservoir can be improved.

Description

technical field [0001] The invention relates to the technical fields of natural gas underground 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-water 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, when predicting the productivity of gas storage wells reconstructed from water-flooded gas reservoirs, the influence of gas-water alternation on productivity is mostly not considered. For example, in the article "Operational Parameter Design of Reconstruction of Underground Gas Storage ...

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Problems solved by technology

[0003] At present, when predicting the productivity of gas storage wells reconstructed from water-flooded gas reservoirs, most of them do not consider the impact of gas-water displacement 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 water intrusion cannot accurately describe the physical process of multiple interactive displacements of gas and water during the operation of the gas storage

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

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