Method and device for determining gas suction capacity of gas injection well and gas supply capacity of gas recovery well in gas storage

Abstract

The invention discloses a gas storage gas injection well gas suction capacity and gas recovery well gas supply capacity determination method and device.The gas storage gas injection well gas suction capacity determination method comprises the steps that according to actual production data and theoretical production data of a gas storage gas injection well, yield instability analysis of the gas injection well is conducted, and seepage parameters of the gas injection well are determined; determining a laminar flow coefficient and a turbulent flow coefficient of the gas injection well according to the seepage parameters of the gas injection well; the laminar flow coefficient and the turbulence coefficient of the gas injection well are substituted into the binomial productivity equation of the gas well, and a productivity equation of the real-time gas suction capacity of the gas injection well is determined; according to the method, the yield instability analysis of the gas injection well is carried out based on the actual production data and the theoretical production data of the gas injection well of the gas storage, the seepage range and the change of the stratum permeability during gas injection of the gas storage are fully considered, and the real-time gas injection capacity of the gas injection well is determined according to the productivity equation of the real-time gas injection capacity of the gas injection well. The calculation precision of the real-time gas suction capacity of the gas injection well can be improved.

Description

technical field [0001] The invention relates to the technical fields of underground natural gas storage, gas injection and production engineering, and gas reservoir engineering, in particular to a method and device for determining the gas suction capacity of a gas injection well and the gas supply capacity of a gas production well in a gas storage. Background technique [0002] In order to supply gas to the market in winter, the gas storage needs to be filled with gas in summer to maintain a full state. The gas supply capacity, the suction capacity / gas supply capacity of the entire gas storage is provided by the gas storage wells one by one. The gas storage wells include gas injection vertical wells, gas injection horizontal wells, gas production vertical wells and gas production horizontal wells, among which, Horizontal wells are the type of wells with the largest injection and recovery volume, and vertical wells are the type of wells with the largest number. [0003] At p...

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Problems solved by technology

[0003] At present, there are limited means to obtain the gas absorption capacity of the gas injection well during the actual gas injection of the gas storage and the gas supply capacity of the gas production well during the actual gas production, and basically do not consider the formation seepage range and formation The most widely used method for the change of permeability is the well test. According to the well test, the gas absorption capacity equation of the gas injection well and the gas supply capacity equation of the gas production well can be obtained, but this method does not consider the relationship between the well test test and the actual injection The difference in formation seepage range during gas / gas production does not take into account the change in formation permeability of subsequent gas injection / gas production. According to the classic seepage law of gas in the formation, it is easy to know that the seepage range of the formation is related to the gas suction capacity / gas supply capacity of the gas well. There is a negative correlation. Existing well test tests have obtained a larger supply range than the actual formation, resulting in the calculated gas suction capacity of the gas injection well and the gas supply capacity of the gas production well. The calculation accuracy of the gas supply capacity is poor. In addition, the theoretical calculation method can also calculate the gas suction capacity of the gas injection well and the gas supply capacity of the gas production well, but because many parameters in the theoretical formula cannot be accurately obtained, such as formation range, thickness and permeability, etc. The key parameters can only be estimated by experience in practice, so the calculation accuracy is also poor

[0004] For the above problems, no effective solution has been proposed

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