A system and method for obtaining formation pressure of gas reservoirs

Abstract

The invention discloses a system for acquiring gas reservoir formation pressure and a method thereof, and belongs to the technical field of acquiring formation pressure in a gas field. In the method, the gas layer depth of a gas well is measured firstly, secondly, the well head pressure of the gas wall is measured, then the shaft pressure gradient is calculated according to the well head pressure, and finally the formation pressure of the gas well is calculated according to the gas layer depth, the well head pressure and the shaft pressure gradient. According to the system for acquiring the gas reservoir formation pressure and the method thereof, pressure data of a single well is calculated by a large amount of gas well data of production, so that abundant formation pressure data is acquired, the defects that the amount of actually obtained formation pressure data is small and the realization of the process is trivial are remedied, and the demand on the amount of formation pressure evaluating data of the whole gas field is satisfied. The contradiction between pressure measurement after gas well closure and the production of the gas well is solved.

Description

Technical field [0001] The invention belongs to the technical field of obtaining formation pressure in a gas field, and relates to a system and a method for obtaining formation pressure in a gas reservoir. Background technique [0002] At present, in the development of gas fields, the most reliable way to obtain the formation pressure of gas reservoirs is to shut-in pressure measurement for all gas reservoirs (such as Sichuan, Liaohe gas fields, etc.). This method is to lower the pressure gauge into the bottom of the well when the well is shut in. Directly obtain the formation pressure of the gas well. The shortcomings of this method of obtaining formation pressure of gas reservoirs are that it affects gas well production and increases costs. Therefore, the current formation pressure of gas reservoirs cannot be obtained on a large scale, especially for integrated gas fields. Impossible, even if the overall shut-in pressure measurement is carried out locally or in a small area, i...

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Problems solved by technology

The disadvantage of this method of obtaining formation pressure of gas reservoirs is that first, it affects the production of gas wells, and second, it increases costs, so the current formation pressure of gas reservoirs cannot be obtained on a large scale. Impossible, even if the overall well shut-in and pressure measurement work is carried out locally and in a small area, it will affect the normal production of gas wells and downstream gas supply

[0005] In the method γ g , T and Z are all unknown quantities, which are not easy to determine, and with the change of H P ws , γ g , T and Z will also change

Therefore, it is difficult to obtain and determine some relevant parameters in the theoretical formula, which increases the complexity of calculation and limits the operability

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