Method for calculating real pressure and reserves of low-permeability gas reservoir by using production data

Abstract

The invention discloses a method for calculating real pressure and reserves of a low-permeability gas reservoir by using production data. The method comprises the following steps: S1, exporting the production data of a certain well in a gas field development information network; S2, reading the casing pressure, the daily gas production rate, the accumulated gas production rate and the accumulatedwater production rate in the production data, and calculating the flowing bottomhole pressure Pwf through the casing pressure; S3, assuming an original pressure Pi of a gas reservoir, and solving a yield equation; S4, trying to cut the original pressure Pi, and observing the linear shape until the linear correlation is satisfactory; and S5, calculating single-well control reserves G. According tothe method, the controlled reserves of the low-permeability gas reservoir are solved by using a material balance method, and a material balance equation can form linear formation pressure, namely thesolved pressure, by continuously trying to cut off the pressure, and meanwhile, the controlled reserves of a single well are also solved.

Description

technical field [0001] The invention relates to a method for calculating reserves of gas production wells, more precisely, a method for calculating real pressure and reserves of low-permeability gas reservoirs by using production data. Background technique [0002] The original pressure of the gas reservoir is not only used to calculate the controlled reserves of a single well in a low-permeability gas reservoir, but also used to calculate the open flow of gas production wells and predict the pressure of gas reservoirs in the future. For the pressure measurement of low-permeability gas reservoirs, there are currently the following three problems: ① It takes a long time to shut down the well and restore it, which affects production; The local stress concentration at the holes and fractures causes the formation pressure to be relatively high. Even if the well is shut down for testing, the pressure cannot represent the true pressure of the formation. ③In addition, due to the l...

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Problems solved by technology

For the pressure measurement of low-permeability gas reservoirs, there are currently the following three problems: ① It takes a long time to shut down the well and restore it, which affects production; The local stress concentration at the holes and fractures causes the formation pressure to be too high. Even if the well is shut down for testing, the pressure cannot represent the true pressure of the formation

③In addition, due to the large well depth and well deviation, the penetration depth of the pressure gauge is limited, and the formation pressure cannot be accurately obtained when the wellbore is deep in liquid.

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