A Method of Estimating Gas Well Production

Abstract

A method for estimating gas well production provided by the present invention includes: establishing a gas field "one-point method" productivity equation; calculating the average daily production of sample points in the gas field within the predetermined production history period, and the sample point is within the predetermined production history period The pressure drop rate of the sample point is within the first predetermined range; according to the daily production and bottom hole flow pressure of the sample point during the gas test, the absolute open flow of the sample point is calculated; the average daily production of the sample point and the absolute open flow of the sample point are calculated Regression analysis calculation, to obtain the first relationship between the average daily production of gas wells in the gas field and the absolute unobstructed flow rate during official production; according to the daily production and bottom hole flow pressure of the wells to be officially produced, calculate the absolute unobstructed flow of the wells to be officially produced Flow: According to the absolute unimpeded flow rate of the wells to be officially produced, the first average daily production of the wells to be officially produced when they are officially produced is calculated. The invention realizes that the daily production of the gas well can be estimated according to the actual production situation after fracturing of the tight sandstone gas reservoir.

Description

technical field [0001] The invention relates to the field of oil and gas exploitation, in particular to a method for estimating the output of a gas well. Background technique [0002] Tight sandstone gas reservoirs refer to unconventional gas reservoirs with low porosity, small pores, and poor permeability, which generally require fracturing to be put into production. This type of gas reservoir has the characteristics of poor reservoir physical properties and strong heterogeneity. Therefore, each well in the tight sandstone gas reservoir must be fractured before it can be put into normal production. After the well is put into production, the initial production is high, the stability is poor, and the production declines rapidly. , does not have the geological conditions for stable production. [0003] When exploiting a gas reservoir, it is first necessary to predict the gas well production of the gas reservoir. This is because the production of gas wells in gas reservoirs i...

AI Technical Summary

Problems solved by technology

For tight gas wells that cannot achieve stable production, the absolute open flow calculated by the "one-point method" can only represent the open flow at a certain moment after the fracturing of the gas well, which is obtained from an unstable point and has uncertainty; and in the past The conventional practice is to select 1 / 4 or 1 / 3 of the absolute open flow rate as the daily production, but the selected ratio of 1 / 4 or 1 / 3 is only an empirical estimate, whether it is in line with the actual production of tight sandstone gas reservoirs after fracturing There is no scientific basis, so there is no method for estimating the daily production of gas wells in tight sandstone gas reservoirs that can reflect the actual production of tight sandstone gas reservoirs after fracturing

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