Fast calculation method for reasonable productivity of shallow lithologic gas reservoirs

Abstract

The invention provides a rapid calculation method for the reasonable productivity of a shallow lithologic gas reservoir. The rapid calculation method for the reasonable productivity of the shallow lithologic gas reservoir comprises the following steps of 1 collecting gas reservoir parameters and determining single well production parameters; 2 converting the productivity according to the actual productivity of the gas test well; 3 calculating the productivity ratio and analyzing an abnormal point; 4 determining the productivity ratio of the stable period, and further obtaining the reasonable productivity of the gas reservoir. The fast calculation method for the reasonable productivity of the shallow lithologic gas reservoirs can effectively reduce the calculation difficulty, avoid the calculation deviation caused by unqualified test data, and derive a method which is not limited by surface conditions, and can replace the original method to a certain extent, and can also reduce resourceconsumption.

Description

technical field [0001] The invention relates to the technical field of oil field development, in particular to a fast calculation method for reasonable production capacity of shallow lithology gas reservoirs. Background technique [0002] Shallow gas reservoirs in the Shengli oil and gas region are shallowly buried, loosely cemented and often contain edge and bottom water. In the production process, if the production ratio is too large, it will easily cause formation water and sand production; if the production ratio is too small, it will restrict the productivity of the gas well, resulting in a decrease in the liquid carrying capacity, resulting in fluid accumulation in the wellbore. Therefore, choosing a reasonable production capacity of gas wells is an important content of gas reservoir development, which directly affects the final production effect of gas reservoirs. [0003] Before new wells or new layers are officially put into development, the open flow rate of the g...

AI Technical Summary

Problems solved by technology

Due to the large amount of measured data, it takes a long time and high investment, and there are many geological and ground influences

It is required that the pressure drop of the system well test measuring point be controlled within 20% of the total pressure drop of the gas well, and the pressure drop of each measuring point should be basically the same. To meet this requirement, it will inevitably cause more air release, resulting in waste of resources and environmental pollution

In addition, the constraints of ground conditions may also prevent some gas wells from carrying out this work

The existing well testing methods and related calculation formulas involve many parameters and the calculation process is complicated. When the number of production wells is large, it is difficult to obtain reliable calculation results in a short period of time.

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