Discrimination method and device for dispersion edge-bottom water type gas reservoir water invasion stage

Abstract

The invention provides a discrimination method and device for a dispersion edge-bottom water type gas reservoir water invasion stage. The discrimination method comprises the following steps that 1, according to dynamic and static data, qualitative analysis is performed on the dispersion edge-bottom water type gas reservoir; 2, by analyzing the relation between the daily water yield and the daily water-gas ratio of a production gas well, the relation between the accumulated water yield of the accumulated gas yield and the relation between the accumulated water-gas ratio and the accumulated produced water, on the basis of the qualitative analysis, and the quantitative recognition standard of each water invasion type is built; 3, according to the quantitative recognition standard of each water invasion type, the single well and development unit water invasion degree are discriminated respectively, and therefore the dispersion edge-bottom water type gas reservoir water invasion stage is discriminated. According to the discrimination method, the water invasion degree is effectively judged by means of the dynamic production data, operation is easy, the basis is sufficient, changes of thewater invasion strength can be dynamically shown, and therefore the efficient gas pool development and water treatment countermeasure formulation can be effectively guided.

Description

technical field [0001] The invention belongs to the technical field of oilfield development, and in particular relates to a method and a device for discriminating the water invasion stage of a dispersed edge-bottom water type gas reservoir. Background technique [0002] For the development of gas reservoirs with strong side and bottom water energy, the most worrying issue is gas well water breakthrough, which will cause troubles for surface engineering treatment, and will also greatly reduce gas well productivity and gas reservoir recovery. Whether the water invasion stage can be accurately predicted in the process of gas reservoir development will play an important guiding role in guiding the rational and efficient development of water-bearing gas reservoirs. [0003] At present, the identification methods of water intrusion mainly include produced water analysis, pressure drop curve identification, well test monitoring and simulation calculation, etc. Early water influx in...

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Problems solved by technology

However, these methods are either based on physical simulations to study the mechanism of water intrusion, or qualitative and semi-quantitative identification, or quantitative, but only rely on the mathematical expression basis of the production water-air ratio and the cumulative time of water discharge, the judgment is relatively simple, and the results are not enough Sufficient and unable to dynamically display the change of water invasion intensity, especially the judgment of water invasion degree of dispersed edge and bottom water type gas reservoirs

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