Method for calculating productivity of high-pressure carbonate rock water-bearing gas reservoir gas well

Abstract

The invention provides a method for calculating productivity of a high-pressure carbonate rock water-bearing gas reservoir gas well. The method comprises the following steps of: 1, establishing a productivity model of the high-pressure carbonate rock water-bearing gas reservoir gas well; 2, solving the productivity model, and solving expressions of a Darcy coefficient and a non-Darcy coefficient;3, determining a stress sensitivity coefficient B according to rock core permeability stress sensitivity experimental data regression; 4, calculating current water saturation according to logging original saturation and production data; 5, regressing a gas-water permeability curve, determining a gas-water permeability curve equation, and determining relative permeability Krg of gas and relative permeability Krw of water according to relative permeability curve equations of different reservoirs; and 6, calculating a Darcy coefficient A and a Darcy coefficient B, and determining a productivity equation expression. The method has the beneficial effects that by adopting the technical scheme provided by the invention, the productivity of gas wells of different medium reservoir gas wells of thehigh-pressure water-bearing gas reservoir under stress sensitivity and different water production modes can be accurately calculated.

Description

technical field [0001] The invention relates to the technical field of oil and gas development, in particular to a method for calculating the productivity of gas wells in high-pressure carbonate rock water gas reservoirs. Background technique [0002] As my country's deep marine carbonate gas reservoirs continue to increase exploration and development efforts, during the development of such gas reservoirs, due to geological characteristics such as abnormally high pressure in the formation and widespread edge and bottom water, the productivity evaluation of this type of gas reservoirs It brings challenges. Conventional gas well productivity evaluation methods such as binomial and exponential are all established under normal pressure system, no stress sensitive conditions, no edge bottom water and no movable water in pores in the formation. , no matter from the theoretical principle or the field implementation evaluation effect, it is no longer applicable to the evaluation of th...

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Problems solved by technology

[0002] As my country's deep marine carbonate gas reservoirs continue to increase exploration and development efforts, during the development of such gas reservoirs, due to geological characteristics such as abnormally high pressure in the formation and widespread edge and bottom water, the productivity evaluation of this type of gas reservoirs It brings challenges. Conventional gas well productivity evaluation methods such as binomial and exponential are all established under normal pressure system, no stress sensitive conditions, no edge bottom water and no movable water in pores in the formation. , it is no longer applicable to the evaluation of the productivity of gas wells in high-pressure water-bearing gas reservoirs, no matter from the theoretical principles or the evaluation results of field implementation.

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