A Calculation Method for Productivity of Gas Wells in High-Pressure Carbonate Gas Reservoirs with Water

Abstract

The invention provides a method for calculating the productivity of a gas well in a high-pressure carbonate rock gas reservoir with water, which includes the following steps: the first step: establishing a gas well productivity model in a high-pressure carbonate rock gas reservoir with water; the second step: solving the productivity model, calculating The expression of Darcy coefficient and non-Darcy coefficient; the third step: determine the stress sensitivity coefficient b according to the regression test data of core permeability stress sensitivity; the fourth step: calculate the current water saturation according to the original logging saturation and production data The fifth step: regress the gas-water phase permeability curve, determine the gas-water phase permeability curve equation, and determine the relative permeability K of gas according to the relative permeability curve equation of different reservoirs rg and the relative permeability of water K rw ; Step 6: Calculate Darcy coefficient A and Darcy coefficient B, and determine the expression of the production capacity equation. The beneficial effect of the present invention is that the technical solution provided by the present invention can accurately calculate the productivity of gas wells in different media reservoirs of high-pressure water-containing gas reservoirs under stress sensitivity and different water production modes.

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 a gas well in a high-pressure carbonate rock water-bearing gas reservoir. Background technique [0002] With the continuous increase in exploration and development of deep marine carbonate gas reservoirs in my country, during the development process of such gas reservoirs, due to the abnormally high formation pressure and the ubiquitous geological features such as edge and bottom water, the productivity evaluation of such gas reservoirs This brings challenges. Conventional gas well productivity evaluation methods such as binomial and exponential are established under normal pressure system, no stress-sensitive conditions, no edge bottom water, and no intra-layer pore movable water conditions. , it is no longer applicable to the evaluation of the productivity of gas wells in high-pressure water-bearing gas reservoirs, whet...

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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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