Method for determining reasonable gas production speed of gas reservoir with water based on water invasion speed

Abstract

The invention discloses a method for determining reasonable gas production speed of a gas reservoir with water based on water invasion speed. The method comprises the following steps of 1, calculatinga water invasion index according to the current apparent formation pressure, the original apparent formation pressure, the current accumulated gas production and the geological reserves of the gas reservoir with water; 2, calculating the water invasion speed, wherein the water purification invasion amount of the gas reservoir with water in the exploitation period is calculated according to the production data, and the water invasion speed is calculated according to the water purification invasion amount; 3, obtaining the critical gas production rate of rapid water breakthrough based on the calculation of water invasion speed and water invasion index; and 4, determining the reasonable gas production speed, and determining the reasonable gas production speed of the water-bearing gas reservoir by combining the number of production wells and the productivity of the gas wells. According to the method determining reasonable gas production speed of the gas reservoir with water based on waterinvasion speed, the critical value of the gas production speed corresponding to the rapid water breakthrough of the gas reservoir can be determined, and finally the reasonable gas production speed smaller than the critical value is determined by combining the number of the production wells, the gas well productivity and the like, so that the water invasion of the gas reservoir with water is stable and controllable, and the maximum economic benefit is achieved.

Description

technical field [0001] The invention belongs to the technical field of oil and gas exploration and development, and in particular relates to a method for determining a reasonable gas production rate of a water gas reservoir based on a water invasion rate. Background technique [0002] During the development of water-bearing gas reservoirs, edge and bottom water gradually invades to the bottom of the well with the formation of the bottom well pressure drop funnel, thereby reducing the gas saturation and gas phase permeability of the gas layer. When the water cone enters the wellbore, it will increase the Energy consumption reduces gas production and gas liquid-carrying capacity, eventually leading to water flooding of gas wells and shutting down production, affecting the ultimate recovery of gas reservoirs. Reasonable gas production rate is an effective means to control formation water intrusion. It can slow down the advancing speed of water body and reduce the damage of wate...

AI Technical Summary

Problems solved by technology

As we all know, the volume coefficient of water intrusion is a static characteristic parameter of formation water, and cannot characterize the dynamic characteristics of formation water propulsion; therefore, it is more reasonable to determine the reasonable gas production rate by studying the dynamic parameters of water intrusion—the relationship between water intrusion speed and gas production rate. However, the existing methods lack research in this area and have technical deficiencies.

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