A multi-water layer four-dispersion foaming agent for natural gas horizontal wells

Abstract

The invention relates to a four-scattering type foaming agent used in multi-water layer of natural gas horizontal well. It can push the foaming agent to the bottom of the wellbore of the horizontal well, and react with the fluid at different depths at the bottom of the well, with a large sweeping range and strong foaming ability. The technical scheme is: the solid foaming agent is made into a spherical shell of the foaming agent provided with a water channel and an inner foaming agent ball with different densities. The foam release agent spherical shell is filled with different densities of inner foam release agent balls and fast foaming particles. First put the multi-water layer scattered type foam drainage agent into the gas well, the water will contact the fast foaming particles through the set water channel to generate a large number of bubbles, push the foam drainage agent to the bottom of the wellbore, and when the spherical shell of the foam drainage agent gradually dissolves , a large amount of gas generated inside pushes the internal foam discharge agent balls to the surroundings, and finally the internal foam discharge agent balls with different densities fully contact with the fluid at different depths to achieve the best effect of foam drainage and gas recovery. The invention improves the function of the foaming agent and the drainage and gas recovery efficiency, saves time and effort, is low in cost, and is friendly to the environment.

Description

technical field [0001] The invention relates to a multi-water-layer four-scattering type foam drainage agent for natural gas horizontal wells used in the foam drainage and gas recovery process of gas reservoirs, and belongs to the field of gas well drainage and gas recovery. Background technique [0002] As the development of the gas field enters the middle and later stages, the flow rate of natural gas in the gas layer will gradually decrease, more and more water will be produced, and the gas-water ratio will become smaller and smaller. When the gas in the gas well cannot effectively carry out liquid, the wellbore will produce accumulation Liquid, resulting in bottom hole pressure, seriously affecting the production of gas wells. Through the foam drainage gas production process, that is, inject foam drainage agent into the gas well to reduce the density of the wellbore fluid accumulation, reduce the critical liquid carrying capacity of the gas well, and bring the fluid accu...

AI Technical Summary

Problems solved by technology

[0005] According to literature research, there is no report on the idea, product, process design method and theoretical basis research of a foam drainage gas recovery method for natural gas horizontal gas wells with multiple water layers and a large sweeping range in terms of foam drainage gas recovery technology.

Images