A gas well drainage compound agent

Abstract

The invention relates to a gas well drainage compound agent. The gas well drainage compound agent comprises the following components, and the following components are calculated by mass percentage: 30% of ethylene glycol, 3% of dispersant sodium sulfonate, 5% of triethylene glycol, Anti-swelling agent quaternary ammonium salt 5%, corrosion inhibitor imidazoline 6%, methanol 7%, emulsifier monoglyceride 2%, and the balance is water. The gas well drainage agent of the present application is regularly added in a certain amount to promote the multiple contact, dissolution and miscibility of natural gas and bottom fluid, thereby improving the density and fluidity of the wellbore fluid, and achieving the purpose of drainage and gas enhancement.

Description

Technical field: [0001] The invention belongs to the technical field of drainage and gas recovery, and in particular relates to a composite agent for aiding drainage of gas wells. Background technique: [0002] Conventional foam drainage gas recovery mainly uses surfactants to foam when they meet water, thereby reducing the wellbore fluid density to achieve drainage gas recovery, but there are the following problems in the actual operation process: 1. When there is serious fluid accumulation in the gas well or the concentration of foaming agent is added When it is unreasonable, the foaming agent added from the oil casing annulus cannot form foam with the bottomhole fluid in time and is taken out of the wellbore. The foaming agent that stays in the wellbore for a long time will deteriorate and block the formation or wellbore. 2. After the foaming agent is added to the gas well, a large amount of stable foam will be formed on the ground. It is necessary to add a defoamer to de...

AI Technical Summary

Problems solved by technology

[0002] Conventional foam drainage gas recovery mainly uses surfactants to foam when they meet water, thereby reducing the wellbore fluid density to achieve drainage gas recovery, but there are the following problems in the actual operation process: 1. When there is serious fluid accumulation in the gas well or the concentration of foaming agent is added When it is unreasonable, the foaming agent added from the oil casing annulus cannot form foam with the bottom hole fluid in time and is taken out of the wellbore. The foaming agent that stays in the wellbore for a long time will deteriorate and block the formation or wellbore

2. After the foaming agent is added to the gas well, a large amount of stable foam will be formed on the ground. It is necessary to add a defoamer to defoam in time. Once it is not timely, it will cause triethylene glycol to cause pan tower

3. Due to the low winter temperature in the north, after adding the foam drainage agent in winter, the gas well is very prone to freezing and blocking of the wellbore and the surface pipeline, which affects the operating time of the gas well

4. When there is a lot of foam in the ground gas production pipeline, the flow resistance increases, and the gas collection station is medium and high pressure, so it is very easy to have no transient phenomenon in the station

5. After adding the foam defoamer, it is difficult to determine when the foam will start and stop, so it is necessary to add the defoamer in advance or later, which increases the cost

6. If the defoaming is not complete, after a large amount of foam enters the pressure vessel, due to the inconsistent pressure inside and outside the foam, once the foam is broken, it will produce "bursting force", which poses a safety hazard

7. Some well stations have no defoaming process, but the gas wells have serious liquid accumulation, and drainage is urgently needed

10. Once the foam enters the ground meter, it will easily lead to inaccurate data and damage to the meter