Low-water-content oil-proof foaming agent

Abstract

The invention discloses a low-water-content oil-proof foaming agent. The foaming agent is composed of, by mass, 30-50% of modified sapindus mukorossi essence, 20-40% of fatty alcohol polyoxyethylene ether, 15-30% of polylauryl diethanolamine, and 5-15% of polydimethylsiloxane. The anti-mineralization capacity of the low-water-content oil-proof foaming agent reaches 200 g / L, the condensate oil resistance reaches 30%, the temperature resistance is up to 90 DEG C, the foam moisture content is 1.16%, when the content of oil condensates is 30%, the foaming capacity can reach 150 mm, the liquid carrying rate is 68%, the optimum use concentration is 0.3-0.5%, and the foam scrubbing success rate in a field test reaches 90% or above. The low-water-content oil-proof foaming agent has no toxins, is easy to degrade, does not cause pollution to the environment, can be compatible with methyl alcohol, corrosion inhibitor and other agents, does not chemically react with gas or liquid components, does not increase the toxicity of gas or combustion products, and does not corrode equipment or pipes.

Description

[0001] 【Technical field】 [0002] The invention relates to an oil-resisting foaming agent with low water content, which is a gas field foam drainage agent and belongs to the technical field of oil and gas fields. [0003] 【Background technique】 [0004] During the development of the gas field, the formation energy of the gas well itself gradually decreases. Due to the influence of formation water and condensed water in the natural gas, the self-spraying ability of the gas well is weakened, and the liquid-carrying energy of the gas well is getting worse and worse. When the gas phase cannot provide enough energy for continuous The leakage of wellbore fluid will often cause liquid accumulation in the wellbore of the gas well, affecting the normal production of the gas well. Foam drainage gas recovery technology is a production-aiding technology researched for the development of gas wells in water-producing gas reservoirs. It has the characteristics of less investment, low cost, an...

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Problems solved by technology

[0005] For gas wells with low pressure, small water volume, and condensate oil, ordinary foaming agents have a high water content, and the foam wall bears a large pulling force of droplets, which is easy to cause foam rupture. Continuously slipping droplets increase the load of the gas well and gradually slow down the gas flow rate. , making it difficult to produce continuously with liquid in the gas well; and the mass of the foam per unit volume is large, and the foam will increase the bottom hole back pressure with the increase of the lift height, and as the back pressure and the bottom hole pressure gradually approach, the foam lifting speed and The height is also weakening, coupled with the foam burst droplet slipping and eventually causing the wellbore to accumulate fluid and dead well

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