Sustained-release foaming agent

Abstract

The invention relates to a sustained-release foaming agent which is composed of the following components, by weight: 20% of Chinese soapberry fruit essence, 13.3% of fatty alcohol-polyoxyethylene ether AEO18, 6.7% of polylauroyl diethanolamide, 20% of polyvinyl alcohol PAV, and 40% of acrylic resin. The sustained-release foaming agent provided by the invention has high foaming capacity when contacting water, and the foam has good stability. Liquid carrying and anti-mineralization capacities of foam are high. The foam is suitable for use in condensate-oil-containing natural gas wells with high mineralization and large water yield. The foaming capacity can reach 175mm, the anti-mineralization capacity reaches 250g / L, the condensate-oil-resistant capacity reaches 30%, the temperature resistance reaches 90 DEG C, and a dissolution time exceeds 72h. The agent has a long effective period. According to field tests, the foam scrubbing success rate is higher than 90%. The product is non-toxic and is easy to degrade. The product does not pollute the environment, does not chemically react with gas and liquid components, and does not corrode equipment and pipes.

Description

[0001] Field [0002] The invention relates to a solid slow-release foaming agent, which is a gas field foam drainage agent and belongs to the technical field of oil and gas field chemicals. Background technique [0003] In the middle and later stages of natural gas well production, due to the decline in the bottom energy of the gas well itself, formation water will gradually accumulate at the bottom of the well or near the well due to the slippage effect during the gas flow lift process, and the liquid saturation will increase. Soaking”, “water lock”, “expansion of water-sensitive clay minerals” and other reasons, the similar gas phase permeability is greatly damaged, which may cause water to seal the gas, reduce the productivity and ultimate recovery of the gas well, and cause the gas production of the gas well to decrease or drown in water. [0004] At present, the commonly used drainage gas recovery methods include pipe string drainage, gas lift drainage, foam drainage, u...

AI Technical Summary

Problems solved by technology

[0003] In the middle and late stages of natural gas well production, due to the decline in the bottom energy of the gas well itself, formation water will gradually accumulate at the bottom of the well or near the well due to the slippage effect during the gas flow lift process, and the liquid saturation will increase. immersion, "water lock", "expansion of water-sensitive clay minerals" and other reasons, the gas phase permeability will be greatly damaged, which may cause water to seal the gas, reduce the productivity and ultimate recovery of the gas well, and cause the gas production of the gas well to decrease or drown

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