Methanol, condensate oil and high mineralized water resistant compound betaine foam scrubbing agent special for oil and gas fields and preparation method thereof

Abstract

The invention discloses a preparation method of a methanol, condensate oil and high mineralized water resistant compound betaine foam scrubbing agent special for oil and gas fields. The production rawmaterials comprise the following components by mass: 10-30 parts of cocamidopropyl amine oxide, 30-50 parts of cocamidopropyl betaine, 30-50 parts of dodecyl dimethyl betaine, 1-3 parts of lauryl alcohol ether sodium sulfate, and 2-5 parts of alpha-olefin sodium sulfonate. The compound betaine foam scrubbing agent has the advantages that: the high methanol resistance, the high condensate oil resistance and the high mineralized water foaming resistance of the betaine or ammonium oxide foam scrubbing agent are obviously improved; the foaming agent contains 30% of petroleum ether and purified water, the foaming power can reach 600mm or above within 0 minute, the foam stability reaches 500mm or above within 5 minutes, and the liquid carrying capacity is 88% or above; in the presence of 20% ofmethanol and purified water, the foaming power can reach 250mm or above within 0 minute, the foam stability reaches 245mm or above within 5 minutes, and the liquid carrying capacity is 79% or above;for 250g/L mineralized water, the foaming power can reach 166mm or above within 0 minute, the foam stability reaches 163mm or above within 5 minutes, and the liquid carrying capacity is 78% or above.

Description

technical field [0001] The invention relates to the technical field of gas well development, in particular to a special foaming agent for oil and gas fields. Background technique [0002] Many oil and gas fields have entered the middle and later stages of development. Due to the continuous decline of formation pressure, the daily gas production has declined. When the daily gas production is less than the critical liquid gas carrying capacity of the well, the wellbore of the well will have liquid accumulation. If the liquid is not discharged from the well in time, it will be destroyed. This can lead to excessive fluid accumulation in the wellbore. For these water-producing gas fields, the production of formation water will affect the production of natural gas to varying degrees. The hazards are as follows: firstly, the wellbore accumulates liquid, the back pressure increases, the wellhead pressure drops, and the production capacity of the gas well is seriously affected; Exp...

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Problems solved by technology

[0006] However, with the in-depth development of natural gas wells, the production and transportation of gas wells are currently facing the problems of drainage and gas recovery such as high methanol content, high condensate oil content, and high mineralized water. Betaine surfactants or amine oxide surfactants or by The simple mixture of the two foam drainage agents has gradually been difficult to meet the needs of the drainage and gas recovery process. Therefore, a new type of anti-high methanol, high condensate oil, and high mineralization water foam drainage agent is urgently needed.

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