Salt-resistant and high-temperature-resistant foam discharge agent and method for preparing same

Abstract

The invention relates to a salt-resistant and high-temperature-resistant foam discharge agent and a method for preparing the same, and belongs to the technical field of oil and gas field development.The salt-resistant and high-temperature-resistant foam discharge agent comprises, by weight, 0.2-0.5% of anionic-nonionic surfactant composite systems, 0.02-0.08% of microbial fermentation liquor andthe balance water. The microbial fermentation liquor is glycolipid producing biological surfactant or lipopeptide producing biological surfactant microbial strain fermentation liquor. The salt-resistant and high-temperature-resistant foam discharge agent and the method have the advantages that the salt-resistant and high-temperature-resistant foam discharge agent has salt-resistant and high-temperature-resistant foaming, foam stabilizing and liquid carrying ability and is excellent in condensate oil resistance and methanol tolerance, and accordingly the salt-resistant and high-temperature-resistant foam discharge agent and the method are favorable for environmental protection and sustainable development of oil and gas fields.

Description

technical field [0001] The invention relates to a salt-resistant and high-temperature anti-foaming agent and a preparation method thereof, belonging to the technical field of oil and gas field development. Background technique [0002] A large number of liquid-producing gas wells in my country have the problems of high liquid-gas ratio and difficult liquid drainage. In order to prevent gas wells from forming hydrates, downhole throttling technology is often used, which reduces production pressure and further increases the difficulty of liquid drainage. [0003] The foam drainage process can produce various physical-chemical effects such as foam, dispersion, drag reduction, and washing during the vertical flow of gas-liquid two-phase mixing, reduce the "slip loss" in the wellbore, and improve the vertical liquid lifting capacity of the gas flow. To achieve the purpose of improving the efficiency of drainage and gas recovery; and in the liquid drainage process technology serie...

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Problems solved by technology

[0007] The Chinese invention patent with the authorized notification number CN 103555309B discloses a water lock damage treatment agent based on biosurfactant. The water lock damage treatment agent includes the following components in mass percentage: microbial fermentation broth 30-70%, 1-5% of non-ionic surfactant, 0.5-1% of fluorocarbon surfactant, 5-8% of cationic surfactant, and the rest is distilled water, wherein the microbial fermentation liquid is the fermentation liquid of Pseudomonas aeruginosa; The water lock damage treatment agent disclosed in the patent can effectively prevent and eliminate water lock damage, but the amount of microbial fermentation liquid and surfactant is large, the cost is high, and it is easy to cause a certain impact on the environment

[0008] The invention patent with authorized notification number CN 103614131B discloses a biochemical anti-salt and high temperature oil displacement viscosity reducer and its preparation method. The oil displacement viscosity reducer disclosed in this patent includes the following components in mass percentage: microbial fermentation broth 30-85%, 0.5-5% of anionic surfactant, 0.5-10% of non-ionic surfactant, and the balance is distilled water; the microbial fermentation liquid is the fermentation liquid of Pseudomonas aeruginosa or Bacillus subtilis; The oil displacement viscosity reducer disclosed in this patent has high temperature resistance and salinity resistance, but the amount of surfactant and microbial fermentation liquid is too large, the cost is high, and it is harmful to the environment

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