Condensate oil foam discharging agent applied to natural gas extraction

Abstract

The invention discloses a condensate oil foam discharging agent applied to natural gas extraction. The condensate oil foam discharging agent is used for improving the extraction efficiency of natural gas rich in condensate oil. The condensate oil foam discharging agent comprises the following components in percentage by weight: 15 to 35 percent of anionic surfactant, 20 to 30 percent of amphoteric surfactant, 2 to 5 percent of fluorocarbon surfactant, 0.2 to 0.3 percent of foam stabilizer and the balance of water. A production process is simple, the condensate oil foam discharging agent is convenient to use, and can be used immediately after being added, the shelf life of the condensate oil foam discharging agent is as long as more than 6 months, and the market price of the condensate oil foam discharging agent is only 1 / 3 of that of a like imported product. The condensate oil foam discharging agent is powerful and special for resistance to condensate oil, and has a liquid carrying rate of over 90 percent, higher resistance to high salinity and higher high-temperature resistant capability. The product is proven by trial in the China national offshore oil corporation and the Changqing oilfield in China to have stable performance, and has broad application prospect, and the long-standing production interruption problems of well killing, dead well and the like caused by the accumulation of the condensate oil in the natural gas extraction can be solved.

Description

technical field [0001] The invention relates to the technical field of foam stabilizers, in particular to a condensate oil foaming agent suitable for natural gas exploitation. Background technique [0002] At present, the foam drainage gas recovery process has the advantages of less investment, low cost, quick effect, easy implementation and no influence on the normal production of gas wells, so it is widely used. In 1980, the Sichuan Gas Field conducted the first water-bearing gas well foam drainage gas recovery test, and the economic and social benefits were very significant. [0003] In the later stage of development of condensate gas wells, due to the large formation pressure drop and large ground exposure pressure difference, the fluid accumulation in the wellbore seriously affects the productivity and leads to high abandonment pressure and low ultimate recovery rate. Liquid drainage and gas recovery are necessary means for later development. Therefore, it is of great ...

AI Technical Summary

Problems solved by technology

There are more than ten kinds of foaming agents at home and abroad, which are suitable for different liquid-loaded gas reservoirs, but they are generally suitable for formations below 80°C and gas wells with low condensate oil content. As the oil content increases, the foaming ability and stability of the foaming agent will be greatly reduced, especially in high-temperature formations above 100°C and gas wells with condensate oil content greater than 20%, the foam produced by many foaming agents will be between 1 and 20%. Disappear within 2 minutes, even no foam

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