| 摘要 |
The present invention relates to the use of a zwitterionic surfactant in combination with an anionic surfactant, selected from the group consisting of a sulphonate, a sulphate, an ether sulphate, an ether carboxylate, or a mixture thereof, as a drag-reducing agent in a water-based liquid suitable for heat distribution. Besides the drag-reducing agent the water-based liquid contains 5-35% by weight of the ethylene glycol compound of the formula HO(C2H4O)nH, where n is a number from 1 to 4 and 0-4% by weight of an electrolyte.
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