Abstract: CZP, which is made from agricultrual by-products, is a foaming agent for removing liquid from gas well.By laboratory evaluation and field experiment, it is shown that CZP has a powerful foaming effect, possesses good foam stability, carries large quantities of liquid and is widely adaptable under conditions of gas well .It may be used to remove liquid from gas wells which contain 70-90%gas condensates, or high content of sulfides, and used in the sulfur-bearing gas wells more than 3000 m deep as well as in general gas wells.It is a cheap excellent foaming agent for gas wells.

Key words: Foaming agent, Removing liquid from well, Surfactant, Field experiment, CZF