Abstract: Aiming at the application restriction of liquid defoaming agent, XXP-1 solid defoaming agent was introduced and field tests were conducted in X5, XC6 and XYHF-2 gas wells of the western Sichuan gas field. The results indicated that XXP-1 solid defoamer has good capacity of breaking bubbles and inhibiting foam generation, the defoaming time of XXP-1 solid defoaming agent was less than 10 s and the inhibiting time was more than 6 min. The height of foam in sewage tank substantially reduced, monthly sewage pull capacity of upstream well station was greatly increased, and the gas outlet pressure dropped and approached to the pressure of pipe network after injecting XXP-1 solid defoamer. XXP-1 solid defoaming agent could efficiently eliminate the bubble and improve the gas-liquid separation efficiency.