Abstract: Aiming at actual issues such as the increased horizontal wells needing to carry out foam drainage gas recovery, the unknown effect of horizontal well whipstocking section on foam carrier, the simulated evaluation study on the effect of foam carrier by different slopes of the horizontal well whipstocking section was carried out in this paper. The foam carrier amount under same vertical height, same pipe length and different amount of foaming agent at different slopes as 90°, 60°, 45° and 30° were evaluated and analyzed. The experimental results show that when the slope angle is less than 55°, it has bigger effect on foam carrier; when the slope angle is over 55°, it has smaller effect on foam carrier. The pipe length has a smaller effect on the foam carrier. By using foaming agent with better stability and increasing the dosage of it in the horizontal well, the impact of whipstocking section on the foam scrubbing effect could be overcome.