Underground plugging device for gas drilling

The utility model provides an underground plugging device for gas drilling, which comprises a body, and a first channel for fluid circulation is arranged in the body. And the packing piece is arranged on the outer wall of the body. Wherein the packing piece can abut against the well wall, and therefore communication between the underground spaces on the two sides of the packing piece is cut off. The downhole plugging device can effectively prevent wellhead gas and rock debris from returning in the gas drilling process, and the probability of sand setting blocking accidents is reduced. 本实用新型供了一种用于气体钻井的井下封堵器，包括：本体，所述本体内具有流体流通的第一通道。以及设置在所述本体外壁上的封隔件。其中，所述封隔件能够与井壁相抵接，从而切断封隔件两侧的井下空间之间的连通。本实用新型的井下封堵器能够有效防止气体钻井时井口气体和岩屑失返的情况发生，降低沉砂阻卡事故发生的概率。