Drilling wellhead suction auxiliary drainage manifold system

The invention provides a drilling wellhead suction auxiliary drainage manifold system, comprising a plurality of hard pipeline bodies, a drilling sand drainage pipeline axial oblique injection suctionauxiliary drainage mechanism capable of realizing negative pressure suction at the drilling wellhead and / or pipeline turning position, and a telescopic pipeline length adjustment mechanism for drilling sand drainage pipelines capable of telescopic connection. According to the suction auxiliary drainage manifold system, the safety problem of gas drilling open well operation under the condition that a small amount of natural gas is produced from the formation can be solved, safety of the gas drilling open well operation in the gas bearing interval is greatly improved, the suction auxiliary drainage manifold system can further be applied to conventional positive circulation or reverse circulation gas drilling, so as to effectively reduce the local loss at the right angle turning and make a surface sand discharge process more smooth; and the length of the sand drainage pipelines can be easily, conveniently and randomly adjusted, the sand drainage pipelines are communicated quickly in a butt-joint mode to avoid repeated lifting and prying, workload and work intensity of staff are reduced, a installation period is shortened, and the cost of the staff and the use cost of a crane are saved.