Because there are many throttles and other local resistance segment, so this paper have research the pressure drop of the abrupt contractions/abrupt expansion/ elbow/ valve in detail.

• 由于井口到集气站的地面管汇涉及诸多节流管件，因此文中详细研究了采气管线突扩接头、突缩接头、弯头、阀门等管件的局部阻力损失所造成的压降。