Superficial Analysis of Structure and Development Trend of Mast and Substructure of Middle and Deep Depth Land

The article mainly introduces the structure models that are generally used among current(4 000~)7 000 m land rig.This article points out that the developing trend of the middle and deep depth land electric drilling rig mast and substructure is of hydraulic cylinder raising;it is also pointed out that in order to lighten the weight,improve the mobility,reduce the installation period and labor force,the modularized design,mast and top drive integral design and advanced rig mobile technology should be implemented.At the same time,the author has given comments on developing the new generation of hydraulic swing-up mast and substructure.