Development and application of the special chassis for mid-deep well rig

The chassis of the self-propelled rig is the base for the installation of the power unit,the trans- mission unit,the drawworks and the mast.It is also the unique carrier for the transportation of the rig.Its capability and reliability determines the performance and application of the whole rig set.By researching into the carrier body,unit rated power,rig driving system,appending type,carrier bridge,tire,steering type,flexibility,etc.the author developed a new kind of chassis for the mid-deep self-propelled rig.