... It has changed tradition-servicing process, make the workover rig with snubbing servicing wellhead device unitization, so the ... the pollution of layer and surface. Chassis type Self-propelled Engine typeISDLe375 30Dongfeng CUMMINS Max. Hook loadN900kN Derrick ... include Workover rig, drilling rig, live well service rig, No Guyline well service rig, water well drilling rig, core drilling rig, sand ...