THpetro XJ350 series workover rig is the most famous product in international workover rig market. THpetro has developed the XJ350 series based on different chassis, engines and configurations to achieve various types of operation including well workover, well service and well drilling. In Oklahoma, Texas and Kansas, hundreds of XJ350s with American flag colored derricks are standing as the signature of TongHua Petro in United States.