On Aug 25, the wellhead gas screw compression set powered by KVT-E70SI gas engine had been running 72 hours continuously at the oilfield jobsite in Xinjiang. The compression set performance met the design requirements. Now, it operates normally at the jobsite. The prime mover, KVT-E70SI engine, is fueled by wellhead gas directly. The engine runs smoothly with normal exhaust gas temperature and other indications. The production for the compression set was 750-1000 NM³/H when the inlet gas pressure was 0.20-0.27MPA during the testing period.