To verify the performance of the new natural gas engine and provide the basis for its upgrading and modification, the field test of it was conducted. The test result shows that compared with full diesel engine drive drilling, completion of drilling task in Well Wei 349 - 10 can reduce carbon emission by 36. 05% and save fuel costs by 21% after parallel mixed use of natural gas engine and diesel engine. Completion of drilling task in Well Wei 349 Ping 1 can reduce carbon emission by 20. 19%. The failures mainly include intercooler blowup and cylinder failure. The engine post-combustion, valve sinkage and tempering caused by the entry of spark into air tube are the direct reasons for intercooler blowup. Cylinder failure is due to the waste of ignition energy by spark plug fouling. As a result normal ignition cannot be conducted with the engine. The numerical simulation further proves that when the engine operates within the scope of small load, aggravation of post-combustion and long-time enclosure of intake and exhaust valves in high temperature gas make the valves deform more easily, resulting in valve sinkage.%为了验证新天然气发动机的性能,同时为其升级改造提供依据,对其进行了现场试验.试验结果表明,与纯柴油机驱动钻井相比,并联混合使用天然气发动机和柴油机后,完成卫349-10井的钻井任务可减少碳排放36.05％,节约燃料费用21％；完成卫349平1井的钻井任务可减少碳排放20.19％.天然气发动机故障主要表现为中冷器炸坏和气缸不工作.发动机后燃,气门下陷,火花进入进气管而发生回火是导致中冷器炸坏的直接原因；气缸不工作则是由于火花塞积碳损耗了点火能量,致使发动机不能正常点火.数值模拟结果表明,当发动机在小载荷工作时,后燃加剧,进、排气门较长时间处于高温气体的包围中,致使进、排气门更易发生变形,造成气门下陷.
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