天然气开采过程中,井下高压气体输送到中心处理厂前,需要对井下气体降压至输送管道允许压力值,在高压、高产的情况下,天然气对油嘴(节流阀)的破坏十分严重.本工作结合现场收集资料、磨损机理及流体分析软件对井口节流装置——笼套式油嘴进行内部流场模拟研究其失效机理,通过研究提出增强节流阀使用寿命的建议.Cameron公司生产的CC50HP油嘴是本工作研究的主要模型,经分析认为笼芯短期失效的主要原因是:高压高流量气体的冲蚀,可见冲蚀所导致的严重后果不容忽视,改善冲蚀现象必要性显而易见.

During the gas exploitation process,the pressure of high pressure underground gas should be lowered down to the allowable pressure of pipelines before it is delivered to the gas-processing center.In the circumstances of high pressure and high yielding,the damage of natural gas to the control choke is serious.Combined with the field data,wearing mechanism and use of computational fluid dynamics (CFD) software,the failure mechanism of wellhead control choke was studied through flow field simulation,and some advise to prolong the service life of control choke was proposed.The main study mode was CAMERON CC50HP produced by Cameron International Corporation.The results showed that the primary cause of short time failure was the erosion of high pressure.It is clear that the serious consequence of erosion can not be ignored,and more attention should be paid to it.