气井井下节流工艺设计方法研究与应用

Research and application for down-hole throttle process design in gas well

齐桃 吴晓东 冯益富 张庆生 史晓贞

QI Tao WU Xiaodong FENG Yifu ZHANG Qingsheng SHI Xiaozhen

中海石油研究中心，北京　100027 中国石油大学，北京　102249 胜利油田胜利采油厂，山东东营　257041 中原石油勘探局采油工程技术研究院，河南濮阳　457001

Research Center of China National Offshore Oil Comporation. Beijing 100027, China China University of Petroleum, Beijing 102249, China Shengli Plant of Shengli Oilfield Corp, Dongying 257041, China Oil Production Engineering Technology Research Institute, Zhongyuan Oilfield, Puyang 457001, China

气井在生产过程中，在一定温度、压力及含水率条件下会产生天然气水合物，导致阀门堵塞、气井停产、管道停输等严重事故。为有效防止天然气水合物对气井生产的危害，结合图解法和统计热力学两种水合物预测模型，利用VDW和RK两种立方型状态方程求解节流温降模型，详细介绍了气井井下节流工艺参数设计的过程，并结合气井现场数据，对比分析了4种不同水合物预测模型和节流温降模型组合计算结果与生产数据的误差。研究结果可以为气井井下节流工艺设计提供参考。

Under the given temperature, pressure and water cut conditions, gas hydrate will develop during the production of gas well, which is a well recognized operational hazard. It could lead to serious accidents such as plugging of the choke, the gas production halt and the shut down of pipelines. In order to avoid the mischief caused by gas hydrate, combining graphic with statistical thermodynamics gas hydrates prediction models; using both VDW and RK cubic EOS to solve model of temperature drop when gas flowing through chokes. The steps of designing downhole throttling parameters are detailed introduced. Combining gas well data in-site, four different groups of gas hydrates prediction models and throttling temperature drop models are calculated and the results were compared with the actual field data. Results show that the research can supply a more reliable support for the technical design of gas hydrate prevention.