摘要
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 thermo- dynamics 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.
出处
《石油钻采工艺》
CAS
CSCD
北大核心
2011年第5期72-75,共4页
Oil Drilling & Production Technology
基金
国家科技重大专项"大型油气田及煤层气开发"(编号:2008ZX05017)部分研究内容
关键词
气井
水合物
预测模型
防治技术
井下节流
节流温降
工艺设计
gas well
gas hydrate
forecast model
prevention technology
downhole throttle
temperature drop when gas flowingthrough chokes
process design
