地形复杂气田集气半径变化规律研究

Study on Variation Law of Gas Gathering Radius for Gas Fields over Complex Terrain

复杂地形气田压降和流量损失较大,集气半径较小。基于重庆某气田生产数据,针对水平、上倾和下倾地形,改变管道高差及倾角,分析压降、积液量和流速的变化趋势,发现相同压降下管道倾角越大,集气半径越小。针对V、N、W、M型地形计算管道压降,发现M地形压降最大。针对给定的集气半径,计算M地形下压降、积液量和流速等参数,发现管道压降随流量增加经历显著降低、发生振荡和显著上升3个阶段,据此确定不同集气半径对应的流量和管径匹配范围,为气田集气半径的选择提供参考。

The pressure drop and flow loss of complex terrain gas fields are large and the gas gathering radius is small.Based on the production data of a gas field in Chongqing,for the horizontal,upward and downward terrains,the height difference and inclination of the pipeline were changed,and as pressure drop,fluid accumulation and flow velocity were analyzed respectively.The results show that the larger the pipe inclination under the same pressure drop,the smaller the gas gathering radius.For the V,N,W and M terrains,the pipe pressure drop was calculated,and it is found that the pressure drop of the M terrain is the largest.Under the premise of a given gas gathering radius,parameters such as pressure drop,liquid accumulation and flow velocity of M terrain were calculated respectively.The results show that with the increase of gas flow rate,the pipe pressure drop experi⁃enced three stages,significant decrease,oscillation and significant increase.Based on the above conclusions,the matching ran⁃ges of gas flow rate and pipe diameter under different gas gathering radius were determined,which provides reference for the se⁃lection of gas gathering radius.