苏桥储气库生产井井下节流技术合理气水比研究

为了确定苏桥储气库有水气井井下节流技术适宜的生产气水比条件，在930 m模拟实验井上，开展了空气—水两相嘴流实验。利用油嘴流型观察窗和实时采集的实验数据，分流态对嘴流现象及特点进行了观察和分析。研究结果表明:由于液体段塞流过孔眼所需生产差压远大于气体，段塞流条件下液体在嘴前回落严重，油嘴前后压力、产气量、产水量波动幅度大，嘴流稳定性差；环雾流条件下4参数波动幅度小，嘴流稳定性好。确定了苏桥储气库有水气井段塞流向环雾流转化的气水比条件为1 800~2 000 m3/m3。嘴流稳定关系到举升管的正常排液，因此有水气井井下节流技术适宜的生产条件为环雾流；对于大液量气井，井筒为段塞流时嘴径不宜太小。

Applicable gas-water ratio experiment research for downhole throttle technique of production well in Suqiao gas storage

In order to determine the applicable gas-water ration production conditions in water-producing gas wells with downhole throttle in Suqiao gas storage,an air-water two phase choke test was conducted based on stimulated experiment well with depth of 930 m.through choke flow pattern watch window and real-time gathering data,the performance and characteristic of choke flow have been monitored and analyzed under various flow forms.The results showed that the desired production differential pressure for slug fluid flows through wellhole was greater than that for gas,and which resulted in that a large part of liquid fell back to bottom hole;pressures before and after chock,gas and water productions all had large fluctuation,meanwhile,the stability of chock flow was very poor.While the flow pattern was mist flow,those parameters changed slightly and choke flow became rather stable.So the applicable gas-water ration of water-producing gas wells with downhole throttle in Suqiao gas storage is 1800~2000 m3/m3 for slug transmitting to mist flow.Considering the effect of two-phase choke stability on tubing water drainage,the suitable condition for throttling downhole is mist flow,and the chock radius should not design too small for slug flow in large amount volume of gas well.