摘要
针对低压产水气井采用地面放空方式排出井筒积液造成天然气浪费和污染环境的问题,开展了同步回转泵降压排水采气工艺试验。该工艺是在采气井和集气站之间增加一个同步回转泵,利用同步回转泵的抽吸作用,通过降低井口压力来提高气井瞬时流量,从而排出井筒积液。试验结果表明:采用该技术后,抽吸可以代替部分低压产水气井的放空排液;泵排量越大,排水效果越好;抽吸时间长短以排出井筒积液为最佳。但同步回转泵增压能力低,排量随着泵进口压力的降低而降低,从而影响排液效果,为此提出了增大泵的容积、提高泵的转速和密封性、多泵串联抽吸提高增压能力等改进措施,为提高同步回转泵的排水效果和适用范围指明了改进方向。
Considering natural gas waste and environment pollution caused by liquid discharge of the wellbore using evacuation method in the low-pressure water producing gas well,the pressure reduction water drainage and gas recovery testing using the synchronous rotary pump has been conducted. The process adds a synchronous rotary pump between the gas recovery well and the gas gathering station. By the suction effect of the synchronous rotary pump,the fluid in wellbore could be discharged by reducing the wellhead pressure to improve the instantaneous flow rate of the gas well. The results show that the suction could be an alternative water discharge method for some low-pressure water producing gas wells. The larger the pump displacement is,the better the drainage performance is. The optimal suction time depends on the required discharge water. But the synchronous pump has a low pressurizing capacity. The displacement decreases with the reduction of pump inlet pressure,thus reducing the water drainage performance.Therefore,measures for enhancing the pressurizing capacity are proposed,including increasing the pump volume,improving the pump speed and sealing performance and adopting multi-pump connected in series,which provides the direction of improving the drainage performance and application range of synchronous rotary pump.
出处
《石油机械》
2017年第6期67-71,共5页
China Petroleum Machinery
基金
"十三五"国家科技重大专项"低丰度致密低渗油气藏开发关键技术"(2016ZX05048)
关键词
低压产水气井
同步回转泵
多泵串联
排水采气
抽吸排液
low pressure water producing gas well
synchronous rotary pump
multi-pump connected in series
water drainage gas recovery
fluid pumping
