液力驱动无杆泵排采技术在保-平10水平分支井的应用

Application of Hydraulic Drive Rodless Pump Drainage Gas Production Technology in Bao-Ping 10 Horizontal Multilateral Well

保-平10水平分支井原采用有杆泵排采工艺,泵挂深度处在水平分支主井眼水平段,在生产中杆管偏磨问题较为突出,排采效率低,能耗高,经济效益差。该井前期生产中,杆管偏磨及煤粉堵塞等导致频繁检泵,检泵周期短,泵效低。经过反复论证,在上下行程换向、井口限压、煤粉自清洁、自携液举升4个方面进行创新设计。采用井口限压产生液力反馈驱动无杆泵下行程,避免水平井杆管偏磨;推导出不同内层管自喷携液所需最小产气量,在后期产气量上升,产水量下降后实现向自产气携液举升的转换;充分利用地层能量实现速度管携液自喷,降低能耗,降低生产运行成本,提高煤层气井生产的经济效益。

In Baoping 10 horizontal branch well,sucker rod pump drainage technology was originally used,and the pump hanging depth was in the horizontal section of the main hole of horizontal branch.In production,the problem of eccentric wearing of rod and tube was prominent,with low drainage efficiency,high energy consumption and poor economic benefit.In the early production of this well,eccentric wearing of rod and tube and coal powder blockage caused frequent pump inspection,with short pump inspection cycle and low pump efficiency.The innovative design was carried out in four aspects:up and down stroke reversing,wellhead pressure limiting,pulverized coal self-cleaning,and self-carrying liquid lifting.Hydraulic driven rodless pump was used for drainage production to avoid eccentric wearing of rod and pipe.At the same time,the conversion to self-produced gas liquid carrying lifting was realized after the gas production increased and water production decreased in the later stage,and the formation energy was fully utilized to realize the liquid carrying self-propelled by velocity pipe injection,reduce energy consumption,reduce production and operation costs,improve the economic benefits of CBM production.