板桥凝析油气田排液采气工艺技术研究及其应用

STUDY AND APPLICATION OF TECHNIQUES FOR GAS RECOVERY BY LIQUID DRAINAGE IN BANQIAO CONDENSATE OIL/GAS FIELD

板桥凝析油气田地质构造复杂,多为小断块单井构造,井型多为斜深井,已进入开发后期,地层压力降幅大,且普遍存在地层反凝析堵塞以及水驱气藏边底水推进导致的地层严重水锁,井筒严重积液已成为气藏提前废弃的主要原因,并导致最终采收率偏低。文章系统地评价了板桥凝析油气田现有的排液采气技术,筛选了适合板桥凝析油气田以小泵深抽为主的排液采气技术,着重探讨了超深泵挂配套技术中杆柱组合的可靠性和高气液比工况下提高泵效的配套井下工具和配套抽油机工作制度,并针对板桥凝析油气田的实际情况对设计方法和施工工艺进行了探讨,对现场实施情况进行了评价分析。

The geological structure is complicated, which consists of single well structures with small blocks mostly, and the wells are mainly deep deviated wells in Banqiao condensate oil/gas field. The field has entered the late exploitation stage. The reservoir pressure drops greatly. The retrograde condensate plugging exists commonly in the field and the severe water lock of the reservoir appears because the edge and bottom water advances in the water-drive gas reservoir. Serious liquid accumulation in borehole has become the major reason resulting in the gas reservoir abandoned ahead of schedule and caused the lower final recovery factor. The techniques of gas recovery by liquid drainage existing in Banqiao condensate oil/gas field are evaluated systemically. The technique of gas recovery by liquid drainage by deep rod pump with small cylinder is selected, which is suitable for Banqiao condensate oil/gas field. Also it is highly discussed the reliability of the rod string assembly in the matching technique of super-deep pump setting and the working system of the matching down-hole tools and the matching pumping unit that are used to improve the pumping efficiency under the working conditions with high gas/liquid ratio. According to the real situation of Banqiao condensate oil/gas field, the design method and operation process are discussed. Meanwhile, the field application is evaluated and analyzed.