φ139.7mm套管井热采桥塞封堵工艺

Blocking technology with bridge plugs for heavy oil thermal recovery on φ139.7mm casing wells

采用φ139.7mm套管完井的中、浅薄层低品位复杂小断块稠油油藏,由于油水关系复杂,存在热采井生产见水早,含水上升快,边水突进迅猛的问题。研究开发了φ139.7mm套管井热采桥塞封堵工艺,对2套堵水工艺管柱进行了介绍,并重点介绍了其中的关键工具——热采丢手接头和集丢手、坐卡、坐封、解封功能于一体的新型φ139.7mm套管井热采桥塞的结构、工作原理及技术特点。现场应用表明,该技术可以实现小尺寸套管稠油热采井的高温堵水作业,为低品位稠油油藏的经济有效开发提供了技术支撑。

The heavy oil reservoirs of Henan oilfield are such small complex fault blocks in shallow thin beds that their water and oil relationships are complex. As a result, there are troubles such as early water breakthrough, quick increasing water-cut and fast edge water incursion in the thermal recovery on slim-hole heavy oil well. To provide a novel blocking approach for the downhole high-temperature water resulting from these problems, a blocking technology with bridge plugs is developed. Firstly, two sets of assemblies with bridge plugs for the blocking technology are presented. Secondly, characteristics, structures, and operating principles of the key parts of the two assemblies such as the release sub and the novel bridge plug which is integrated with functions of releasing, seating, setting, unsetting are described. Lastly, field applications verified the feasibility of this blocking technology with bridge plugs. The results show that the development of this blocking technology with bridge plugs might provide sound support for economic and effective heavy oil recovery in low-grade reservoirs.