超稠油水平井分隔配注技术研究与应用

Research and Application of Separated Steam Injection Allocation in Horizontal Well of Super Heavy Oil

随着钻井技术的不断提高,水平井在超稠油开发中的应用越来越广泛。同时,随着水平井实施规模的不断扩大,普遍存在水平段动用不均的问题。由于水平段长,且采用筛管完井,常规笼统注汽方式的注汽管柱只有一个出汽孔,且下至水平段前部,使水平段注汽管柱内沿程压力分布不均,局部压力高,加上水平段油层非均质性强,近而造成水平段沿程动用不均。为改善开发效果,依据水平井温度监测曲线,合理判断水平段剖面动用状况,应用水平井分隔配注工艺技术,下入耐高温封隔器,将水平段注汽管柱与筛管之间环形空间独立分隔成几段注汽腔室,并对封隔器位置、尺寸和注汽量进行优化设计,采用注汽阀对各段腔室灵活分配注汽量,实现对水平段不同区域分段注汽,提高水平段动用程度,为油田开发持续稳产提供依据。

With the continuous improvement of drilling technologies,the application of the horizontal well for super heavy oil exploitation is getting wider and wider.And along with the continuous larger scale of horizontal well application,uneven production on horizontal sections has become normal issue.The reason is well completion by screen pipe,severe heterogeneous oil reservoirs and uneven pressure distribution in steam-injection string on horizontal section results from one steam vent on the steam-injection string located at the front of long horizontal section.In order to improve the development result,the temperature monitoring curves of the horizontal well can be applied for rational judgment of the production of horizontal section profile.Separated steam injection allocation technology for the horizontal well is applied.Thermal packer is run into wells for separating annulus space between steam-injection string and screen pipe of the horizontal section into several independent steam injection cavities.And the position,size of the packer and steam injection rate may be optimized.Flexible allocation of steam injection rate for each cavity will be realized through steam injection valve.Segmented steam injection for different areas of the horizontal section will be achieved,so that the production degree of the horizontal section will be raised.It will provide technical basis for continuous stable production in the oilfield development.