摘要
超稠油注蒸汽吞吐开发中发生层间汽窜的突出表现是地表窜汽,造成产能损失,使地表窜汽区域储量不能利用。由于注汽压力远大于油层压力,经过一段时间的吞吐生产,套管与固井水泥环间会产生缝隙,后续注汽时蒸汽沿此缝隙上窜,就会从水泥环薄弱部位进入上覆砂层。当窜入该砂层的蒸汽量达到一定程度后,若继续注汽,蒸汽就会从该砂层薄弱部位喷出地表而产生窜汽。其原因主要是超稠油注蒸汽吞吐开发时的采注比小于1,且长期压注所致。解决的方法是提高排液能力,封堵套管窜槽部位。
The steam stimulation exploilation of super heavy oil is of obvious characleristic of interlayer steam breakthrough, resulting in loss of productivity and not producing of the reserves in area with steam breakthrough. Because the steam injection pressure is much higher than the reservoir pressure, a number of cracks may produce between casing and cement sheath after a period of production by steam stimu- lation process. Follow-up injected sleam will flow up along the cracks and enter into overlying sand layer from the weak parts of cement sheath. When the steam amount reaches a certain degree and steam injection continues, the steam will erupt from the weak parts of the sand layer and form steam breakthrough. The reason fi^r this is that the prnduction-steam injection ratio is less than 1 and long-term steam injection in high pressure during steam stimulation development of the super heavy oil in this area. It is snggested that to increase the drainage capacity and plug the cracks in casing are the feasible solutions.
出处
《新疆石油地质》
CAS
CSCD
北大核心
2012年第5期607-609,共3页
Xinjiang Petroleum Geology
关键词
准噶尔盆地
超稠油
地表窜汽
套管
固井
采注比
Junggar basin： super heavy oil： surface steam breakthrough
casing
cementing
production-steam injection ratio
