摘要
杜84块兴Ⅵ组SAGD先导试验区经过8年开发,水平生产井水平段上覆储量采出程度已达70%,进入SAGD开发后期,存在问题较多,主要表现为蒸汽腔压力高、蒸汽用量大,蒸汽腔热损失大、热能利用率低,蒸汽腔进入下降阶段、泄油效率低,且油汽比降至0.15,继续采用SAGD开发已不经济。为改善兴Ⅵ组SAGD先导试验区效果,探索利用SAGP(Steam And Gas Push)方式,向蒸汽腔注入氮气,利用氮气填充蒸汽腔,从而减少蒸汽注入量、降低热损失、提高泄油效率,改善油汽比。根据兴Ⅵ组SAGD先导试验区实际情况,对蒸汽及氮气注入量等参数设计优化,最大限度减少蒸汽用量,提高油汽比,方案设计油汽比由0.15提高至0.30。经过半年的现场实施,试验区各项开发指标明显改善,油汽比达到0.33;监测资料显示汽腔顶部形成低温氮气层,有效降低了热损失;措施实施后已累计创效1402万元。SAGP的成功实施为后SAGD阶段探索出可行的接替技术。
SAGD pilot area in Xing Ⅵ Formation of Block Du84 has been developed for 8 years. Recovery percent of overlying reserves in horizontal section of the horizontal production well has up to 70%.It has en-tered into late SAGD phase.There are several prominent issues such as high pressure in steam chamber,more steam consumption,higher heat loss in steam chamber,low utilization of heat energy,lower efficiency of oil drainage and son on.The current oil steam ratio reduces to 0.15,and SAGD development is uneconomical any more.In order to improve the effect of SAGD pilot area in Xing Ⅵ Formation,SAGP（Steam and Gas Push）was tried to be applied.Nitrogen was injected into the steam chamber,and then filled it,which resulted inless steam consumption and heat loss,more oil drainage efficiency and improved oil steam ratio.According to actual situation of SAGD pilot area in Xing Ⅵ Formation,steam and nitrogen injection parameters were optimized so as to minimize steam consumption and maximize oil steam ratio from 0.15 to 0.30.After field im-plementation for half year,development indexes have obviously improved such as the oil steam ratio was up to 0.33.The monitoring results show that low temperature nitrogen layer was formed on top of the steam chamber,which the made heat loss reduce effectively.After the implementation of SAGP,cumulative efficiency was 14.02 million yuan.Successful implementation of SAGP explores feasible replacing technology at late SAGD phase.
出处
《中外能源》
CAS
2016年第5期46-49,共4页
Sino-Global Energy
