摘要
杜229块1998年投入试采，采用直井蒸汽吞吐开发．截至2007年底，区块开发进入吞吐末期，稳产形势严峻。针对该区块吞吐后期的特点．通过开发机理研究，数值模拟研究等方法，论证了超稠油蒸汽驱开发的可行性。2007年6月在区块中部实施了7个反九点注采井网的蒸汽驱先导试验井组。经过6年的动态调控，先导试验获得成功，并形成了超稠油蒸汽驱“先连通、再汽驱”的开发机理。针对先导试验取得的认识，2013年扩大实施5个蒸汽驱井组时，通过4项措施提高汽驱效果：优化油藏工程设计；注汽井的射孔方式采用限流射孔；转驱前实施整体吞吐，地层压力下降到2．7～3．5MPa，地层温度上升到80℃以上，注采连通达到70％以上；井组转驱前实施最后一次整体预热，强化注采连通，缩短转驱后的热连通时间。通过以上措施，扩大井组转驱后受效时间比先导试验区缩短2个月，高含水的热连通时间缩短4个月，油层纵向动用程度提高23％，油汽比提高0．026，采注比提高0．21。
Du229 block was put into production test in 1998 by cyclic steam stimulation of vertical wells.As it has stepped into the last phase of steam stimulation by the end of 2007 ,the situation of stable yield is increasingly stern.ph Based on the research of development mechanism and numerical simulation,the feasibility of the steam flooding for the super heavy oil has been discussed according to the characteristics of the last phase of steam stimulation in this block.Since the pilot test was carried out in July 2007,seven inverted nine-spot well groups in central block have been implemented by now.After dynamic regulation and control for 6 years,the pilot test succeeded and the mechanism of oil displacement through the steam flooding for the super heavy oil has been formed as connecting first and then displacing.According to the understanding of the pilot test,four measures were selected to improve the effect of steam flooding in expanding 5 well groups in 2013.The first,the reservoir engineering design was optimized;Second,the limited entry perforation technique was adopted for the steam injection well production;Third,huff and puff was implemented before steam flooding under the conditions that formation pressure drops to 2.7 to 3.5MPa,formation temperature ris- es to 80~C above and injection/production connectivity reaches more than 70% ;Fourth,the last time of the overall preheating was made before steam flooding and the injection/production connectivity may be enhanced for shortening the thermal connection time after the steam flooding groups was 2 months shorter than the pilot test area,and the thermal shorten by 4 months.The longitudinal producing degree of oil layers .The effective time of expanding well connection time of high water cut was increased by 23% ,oil-steam ratio increased by 0.026 and production-injection ratio increased by 0.21.
出处
《中外能源》
CAS
2015年第6期52-55,共4页
Sino-Global Energy
关键词
超稠油
蒸汽驱
限流射孔
整体预热
油汽比
采注比
纵向动用程度
super heavy oil
steam flooding
limited entry perforation technique
overall preheating
oil-steam ratio
production-injection ratio
longitudinal producing degree
