摘要
针对新疆超稠油蒸汽吞吐采出程度低，瞬时油汽比呈指数递减，经济效益较差的问题，在重32井区筛选出9个先导试验井组，运用室内蒸汽驱替实验和数值模拟方法，对蒸汽吞吐后转蒸汽驱合理的井网井距、剩余油饱和度、热连通程度、蒸汽驱方式、蒸汽干度、原油黏度等指标进行了详细分析。研究结果表明，边井井距在50~60 m 时，超稠油直井反九点井网转蒸汽驱是可行的。开展蒸汽驱先导试验，历时2.5 a，蒸汽驱阶段采出程度为17.14%，阶段油汽比为0.11，试验取得较好效果，为类似油藏开展蒸汽吞吐转蒸汽驱提供了借鉴。
Huff and puff recovery for ultra- heavy oil reservoirs in Xinjiang is characterized by low production,exponent decline of instantaneous oil /steam ratio and poor economic benefit. In this regard,9 pilot test well groups are selected from Chong- 32 well field for laboratory experiment and numerical simulation of steam drive. Some indicators for steam drive after huff and puff are analyzed,including reasonable well pattern /spacing,remaining oil saturation,thermal connectivity,steam drive approach,steam dryness and crude viscosity. The results indicate that,when the spacing between edge wells is 50 ~ 60 m,it is feasible to convert inverted nine spot flooding pattern in ultra- heavy oil reservoir with vertical well to steam drive. Pilot test of steam drive is conducted.After 2. 5 a,the recovery degree is 17. 14%,and the oil /steam ratio is 0. 11,recording good results of steam drive. The results provide references for steam drive after huff and puff in similar reservoirs.
出处
《特种油气藏》
CAS
CSCD
北大核心
2014年第4期130-133,157,共4页
Special Oil & Gas Reservoirs
基金
国家科技重大专项"薄层稠油和超稠油开发技术"(2011ZX05012-004)
关键词
超稠油
蒸汽驱
提高采收率
井网井距
重32井区
ultra-heavy oil
steam drive
EOR,well pattern /spacing
Chong-32 well field
