摘要
对塔河油田和塔里木油田缝洞型油藏单井缝洞系统部分油井注水引起含水率大幅升高的现象进行研究,分析了注水对油井含水率的影响机理。通过分析储层特征,简化单井缝洞系统,并结合理论计算分析来认识缝洞系统内油水界面的变化规律,结果表明:油井见水后对单井缝洞系统进行注水替油会对油井含水率和产油量有较大的影响,即油水界面距离井底较近的情况下,注水会引起含水率大幅度升高,甚至水淹,其原因在于缝洞系统内油水界面的位置与井底的距离较近,注水会大幅度升高油水界面,引起油水界面快速跃至井底,使得油井含水率大幅度升高,建议针对该种情况进行缝洞单元的油水界面分析及剩余储量计算和经济评价,适当采用缝洞体内侧钻或注气开发等增产措施。
Aiming at the sharp rise of water content caused by water injection in the partial oil wells of single well fractured-vuggy system in the fractured-vuggy reservoir of Tahe Oilfield and Tarim Oilfield,the impact mechanism of water injection on water content of oil well is analyzed.Change rules of oil-water contact for fractured-vuggy system is identified by the analysis of reservoir characteristics and the simplification of single well fractured-vuggy system,combined with theoretical calculation.The study result shows that the replacing oil with water injection in single well fractured-vuggy system will affect the water content and production rate after water breakthrough of oil well.When the oil-water contact is close to bottom hole,water injection will result in the sharp rise of water content,even waterflooding.The reason is that the oil-water contact position is close to bottom hole in fractured-vuggy system,and water injection will raise the oil-water contact,which create the oil-water contact to reach the bottom hole and make the water content of oil well sharply rise.So it is recommended that the analysis of oil-water contact and the remaining reserves calculation and economic evaluation in the fractured-vuggy units should be carried out,and the sidetrack drilling or gas injection production should be properly adopted.
出处
《断块油气田》
CAS
北大核心
2011年第4期479-481,共3页
Fault-Block Oil & Gas Field
基金
国家重点基础研究发展计划(973)项目"碳酸盐岩缝洞型油藏开发基础研究"(2006CB202404)
国家自然科学基金项目"缝洞型碳酸盐岩油藏溶洞参数识别方法研究"(51074176)联合资助
关键词
缝洞
含水率
注水
碳酸盐岩
溶洞
fractured vuggy
water content
water injection
carbonate rock
cave
