摘要
油田进入特高含水期后,受储层韵律性、平面非均质性、断层边界及纵向夹层等影响,油层水淹规律及剩余油分布十分复杂。为进一步提高油田采收率,结合新钻井水淹层测井解释成果、密闭取心、生产动态及油藏数值模拟等资料,对渤海Q油田水淹特征和剩余油分布规律进行深入研究,并提出相应的调整井挖潜策略。认为油层底部、井点附近及边水油藏注采主流线水淹严重,油层中上部、井间区域、遮挡带附近和底水油藏边部水淹较弱或未水淹,纵向上井间区域水淹层占比为8%~65%,平面上生产井有效动用半径为70~150 m。提出利用水平井进行井间加密、边部完善井网、垂向穿夹层动用屋檐油及井网调整等挖潜策略。结果表明:利用水平井挖潜特高含水期剩余油,可有效改善开发效果,提高油田采收率,并为海上类似油田的调整挖潜提供借鉴。
After an oilfield enters the extra high water cut period,the flooding of the oil layer and the remaining oil distribution would become very complicated under the factors of reservoir rhythm,plane heterogeneity,fault boundary,and longitudinal interlayer.To enhance the oil recovery,the reservoirs in the Bohai Q Oilfield was targeted for the study.The logging interpretation of water-flooded layers in new wells,sealed coring,production dynamics,and numerical simulation were combined,and the flooding characteristics and remaining oil distribution were studied in depth.Corresponding adjustment for well tapping strategy was proposed.It was found that in the bottom of the oil layer,near the well point,and along the main line of the side water reservoir were heavily flooded,while the upper part of the oil layer,the inter-well area,the vicinity of the shielding zone,and the edge of the bottom water reservoir were weakly or not flooded.In the vertical direction,the proportion of regional water-flooded layers was 8%~65%,and in the horizontal,the effective utilization radius of production wells on the plane was 70~150 m.It was proposed to use horizontal wells to reduce inter-well distance,penetrate vertically interlayer to drive trapped oil,and adjust the well network.Results show that using horizontal wells to tap residual oil of the extra high water-bearing period could improve effectively the production,increase the oil recovery,and provide a reference for the operation and production in similar offshore oil fields.
作者
金宝强
舒晓
邓猛
JIN Bao-qiang;SHU Xiao;DENG Meng(Tianjin Branch Bohai Petroleum Research Institute CNOOC(China)Co.,Ltd.,Tianjin 300459,China)
出处
《科学技术与工程》
北大核心
2020年第15期6033-6040,共8页
Science Technology and Engineering
基金
国家科技重大专项(2016ZX05058001)。
关键词
特高含水期
渤海Q油田
水淹特征
剩余油分布规律
挖潜策略
extra high water cut period
Bohai Q oil field
flooding characteristics
residual oil distribution law
potential tapping strategy
