礁灰岩油田双重控水增产技术认识与实践

Study and Practice of Dual Water Control and Production Increase Technology in Reef Limestone Oilfields

针对南海东部礁灰岩L油田高角度裂缝发育导致调整井含水上升快、开发效果差等问题,采用"ICD+连续封隔体过饱和充填"双重控水技术,封隔体颗粒在高压阶段充填裂缝以降低其导流能力,低压阶段充填环空抑制轴向窜流。基于礁灰岩油田基质裂缝双重介质油藏模型,首次实现双重控水增产技术的模型表征和效果定量化评价。结果表明:调整井采用先高压后低压的方式充填封隔体,充填率超200%,生产初期含水率平均降低约24%,含水上升速度减缓,单井技术可采油量平均增加15%。该技术的应用预计可为油田后续挖潜增加技术可采油量近1.0×10^(6)m^(3),并为类似的裂缝性油田开发提供了控水方案参考。

Aiming at the problems of rapid water cut rise and poor development effect caused by high-angle fractures in the reef limestone L oilfield,the dual water control technology of “ICD + continuous packer supersaturated filling”was used.The packer particles filled the fractures in the high pressure stage to reduce its conductivity,and packing body filled the annulus in the low pressure stage to suppress axial channeling.Based on the dual media reservoir model of matrix and fracture in large reef limestone oilfield,the model characterization and quantitative evaluation of water control and production increase technology with continuous packer supersaturated filling were realized for the first time.The results showed that adjustment wells’ filling rate was over 200% with filling pattern of high pressure followed by low pressure.The initial water cut was significantly reduced by about 24% on average,and the water cut rising speed slowed down.The oil recovery of single well technology was increased by 15% on average.The analysis results proved that the extent of cracks filling was the main factor for the effect of water control and production increase.The application of this technology is expected to increase technical recoverable reserves of nearly 1.0×10^(6)m^(3) in the subsequent potential tapping of the oilfield,and it also provides reference for water control scheme for similar fractured oilfields.