关键词: 缝洞型, 碳酸盐岩油藏, 注水替油, 数值模拟, 参数优化

Abstract:

The ordovician reservoirs in Lungu well area of Tarim Oilfield belong to the fracture-cavity carbonate reservoirs，
which are highly non-homogeneous. Single-well oil production declines rapidly because of reservoir energy shortage. Water
huff and puff（cyclic water stimulation）is a novel method for the exploitation of the fracture-cavity carbonate reservoir，which
can substantially improve single-well productivity. Whether the injection-production parameters of water huff and puff technology
are appropriate is essential to the oilfield development. Based on the geological and fluid information of the typical
water huff and puff well，the geological model for water huff and puff technology is built to optimize the corresponding factors
which include injection timing，cyclic water injection rate，injection speed，soaking time and daily fluid production rate. In
this research，the corresponding factors are dimensionless or correspond to fitting formula to eliminate the effects of production
performance differences before water injection and make the optimized parameters more effective.

Key words: fracture-cavity, carbonate reservoir, water huff and puff, numerical simulation, parameter optimization