超低渗油藏超前注水井网适应性研究

B153 区长63 油藏属超低渗油藏，单井产量低、产量递减速度快、稳产困难，目前采用超前注水的开发方式，但是效果不明显，单井产量并未明显提高。利用油藏工程与数值模拟方法，结合该区目前采用的井排距组合及井网类型，分析了超前注水开发效果不理想的原因。认为：目前井距过大，注入水只起到稳压并未起到驱油的作用，应适当加密调整；计算得到其合理井距为258 m，排距为152 m；井网类型建议初期选择方形反九点井网，后期调整为五点井网。研究为具有类似特征的油藏能够采用合理的井网井距进行有效开发 提供了借鉴。

Research on Advanced Water Injection Well Pattern Adaptability in Ultra-Low Permeability Reservoir

Chang63 reservoir of B153 area is an ultra-low permeability reservoir, in which low single-well production and oil production depletes seriously, and it’s very difficult to maintain stable production. Advanced water injection is being adopted in this reservoir currently, but the effect is not apparent, and single-well production has not improved significantly. Reservoir engineering and numerical simulation method are used in this paper，and combining with current well pattern and well space, we analyze the reasons why advanced water injection is not ideal. The result indicates current well space is too large, and the injected water can only stabilize the pressure but can’t drive the oil, so the well pattern should be appropriately adjusted. Its reasonable well spacing is 258 m, row spacing is 152 m according to calculation. Square anti-nine-spot pattern in the early time and then adjust to five-spot pattern at the late period of development are suggested. The study can be used for reference in arranging reasonable well spacing to make effective development in similar reservoirs.