WB长3超低渗油藏水平井开发稳产对策研究

Production Stabilization Strategy for Horizontal Well Development of WB Chang3 Ultra-Low Permeability Reservoir

WB长3超低渗致密油藏渗流阻力大、压力传导能力差,开发难度大。超低渗油藏水平井注水开发尚无成熟的经验,水平井弹性开采,产量递减较快,单井稳产难度大,采收率低。本文研究了该井区水平井含水变化规律、递减特征和地层能量变化特征等生产动态特征。通过对比研究不同的开发方式,提出段内多点注水和超前注水是有效控制水平井递减的有效的稳产对策,还通过分析提出了合理的注水参数,有效预防了油井过早水淹。

WB Chang3 ultra-low permeability and great compacted reservoir which has high flow resistance, poor pressure conductivity is difficult to develop. Horizontal well development process with water injection energy is relatively poor, especially for horizontal well development process with water injection energy of ultra-low permeability reservoirs has no mature experience, horizontal well development process with natural energy has fast decrease of production, low recovery and it is difficult to make the production stable. This article studies the the change law of water ratio, decrease of production and the energy of reservoir. Through comparative study on different ways of development, it is found that multi-point water injection and advanced water injection can effectively control the decrease of production for horizontal well. Through the analysis we get reasonable water injection parameters, and it can beforehand to protect watering out from happening too early.