宝浪油田低渗透油藏水驱渗流特征实验研究

方法根据宝浪油田地质特征，选取有代表性的样品实验研究了宝浪油田低孔、低渗油藏水驱油渗流特征。目的验证宝浪油田水驱油的渗流特征，据此提出其油田注水开发过程中应注意的问题。结果宝浪油田低孔、低渗油藏渗流特征具有低速非达西渗流的启动压力梯度和临界压力梯度较高、束缚水饱和度较高、残余油饱和度较低、残余油状态的相对渗透率较高、两相流动区间较宽的特点；相渗曲线类型多，其中水相相渗曲线形态以直线为主；水驱压力梯度、注入水水质、孔隙结构对油水渗流及水驱油效率有重要影响。结论宝浪油田无水期驱油效率和最终驱油效率高。为了获得较理想的水驱油效果，必须对油层进行改造；在注水开发时要严把注水水质关，在开发部署上应尽量延长无水采油期

Experimental study on percolation features of water drive of low permeability reservoir in Baolang oil field

Method\ Based on geologic features of Baolang oil field, representative samples are chosen to carry out experiment study on percolation characteristics of water drive here. Purpose\ To verify percolation features of water drive in Baolang oil field and use the same to find points need attention during water drive development period. Result\ Baolang oil field is a low porosity and low permeability one, whose percolation features are as follows: starting pressure gradient of low velocity nondarcy percolation; critical pressure gradient, irreducible water saturation and relative permeability of residual oil are relatively high; low saturation of residual oil, flow distance between two phases relatively wide; types of phase permeability curves are rich, phase permeability curves of water phase are mainly lineal type; pressure gradient of water drive, injected water quality and porous structures have important influence upon oil/water percolation and oil displacement efficiency of water drive. Conclusion\ In Baolang oil field, despite both high oil displacement efficiency and high ultimate displacement efficiency can be expected at breakthrough production period, improvement action must be taken on oil producing formation to obtain relatively ideal result in water drive, such as set strict requirements for water quality control and extend breakthrough production period as long as possible.