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作为低渗砂岩储层开发的主体开发技术,注水工艺运用频率越来越多。低渗砂岩储层的物性差、孔隙结构复杂、非均质严重、天然能量不足以及压敏性强等特点,这些决定了注水工艺与中高渗油田不同,技术要求更高。为了高效开发低渗砂岩油藏,本文着重研究了注水时机和超前注水倍数,并利用容积法建立了超前注水倍数与地层压力升值之间的关系模型。然后结合低渗储层两相渗流特征,分析了超前注水倍数对两相渗流的影响;另外从岩石力学模型出发,研究了超前注水对地层应力和地层破裂压力的影响。最后,通过低渗砂岩油藏实例注水开发进行了系统分析和设计。
As the main development technology for the development of low-permeability sandstone reservoirs, waterflooding technology is used more and more frequently. The properties of low-permeability sandstone reservoirs are poor, the pore structure is complex, the heterogeneity is serious, the natural energy is insufficient and the pressure-sensitive is strong. These determine that the water injection technology is different from the medium-high permeability oilfield, and the technical requirements are higher. In order to develop low-permeability sandstone reservoirs efficiently, this paper focuses on the timing of water injection and the multiple of advance water injection, and establishes the model of the relationship between the advance water injection multiple and formation pressure appreciation by volume method. Combined with the characteristics of the two-phase seepage flow in the low permeability reservoir, the influence of the advance injection multiple on the two-phase seepage is analyzed. In addition, the influence of the advanced injection on the formation stress and formation fracture pressure is studied based on the rock mechanics model. Finally, the system analysis and design are carried out through the injection development of low permeability sandstone reservoir.