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低渗透油藏受特殊的成藏条件、沉积环境影响,具有孔隙结构复杂、孔喉半径细小,油藏渗透率低,一般小于50×10-3μm2;储层非均质严重,平面渗透率级差最高达几百个数量级;驱替压力大、存在一定的启动压力;天然裂缝发育且存在人工裂缝等特点;因此,在不同渗透率级差下,如何建立起有效的驱替半径,建立合理、经济的井网井距,对提高低渗油藏水驱油效率及采收率,提高低渗透油藏的开发水平具有十分重要的意义。以低渗透油藏唐157井区为例进行研究,建立了合适的井网井距。
Low permeability reservoirs are affected by special reservoir forming conditions and sedimentary environment, with complex pore structure, small pore throat radius and low reservoir permeability, generally less than 50 × 10-3μm2. The reservoirs are heterogeneously graded with a difference in plane permeability Up to hundreds of orders of magnitude; displacement pressure, there is a certain start-up pressure; natural fractures and the presence of artificial cracks and other characteristics; therefore, under different permeability levels, how to establish an effective displacement radius, to establish a reasonable and economical Well spacing of wellbore is of great significance to improve water flooding efficiency and oil recovery of low permeability reservoirs and improve the development level of low permeability reservoirs. Taking low permeability reservoir Tang 157 well for example, a well spacing of wells was established.