应用数值模拟技术研究周期注水

在层间、层内渗透率差异较大的情况下,利用周期注水来形成不稳定压力场,可以提高该类油藏的开发效果。应用油藏数值模拟技术,结合室内研究成果,对周期注水机理进行研究分析,结果表明,渗透率和毛管力是影响周期注水效果的主要因素,不同工作制度、合理周期注水、注水量变化幅度对其效果也有一定影响。在此基础上,对黄骅坳陷王官屯油田官80断块开展矿场试验,结果证实:在保持地层能量和注采平衡的基础上,多层均质油藏采用周期注水可以提高注入水的波及体积和最终采收率;应最大限度提高注水量变化幅度,当层间矛盾突出时,可实施分层系周期注水;在弥补水量和保持地层压力方面,不对称型周期注水工作制度优于对称型。图2表4参1(闻国峰摘)

Applying the numerical reservoir simulation technique to study cyclic waterflooding

In the condition of a bigger inner layer and inter layer, non stabilized permeability contrast pressure field is formed by utilizing cyclic waterflooding, which may improve development effect of waterflooding reservoir. By applying the numerical reservoir simulation technique and combining laboratory research product, the mechanisms of cyclic waterflooding has been analyzed. It is manifested that permeability and capillary force are main factors influencing cyclic waterflooding effect. In addition, different working system, rational waterflood cycle and water injection rate varying range are also having certain influence. On the basis of this a pilot test of cyclic waterflooding in Guan 80 fault block of Wangguantun oil field in Huanghua depression is made, with results showing that cyclic waterflooding can enhance recovery factor and increase the swept volume of multiple zone heterogeneous reservoir under the circumstance that the formation energy is maintained and injection and production rates keep equilibrium. It should maximize the water injection variation. When the inter zone contrast is more serious, a zonal cyclic waterflooding should be applied. With regarding to water supplement and formation pressure maintenance, dissymmetrical cyclic waterflooding is better than symmetrical one.