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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)
In the case of large difference in permeability between layers, the use of periodic water injection to form an unstable pressure field can improve the development effect of such reservoirs. The results show that the permeability and capillary force are the main factors that affect the effect of periodic water injection. Different working systems, reasonable period of water injection, and the variation range of water injection amount Its effect also has a certain influence. On the basis of this, a field test was carried out on Guan 80 fault block in Wangguantun oil field in Huanghua depression. The results show that periodic injection of multi-layered homogeneous reservoirs can increase the inflow of water under the control of formation energy and injection-production balance Volume and ultimate recovery; water injection should maximize the rate of change, when the contradiction between the layers of prominent, the implementation of stratified cycle of water injection; in compensating for the amount of water and maintaining formation pressure, asymmetric cycle water injection system is better than the symmetry type. Figure 2 Table 4 Reference 1 (Wen Guofeng Abstract)