小井距调整在低渗透油藏中的研究及应用

为了提高低渗油藏宝浪油田B区块Ⅰ+Ⅱ油组非主力层注水开发效果和剩余油动用程度,针对工区开发中存在的问题,应用渗流力学理论开展了小井距调整可行性论证,在整体部署的基础上选取3个井组进行先导试验,并对实施效果进行了分析。结果表明:①B区块Ⅰ+Ⅱ油组非主力层地质储量为303.29×104 t,采出程度较低,为10.8%,水淹程度相对较低,为36.85%;②小井距试验井网形式为不规则四点法或五点法面积注水井网,井距确定为150~200 m;③3个井组先导试验合计增油8186.9 t,其中宝1315井组效果显著。以上成果认识为挖潜老油田剩余油潜力提供了广阔空间。

Research and Application of Small Well Spacing Adjustment in Low Permeability Reservoir

In order to improve the water injection development effect and residual oil utilization degree of the non-main layer ofⅠ+Ⅱoil group in B block of the low-permeability reservoir Baolang,the feasibility of small well spacing adjustment was carried out by using the theory of seepage mechanics for the problems existing in the development of the work area.Based on the overall deployment,three well groups were selected for pilot testing and the implementation effects were analyzed.The results showed that:①The non-main layer geological reserves ofⅠ+Ⅱoil group in block B is 303.29×104 t,the harvesting degree is low,just 10.8%,and the flooding degree is relatively lower at 36.85%.②The small well spacing test well pattern is irregular four-point method or five-point method area injection well network,the well spacing is determined to be 150~200 meters.③The three well group pilot tests totaled 8186.9 t of oil increase,of which B1315 well group has significant effect.The above achievements have provided a broad space for tapping the remaining oil potential of the old oilfield.