低渗透油藏加密井评价与加密技术界限计算方法——以鄂尔多斯盆地盘古梁长6油藏为例

目前中国低渗透油藏加密井及更新井产量在油藏总产量中占有重大比例,但同一井区内加密井生产效果差别巨大,亟需开展加密井单井评价及加密技术界限研究,指导低渗透油藏井网加密调整.分析盘古梁长6油藏历年投产加密井的实际生产动态数据,给出加密井生产动态模式划分标准以评价加密井单井开发效果.利用数值模拟方法定量研究了加密井网和加密时机对低渗透油藏加密效果的影响.结果 表明:加密井网井排距对加密效果影响最大,其次是加密井类型,最后是加密时机.利用油藏工程方法给出了低渗透油藏加密极限井距和加密时机的计算方法,对低渗透油藏井网加密调整具有指导意义.

Evaluation of Infill Wells and Calculation Method of Infilling Technology Standard in Low Permeability Reservoir:Taking the Panguliang Chang 6 Reservoir in the Ordos Basin as an Example

The production of infill wells and renewal wells account for a significant proportion of the total oil reservoir production in low-permeability reservoirs in China. However, the production profiles of infill wells in the same block varies greatly. It is urgent to carry out the research on evaluation of infill wells and infilling technology standard to guide the adjustment of infill well patterns in low-permeability reservoirs. Basing on the analyze of actual production performance data of the infill wells in Panguliang Chang 6 reservoir, the method of classifying production performance mode of the infill wells is proposed. Numerical simulation method is used to quantitatively study the influence of infilling well pattern and infilling timing on the infill wells production in low permeability reservoirs. It indicated that the well spacing of infill well pattern have the greatest impact on enhanced oil recovery of infill well production, followed by infill well types and infilling timing. Lastly, the calculation method of infilling limit well spacing and infilling timing of low-permeability reservoirs is given by using reservoir engineering method. This research is of guiding significance for the adjustment of well pattern in low permeability reservoirs.