摘要
目前关于生产数据分析方法的研究主要集中于连续孔隙型砂岩油气藏。由于缝洞型油藏非均质性强，非连续特征明显，常规生产数据分析方法理论对其适用性较差。文中考虑了缝洞型油藏离散缝洞介质特征，并基于等势体溶洞模型思想，建立了缝洞型油藏井￣缝￣洞组合的生产数据分析模型，通过拉普拉斯变换求解得到归一化系数及井底压力解，并绘制得到了缝洞型油藏生产数据分析模型典型图版。结果表明：溶洞体积及储容能力的增大会减小规整化产量，使得规整化产量积分导数曲线下凹特征更明显；裂缝长度及横截面积的增加会增大规整化产量，使得曲线向上抬升。结合现场实测井的静动态资料，应用井￣缝￣洞模型进行计算分析发现，所建立的模型能够达到较好的图版拟合效果及压力历史拟合效果，验证了模型的可靠性，为缝洞型油藏日常生产数据利用、储层结构分析及储量评价提供了一种较为可靠的计算方法。
Abstract
At present, the research on production data analysis methods is mainly focused on continuous porous sandstone oil and gas reservoirs. Fractured vuggy reservoirs have strong heterogeneity and obvious discontinuous characteristics., so the theoretical applicability of conventional production data analysis methods is poor. Therefore, considering the characteristics of discrete fractured vuggy medium in fractured vuggy reservoirs, based on the idea of equipotential karst cave model, the production data analysis model of wellbore-fracture-cave combination in fractured vuggy reservoir is established. The normalization coefficient and bottom hole pressure solution are obtained by Laplace transform, and the typical chart of production data analysis model in fractured vuggy reservoir is drawn. The results show that the normalized production decreases with the increase of cave volume and cave storage capacity, and the concave characteristic of normalized production integral derivative curve is more obvious. The increase of crack length and cross-sectional area will increase normalized production and lift the curve upward. Combined with the static and dynamic data of field measured wells, the wellbore-fracture-cave model is applied for calculation and analysis. The established model can achieve good chart fitting effect and pressure history fitting effect, verify the reliability of the model, and provide a reliable calculation method for daily production data utilization, reservoir structure analysis and reserve evaluation of fractured vuggy reservoir.
论文详情