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泵抽式电缆地层测试是在油气资源评价中快速获得储层的渗透率的技术手段。目前对泵抽式电缆地层测试压力资料分析多采用球形流分析法,而对于大排量泵抽式电缆地层测试器,在薄储层和储层的上下边界,测试流动形态则会从球形流过渡为柱形流,如果仍然采用球形流动解释方法,就会给解释结果带来较大的误差。通过分析泵抽式电缆地层测试储层流动形态,并应用油气层渗流力学理论,推导出了在球形流与柱形流复合流动形态下的渗透率求解模型。选择某油田一口井的电缆地层测试资料为例对该模型进行验证。由于测试目的层为层薄,渗流为球形流与柱形流复合流动形态,采用模型计算得到储层渗透率为46.6×10-3μm2,与该层段取心分析岩心渗透率(56×10-3μm2)接近,证明该渗透率求解模型可行。
Pumping cable formation testing is a rapid means of obtaining reservoir permeability in the evaluation of oil and gas resources. At present, the ball flow analysis method is mostly used for the analysis of the pressure data of the pumping pumping stratum. However, for the large displacement pumping cable formation tester, on the upper and lower boundaries of thin reservoirs and reservoirs, the test flow pattern changes from the spherical flow The transition to a cylindrical flow, if still using spherical flow interpretation method, it will give the interpretation of the results with greater error. Based on the analysis of reservoir flow patterns in pumping cable formation and the application of reservoir seepage mechanics theory, the permeability model of spherical flow and cylindrical flow is deduced. The model is verified by selecting the data of cable formation test in a well of a certain oilfield. Due to the thin layer of the test target and the seepage flow into the composite flow pattern of the spherical flow and the cylindrical flow, the permeability of the reservoir is 46.6 × 10-3μm2 calculated by the model. The core permeability of this layer is 56 × 10- 3μm2) close to prove that the permeability solution model is feasible.