渤海油田某奥陶系潜山碳酸盐岩油藏酸化后试井曲线特征分析

Analysis of Well Test Curve Characteristics of Ordovician Buried Carbonate Reservoir After Acidizing in Bohai Oilfield

海上某油田奥陶系潜山油藏属于特低渗碳酸盐岩油藏,储层物性差。经DST测试,酸化前无产量,酸化后日产油量达100 m3左右,且产油量稳定,试井曲线表现出垂直裂缝压裂井典型的"线性流"特征。通过酸化作业,有效地沟通了储层中的天然孔隙和裂缝,建立了高导流能力的渗流通道,使油井产能大幅提高。酸化作业是此类特低渗碳酸盐岩油藏开发的有效增产措施,值得在油田未来开发中全面推广。

The reservoir properties are poor in an Ordovician buried carbonate reservoir with ultra-low permeability in an offshore oilfield.Tested by DST,there is no productivity before acidizing,while the oil production after acidification reaches about 100 m^3/d and the oil production is stable.The well test curve shows the typical"linear flow"characteristics of vertical fracture fracturing wells.The analysis shows that the acidizing operation effectively communicates natural pores and fractures,and establishes percolation channels with high conductivity,which greatly improves the productivity of oil wells.It shows that acidizing operation is a very effective stimulation measure for this kind of ultra-low permeability carbonate reservoir,and it is worth popularizing and applying in the future development of oilfields.