关键词: 蚓孔, 径向, 等效渗透率, 基质酸化, 产能, 模型

Abstract:

We studied the wormhole effect on the well productivity which conventional well productivity model of matrix
acidizing in carbonate reservoir did not take into consideration. On the basis of the wormhole growth model in radial geometry
and the equivalent permeability model，this paper established a new well productivity model considering wormhole. Based on
the laboratory experiment data of carbonate core displacement by 15% HCl，we selected the optimal acid injection velocity and
the optimal pore volume to breakthrough，and calculated the effective dominant wormhole length and diameter and equivalent
permeability in post-stimulation area near wellbore. Then we calculated the well productivity，and compared it with the real
productivity，and the result shows that when considering the wormhole，the new model is accurate and reliable. This research
presents a new method to predict the well productivity for matrix acidizing in carbonate reservoir.

Key words: wormhole, radial geometry, equivalent permeability, matrix acidizing, well productivity, model