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酸化压裂是碳酸盐岩油气藏提高单井产量的常用增产工艺措施之一酸压裂缝的裂缝长度和导流能力则是评价酸化施工有效性的两个主要指标。在酸化后理解缝表面粗糙程度和酸化后裂缝岩石强度和基础上，提出了新的估算七预测本能压裂导汉的理论模型。模拟的建立主要分三步：首先，用裂缝面凸凹度分布曲线的峭度表征裂缝表面粗糙度，并将凸凹度分布换算成接触面积；其次，根据接触面积和裂缝面岩石强度计算适 闭合应力之下的闭全程度，由于

A NEW MODEL FOR ESTIMATING ACID FRACTURE CONDUCTIVITY

Acid fracturing is one of the common stimulation methods used for enhancing the single well productivity of carbonate reservoirs.The length and conductivity of the acid fracture are the principal indices for evaluating the effectiveness of acid fracturing treatment.On the basis of the roughness and rock strength on the fracture surface after acidization,a new theoretical model for estimating or predicting the acid fracture conductivity is proposed in the paper.The model is developed in three steps:the first,the kurtosis of the asperity distribution curve of fracture surface is used for characterizing the surface roughness and converting the asperity distribution into the contact area;the second,the fracture closure under closure stress is calculated according to the contact area and the rock strength on the fracture surface,and the damage of the rock strength by acid etching is also considered in the meanwhile;and the third,the fracture conductivity is calculated by use of the wellknown cubic law.By comparison with a serie of the experimental results of the acid fracture conductivity,the conductivities under various closure stresses are accurately culculated by use of the model through adopting the actually measured parameters.In comparison to the common NierodeKruk correlation in which the actually measured parameters were also used,the theoretical model shows a tremendous improvement on the accuracy of estimating the acid fracture productivity.The new model is simple and easy to be used,by which the basis and convenience can be provided for the mathematical simulation of acid fracturing reservoirs.