储层伤害试井评价新方法研究

针对传统储层伤害试井评价的污染带渗透率求取存在较大偏差，进而影响表皮系数准确分解的问题，建立了改进的麦金利图版试井分析新模型，利用拉普拉斯变换进行了求解，并编程绘制了新的分析理论图版（改进的麦金利图版），获得了新的拟合解释方法，可以非常准确地求取污染带渗透率。再利用Hawkins 公式，优化计算真表皮系数和污染半径，从而利用污染带渗透率、污染半径和真表皮系数进行储层伤害试井评价。最后，进行了实例分析，结果符合现场实际，为改善储层、采取措施提供了依据。

Research on A New Method of Well Testing Analysis for Formation Damage Evaluation

A reasonable and precise formation damage evaluation is of great significance in guiding the development of oil and gas reservoir. The conventional method for formation damage evaluation mainly depends on skin factor and the McKinley type curves match,by which the permeability of the damaged zone can be calculated. However,because of the solution ambiguity of the McKinley match,this method may result in great deviation,which further influences the accuracy of decomposition of skin factor. A new model of modified McKinley well testing analysis method is established,and then its solution is got by the Laplace transformation. Moreover,the new theoretical type curves(the modified McKinley type curves)are drawn up by programming. Eventually a new analysis method of matching that can precisely calculate the permeability of damaged zone is obtained. Hawkins formula is used to calculate true shin factor and the damaged radius,and on the basis of we evaluate formation damage of well testing permeability of the damaged zone,true shin factor and the damaged radius. Finally the cases of real oil wells are illustrated and the results accord with the fact,which can be references to formation improvements and measures taking.