Evaluation and Improvement of Well Stimulation by Matrix Acidizing in one of the Southern Iranian Oilfields

Well stimulation by means of acidizing has been extensively conducted for enhancing the productivity or injectability of producing and/or abandoned wells in southern Iranian oilfields, and matrix acidizing is considered as the major stimulation method in this region. Permeability improvement and consequently reaching a negative skin is the main objective of this type of stimulation. The aim of this research is to evaluate the performance of the carried out matrix acidizing and put forward some alternative methods to improve this kind of operation. The post production results of acidizing show an inefficient outcome of the majority of these operation in the investigated oilfield. The history of performed matrix acidizing operation in some of the southern Iranian oilfields in recent years has been introduced in this study. By employing Pansys software, the evaluation of pre and post stimulation jobs has been applied to nine wells. Also, Nodal analysis has been performed by Pipesim software in the investigated oil wells to study the production systems of these nine oil wells. By utilization of the results of this study and assessment the literature review of the related studies, matrix acidizing operation will be discussed in detail in this paper. The results show that among the nine oil wells studied in this research, wells 20, 22, and 38 are the best candidate for matrix acidizing operation. Finally because of the associated difficulties with matrix acidizing and in order to bypass various types of formation damage, the authors of this paper recommend Iranian upstream industry to considering Hydraulic Fracturing operation as a replacement stimulation method.