Abstract

Formation damage is indeed the reduction of the permeability of reservoir rock which is the path that the hydrocarbon will be produced of it. Production rate has a direct relationship with permeability. Therefore, any reduction in permeability will reduce the production rate. The most important factor which will damage the productive formation during the drilling of different types of wells such as development, descriptive, exploratory, repair, and operational shortcoming wells is severe lost circulation. A full understanding of the mechanisms of formation damage, detailed measurements, and its prevention and effective treatments are keys to optimal strategies of production in oil and gas fields. In this study, tried for physical and chemical damage to the formation due to drilling fluid loss during drilling operations was investigated. Studies in this field were reviewed and their results were significantly increased and the main mechanisms associated with damage to oil reservoirs were investigated. The results of this study showed that special drilling fluids NIF, and MMH with high control of loss are the most important material to prevent damage to the formation. Also, the results of studies showed that these Lost Circulation Materials (LCM) have a special chemical structure that has high compatibility with the formation. This material is generally fibrous, which will efficiently bridge over and seal loss zones. Another result of this study is that the removal of these anti-loss materials is very easy and the permeability recovery of the formation is very high in them

Keywords:Formation damage; Lost circulation materials; Special fluids MMH-NIF; Permeability recovery