Evaluating Formation Damage by Well Test Analysis

The big problem faces oil company when it produces from the well is a formation damage as a result of pore space of formation is blocked front of wellbore for flowing by drilling fluid invaded the formation while drill the well. Therefore it needs to remove the damage by acidizing operation and treat the invasion zone. Although the acidizing operation has disadvantage if the amount of acid that is pumped is higher than the required volume which leads to increase the formation damage instead of treatment. Therefore, it is important to determine the amount of acid required by known the distance of damage inside the formation which is define as the radius of skin damage, according this radius of formation damage will be easy to limit the volume of acid required to avoid more formation damage.Well test analysis is the method used to determine Formation damage for solve and treat the damage accordingly.