ملخص
Abstract
Formation damage caused by inappropriate drilling, completion, work over and production schemes are a major cost to the oil and gas industry worldwide. Many potential pay zones have been misdiagnosed as nonproductive and payout on investment has often been delayed. The reservoir rock and resident fluids are essentially in a state of physicochemical and thermodynamic equilibrium. Disruptions in this equilibrium due to changes in pressure, temperature and fluid chemistry around the well bore region can create barriers to flow and yield lower production rates.Scale deposition is one of the most serious oil field problems primarily when two incompatible waters are involved .Two water types are called incompatible if they interact chemically and precipitate minerals when mixed .Typical examples are sea water, with high concentration of ,and formation water, with high concentration of ,and .Mixing of these types of water could cause CaSO4,BaSO4,and SrSO4 scales.In this research we analyzed pressure transient for different oil wells in Amal Field. The collected data as well as reservoir rock and fluids properties and well bore conditions and configuration was being inserted into MINITAB program to formulate mathematical model which can predict total skin in oil wells .We observed that model gives good results when we compared St calculated from build up test with St calculated from the model. A Mathematical Model was developed in this study which can be used by the production engineer in any sandstone reservoir in order to predict the possibility of damage forming in the well.The model can also be utilized to define the parameters causing the damage in the well from which adjustment can be made to reduce the chance of forming damage in the well bore.