treatments determine the optimized time to drop a diverter evaluate the efficiency of a diverter estimate the damage radius reservoir height and formation permeability as well as determining the character of water injection wells fig7 is a flow chart of the an example field procedure for real time process time control of well stimulation first a step rate test is performed as described above in connection with fig3 once the initial skin factor is determined it is reviewed by the operator to determine whether or not it is reasonable for the well in question this review is based on historical information about that well or other information available to the operator if it is determined not to be reasonable the job is stopped and must be re engineered if however the initial skin factor is determined to be reasonable then a matrix acidizing treatment might be performed during the conduct of the matrix acidizing treatment skin factor is continuously determined using computer 18 and the software described above if the skin factor is not decreasing at the beginning of the treatment then the job should be stopped immediately and a different matrix acidizing treatment should be developed if the skin factor begins decreasing the job should be continued until the skin factor levels off once the skin factor levels off it must be determined as to whether or.