26 it is only necessary that the reperforation occur in generally the same area as the original perforation 26 ideally the reperforation should be located generally about the middle of the production interval 12 after the production casing 18 has been perforated in the manner illustrated in fig1 the reservoir fluids 30 are free to enter the small perforated interval 26 the fluid entering the casing 18 will have a horizontal permeability factor and a vertical permeability factor this is because the reservoir fluid 30 will be entering the casing from a variety of different directions the reservoir fluid flow 30 will enter the interior 28 of production casing 18 and displace any completion fluids which are contained within the casing 18 the pressure gage 22 and equipment at the surface of the well can be used to establish reservoir fluid flow for the purposes of the present invention it is important to measure the reservoir fluid flow through this initial perforation 26 in the production casing 18 if the reservoir 10 is capable of flowing then a flow test is carried out followed by a build up test with bottomhole pressure measurements carried out by pressure gage 22 however if the reservoir is not capable of producing on its own then a suitable downhole pump is installed the downhole pump will pump the fluids from the production casing 18 for a reasonable time the well will then be 34 shut in 34 so.