in wellbore representation 79 the third elastomer sealing unit 85 has been launched and pumped down the wellbore until just above the elastomer sealing unit 84 pumping continues and in wellbore representation 80 the three elastomer sealing units 83 84 amp 85 have connected and are jointly being pushed forward within the wellbore until the top of unit 85 clears the top of the perforations the pressure moving the units forward leaks off and forward moment of the elastomer sealing units ceases in wellbore representation 81 the forth elastomer sealing unit 86 has been launched and pumped down the wellbore until just above the elastomer sealing unit 85 in wellbore representation 82 the four elastomer sealing units 83 84 85 amp 86 are connected and are jointly being pushed forward within the wellbore until the top of unit 86 clears the top of the perforations the pressure moving the units forward leaks off and forward moment of the elastomer sealing units ceases the sealing plugs can now be left to expand and seal the wellbore across perforations where they are located now cement spacer can be pumped downhole followed by a lead wiper plug cement and a tail wiper plug the forward progress of the wiper plugs and cement will cease when the lead wiper plug lands out on the last elastomer sealing plug unit 86 sealing off the perforations the wellbore is now sealed with elastomer sealing plugs across the perforations and a cement plug across from the well cemented casing annulus above the completion fig1 provides progressive time shots of the same wellbore are denoted by 88 89 90 91 92 93.