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Unformatted text preview: ratio. This equation is an analytical result for the following flow system. The pressure drop through the system is shown as a series: 141.2 141.2 141.2 ln ln ln simplifying and solvin for ln 1 o o o e o o o e o o o s dp p w s s w dp s dp p w s s q B r q B r q B r s s kh r kh r k h r s r k k s s r k k + = + + =-+ w r s r e r k s k (b) This is a semi-analytical result for combined mechanical and perforating skin where the perforations do penetrate beyond the damage radius. The effective length of the perforation and the effective well bore radius used to model the perforating skin are adjusted to show the effect of the altered permeability on flow into the perforation through the damaged radius. s s w w s s perf perf p dp r k k r r r k k l l s s ) 1 ( ) 1 ( using evaluated is ) s ( skin n perforatio the p-+ = --= =...
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- Spring '08