div class=trans-pagebuttonPage 1button div class=trans-image a href=https:reader040fdocumentsinreader040viewer20220225145af5b0a77f8b9a8d1c8deff3html5page1jpg target=_blank amp-img class=trans-thumb alt=Page 1: PF4 trifold FINAL - PetroSkills John M Campbell€” DarcyS equation for radial flow through porous media — Effect of facilities-imposed back pressure on well productionrates src=https:reader040fdocumentsinreader040viewer20220225145af5b0a77f8b9a8d1c8deff3html5thumbnails1jpg width=142 height=106 layout=responsive amp-imga divdiv