I am studying for an exam and I desperately need information on placement issues and pumpability in oil and gas cementing. Thanks in advance
You okorder ). Most of the published information has to be purchased through the Society of Petroleum engineers. Off the top of my head, some of the issues are being able to pump a heavy viscous fluid like cement across under pressured formations. You have to apply enough pressure to move the cement, but you have to stay below the fracture pressure of the rock formations. If you don't, the formation will break down and the cement will flow in to that zone, called a thief zone, and cement will not make it all the way up the casing. The other issue is keeping casing centralized in the wellbore so that cement will be placed evenly around the casing. If the casing is not centered, then the cement may not might not completely encase the casing, leaving void spaces where channels can form, where oil and gas could flow.
