Dynamic Load Evaluation of Large Dimensioned Casing Strings at Primary Cementing

Volker Jedlitschka

Research output: ThesisMaster's Thesis

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In this thesis a plug cementation of a 16" casing string is investigated. What happened was that during primary cementing of a 16" casing string at a depth of 2440 m, the string failed. It was assumed that the bottom plug plugged the float valve and thus the cement column was immediately stopped on its way downhole (water hammer phenomenon). Task was to investigated if this water hammer effect causes a suffiecent high load to damage the casing string. It could be figured out that the string faced a maximum load of 61,53 bar but out of this only 11,3 bar were generated by the water hammer. The remaining 50,3 bar were caused due to the hydrostatc difference between the annulus and the casing. Further it could be proved that larger casing sizes do not increase the impact of a water hammer. Concerning pipe dimensions the ratio between wall thickness and inner diameter is decisive. The whole study is supported with a simulation software called Wanda 3.
Translated title of the contributionDynamische Belastung großdimensionierter Verrohrungen beim Zementieren
Original languageEnglish
  • Thonhauser, Gerhard, Supervisor (internal)
  • Doschek, Markus, Co-Supervisor (external), External person
Award date30 Mar 2007
Publication statusPublished - 2007

Bibliographical note

embargoed until null


  • water hammer
  • plug cementation
  • float collar
  • plug
  • joukowsky
  • budau
  • free falling cement
  • elastic liquid column
  • bulk modulus
  • pressure wave
  • transients
  • pressure puls
  • cavitation pressure
  • speed of sound
  • reflection time
  • opicem
  • wanda
  • fluent

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