Pressure Tests for Drillpipe Development

Johannes Wischt

Research output: ThesisMaster's Thesis

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In order to meet future needs of the industry to drill more complex wells, with the necessity to place the well in the reservoir in the most optimum way, wired drillpipe, on the one hand and composite drillpipe on the other hand might be solutions meeting these demands. To further evaluate materials and verify constructive ideas, a pressure test, applicable to the different problems, was designed. While composite drillpipe has the advantage to be rather lightweight it also has the flexibility and strength which can be well adjusted in the design process. For example allowing to drill shorter radii or enhanced reach wells. Wired drillpipe has the advantage that it provides a larger bandwidth for data communication with downhole tools, which is a big advantage when thinking of logging while drilling or geosteering. Due to previous tests showing a leakage of composite pipe at a certain threshold pressure, the leakage behavior and breaking behavior of composite material, especially at increased temperatures, was examined in this work. While the leakage behavior could not be reproduced, the breaking behavior showed the interesting result that composite has a higher breaking pressure with increasing temperature. For examining these behaviors, a testing apparatus and testing procedure was designed. Furthermore, solutions for applying an armored pipe, protecting wires in a drillpipe, were evaluated. Hereby solutions for leading and sealing the armoring pipe through the tool joint of the drillpipe were tested with simplified tests. The tested lead-through solutions involved cutting rings, which are commonly used for hydraulic applications. Due to the different loading, two ways of using these cutting rings were evaluated. While both test setups showed no leakage, further tests will be necessary to fully evaluate the cutting rings under combined loads.
Translated title of the contributionDruckversuche für die Entwicklung von Bohrgestänge
Original languageEnglish
Awarding Institution
  • Montanuniversität
  • Thonhauser, Gerhard, Supervisor (internal)
Award date16 Dec 2011
Publication statusPublished - 2011

Bibliographical note

embargoed until 13-09-2016


  • Composite Drillpipe
  • Wired Drillpipe
  • Drillpipe
  • Pressure Test

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