TY - THES

T1 - Pressure Tests for Drillpipe Development

AU - Wischt, Johannes

N1 - embargoed until 13-09-2016

PY - 2011

Y1 - 2011

N2 - 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.

AB - 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.

KW - Composite Drillpipe

KW - Wired Drillpipe

KW - Drillpipe

KW - Pressure Test

KW - Bohrgestänge aus Verbundmaterialien

KW - Verkabeltes Bohrgestänge

KW - Drucktest

KW - Druckversuch

KW - Druck

M3 - Master's Thesis

ER -