Torgeir Torkildsen
Statoil
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Featured researches published by Torgeir Torkildsen.
Distributed Computing | 2007
Roger Ekseth; Torgeir Torkildsen; Andrew G. Brooks; John Lionel Weston; Erik Nyrnes; Henry Ferguson Wilson; Kazimir Kovalenko
□ Although a second independent survey cannot separately identify all potential errors, it is still the most powerful external data QC check. □ Statistical tests are used to ensure that directional survey measurements have an accuracy that is compatible with the applied error model. Internal QC checks, which are based only on single-source downhole data, are not sufficient to fully validate a survey against its error model (see SPE 103734). – John Weston, SPE – Roger Ekseth, SPE – Kazimir Kovalenko, SPE
SPE Annual Technical Conference and Exhibition | 2000
Torgeir Torkildsen; Jon Bang
We present a novel method for analysing the position uncertainty of directional surveys. By this method, the uncertainty can be accurately calculated by conceptually simple analytical formulae. The theory covers any correlation in measurement error and any correlation in toolface, for both stationary and continuous surveys. The results demonstrate the importance of handling the toolface dependence properly. A direct benefit is that too optimistic or overly pessimistic accuracy estimates are avoided. Furthermore, the difference between rotating and sliding operation is significant for many error terms. For example, a misalignment error typically causes 10 times higher position uncertainty in sliding mode than in rotating mode, for a 3000 m long survey. These findings should have implications for the future specification of survey instrument operation procedures, and thus the design of directional survey programs.
Spe Drilling & Completion | 2010
Roger Ekseth; Torgeir Torkildsen; Andrew G. Brooks; John Lionel Weston; Erik Nyrnes; Henry Ferguson Wilson; Kazimir Kovalenko
Distributed Computing | 2004
Torgeir Torkildsen; Inge Edvardsen; Arild Fjogstad; Arild Saasen; Per Amund Amundsen; Tor Henry Omland
Archive | 2002
Torgeir Torkildsen
Archive | 2010
Jon Bang; Torgeir Torkildsen
SPE Indian Oil and Gas Technical Conference and Exhibition | 2008
Per Amund Amundsen; Songxiong Ding; Biplab K. Datta; Torgeir Torkildsen; Arild Saasen
Journal of Energy Resources Technology-transactions of The Asme | 2006
Per Amund Amundsen; Torgeir Torkildsen; Arild Saasen
Middle East Drilling Technology Conference & Exhibition | 2009
Erik Nyrnes; Torgeir Torkildsen; Harry Wilson
Spe Drilling & Completion | 2012
Tor Inge Waag; Torgeir Torkildsen; Per Amund Amundsen; Erik Nyrnes; Arild Saasen