First case report with practically full AST implementation
The Aker BP drilling team had an ambitious goal for speed on Ivar Aasen. As a result, the Tomax downhole technology was brought in for qualification right from the appraisal phase.
Objectives
The ROP target for the campaign was as fast as 100 m/hr through the overburden. The target was set to save rig time and to minimize open-hole exposure. The latter is known to provide the best possible reliability in casing and cementing operations. The objective was to use the autonomous response of the AST tool to safeguard against vibrations when entering and departing stringers at fast speeds.
FACTS
Tool
9 ½, 8 ¼ and 6 ¾ XC-AST
Client
Aker BP
Country
Norway
Rig
Maersk Interceptor
Section
16, 12 ¼ and 8 1/2”
BHA
Schlumberger RSS
Time of report
January 2017
Results
The tool showed clear, universal advantages: faster ROP was achieved with less input energy. This meant maximized speed with low risk from vibrations. No failures were encountered with the drill-string or the borehole.
Value
In October 2016, the Norwegian Petroleum Directorate (NPD) formally acknowledged the drilling savings on Ivar Aasen. The production was approved to start on time and on budget.
