The campaign needed extensive under-reaming and caused concerns over vibrations and long bit trips.
Objective
The group of partnering operators went diligently through all available methods for vibration mitigation when planning a deep exploration project in the Nile Delta. Real-time dynamics, shock recorders and absorbers were all brought in for evaluation. This evaluation also included the Tomax XC-AST.
FACTS
Tool
9 ½, 8 ¼ and 6 3/4” XC-AST
Client
Total
Country
Egypt
Rig
EDC 56
Section
19 1/8 x 22,16½, 12 ¼ x 14¼,10 5/8 x12¼ and 8 1/2”
BHA
Pendulum first and last section. Else RSS. All PDC. UR in three of the sections (left)
July 2017
Results
The Tomax tool was tested by overlap in a particularly challenging section. Based on the test results, Total put the bet on Tomax and ordered tools to the well site for five consecutive sections. One dimension was left for contingency. Three of the sections included under-reamer:
Value
At TD, an impressive record of efficiency was revealed: The Total team had drilled four of the five sections in one bit run. Only the longest section needed an extra bit. Total had proven it was possible to mitigate the risk from vibration through a large variety of sediments.
