Overview

An operator in the Ivory Coast had an ongoing development drilling program, with 17 1/2” hole sections ranging
2200ft – 4900ft in length, with hole angle building from 20 degrees up to horizontal. The wells were drilled and
completed horizontally with a 2700ft – 3300ft 12 ¼” hole reservoir section.

Challenge

Previous drilling challenges included hole cleaning problems and running casing due to the build section and high
hole angle in the 17 ½” section.

Solution

In addition to adopting improved ERD drilling practices, Rebel® subs were to be introduced to provide
additional mechanical agitation of the cutting beds while drilling.

Result

• The Rebel® subs were custom designed and
  built to order, supplying both 6 5/8” and 5 7/8” tool sizes.
• A total of 25 tools were manufactured in a very short timescale, providing an excellent service to the
  client, matched with a competitive and efficient pricing structure for long-term rental requirements.
• The Rebel® subs were utilised for the
  remainder of the development project, 4 wells in total, in both 17 ½” and 12 ¼” hole sections.
• The Rebel® subs proved to be extremely
  durable and cost effective with no additional “surprise” redress or DBR charges.
• The total footage culminated at 21,510 feet.