“The CLI was used on a coring job carried out by a major oilfield service company on behalf of the national oil company from one of the largest Middle Eastern oil-producing countries,” Coretrack said.

“The tool was used in an onshore well on a coring job carried out at a depth of 1975 metres at 77 degrees C.”

The CLI was used on two separate coring runs, the company said.

The first coring run was aborted 20m into the coring process due to a suspected core jam.

On retrieval of the coring assembly only a small portion of the core sample was recovered, but this was not a CLI-related issue, according to Coretrack.

“The CLI was recovered undamaged and it did not obstruct the coring process,” the company said.

On the second run, a full recovery of core was obtained.

“Again, the CLI was retrieved undamaged and it had not obstructed the coring process,” Coretrack said.

“Both the outer canister of the CLI and the electronics handled the hostile well environment without problems.

“Due to a minor soldering connection issue in the battery pack, the CLI unit did not record a complete set of data. The connection has been redesigned to avoid future recurrence.”

Coretrack said it was pleased with these first field test results, as both the CLI casing and electronics operated without sustaining any damage in the hostile well environment.

This test also confirmed the tool itself travelled freely within the inner core barrel without obstructing the core recovery process.