Block Energy plc will start an extended well test for the first well in Project I caused by unstable wellbore conditions at the West Rustavi / Krtsanisi oil field in Georgia.
WELLBORE FAILURE
The company drilled the WR-B01Za well into the Middle Eocene reservoir, targeting productive “sweet spots” with high density oil-bearing natural fractures, based on 3D seismic survey.
The planned trajectory consisted of a long horizontal reservoir section intersecting the fault / fracture system.
Drilling stopped at total depth of 2,372m MD, instead of the intended 2,682m MD because of unstable wellbore conditions across a suspected fault at approximately 2,275m MD which caused “escalating tool failure and lost-in-hole risk”.
INITIAL RESULTS
“Intermittent testing has produced some dry oil with zero water cut and high gas volumes, despite the wellbore issue,” said Block in a statement.
During the extended well test period, the company will sell oil and gas as well as obtain data to optimise the KRT-45_ST drilling programme, the second Project I development well.
This may need further “low-cost” drilling to remedy or by-pass the wellbore failure and improve overall wellbore connectivity to the productive zones.
CHALLENGES
“The drilling and geoscience teams have done an excellent job completing this well, given the challenges experienced while drilling the horizontal section,” added chief executive Paul Haywood.
“Drilling data indicates a good reservoir containing oil with significant gas.”
Block continues to work on Projects II, III and IV.