Block Energy PLC encountered oil and gas during initial development of West Rustavi-Krtsanisi field (Project I), onshore Georgia, but encountered wellbore issues that may require changes to completion design.
Well WR-B01Za was drilled into the Middle Eocene reservoir, targeting lineations interpreted on the 3D seismic survey to represent productive sweet spots with high density of oil-bearing natural fractures, the company said in a release Feb. 28.
The well's planned trajectory consisted of a long horizontal reservoir section intersecting the fault-fracture system. Total depth (TD) was called at 2,372 m MD, instead of the intended 2,682 m MD, due to unstable wellbore conditions across a suspected fault at about 2,275 m MD which caused escalating tool failure and lost-in-hole risk. Significant drilling fluid losses and gas and oil shows were observed while drilling beyond the problem zone, indicating a potentially productive well, but currently constrained due to the wellbore failure.
Intermittent testing has produced some dry oil with zero water cut and high gas volumes, despite the wellbore issue. “Drilling data indicates a good reservoir containing oil with significant gas," said Paul Haywood, chief executive officer.
The well will now enter an extended well test period during which oil and gas will be sold while data is acquired to optimize the completion design, which may require further low-cost drilling operations to remedy or bypass the wellbore failure and improve overall wellbore connectivity to the productive zones.
Block Energy is reviewing data gathered during drilling and testing WR-B01Za to optimize the KRT-45ST drilling program, the second Project I development well.
