The primary Cretaceous limestone target was encountered at 4,277 metres (14,032 feet) measured depth (MD), some 70 metres MD higher than in this original M11 well. The M11Z well has been deviated to a location some 600 metres (0.37 miles) away from the original hole. Drilling data and slim hole wireline logs indicate the presence of hydrocarbons. The secondary Middle Eocene target zone (which is the main reservoir in the Ninotsminda and Samgori Fields) which was encountered at 3,965 metres (13,009 feet) MD, was also significantly higher than in the M11 well, and with a much thicker section, also with hydrocarbons being indicated from drilling data and slim hole wireline logs. The Middle Eocene and Cretaceous reservoirs appear to be part of the same pressure system.
The original production test on the Manavi M11 discovery well in 2003 was prematurely terminated due to the collapse of the production tubing due to pressure during testing. Prior to this, during the initial clean-up, good flow rates were observed from the well, although un-metered, with 34.4 degrees API oil being recovered. CanArgo believes that the M11 Cretaceous oil discovery has potential to be one of the most significant oil discoveries made recently in the Southern Caucasus. Over 150 metres (490 feet) of hydrocarbon bearing Cretaceous limestone reservoir was encountered, with the top at 4,348 metres (14,265 feet).
At M11Z, the small hole size has prevented the running of a normal open hole log suite to ascertain reservoir characteristics and hydrocarbon saturations. Nonetheless a Pulsed Neutron Neutron log suite has been run which indicates the presence of hydrocarbons. However these data require confirmation from the planned flow test. Currently a pre-perforated 2 7/8 inch (73 mm) liner is being prepared for the test. Testing is expected to commence during September once the rig is demobilised and testing equipment installed.
The Saipem Ideco E-2100Az drilling rig (equipped with a top-drive
drilling system and using a Baker-Hughes oil-based mud system) is now
being mobilised to the MK72 Norio exploration well. The UralMash Rig
which has been drilling this well has had difficulty drilling through
a highly over-pressured section of swelling clays above the prognosed
target zone and the Saipem Rig with its oil-based mud system has
successfully drilled through a similar section in the M11Z well. It
is planned to use the Saipem rig to drill to the prognosed target
zone, which should take approximately one month from when drilling
commences in late September. Given success it would be planned to run
5 inch (127 mm) casing at the top of the target zone and then move
the Saipem rig to commence drilling of the Manavi M12 appraisal well
(the second appraisal well on the Manavi discovery), using the
UralMash rig with Baker-Hughes slim hole drilling equipment to
complete the MK72 well.
In Kazakhstan, CanArgo currently owns interests in the proven Kyzyloy Gas Field, and in large exploration areas in the western part of the country close to the Aral Sea.
The first of the five exploration wells (AKK103) planned on the
Akkulkovsky area has reached TD and wireline logs indicate the
presence of gas bearing sands in the well. Casing has been run and
the well suspended for a planned production test in late September,
as part of a broader testing program including wells on the Kyzyloy
Field. The rig is now being moved to the next location (AKK105), and
it is planned to mobilise a second drilling rig to accelerate the
exploration / appraisal program.
CanArgo is an independent oil and gas exploration and production company with its oil and gas operations currently located in the Republic of Georgia and the Caspian area.
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