12.01.02 CTP Plans Flow Test Surprise-1 Re-entry H
Sydney, Jan 3, 2012 AEST (ABN Newswire) - Central Petroleum Limited (
ASX:CTP) advises shareholders that flow testing of the well is planned to commence late this week.
A Measured Depth of approximately 2,854m with a True Vertical Depth of approximately 2,534m has been reached with approximately 230m of horizontal drilling in the target reservoir. Tight hole conditions have developed in the angle build section of the wellbore and consequently further drilling has been discontinued to safeguard the well integrity. It is planned to run a sleeve of 2.875" production tubing through this section to counter sloughing claystones and siltstones of the Middle Stairway Sandstone Member before testing commences. This will prevent any problems during testing and possible subsequent production.
Throughout the horizontal drilling, some dip changes were encountered but the drill bit remained in sandstone with continuous oil shows and during only approximately 10m of horizontal drilling were oil shows rated at less than good to excellent. 100% dull to bright yellow fluorescence and instant blue/white cut fluorescence were commonly recorded. ie c.230m of measured depth horizontal drilling was completed with a cumulative total of c.230m of continuous oil shows, c.220m of which were rated at good to excellent and c.10m of which were rated at poor to fair.
A drill break was evident at 2,676m Measure Depth. On circulation to the surface, black oil was evident on the shale shakers and a gas peak of 1,167 units was recorded with C1/C2/C3/iC4/nC4/iC5/nC5 percentages of 2/4/24/12/30/14/14 % respectively. Similar "heavy gas" dominated recordings were evident throughout drilling and circulation averaging in excess of 30-50 units with occasionally much higher peaks.
A continuous stream of oil on the surface of the possum belly 2-3cm wide was observed on occasion together with drilling fluid (brine) discoloured pale brown over shakers since the report released on 28 December 2011. Most of the time during drilling and circulation, free oil droplets were observed in the drilling fluid; on occasion covering approximately 60% of the surface of samples taken.
Further updates will be provided when any significant information becomes available.
Any results or conclusions reported are based on preliminary data analysis and may be subject to change as more data becomes available. Nothing in this report represents or should be construed to represent any conclusions as to the flow capability of the well. Such conclusions must await actual flow testing.
About Central Petroleum Limited
Central Petroleum Limited (
ASX:CTP) is an established ASX-listed Australian oil and gas producer (ASX:CTP) with exploration and appraisal permits in the Northern Territory (NT). Central has grown to become the largest onshore gas operator in the NT, supplying residential and industrial customers in the NT and wider Australian east coast market.
Central is seeking to become a major domestic energy supplier, in addition to helium and naturally occurring hydrogen, with exploration, appraisal and development plans across 169,112 km2 of tenements the NT, including some of Australia's largest known onshore conventional gas prospects in the Amadeus Basin.
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