CTP 2.04% 5.0¢ central petroleum limited

surprise drill rig unsuitable for lower target

  1. 11,084 Posts.
    There has been discussion about the suitability/unsuitability for the drill rig used for Surprise.

    In Dalton's interview today, he stated this;

    " So we drilled down to the maximum depth that our particular rig could handle, leaving our lower
    horizon targets for a later date.
    We then pulled back up and did our horizontal sidetrack. "

    From CTP's 2011 Annual Report, it states;

    " Surprise-1 is a highly significant well and worthy of special mention, having exhibited strong oil shows while
    drilling the Stairway sandstone, in which a 9 m core was successfully cut and retrieved. The base of this core was
    still in sandstone with almost 100% hydrocarbon fluorescence and to visual inspection contained abundant oil.
    Laboratory measurements determined a peak permeability of between 400 and 500 mD. If sufficient oil saturation
    is present, and this remains to be confirmed, independent calculations suggest a production capability in the
    vicinity of 1,000 barrels per day. It was during an attempt to establish a free oil flow from this interval when the rig
    incident occurred and the well was suspended.

    The underlying Horn Valley siltstone (source rock and possible
    unconventional reservoir) and the Pacoota sandstone (the primary objective), remain to be tested. "

    ....Notice that it says here;

    ..... "The underlying Horn Valley siltstone (source rock and possible
    unconventional reservoir) and the Pacoota sandstone (the primary objective), remain to be tested. "

    If you have a look at the Surprise Daily Drilling Updates, it shows the bottom of the drilled hole in the Lower Stairway Sandstone, .... Which is ABOVE The Pacoota Sandstone, ..... indicating from DH's words, that the drill was not suitable for reaching the PRIMARY target in the Pacoota Sandstone.

    .... This drill rig was acquired in haste by JH/the board as from memory the original rig that was to be used was busy elsewhere.

    From a phone call I had with JH, he did appear to favour continuing drilling,(being a Geo, would he know as much about drilling as DH ?, .... but from DH's statement today, saying that they drilled down to maximum depth that their rig could handle, ..... it appears that DH must have had major influence on decision not to continue drilling.

    RAVI

 
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