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Precision Drilling Corporation Message Board

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  • manboking manboking Apr 23, 1999 8:12 AM Flag

    Trend Positive now

    On April 4th. while on "vacation", encountered a
    sand storm west of Midland, texas, all the way thru
    New Mexico, that evening after arriving at Tucson,
    Arizona in shorts and short sleeve shirt felt confident I
    had beat the elemnts. Wrong again, next day it snowed
    in Tucson. Moral of the story even the best plans go
    wrong.
    ==========
    This story lead me in to your question: "what is
    under-balanced drilling?".
    ==========
    In conventional
    drilling you conventional hardware and a mud system
    designed
    "to avoid well blow
    outs".
    ==========================
    In underbalanced drilling
    "a rotating blow-out
    preventor, and
    "a special particle separator" are used,

    "in planning ahead for a bow out to take
    place".
    ================================================
    Thus minimizing formation
    damage.
    =================================
    Conventional methods specially in matured areas where
    formation pressures are low due to depletion, formation
    damage can be quite extensive. Often fractures are
    filled with mud, and clays swellings cuts down on the
    potential productivity of the well, and needs further
    chemical treatments (acids, inhibitors, etc.) to try to
    clean the damage caused by the drilling system, also
    often fracturing of the reservoir is needed to re-open
    the formation and more work-over-cost are incurred to
    the well operator.
    Hope this over simplified
    explanation helps...!

 
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