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A Directional Drilling BHA Presentation Sonatrach

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    Directional Drilling

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    Fs

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    Sliding

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    Bit Displacement

    Lateral distance from the BHA

    the bit center

    BD = Lt x sin

    where : Lt (in) length from b

    () bend angle

    _________________________

    Example :

    9 5/8 Sperry-Drill, 6/

    Lm = 32.14 ft

    Lt = 32.14 + 1.0 = 33 = 1.5

    BD = 397.68 x sin 1.5

    BD

    Lt

    Bent sub

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    Bit Interference - examp

    Bi = BD + 0.5(DM +DB)-DH= 10.41 + 0.5(9.625 + 1= 9.098 in

    BD

    = 10.41 (in) bit displacem

    Dm = 9.625 (in) OD of the mo

    Db = 12.25 (in) bit size

    Dh = 12.25 (in) hole size

    Dm

    Db

    Dh

    Bi

    BD

    Bent sub

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    Bit Displacement

    Lateral distance from the moto

    the bit center

    BD = Lt x sin

    where : Lt (in) length from b

    () bend angle

    __________________________

    Example :

    9 5/8 Sperry-Drill, 6/7

    Lt

    = 129.4

    = 1.5

    BD = 129.4 x sin 1.5 = 3BD

    LtABH

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    Dm

    Db

    Dh

    Bi

    Distance the bit would displace b

    of the wellbore if not constrained

    Bit Interference

    Bi = BD + 0.5(DM +DB)-DH

    where : BD (in) bit displacem

    DM (in) OD of the mo

    DB (in) bit size

    DH (in) hole size

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    Dm

    Db

    Dh

    Bi

    Bit Interference - example

    Bi = BD + 0.5(DM +DB)-DH= 3.39 + 0.5(9.625 + 12.25) -

    = 2.077 in

    BD = 3.39 (in) bit displaceDM = 9.625 (in) OD of the m

    DB = 12.25 (in) bit size

    DH = 12.25 (in) hole size

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    Kick-off / SidetraKick-off / Sidetrac

    Interference created side forces p

    bit to the side and cause sidetrac

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    Sidetracking from Cem

    Time drilling : 4-5 in/hr progres

    low WOB

    monitor cement

    CMT Plug

    50% ce

    50% for

    100% ce

    100% side force

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    Effect of Bent Housing AngEffect of Bent Housing Angon Build Rates and Bit Side-lon Build Rates and Bit Side-l

    Straight Hole

    Ho

    BendAngle

    ()

    0.5

    0.75

    1

    1.251.5

    35 ft

    0

    2000

    4000

    6000

    8000

    10,000

    12,000

    14,000

    16,000

    18,000

    20,000

    0.5 0.75 1 1.25 1.5Bent Housing Angle, deg

    Bit Side-Load

    Bit Side-LoadRotating inCurved Hole

    BitSide-Loa

    d,

    lb

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    Theoretical DLS

    DLS ====

    R

    Bend angle

    Bit

    Top stabilizer

    Motor stabilizerCurved borehole

    L2

    L1

    T

    Based on the assumption that the stabilizers are full gauge, and

    motor stabilizer

    Note : also called three point geometry

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    Performance ExpectationPerformance Expectation

    Bent Sub

    bent sub angles - 0.5 to 3.00

    dogleg expectancy - 1.00 to 6.00

    Bent Housing

    bent housing angle - 0.75 to 1.75

    dogleg expectancy - 1.00 to 35.00

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    Oriented Build Rate Associated with 12-1/4 Hole Size, 8 Motor Adjustable Be

    No Motor Top Stabilizer at Various Inclinations Based on Various Bent Housin

    Application (1)Application (1)

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    Oriented Build Rate Associated with 12-1/4 Hole Size, 8 Motor Adjustable Be

    Motor Top Stabilizer at Various Inclinations Based on Various Bent Housing Se

    Application (2)Application (2)

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    What was the build raWhat was the build ra

    that motor!that motor!

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    StabilizersStabilizers

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    Integral Blade StabilizersIntegral Blade Stabilizers

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    TCI Inserts on Stabilizer BlaTCI Inserts on Stabilizer Bla

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    No Hard facing on Fishing NNo Hard facing on Fishing N

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    Damaged Stabilizer BladDamaged Stabilizer Blad

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    Sleeve Stabilizer for a MoSleeve Stabilizer for a Mot

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    Adjustable Gauge StabilizAdjustable Gauge Stabiliz

    Hole Sizes : 5-7/8 - 17-1/2

    Gauge Change : 0.5 - 1.06

    2- and 3- position tool

    Operates on 400 psi

    Cycles every time pump cycled

    Pistons locked into body

    Position indication by SPP shift

    Normal drilling position: buttons

    retracted

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    Adjustable Gauge StabilizAdjustable Gauge Stabiliz

    STATUS SIGNAL - SPP

    PUMPS OFF

    PUMPS ON PUMPS ON PUMPS ON

    PUMPS OFF

    EXTENDEDRETRACTEDRETRACTED

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    Adjustable StabilizerAdjustable Stabilizer

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    AGS Used With PDMAGS Used With PDM

    mud motor

    mud motor

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    What is This?What is This?

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    DBS Cuttings Bed Impeller DBS Cuttings Bed Impeller

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