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6.0 Casing Directional Drilling Field Trial Results

Jun 02, 2018

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    Agenda

    Why Casing Directional Drilling

    Using a drilling test facility

    Surface and downhole tools

    7 5/8-in. test objectives and results

    10 -in. test objectives and results

    Conclusions On to Eldfisk

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    Types of Casing Drilling 2000+ Casing Sections

    51%

    31%

    18%

    Non-Retrievable

    Liner Drill ing

    (TD liners and

    trouble zones)

    Non-Retrievable

    Casing Drill ing(conductors, vertical to TD

    and drillable bits)

    Retrievable

    Casing Drill ing

    (directional, distance andformation evaluation)

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    O1

    O3O2

    CD

    (SPE 79862)

    Casing While Drill ing

    Eliminates Lost Circulation Problems at Lobo

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    Key Question

    Can the straight hole benefitsrealized in the Lobo Field be

    transferred to directional drillingoffshore?

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    Casing Drill ing Benefits

    Casing while Drilling reduces trouble time (losses,

    sloughing and sticking). . . . The smear effect

    ConocoPhillips and others want to apply this benefit

    to high cost environments (North Sea, Alaska, Gulf of

    Mexico) - Efficiency savings typically are 15%

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    2005 Test Plan Objectives Objectives

    1.Prove casing directional drilling capability with rotarysteerables in larger hole sizes.

    2.Directionally drill with the new casing sizes similar toEldfisk (10-3/4 & 7-5/8)

    3.Provide information for training and regulatoryprocess that will ensure a successful introduction intooffshore Norway.

    4.Perform casing drilling operations on a non-Tesco rig.

    5.Test benefits of casing drilling to reduce NPT outsideof South Texas.

    6.Evaluate ability of casing drilling to make drillingoperations cheaper.

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    Split Block

    Swivel with space for

    Wireline BOP

    Top Drive System

    Casing Drive System

    10 -in. casing

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    7 5/8-in. Casing Drive System

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    10 -in. Casing Drive System

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    Downhole Tools

    Casing Profile Nipple (CPN)

    Drill Lock Assembly connects BHA to

    Casing

    Straight Hole Motor

    Underreamer

    MWD must be battery powered Rotary Steerable System

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    internal

    tandem

    stabilizer

    Casing Dir.

    Dril ling BHA

    Non-Directional

    Motor

    Motor Bit Box

    9-7/8 Under-reamer

    Roller Reamer

    Stabilizer

    MWD

    System

    Vibration subRotary Steerable

    System

    PDC Bit

    7-5/8"

    casing

    shoe

    DLA STD Vertical

    Dril ling BHA

    Underreamer

    Tandem

    Stabilizer

    PDC Bit

    Casing While Drill ing BHA Designs

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    7 5/8-in. DLA

    (Drill Lock Assembly)being added to the

    BHA

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    Housing Sub for Vibration Sensors

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    Testing Objectives

    7-5/8 test mainly to test the function of thenew DLAs - both setting and retrieval

    10-3/4 test mainly to prove directionalperformance and gain drilling mechanics

    data

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    7-5/8 Test Plan

    Run and retrieve Drill Lock at 0, 45 and 90degrees

    Drill 1000 of lateral

    Turn at 1.0 deg/100 right

    Turn at 3.0 deg/100 left

    Collect Drilling Mechanics data

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    7-5/8 Test Results

    Over half the test time and cost devoted to

    rig up and down of equipment DP retrieval cancelled tool not designed

    for purpose

    High solids mud test not done first testdemonstrated where solids could settle

    DLA performance good in all angles Test highlighted the need for wire release

    from the running or retrieval tools

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    0

    500

    1000

    1500

    2000

    2500

    0 500 1000 1500 2000 2500 3000 3500

    Displacement (azi=152) (ft )

    TVD

    (ft)

    Test 5

    Drill 850 ft HZ

    Test 1

    Test 2

    Test 3

    Test 4

    Horizontal Well Trajectory for 7 5/8

    Casing Directional Drilling (CDD) Tests

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    Landing the Bit 7 5/8 CDD Test

    0

    50

    100

    150

    200

    297 298 299 300 301 302 303 304

    Rig Time (hrs)

    various

    3820

    3840

    3860

    3880

    3900

    3920

    3940

    D

    epths

    (ft)

    torque

    pump

    pressure

    RPMs

    depths

    Landing

    Under-reamer

    Drilling ahead

    flowShock sub

    Gs

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    0

    2000

    4000

    6000

    294 300 306 312 318 324 330

    Rig Time (hrs)

    RS

    SSHK/min

    0

    10

    20

    30

    40

    50

    60

    70

    80

    Vib

    subG's

    Landing

    Under-reamerRSS

    shocks

    Vib subGs

    Shock Data for Entire 7 5/8-in. CDD run

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    10-3/4 Test Plan

    Test set and retrieve new 10-3/4 Drill

    Lock

    Dress off kick off plug

    Kick off from vertical and build at a lowbuild rate between 0.5 to 1.0 deg/100

    Increase build rate to 3.0 to 3.5 deg/100

    Build to 50 deg and turn 50 deg azimuth

    Collect Drilling Mechanics Data

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    10-3/4 Test Results

    Majority of the test was taken up indetermining DLA/CPN deficiencies

    Only 842 drilled

    Further field testing of the 10-3/4 DLAwas done to qualify redesign

    Directional control was demonstrated to be

    similar to DP drilling Motor speed and torque output at low

    flows is still an issue

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    10-3/4 Test Results - 2

    Downhole recorded mechanics data

    revealed trends that need to be followed

    up on

    Significant time and cost required to outfitthe rig and then rig down

    Test site allowed the project to be

    managed for 12 and 24 hour coverage

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    0

    500

    1000

    1500

    2000

    2500

    3000

    3500

    4000

    4500

    -500 0 500 1000 1500 2000 2500 3000 3500 4000 4500 5000 5500 6000Disp azi=167 (ft)

    TVD

    (ft)

    Plan View Trajectory at Cameron

    for 10 3/4 Casing Directional Drilling Tests

    13 3/8 csg @2003ft

    KOP: Build to 50 deg testing different rates (planned)

    TD 5000ft

    Casing Directional Drilling

    9 pilot hole

    12 under-reamed hole

    Actual Total Depth of the test was 2966 ft, with 15

    degrees of inclination built.

    (planned depth)

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    Directional Drilling Observations

    Directional performance went well, as expected.

    The low curve rate test at 0.5 deg/100ft had a

    0.9 deg/100ft rate

    The high curve rate test at 3.5 deg/100ft had a

    3.4 deg/100ft rate

    Higher curve rates are possible as results were

    not seen for a 100% setting of the RSS. No rotary steerable system damage was seen or

    reported.

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    Directional Performance 7 5/8 CDD Test

    80

    82

    84

    86

    88

    90

    92

    94

    96

    98

    3600 3800 4000 4200 4400 4600

    MD (ft)

    INCL

    (deg)

    140

    142

    144

    146

    148

    150

    152

    154

    156

    158

    AZI(deg)

    Tool setting108@

    40%

    Tool setting

    247@60%

    Tool setting

    0@10%

    Inclination

    Azimuth

    Left Turn TestPlan: 3.0 deg/100ft

    Actual 4.3

    deg/100ft

    Hold Test

    Left

    Right

    Right Turn Test

    Plan: 1.0 deg/100ft

    Actual: 1.4 deg/100ft

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    10-3/4 Directional Performance

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    Conclusions The two casing directional drilling tests were a cost

    effective dress rehearsal for Eldfisk Norway.

    CDD technology was successfully transferred tonew casing sizes.

    Modifications to downhole tools have been made

    and successfully tested (Lobo March 06). A rotary steerable system in the pilot hole provides

    effective directional control in CDD.

    Vibrations in the BHA are better understood, theireffects have been reduced, but they are still aconcern.

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    On to Eldfisk

    Two directional wells to +/- 50 degrees arescheduled for Oct 2006.

    10 -in. CDD to 5100 ft (MD) 7 -in. CDD to 11800 ft (MD)

    Wells to be drilled from a common

    wellhead.

    Rig Modifications Winch Platform &

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    Rig Modifications Winch Platform &

    Traction Winch System

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    Rig Modifications Crown Sheaves

    Rig Modifications Wireline BOP & Split

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    Rig Modifications Wireline BOP & Split

    Block

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    From Texas to Norway 2/7 Eldfisk Bravo