KOFiLMED - Bureau of Safety and Environmental Enforcement A pit of 12.0 ppg mud will ba mixed and held

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  • J

    TO: 0KS-2-*

    FRON: OS-7-1

    Supplemental Plan of Exploration

    Control No. .

    •., . mmvNm fmjg v,-.... •••• 'fimwm * m r_ _ ^

    MICR0H L M E 0

    • i. Lease OCS-6 V V J i

    TO l «

  • ARCO Oil and Gts Company South Louisiana Districl Post Office Box 51401. Oil C t n t t r Lafaytt ' t . Louisiana 7OS0S Telephone 311 264 4410

    John L. Morgan Oltshora District Drilling Superintendent

    March )2, 1981

    Mr. D. W. Solanaa Araa Oil & Gaa Supervisor U.S. Geological Survey P.O. Box 7944 Matairla, LA 70010

    jr. • Dear KT". *ux«nas:

    Vith thia latter and tha accompanying documents, we ara submitting a Supple- mental Plan of Explbratlon for Viosca Knoll Block 863, OCS-G-4133. OS-7-1.

    Should you require additional information, please "ontact aa at 318-264-4000.

    Si- carely,

    W. R. Worthington

    District Drilling Engineer, Cffshore

    SCL:/lew

    MICROFILMED

    jjm-«*B

  • ARCO OIL & GAS

    SUPPLEMENTAL PLAN OF EXPLORATION VIOSCA KNOLL BLOCK 863

    (OCS-G-4133) OS - 7 - i

    TABLE OF CONTENTS

    A. Discussion

    B. Estimated Time Table

    C. Vicinity Plata I . Public Information

    D. Shallov Hazards Report (Proprietary) 1. Proposed Well Locations 2. Watar Depths 3. Structure Map

    E. Geological Information (Proprietary) t. Interpretation Letter 2. arface and Boctom Hole Location Maps 3. Structure Map

    F. Onshore Support Facility

    G. Oil Spill Contingency

    9. Drilling Mu

  • D R I L L I N G D I S C U S S I O N

    ARCO OIL & GAS COMPANY

    VIOSCA KNOLL BLOCK 863

    OCS-G-4133

    D r i l l i n g w i l l be done with the se l f -propel led semisubmersible r i g ALEUTIAN KEY,

    which hes a water depth ra t ing of 2,000'.

    Thirty Inch OD 1" WT structural pipe w i l l be j e t t e d / d r i l l to 350' below the mud-

    l ine (BML). No BOP equipment w i l l be ins ta l led on the wellhead wheo d r i l l i n g

    the 26" conductor hole due to the formation competency $\\. being adequate to

    permit c i r c u l a t i n g the d r i l l i n g f l u i d s back to the d r i l l i n g +1200' above the

    mudline. I n th^unMl^Tv^ event that a major gas flow Is encountered, the

    contingency plan tu winch in the up current anchors and use the vessel'L power

    to move i t to a safe distance from the location i s described under "Emergency

    Procedures". A schematic diagram showing the equipment f roo the rotary table to

    tha conductor shoe sett ing depth i s enclosed with t h i s appl icat ion. A 9 7/8"

    p i l o t hole w i l l be d r i l l e d to 1,000* BML using seawater, wi th a viscous mud

    sweep used as needed to keep the borehole clean. Af te r the p i l o t hole i s logged,

    the hole w i l l be opened to 26" and f i l l e d with viscius mud pr ior to running 20"

    conductor casing. Returns for t h i s hole w i l l be c i rculated to the seafioor. The

    20" conductor w i l l be tested tc 200 psi before d r i l l i n g out the shoe.

    The subsea BOP stack, r i se r , and diver ter system w i l l be run and connected to the

    20" wellhead. Before d r i l l i n g below the 20" casing, cnly the diverter system con-

    sis t ing o f a d iver te r head and two 10" diverter l ines w i l l be used to control a

    well kick. ' The diver ter system w i l l be tested by closing the diverter and pumping

    through each 10" l ine pr ior to resuming d r i l l i n g operations. The diverter l i n e

    w i l l be equipped wi th automatic remcte-controlled valves which w i l l be opened p r io r

    to shutting i n the we l l . The two l ines w i l l discharge at the opposite ends of the

    vessel so that downwind diversion can be achieved. A diagram of the diver ter sys-

    tem (Sec t . I ) i s enclosed with th i s appl icat ion. A p i t of 12.0 ppg mud w i l l ba

    mixed and held ready in case a shallow gas sand is encountered before the 13 3/8"

    surface casing i s set @ 43500' BML.

    MICROFILMED

  • The 13 3/8" surface casing w i l l be set and cemented at +3500' BML. The previously

    run, remotely-controlled hydraulic subsea preventers, consisting of two 18 3/4"t 5000WP Hydrii Type GL annular preventers and four 18 3/4", lOOOOpsi WP ram type

    preventers w i l l ba used below the surface casing string. The BOPE system, except

    for the 13 3/8" surface casing w i l l be set and cemented at +3500' BML. The previous-

    l y run, remotely-controlled, hydraulic subsea preventers, consisting of two 18 3/4",

    5000psi WP Hydrii Type GL annular preventers and four 18 3/4", lOOOOpsi WP ram-

    type preventers, one of which is a blind/shear ram type, w i l l be used below this

    casing string. The choke and k i l l lines, choke manifold, and hydraulically -

    operated adjustable choke are a l l rated at lOOOOpsi WP. The preventer system w i l l

    be stump tested prior to running and periodically tested and blowout d r i l l s held

    in accordance vith OCS Order #2. The 13 3/8" surface casing w i l l be tested to

    15G0 psi before d r i l l i n g out the shoe. After d r i l l i n g out the shoe and a maximum

    of 50' of formation, a leakoff test v i l l be conducted and recorded. This data

    v i l l oe used to help determine the depth of the next casing string i f needed.

    As pore pressure or other hole conditions dictate, a 9 5/8" casing string v i l l

    ba run as an intermediate protective liner @ +8700' BML. The 9 5/8" liner v i l l

    ba run and the same blowout control system utilized on the 13 3/8" casing w i l l

    be used. The casing w i l l be pressure tested, and a leakoff test performed and

    recorded before d r i l l i n g ahead. ^

    I f abnormal pressure or other hole control problems occur, a 7" contingency

    liner can be run. When this protective d r i l l i n g liner is run, the same procedure

    used for the 13 3/8" ana 9 5/8" casing w i l l be followed.

    The v e i l v i l l be drilled to a total depth of approximately 5100', logged and

    evaluated. Since the well is planned as an expendable exploratory well, i t w i l l

    be permanently plugged upon evaluation, as per OCS Order #3. The specific pro -

    cedure for P&A operations w i l l not be initiated without prior approval of the USGS.

    An adequate inventory of nud materials, within available storage space on the r i g ,

    v i l l be maintained to provide a margin of safety while d r i l l i n g this well.

    See attached DRILLING PROGRAM

  • DRILLING 26" HOLE- WITHOUT MARINE RISER - SCHEMATIC

    (NOT TO SCALE)

    9 7/8" Hole to 1,0 00' SML

  • Casing Size

    30"

    20"

    13 3/8"

    9 5/8"

    7"

    D R I L L I N G P R O G R A M

    ARCO OIL 6 GAS COMPANY

    VIOSCA KNOLL BLOCK 863 OCS-G-4133

    Depth Set

    +350' BML

    +1000' BML

    +3500' BML

    +8700' BML

    +11700' BML

    Geologic Data

    Test Preaaure Max Pore. Press Anticipated Hasards

    None

    200 psi

    1500 psi

    2000 psi

    2500 psi

    8 9 ppg

    10.0 ppg

    12.0 ppg

    15.0 ppg

    17.0 ppg

    NONE

    NONE

    NONE

    NONE

    NONE

    See accompanying Formation Characteristics Plot for further Information

    Casing Program

    SIZE WEIGHT

    tm GRADE CONN DEPTH

    RBK CASING DESIGN FACTORS

    COLLAPSE BURST TOOL JOINT PIPE BODY

    30" 20"

    310 133

    B K-55

    WELDED 1650' BTC 2300'

    ML JV46 2.70

    1.98 1.87 10.00 10,00

    L3 3/8" 72 S-95 BTC 4800' 1.99 1.55 - — ML 5.83 1.72 9.10* 9.28

    9 5/8" 47 S-95 BTC 10,000' 3.36 1.13 - 45O0' 1.95 1.31 7.32 7.41

    7" 32 P-110 ITC 13,000' 4.24 1.75 --_ 9700' 3.80 1.69 10.CO 10.00

    6 7" i s planned only as a contingency d r i l l i n g l i n e r .

    Logging Program

    ISF/BHC Sonic, FDC-CNL-GR,

    ISF/BHC Sonic, FDC-CNL-GR,

    HRD and Veloc i ty Surveys at

    SWC

  • D R I L L I N G P R O G R A M

    ARCO OIL & GAS COMPANY VIOSCA KNOLL BLOCK 863

    OCS-G-4133

    Mud Prograa

    Depch - RKB

    0 - 4,830'

    4,830 - 10,000'

    10,000 - 15,000'

    Weight

    9.0 - 9.6 ppg

    9.3 -12.0 ppg

    12.0 -15.0 ppg

    Viscosity

    40

    40-45

    40-50

    Water L 3*

    No control

    4

    4

    BCP

    BOP System

    Over Casing String

    None - D r i l l w i t h open returns to sea f l o o r . 30"

    2 - 1 8 3/4" H y d r i i Type GL* 20" 2— 18 3/4" CIW Type "U" Double Rams* 1 - 22" Regan KFDH Diverter 2 - 10" Diverter Lines with Hydraulic Valves

    2 - 1 8 3/4" H y d r i i Type CL 13 3/8" 2 - 1 8 3/4" CIW Type "U" Double Rams of which 1 i s blind/shear

    type. A l l equipped as subsea stack.

    Sane as 13 3/8" 9 5/8"

    *Will not be used to control wel l over t h i s size casing

    Testlr^ of BOP systems will be as prescribes in OCS Order 92.

    Auxiliary we l l - con t ro l equipment fo r a l l d r i l l i n g operations w i l l include the fo l lowing :

    1. Inside BOP f o r d r i l l pipe i n use. 2. Safety valve f o r a l l work s t r ings . 3. Kelly cock bel