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SubseaBOP Stack

Arrangements

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Subsea Engineer s Handbook Section 12

In-Spec Inc. 1999 Subsea BOP Stack Arrangement

Table Of ContentsSection 12

Page

1. Subsea BOP Stack Arrangement - A 1

2. Subsea BOP Stack Arrangement - B 2

3. Subsea BOP Stack Arrangement - C 3

4. Subsea BOP Stack Arrangement - D 4

5. Subsea BOP Stack Arrangement - E 56. Subsea BOP Stack Arrangement - F 6

7. Subsea BOP Stack Arrangement - G 7

8. Subsea BOP Stack Arrangement - H 8

9. NTL No. 99-G09 MMS Letter to Lessees 5/10/99 9

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In-Spec Inc. 1999 1 Subsea BOP Stack Arrang ement

1) Subsea BOP Stack - Arrangement A

UpperAnnular

Connector

LowerAnnular

Connector

Blind Shear

Upper PipeRam (UPR)

Middle PipeRam (MPR)

Lower PipeRam (LPR)

LIK LOK

UOC UIC

LOC LIC

Features

1. Can hang off on 2 piperams circulating normally.

2. Can hang off all pipe ramswith shear ram closed.

3. No outlet below lower ram.4. Two routes to circulate kick

with pipe rams closed.

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2) Subsea BOP Stack - Arrangement B

UpperAnnular

Connector

LowerAnnular

Blind Shear

Upper PipeRam (UPR)


Lower PipeRam (LPR)

Connector

LIK LOK

UOC UIC

LOC LIC

Features1. Can hang off all pipe rams.2. Can hang off on 2 pipe

rams with shear ramclosed.

3. Two routes to circulate kickwith pipe rams closed.

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3) Subsea BOP Stack - Arrangement C

Features

1. Can hang off all pipe ramscirculating normally.

2. Can hang off on 3 piperams with shear ramclosed.

Upper

Annular

Connector

LowerAnnular

Blind Shear

Upper PipeRam (UPR)


Lower PipeRam (LPR)

Connector

LIK LOK

UOC UIC

LOC LIC

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4) Subsea BOP Stack - Arrangement D

UpperAnnular

Connector

LowerAnnular

Blind Shear

Upper PipeRam (UPR)


Lower PipeRam (LPR)

Connector

LIK LOK

UOC UIC

LOC LIC

Features

1. Can hang off 2 pipe ramscirculating normally.


3. One route to circulate kickwith pipe rams closed.

4. No outlet under lower pipe

ram.

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5) Subsea BOP Stack - Arrangement E

UpperAnnular

Connector

LowerAnnular

Blind Shear

Upper PipeRam


Lower PipeRam (LPR)

Connector

LIK LOK

UOC UIC

LOC LIC

Features



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6) Subsea BOP Stack - Arrangement F

Features



UpperAnnular

Connector

LowerAnnular

Blind Shear

Upper PipeRam (UPR)


Lower PipeRam (LPR)

Connector

LIK LOK

UOC UIC

LOC LIC

UOK UIK

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7) Subsea BOP Stack - Arrangement G

UpperAnnular

Connector

LowerAnnular

Blind Shear

Upper PipeRam (UPR)


Lower PipeRam (LPR)

Connector

LIK LOK

UOC UIC

LOC LIC

Features

1. Upper and Lower Annularis on the LMRP.

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8) Subsea BOP Stack - Arrangement H

UpperAnnular

Connector

LowerAnnular

Blind Shear

Upper PipeRam (UPR)


Lower PipeRam (LPR)

Connector

LIK LOK

UIK UOK

C/K Isolation

C/K Isolation

UOC UIC

LOC LIC

Features

1. Upper Inner and Outer KillValves below the Upper

Annular.2. C/K Isolation Valves are on

the LMRP package. Note:these valves are normallyopen.

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UNITED STATES DEPARTMENT OF THE INTERIORMINERALS MANAGEMENT SERVICE

GULF OF MEXICO OCS REGION

NTL No. 99-G09 Effective Date: May 10, 1999

NOTICE TO LESSEES AND OPERATORS OF FEDERAL OIL, GAS, AND SULPHURLEASES IN THE OUTER CONTINENTAL SHELF, GULF OF MEXICO OCS REGION

Location of Choke and Kill Lines on BOP Stacks

This Notice to Lessees and Operators (NTL) supersedes the Letter to Lessees andOperators, dated November 17, 1994, on this subject. It updates regulatory citationsand includes a statement on the Paperwork Reduction Act of 1995.

The purpose of this NTL is to specify the location of the choke and kill lines servingblowout preventer (BOP) stacks. This is necessary because the requirements at 30CFR 250.406 (oil and gas drilling operations), 250.515 (oil and gas well-completionoperations), 250.615 (oil and gas well-workover operations), 250.1610 (sulphur drillingoperations), and 250.1624 (sulphur well-completion and well-workover operations) donot specify their exact location.

Operators usually install the choke and kill lines above the bottommost ram. However,some operators have requested to install them below the bottommost ram. For chokelines, this is not acceptable. Failure of a choke line installed below the bottommost ramcould result in a blowout because this configuration does not provide a backup systemfor proper well control.

Therefore, the Gulf of Mexico OCS Region District Offices will not approve anApplication for Permit to Drill (APD) or a Sundry Notice and Report (Sundry) to conductwell-workover operations that indicates a BOP stack with a choke line installed belowthe bottommost ram. However, they may approve your requests to install a kill linebelow the bottommost ram. You must include a schematic drawing of the BOP stack

and choke and kill lines with any APD or well-workover Sundry if the tree is to beremoved.

Paperwork Reduction Act of 1995 Statement

This NTL refers to the collection of information on forms MMS-123 and MMS-124. TheOffice of Management and Budget (OMB) has approved the information collectionrequirements for these forms and assigned OMB Control Nos. 1010-0044 and 1010-

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0045, respectively. This NTL does not impose additional information collectionrequirements subject to the Paperwork Reduction Act of 1995.

Contact

If you have any questions on this NTL, you may contact Mr. Bill Martin at (504) 736-2849.

Chris C. Oynes

Regional Director

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