Hurricane Recovery
Operations Overview
Dick Green
General Manager, North Sea Business Unit
Wild Well Control
Presentation Overview
•
•
•
•
•
•
•
•
•
Challenges of Recovery Ops
Project Safety
Phase 1 – Survey/Initial Assessment
Phase 2 – Project Planning
Phase 3 – Site Prep/Debris Removal
Phase 4 – Well Bore Access
Phase 5 – Well Intervention/P&A
Phase 6 – Site Clearance
Misc. Tool Technologies
Platforms Destroyed
Platforms
Destroyed
# Operators
Involved
Water Depths
Hurricane
Katrina
44
10
30 - 340 ft
Hurricane Rita
69
27
28 – 254 ft
Hurricane Ike
52
26
25-480
Totals
162
63 *
* Some Operators sustain damages in both hurricanes.
The Challenge
•Stored Energy
•Explosion Danger from Trapped Gas
•Indeterminate Integrity and Interactions of Structure
•Must Avoid Disturbing Wells Until Pressure Is Bled Off
•Wells Sometimes Breached in Inaccessible Locations
•Identification of Structural vs. Product-Containing Pipes
•Dive Excursion Limits; ROV Tether Constraints
•Poor Structural Drawings and Well Records
•Offshore Logistics & POB Limits
•Station-Keeping Limits and Run-Offs Marine Life in Area
•Marine Life in Area
•Regulatory Oversight of Releases
•Offshore PERSONALITIES
•High Pressure Gradients “DP”
•Visibility esp. Near-Shore
•Adherence to Client Policies
•Ongoing Work in Area
•High Pressure Gradients
And Much More!
GOM 2003
Med 2004
Angola 2004
GOM 2005-2008
Typical Storm Damage
Referred to as “Downers”
Typical Storm Damage
Referred to as “Leaners”
Typical Storm Damage
For “In-Between-ers”
Shallow Debris and
Accessible Wellheads
Deck Settled on Wellheads
Extensive Damage
Deeper Water
Mud-line Failure
Subsea Recovery Project Types
Project Safety
 Safety Management System
 Employee Orientation
 Management of Change is a key part
of the operations
 Site Safety Plan and Job Safety
Plan
 Emergency Response &
Evacuation Plan
 Spill Contingency & Recovery Plan
 Safety Award Program
 Emphasis On Awareness & Teamwork
 Recognition & Involvement
• On-board Safety
Representative
• JSA’s & JSEA’s
• Permit to Work
• STOP Program
• Risk Assessment Program
• HazMat Plan
• MSDS’s
Preliminary Data Gathering
– Latest operational platform survey
– As built platform drawings and structural
drawings
– Slot location and well relationships
– Well bore schematics
– BHP and surface pressure data
– Status of wells
– Wellhead schematics
– Pipeline maps
– Field maps
– Any other pertinent data or information
Assessment
Objectives of Assessment
–
–
–
–
–
–
–
–
–
Dive Safety
Debris removal targets
Well intervention
Vessel selection
Tooling requirements
Scheduling of project
Cost scenarios
Risk scenarios
Develop and execute
(Debris / Intervention) plans
Survey Equipment
– ROV
– Mesotech Sonar
– Echoscope Multi-beam
Sonar
– Viper Fish Data Recorder
– Export to RHINO Model
– Create a mosaic of debris
field
Phase 1 – Survey
Typical Data Gathered
Photographs
ROV Footage
Mesotech
Well Files
As-Built Drawings
3-D Sonar/Imaging
Phase II
Project Planning
• Cost Estimation
– Budgetary and forward planning
• Scheduling
– Determination of project timelines and
milestones
• Asset vetting and surveying
– Surveys of OSCV and support vessel (s)
• Asset selection & procurement
– Determination of fit for purpose
– Contracting and negotiations
• Logistics
– Equipment
– Personnel
– Dock Facilities
Working Model of Downed Platform
Developed From Survey Info
Review Survey to identify wellhead access and
visible conductor breaches which dictate well
bore access plan
Before Katrina
After Katrina
Develop “As Built” vs “As Is” Models
Procure Equipment & Services
• Personnel
•
•
Experienced Recovery Personnel
Service Technicians
• Vessels
•
•
•
DP
Moored
Jack-up
• Dive Systems
•
•
•
Surface
Mixed Gas
Saturation
• Navigation and Positioning
•
Survey & Mesotech
• Cutting Tools
•
Construction & Wells
• Wellheads
• ROV & Tooling
•
•
•
•
Hot stabs
AHPU
Chop saws, grinders, etc.
Subsea Lighting
• P&A Equipment
•
•
•
Subsea BOP/Lubricators
Pumping
Wireline
Select Vessel
•
•
•
•
•
Water Depth
Debris Field/Bottom Conditions
Lift Capacity
Deck Space
POB
DP 2/3
Moored
Lift Boat/Jack-Up
Phase III
Site Prep/Debris Removal
Phase III-Site Prep/Debris Removal
–
–
–
–
–
–
–
–
–
–
Jacket Technical Data Sheets
Lift Size And Weight Philosophy
Cutting And Shearing Methodology
Rigging Philosophy
Dive Safety and Navigation
Debris Placement / Removal & Mapping
Debris Disposal (If not reefed or required)
Stored Energy Issues (safety contingencies)
ROV Support (Visual & Intervention Support)
Media & Data Capturing / Storage (Viper Fish)
Phase III – Site Preparation
Typical Equipment
Shears
ROV Tooling
Diamond Wire
Diver Burning/Hand Cutting
Gated Shear
Minimum Debris Clearance
to make safe for Well
Access & Intervention ops
Area where Hot Tap, Wellhead
Install and Intervention Ops
will take place
Phase IV
Well Access
Well Investigation and Access
•
•
•
•
•
•
•
•
Survey and Trace conductors, Tag conductors w/ well #s.
Evaluate Access Options
Repair existing wellhead and kill well if wellhead is
accessible
Strongback and Hot Tap or Direct Hot Tap if wellhead is
not accessible
Once Secure make DWC Cut on Conductors
Wedding Cake Casings and Install Wellhead
Install tubing hanger/ pack off and tension tubing
Install Tree
Secure well pending final P&A
Initial Wellbore Access
Through the Wellhead (if accessible) or Hot Tap the Casing/Tubing
Phase IV – Well Bore Access
Typical Equipment
Diamond Wire
Longitutadal Cutting Tools
Strong Back
Hot Tap
Radial Cutting Tools
Direct Hot Tap (if required)
Direct
Hot Tap
Basic
Example
Direct Hot Tap is faster than a conventional hot tap with
strongback, ring & peel. But it must be used
appropriately…
Re-Heading on vertical
Fresh Head
Wedding Cake
Install Wellhead
Phase V
Well Intervention / P&A
• Phase V Well Intervention
–
–
–
–
–
–
–
–
–
–
Wellhead Intervention
Direct Hot Tap
Strong back placement as required
Hot Tap of casing strings
Shearing of conductors as required
Annuli isolation
Pollution containment & decanting
Pumping of kill fluids and cement
Removal of horizontal sections of conductors
Install wellheads on verticals
Wells Secured Awaiting Final P&A
Plug & Abandonment Operations
Riserless Subsea Intervention
Well P&A Schematic
Miscellaneous Tool Technologies
SeaSun Subsea Lighting System
Excavation
Phase VI
Site Clearance
Even in the presence of a reefing
permit, the platform deck is often
targeted for removal due to
hydrocarbon-containing
equipment.
Platform & Wreck Removal
• Experience and personnel to plan and execute
the salvage and or recovery of vessels and
platforms
• Heavy Lift Assets
– Superior Performance
• 800 ton DB
Questions?
Questions?