Deepwater Decommissioning Workshop 2016
Transcript of Deepwater Decommissioning Workshop 2016
Deepwater Decommissioning Workshop 2016
The Development and Field Introduction of a Subsea
Wellhead Connector for Abandonment Operations
Delaney Olstad, Weatherford International Ltd.
Outline
1. Introduction to Subsea Connectors
2. Adding Value – Changing the operations execution model of subsea P&A
operations
3. Design Requirements
4. Commissioning
5. Field Introduction
Subsea Wellhead Retrieval Services
MOST® Mechanical Outside Single Trip System
– Drilling Rig Deployed
– Monohull Vessel Deployed
Expandable Stabilizer
Multi String Cutters
Operational / Job Planning Design Software
A Weatherford exclusive, the M.O.S.T. tool has beensuccessfully deployed globally in over 1,600 wells.
Subsea Well Abandonment
Objectives Goal
Minimize rig time • Single-trip recovery
• Cut multiple strings
Recycle wellhead • Minimized damage to seal surfaces
Versatility • Cut in tension or compression
• Rotary/top drive or mud motor drive
• Eliminate lateral whip
High reliability • Positive confirmation of engagement
• Positive confirmation of cut
Mechanical Outside Single Trip (MOST) Tool
Subsea Wellhead Retrieval
Improvements to the standard MOST Tool to deal new casing sizes, weights and grades
Going through the 17.56” ID restriction in the Hi pressure housing and cutting 20 x 30 / 20 x 36 / 22 x 36
Stabilization of the Multi-String Cutter BHA gives and advantage by reducing lateral movement Expandable stabilizer expand to drift ID of
Save cutter structure and reduces cutting time.
Subsea Wellhead Operation
Provide Value / Cost Avoidance / Increase Production / Cash
Safety is fundamental
Maintain Social License
Purpose built, fit-for-purpose equipment
Proven Results – Safety, Efficiency, Reliability, Cost
Knowledge & Experience
Value added Technology
Key Drivers
Subsea Re-Entry Connectors Overview
Re-Entry Functionality: Subsea Re-Entry Mandrel or Wellhead Suspension System.
•Latch, via preloaded or loose fit interface
•Interface to axially hoist a suspended load
•“Fail Safe” locking mechanism
•Functioned by remote method
•Thru bore hydraulic, electrical and pneumatic
conveyance
SWC Facilitating Operations – Re-Entry and P&A Operations
Intervention Operations:
• XT and Well Re-Entry
• XT Installation and Recovery
• XT Barrier Verification
• Reservoir Communication
• Bullheading / Bleed off
• Injection / Sampling
• Stimulation
• XT Annulus Communication
P&A Operations Conveyance:
• Abrasive Severance BHA
• Mechanical Severance BHA
• Explosive Severance BHA
MODU
Tubulars:
• Drill Pipe or Casing Intervention String
• High Pressure Intervention Riser
• DPR System
• Through moonpool
SWC Deployment Methods
Monohull Vessel of Opportunity
Heave Compensated Wire:
• Vertical
• Horizontal, from bare deck
• Through moonpool or over the back/
side of vessel
SWC Latching and Fail Safe Lifting
• Interface to common industry mandrel and hub
profiles
• Loose fit connection, allowing ROV to
manipulate in high current conditions
• Grapple lever mechanism
• Deployment on tubulars
• Secondary locking “fail safe” mechanism
SWC Conveyance
Wire Deployment Drill Pipe Deployment Wire or Drill Pipe Deployment
Multiple trims for Monohull or
MODU deployment:
•Deployment on heave
compensated wire
•Deployment on tubulars
•Deployment on wire and tubulars
Remote Functioning
ROV selected as operator:
•Interfaces for rotation of mandrel
•Interfaces for secondary locking, once latched
•Visual marking and indication of position
•Kinematic over rotation prevention
Commissioning
Project Execution Verification and QHSE:
•Internal MC testing
•Internal MC and FAT of Assemblies
•Internal Shakedown and FAT’s
•Client witnessed FAT with “Iron ROV”
•Intercompany SIT and multi skilling
training
•Client witnessed SIT
Field Introduction – Horizontal Monohull Deployment
Deployment from a Monohull Intervention
Vessel with a heave compensated tower:
•SWC and BHA rigged horizontally.
•Hoisted to vertical
•Run through a moonpool
•Unlatched after subsea cut and
recovered, wellhead wet parked
Field Introduction – MODU Derrick Deployment
Deployment from a MODU Derrick:
•SWC connected and pulled into derrick
•Abrasive BHA rigged and pulled into derrick
•Run through rotary
•SWC with wellhead recovered through drill floor