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

Subsea Well P&A Operations Models

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 – Wet Run History Q3 2015 >

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

Questions

Comments

Purchase Orders