Bonga Well Intervention Project - · PDF fileTitle: SILS Project Review Author: Melissa.M.Atkins Created Date: 5/25/2017 1:55:43 PM

Copyright of Shell International

Bonga Well Intervention ProjectRig-Less Operations

SPE Technical MeetingMay 25, 2017

Tobe Ezeokafor, Well Intervention LeadSNEPCO

111/05/2017


Agenda

• Introduction

• Bonga Intervention Scope of work

• Equipment and Execution

• Sequence of Events

• Performance and Results

• Best Practice/Lessons Learnt

211/05/2017


Current Development:

• Oil Development, Deepwater Nigeria

• 120km offshore

• Water Depth: 1,000m – 1340m

• Oil Production Wells

• Water Injection Wells

Introduction to OML 118 (Bonga Main) Project


Scope of Work

• Temporary Well Suspensions~ B-5, B-17, B-23, B-32 and B-38

~ Bull head kill, punch tubing, bull head back side

~ Set/test plug below production packer, cut tubing if required (no PBR)

~ Set/test shallow plug below tubing hanger and move off

~ Field Support Vessel remove well jumper and harvest Christmas Tree Offline

• Acid Stimulation~ B-27 oil producer, Frac Pack completion in 9-5/8” casing, 75 ft Perfs and 5-1/2” Tubing

~ 3 Stage Job: 10% HCl, 5% NH4Cl, 9:1 Mud Acid, 5% NH4Cl and HEC Diverter

~ 1,010 bbl total volume pumped

• Christmas Tree Replacement~ B-24 oil producer, Set/Test 2 plugs below TH, Recover Tree to FSV, Run New Tree, recover 2 plugs

411/05/2017


General Arrangement

511/05/2017


Cross SILs deployment






Subsea Valve configurations

911/05/2017

Flush lines Bullhead AnnulusBullhead Tubing


Well Schematic (Suspension)

1011/05/2017

• One deep set plug set below

production packer

• One shallow set plug in hanger nipple

profile

• If required cut tubing above the

production packer to aid retrieval of

the tubing during abandonment


Deck Layout

1111/05/2017


Stack Up and Deck Modifications

1211/05/2017


Moon Pool Work Area

1311/05/2017


Lubricator Laydown Assembly

1411/05/2017


Sequence of EventsSILS FAT/SIT in Houston Oct 8, 2016

SILS Ship Date Oct 17, 2016

ITR (peer review) Oct 27, 2016

FSV Site Survey GOM Nov 10, 2016

IWOP in Lagos Nov 14, 2016

HazId Workshop in Lagos Nov 15, 2016

SILS Arrive Onne Dec 5, 2016

BOA Deep C Arrive Onne Jan 3, 2017

Mobilize Contractors Jan 6, 2017

SILS Customs Clearance Jan 16, 2017

FSV Depart Onne Jan 27, 2017

Complete B-27 Acid Stimulation Feb 2, 2017

Mob/De-Mob in Onne Feb 9, 2017

Start B-24 activity Feb 10, 2017

TAM Mar 4, 2017

Finish B-38 activity transit to Onne Mar 24, 2017

De-Mob Complete Mar 30, 2017

1511/05/2017

2016

2017


Project Results

• Bonga 27

~ Job pumped per design at 3 bpm, 26% increase in production

• Bonga 24

~ 2 plugs set/tested, SSXT recovered, new SSXT installed and 2 plugs recovered

~ Issues opening SCSSSV, post-TAM FSV return to open SCSSSV, Production restoration oil

• Bonga 32, 05, 17, 23, 38

~ 2 plugs set/tested, SSXT recovered offline

1611/05/2017


Rigless Campaign Performance (Time)

17

Description

Planned Days 115.5

Actual Days 132

NPT 23%


Best Practice

Best Practice Transiting between well locations with Lubricator and Well Control Package (WCP)

hanging 500 ft above mudline on crane lines. Optimization of test of WCP Chemicals to be loaded out in smaller containers to reduce wastage Restructure logistics to eliminate inefficiencies in lifting equipment from the quayside to the

vessel Mock rig up of pumping equipment as part of SIT

18


Lesson Learned (Selection)

LBOP Seal Failure

19



Burst Hose

20



PBIV Failure

21


Lessons Learned (Selection)

Damage To ROV Umbilical

22



EDL Damage

23



Stuck Xmass Tree Nose Cone

24

Copyright of Shell International 25

Teamwork

11/05/2017

Documents

Bonga Well Intervention Project - · PDF fileTitle: SILS Project Review Author: Melissa.M.Atkins Created Date: 5/25/2017 1:55:43 PM