Valhall Field

PCP

DPQP

WPVALHALL

STAVANGER

0 100 km

UNITEDKINGDOM

NORWAY

GERMANY

DENMARK

UNITEDKINGDOM

GERMANY

DENMARK

NORWAY

0 100 km

HOD

Valhall – PL006BOn Stream in 1982OOIP: 2,7 bnstb oilReserves: 1060 MMstb oilCum prod: 420 MMstb oilCurrent Prod: 85 mbbls oil

Projects:Infill Drilling – WP and DP2003: Water Injection Project2002/03: Valhall Flank Development

Valhall Depletion Strategy

• Short term (2000 - 2003):– Valhall field primary depletion, Tor and Lower Hod formation - drill up WP

slots and ‘repair’ DP slots.

• Medium term (2003 - 2006):– Secondary recovery: Phase 1 Waterflood Valhall Tor formation– Develop Valhall flanks - primary depletion– Appraise Flank upside and Area prospects– Continued infill drilling / ’repair’ wells

• Long term (2006 ->):– Optimize Valhall Waterflood– Opportunities for Valhall EOR– Continued infill drilling / ’repair’ wells– Re-development ?

Current Valhall Wells

• Wellhead and drilling platforms - 49 wells– Monobore horizontal completions– Designed for multiple proppant fracturing– Designed for SIMOPS completion– Coil tubing access for completion and well clean out– Completed with heavy wall liner for collapse resistance– Completion designed for primary depletion

Current Valhall Wells

7" x 4 1/2" Packer

4 1/2" DHPG

5 1/2" TRSCSSV

5 1/2" 20# Tubing

6 5/8" 66# Liner

9 5/8" 53.5# csg

Producer Well CompletionCurrent Design

Tubing Hanger

Hydraulic LineDHPG Line

Control Line Color Code

3.750" Landing Nipple

5 1/2" ASV

4 1/2" 12.6# Tubing

x-over 5 1/2" x 4 1/2"

4 1/2" Gas Lift Mandrel

4 1/2" Mule Shoe

13 3/8" 72# csg

Challenges Ahead - Waterflood

• Possible flow anisotropy and direction − Risk of premature water breakthrough along faults/fractures

• Water injectivity − Effect of pressure/temperature induced fracturing

• Effect of Water weakening of the Chalk• Scaling• Water management• Chalk influxes

Developed Completion Schematic

5 1/2" TRSCSSV

5 1/2" 20# Tubing

6 5/8" 66# Liner

9 5/8" 53.5# csg

Producer Well CompletionPerf Valve System

21 1/4" Tubing Hanger8 Feed Through

Hydraulic LineDHPG Line

Control Line Color Code

5 1/2" ASV

4 1/2" 12.6# Tubing

x-over 5 1/2" x 4 1/2"

4 1/2" Gas Lift Mandrel

4 1/2" Gas Lift Mandrel

13 3/8" 72# csg

9 5/8" Packer 2 x 1/4" Feed Through

Landing Nipple

No Seal Expansion Joint

Hydraulic Wet Connector

6 5/8" Perf-Valve 6 5/8" Perf-Valve

6 5/8" Perf-Valve

6 5/8" Perf-Valve

6 5/8" Perf-Valve

DTS Line 2 x 1/4" CL

10K Liner Hanger

9 5/8" 53.5# csg

4 1/2" DHPG

Fibre Optic Line

Development Challenges

Cementing

Barrier issues

Deployment

Control lineintegrity

Collapseresistance

Packer performance

Alignment

ResourcesLinerrotation

Groove inliner

Bu

ProtectorsCentalizers

dgets

Time Pipeconnections

Functional Requirement

SystemRequirement

Liner Installation UpperCompletion Installation

Proppant Stimulation

Fiber Optic Installation

Production Well Intervention Contingent Perforating Re-Stimulation Workover

Acid Stimulation

Mod

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Joint Development Project

Q4/01

Q1/02

Q2/02

Q3/02

Q4/02

Q1/03

Q2/03

Time

Task

Q4/01

Q1/02

Q2/02

Q3/02

Q4/02

Q1/03

Q2/03

Prestudy/work

Agreement15/5 '02

PV Redesign

Packer Design

Expansion Joint

Connection &flatpack design

Stack-up Test10-14/3 ’03

DTS Completion Schematic

6 5/8" 66# Liner

9 5/8" 53.5# csg

Upper Completion Parts

Hydraulic Wet Connector

Lower Completion Parts

Turnaround subPerf ValvesPerf Valve DTS Lines

Feed Through Packer

Lower Completion Components:– Perf Valve– Liner Hanger System– Timed Connection-slotted pipe– Casing Receptacle

Upper Completion Components:– Wet Connect– Expansion Joint– Retrievable Production Packer

Lower Completion: Perf Valve

Feature Benefit:

Multiple Piston: No perforation

Proppant Frac Resistant

Adjustable flow area

Contaminate cement

Sliding Sleeve: Selective production/injection

Maintain Well Integrity

Liner Mounted: Cemented in place

Lower Completion: Timed Connections

Standard NSCC connection

Lower Completion: Turnaround Sub

Lower Completion: Casing Receptacle

• Liner mounted part of Wet Connect

• Provides the reconnect point for the 1/4” control lines

• Contains the male half of the hydraulic connector.

• Allows the control line to pass from inside the liner to outside.

Upper Completion: Wet Connect

Reconnect Lock Assembly

• Run at the bottom of the completion

• Locates, aligns and locks into the Casing Receptacle.

• Connects the control lines from the completion to the liner

Indicating Collet

Feed Thru’ Lock

Cylinder Spring

Alignment Profile

Upper Completion: Expansion Joint

Expansion Joint

• Run between packer and wet connect

• Rotational locked

• 2 meter stroke

• 2 ea ¼” control line by-pass

Upper Completion: Feed Through Packer

• Retrievable Packer, 7.5k Rated• Up to 7 feed troughs (1/4” lines)

Ullrigg Stack-Up Test Achievements

√• Convey “Perf Valve Liner” w/ timed connection and dual control line. Set hanger, simulated cement job and actuated perf valve pistons

• Run upper completion w/dual control line. Oriented and connected the wet connect. Function tested the Expansion Joint and set the packer.

√√

• Deployed Optical Fiber to the toe of well and back to surface. Logged temperature as function of depth

√• Opened Perf Valve sliding sleeve, ruptured disc’s and simulated fracturing job

å Released the Packer and retrieved upper completion, pulled lower completion

System Benefits

Perf Valve: DTS:• Initial Installation:

− Allows DTS deployment

•Stimulation− Increased Proppant size− Eliminate Perforating− Selective stimulation

•Zonal Isolation−Reduce Chalk influxes−Water shut-off−Remedial work−Selective production

•Flow into liner− Production− Water breakthrough− Gas lift monitoring

• Flow out of liner− Injection− Stimulation− Scale squeezes

Implementation• Staged approach

– Control new elements and associated risks– Prove Perf Valve functionality first

PV redesign

Packer design

Exp Joint

Connection &flatpack design

Stack-up Test10-14/3 ’03

Q4/02

Q1/03

Q2/03

Q3/03

Q4/03

Q1/04

Q2/04

Time

Task

Q4/02

Q1/03

Q2/03

Q3/03

Q4/03

Q1/04

Q2/04

DTS Implementation

PV Implementation