MILLINGSOLUTIONS

LOWER COST,REDUCED CAPEX,HIGHER PRODUCTION – ABSOLUTELY.

3

SERVICE OFFERINGSBEST IN CLASS

Deferred or reduced production is never welcome. When the cause is scale build-up or downhole obstructions, Welltec’s milling solutions can bring wells back on-line fast and efficiently. Deployed on e-line, these modular tools have proven to be robust and effective in removing obstructions with robotic precision across diverse environments including horizontal wells.

Range of services: ∙ Scale milling ∙ Flapper valve milling ∙ Glass plug milling ∙ Nipple profile milling ∙ Enlargement of buckled tubing ∙ Isolation valve milling ∙ Bridge plug removing

EXPLORE YOUR OPTIONS!

MILLING SOLUTIONS

4 5

CORE BIT WIRE BITFULL BORE BIT

The Well Miller® for Scale Removal trans-forms the power of the Well Miller® into a solution for removal of accumulations which can’t be removed effectively with brushing.

The Full Bore Bit is ideal for attacking layers of scale that are severely reducing the well-bore ID and impacting production. It is de-signed to mill through substantial amounts of build-up and restore the tubular to full bore.

The Scale Core Bit is designed for shavingscale sheathes from inner walls with diamond tipped finesse. With a tighter tolerance to fit the ID, it is a perfect solution for removing scale patches over long intervals.

The Wire Bit is developed specifically for milling scale that has settled on or insidevalves within the wellbore. It is built toattack scale in irregular holes, depressionsand upsets.

Scale milling with the Well Miller® is run incombination with the Well Tractor® to applyweight-on-bit as necessary and to counterreactive torque.

Types of jobs

Removal of ∙ Scale ∙ Cement ∙ Salt ∙ Sulfates ∙ Hydrates ∙ Calcite

TOOLS MILLING SOLUTIONS

WELL MILLER® FOR SCALE REMOVAL

SPECIFICATIONS WELL MILLER® FOR SCALE REMOVAL

20 kpsi 25 kpsi

2 1/8” 3 1/2”BODY TOOL OD

10 ft 12.2 ftLENGTH

70 lbs 95 lbsWEIGHT IN AIR

2.25” 7”

36,000 lbs 42,000 lbsTENSILE STRENGTH

30,000 lbs 50,000 lbsCOMPRESSIVE STRENGTH

MAX. WELL PRESSURE

302°F 338°FMAX. TEMPERATURE, UP TO

BIT SIZES

6 7

PRNPR

TOOLSMILLING SOLUTIONS

WELL MILLER® FOR HARDWARE MILLINGThe Well Miller® for Hardware Millingprovides operators with a better way torepair wells with mechanical problems. Historically, interventions to remove plugsor mill through nipples had been limitedto the use of heavy, expensive equipment.Now there is a lightweight, e-line conveyed,reliable alternative.

The Well Miller® Nipple Profile Removal (NPR) tool increases the ID of a nipple profile, providing increased production andaccess to the wellbore below for tools withlarger diameters. The tool can also be ap-plied to open up pipe or tubulars which

have partially collapsed. Operations havebeen successfully performed on nipplesof high tensile steel, chrome, and superchrome.

The Well Miller® Plug Removal (PR) tool is a powerful solution for removingfaulty or temporary, cast iron or com-posite plugs in the wellbore.

Hardware milling with the Well Miller® is run in combination with the Well Tractor® to apply weight-on-bit as neces-sary and to counter reactive torque.

Types of jobs ∙ Nipple profile milling ∙ Cement plug milling ∙ Bridge plug milling ∙ Enlargement of buck tubing ∙ Glass plug milling

SPECIFICATIONS WELL MILLER® FOR HARDWARE MILLING

20 kpsi 25 kpsi

2 1/8” 3 1/2”BODY TOOL OD

10 ft 12.2 ftLENGTH

70 lbs 95 lbsWEIGHT IN AIR

2.25” 6.1”

36,000 lbs 42,000 lbsTENSILE STRENGTH

30,000 lbs 50,000 lbsCOMPRESSIVE STRENGTH

MAX. WELL PRESSURE

302°F 338°FMAX. TEMPERATURE, UP TO

BIT SIZES

8 9

FEATURES

∙ E-line conveyed milling system ∙ Weight on bit control ∙ Control of reactive torque ∙ No circulating systems required ∙ Very low risk of reservoir damage ∙ Improved depth determination ∙ Passive fail-safe system

BENEFITS

∙ Reduced personnel ∙ Reduced heavy lifts ∙ Cost-effective ∙ Minimum logistics ∙ Returns well to production faster ∙ Reduced risk of damaged tubulars ∙ Reduced risk of fishing ∙ Increased flexibility

KEYHOLE SURGERY

A main feature of Welltec’s solutions is the ability to deliver heavy duty results with roboticprecision. This enables operators to apply surface-monitored and controlled applicationsto a specific and predetermined part of the well, reducing the risk of damaging the well-bore, providing safer operations and enabling future interventions. As a result, reservoirdrainage is optimized and the economic lifespan of wells and fields is prolonged.

ENVIRONMENTAL BENEFITS

One of Welltec’s key values is to provide solutions that minimize negative impacts on the environment. This is achieved by building small equipment for performing interventions, resulting in less emissions and a reduced carbon footprint. Welltec’s solutions can even be transported by helicopter minimizing both impact on the environment and mobilization time.

INHERENTLY SAFER OPERATIONS

As a company, Welltec® continuously strives to increase safety. During operations, thistranslates into using fewer people, requiring a reduced number of lifts and eliminatingthe need for explosives. At locations with limited space, such as small off-shore platforms,between decks, and Light Intervention Vessels, Welltec’s e-line solutions offer improvedlogistics and reduced safety risks.

ADVANTAGESHEAVY INTERVENTIONS WITH A LIGHT TOUCH

10 11

BSRVR

The Well Miller® for Valve Open-ing restores production to wells with malfunctioning valves. When a control line fails or a valve doesn’t open, it af-fects both production and wellbore ac-cess below the valve. Welltec® offers a solution to restore the flow path.

The Well Miller® Valve Removal (VR) tool can rapidly mill through flapper valves, half and full-ball valves and isolation valves made of high tensile steel, chrome, super chrome, and incoloy and inconel to establish or increase production.

The Well Miller® Ball Seat Removal (BSR) tool has been designed especially for milling out balls and ball seats to increase flow and allow access to lower completions. Welltec® has successfully milled out balls and ball seats made of cast iron and composite materials.

Valve opening operations with the Well Miller® are run in combination with the Well Tractor® to apply weight-on-bit as necessary and to counter reactive torque.

Types of jobsMilling of ∙ Flapper valves ∙ Isolation valves ∙ Half-ball valves ∙ Full-ball valves ∙ Balls and ball seats ∙ Glass plugs

TOOLSMILLING SOLUTIONS

WELL MILLER® FOR VALVE OPENING

SPECIFICATIONS WELL MILLER® FOR VALVE OPENING

20 kpsi 25 kpsi

2 1/8” 3 1/2”BODY TOOL OD

10 ft 12.2 ftLENGTH

70 lbs 95 lbsWEIGHT IN AIR

2.25” 6.1”

36,000 lbs 42,000 lbsTENSILE STRENGTH

30,000 lbs 50,000 lbsCOMPRESSIVE STRENGTH

MAX. WELL PRESSURE

302°F 338°FMAX. TEMPERATURE, UP TO

BIT SIZES

12 13

YOU CAN HAVE THE MOST DIFFICULT OBSTRUCTIONS – WE’LL REMOVE IT WITH A DOWNHOLE MACHINE SHOP

14 15

CUSTOMIZEDSOLUTIONS ADAPTED TOTHE SPECIFIC WELL ENVIRONMENT

Each and every well is unique. Perhaps the hardware which goes into the well is the same, but the reservoir encountered, the forces put on the completion during installation, the varia-tion in the drilling and completion fluids, and so forth combine so that each well has a unique nature. Welltec® recognizes this and proudly compensates for it by providing the capability to tailor solutions to fit the characteristics of each specific well. Each job is pre-planned usingcustom software to model the potential environment and then the results are used to ensureproper tool design. For milling solutions, system integration tests (SITs) are a standard part of ensuring that the designed solution will be effective upon implementation. Perhaps the most important aspect is Welltec’s experience. For years Welltec® has been successfully apply-ing milling solutions to clean scale, open faulty or malfunctioning valves, and remove plugs and obstructions. Experience combined with flexibility and a drive to excel ensures success.

16 17

BALL CATCHER SUB MILLING ON E-LINE

In Canada a dual lateral, open hole, multi-stage well was experiencing problems with a ball catcher sub suspected of restricting production. Capitalizing on our track record, Welltec® was contacted for a swift resolution that would not damage the fluid sensitive formation. The Well Tractor® 218 and a Well Miller® 212 Ball Seat Removal (BSR) milled out the ball catcher sub in one fourth of the time it would have taken alternatvesolutions. The operator also asked to mill out the ball seat, which was done in the same run using the same toolstring.MIL.ON.CA.12.01.V1

MILLING FLAPPER VALVE IN 20 MINUTES SUBSEA

In Equatorial Guinea, an aluminum flapper valve needed to be opened, but despite multiple pressure cycles, the valve remained closed. Due to the estimated volume required, the operator did not want to use acid to disintegrate the valve. Thus a Well Miller® fitted with a custom tungsten carbide bit was mobilized. The bit was designed to prevent the flapper valve from opening when pulling back. After just 20 minutes the flapper valve was successfully milled through. MIL.SUB.AF.12.03.V1

CASE STORIESFOR MILLING SOLUTIONS

WORLD´S FIRST NIPPLE PROFILEMILLING WITH 218 E-LINE TOOLS

Offshore Norway, an operator needed to remove a restricting nipple profile to run an inflatable plug. Welltec® was selected due to our track record of precision milling. Thorough pre-job planning was done before mobilizing the Well Tractor® and Well Miller® NPR. Two custom bits were manufactured and the toolstring passed successfully through the nipple profile using only the first. Using e-line equipment, the operator removed the restriction, set a straddle packer and restored the well to production in just a few short days.MIL.OFF.NO.13.02.V1

MILLING DEEP-SET PLUG BULLNOSEON E-LINE, RLWI

An operator wanted to regain communication with the lower zone to increase production in a North Sea subsea well. It was shut off by a retrievable bridge plug that was elected not to be retrieved to surface due to risk of sticking. After the original plan to release it failed, the team decided to mill through the bridge plug and Welltec® delivered a swift, tailored solution. The operation was a world’s first, performed as RLWI, successfully reestablishing communica-tion with the lower zone and increasing oil production significantly.MIL.ON.US.12.5.V1

WITH PROVEN RESULTS IN A WIDE VARIETY OF ENVIRONMENTS AND THE ABILITY TO TAILOR SOLUTIONS TO YOUR NEEDS, WELLTEC® OFFERS A FAST, EFFICIENT OPTION FOR ENABLING INITIAL PRODUCTION OR RETURNING WELLS TO FULL POTENTIAL AS ILLUSTRATED BY THE FOLLOWING CASE STORIES.

18 19

WELL MILLER REPLACES RIG WORK OVER

When a well was deemed ‘inoperable’ due to a leak below a frac sleeve, innovative thinking was required. The sleeve had been stuck in the SSSV for 22 years despite attempts by CT and slickline to remove. Different solutions for the Well Miller® were tested before settling on a core drill bit with a built-in centralizer. After 4 1/2 hours of milling, the frac sleeve retain-ing material was completely removed and it was successfully pulled. The effectiveness and small footprint saved about 96% in costs and six days of time compared to a rig workover. MIL.ON.US.12.5.V1

RIGLESS INTERVENTION ACCELERATES PRODUCTION

For two wells, offshore Malaysia, the operator called Welltec® to overcome downhole challenges. In the first well a cement wiper plug obstructed the ability to perforate. The Well Stroker® pushed it through a nipple and then the Well Miller® freed it in order to push it to the bottom, accessing the required zone. On the second well, a poor cement job made the primary target zone inaccessible.Using the Well Tractor® and Well Miller® the obstruction was pushed down allowing for sidetracking and further reservoir access. MIL.OFF.MA.12.01.V1

AN UNUSUAL CATCH: FISHING CABLE WITH THE WELL MILLER®

An operator offshore Equatorial Guinea had to recover a dropped toolstring and about 2,600 ft. of cable from a well. Slickline had recovered approximately half of the cable but had been unable tomake any further progress or getting below 9,500 ft due to a plugof cable and some fine sandy emulsion. The Well Miller® ‘drilled out’some of the cable and sand plug, capturing it as well as breakingit up. The well was cleared down to 12,700 ft and returned toproduction.MIL.OFF.AF.12.01.V2

NORTH AFRICA FLAPPER VALVE MILLING

A 54° deviated, dry, gas well experienced a malfunctioning downhole flapper valve. Intervention was complicated by limited access, tem-peratures up to 303°F, 4% H2S and 4 mol% CO2 content in addition to low reservoir pressure. The operator turned to Welltec® to open the flow path. Welltec® mobilized a Well Tractor® 318 and a Well Miller® 318, which successfully milled through the flapper valve in ~ 40 minutes without introducing fluids. Then, a Welltec Access Sleeve® (WAS) was set in the milled out flapper to ensure easy entry/reentry.MIL.OFF.TN.12.06.V1

20 21

MILLING IRON SULFIDE SCALE

An operator needed to set a retrievable bridge plug to perform well head maintenance in a well with high levels of H2S. Iron sulfide scale buildup prevented the plug from reaching target depth. Welltec® dispatched a Well Tractor®, Well Miller® for Scale Removal and several, custom milling bits. Working in a dry environment, the Well Miller® and the Well Tractor® removed 1,700 ft of iron sulfide scale in one day. The same e-line unit was used to set the bridge plug, reducing costs and carbon footprint versus conventional operations.MIL.ON.CA.12.04.V1

IN-SITU BALL SEAT MILLING

A ball seat (3.5” ball with 3.275” seat) was run in a comple-tion in the North Sea. The ball and seat required removal after the stimulation job for which the Well Tractor® and Well Miller® were deemed the best solution. As this was the first time a ball seat of this type was to be removed by e-line milling, the op-eration was carefully tested onshore. The ball and ball seat, which was located at 12,647 ft MD, were successfully removed in one run with a total milling time of only 15 minutes. MIL.SUB.NO.11.03.V1

SIX MINUTE NIPPLE MILLING

Welltec® was tasked by a major operator to mill a nipple pro-file from 3.75” ID to 3.80” ID. After weeks of planning, the first field profile milling was performed in Alaska. After only six min-utes of downhole milling with the Well Miller® NPR, the milling bit had successfully broken through the nipple profile. The milled out spot was then drifted with the same toolstring, passing 10 ft of tool through the nipple, before recovering it to surface.MIL.ON.US.11.04.V1

MORE CASE STORIES CAN BE FOUND AT WWW.WELLTEC.COM/MILLING SOLUTIONS

SPE PAPERSON MILLING SOLUTIONS

22 23

SPE – 130708 Nipple Profile Milling with Electric Wireline by Brian Schwanitz, Antonius Aji and Joe Collins , Welltec®, presented at the SPE/ICoTA, The Woodlands, TX, 2010.

SPE – 121539 Successful Milling and Removal of a Permanent Bridge Plug with Electric Line Tractor Conveyed Technology by Stephen Stragiotti (StatoilHydro) and Ole Edvin Karlsen, Welltec®, presented at the SPE/ICoTA, The Woodlands, TX, 2009.

SPE – 119382 Electric Wireline Milling - New Solutions for New Challenges by Bob Joyce, Welltec®, presented at the SPE/IADC, Amsterdam, 2009.

SPE – 179047 New Method for Milling Flapper Valves on E-line in Dry Environments by Almir Dulic, Welltec®, presented at SPE/ICOTA in Houston, TX, 2016.

SPE – 179103 Downhole Machining with Electric Wireline Technology by Irwin Bermawan, Indah Primasari, Risal Rahman and Ramadhani Rachman, Total E&P Indonesia, Vera Carolina and Rigel Aldebaren, Welltec®, presented at SPE/ICOTA in Houston, TX 2016.

SPE – 173657 Milling Faulty Lubricator Valve Using Innovative E-Line Conveyed Core Bit by Wong Chun Seng, Bryan Maitland, Jagdish Singh, Joint Development Area Operating Company; Mohamed Ibrahim Elnaeim, Welltec® presented at the SPE/ICoTA held in Woodlands, Texas, 2015.

SPE – 166922 E-line ‘Heavy’ Workovers in High LatitudeEnvironments by Brian Sidle, SPE, Rick Crist, Kirill Kir sanov,Igor Novikov, Jeremy Albright, SPE, Jeremy Ray, Welltec® presented at the SPE Arctic and Extreme Environments Conference & Exhibition held in Moscow, 2013.

SPE – 163939 Electric-Line Milling System Removes Stuck Frac Sleeve without Damaging the Subsurface Safety Valve Landing Nipple by Josiah Igwe, BP; Carl Diller and Robert (Bob) Harris, Northern Solutions; and Jeremy Albright and Jesper Lykkebo, Welltec®, presented at the SPE/ICoTA, The Woodlands, TX, 2013.

SPE – 162720-PP Recent Achievements within Electric LineMilling by Anthony MacLeod; James Greenlee, SPE, Kristine Henriques, SPE, all Welltec®, presented at SPE Canadian Uncon-ventional Resources Conference held in Calgary, Alberta, 2012.

SPE – 154405 Milling of an Electric Line Obstruction withElectric Line Conveyed Technology by Almir Dulic, Welltec®,Bruce McIninch and Mickey Mullin, Marathon Oil Corp pre-sented at the SPE/ICoTA, The Woodlands, TX, 2012.

IPTC – 14585 A Pragmatic Approach to Enhanced Performance of Slim Mono-Bore Wells by Lam Fei Shiong, Welltec®, presented at the IPTC, Bangkok, 2011.

SPE – 143358 Light Well Intervention Scale Milling Enables Reservoir Access By Bronson Larkins (BP) and Donald Mitchell, Welltec®, presented at the SPE/ICoTA, The Woodlands, TX, 2011.

SPE – 147674 Practical Aspects of In-Situ Ball Seat Millingby Helge Halvorsen and Michael Macdonald Arnskov, Welltec®,presented at SPE/ATCE, Denver, CO, 2011.

SPE – 143226 Riser Less Well Intervention for Subsea Work Over by Terje Skeie, Øyvind Hjorteland and Michael Macdonald Arnskov, Welltec®, presented at the Brazil Offshore, Macaé, 2011.

Copyright © 2017 Welltec A/SAll rights reserved. No part of this publication may be reproduced in any form without the written permission of Welltec A/S.Welltec, Well Tractor, Well Stroker, Well Key, Well Cleaner, Well Miller, Welltec Release Device, Well Cutter, Welltec Puncher, Welltec Flow Valve, Welltec Data Monitoring and Welltec Annular Barrier are trademarks of Welltec A/S and may be registered in Denmark and/or in other countries. All products are protected by patents or patent pending.