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Centroller
All materials used are suitable for sour gas environment except the coil springs. Grease points are located on each spring housing, allowing the space within the link carrier/spring housing assemblies to be packed with grease, protecting them from wellbore fluids.
Benefits• Extends the envelope for wireline-deployed high-deviation logging, mitigates the need for tractor- or pipe-conveyed wireline operations
• Smooth and constant downhole tool movement ensures high-quality data acquisition through wireline logging
• Reduces operational cost and risk significantly, compared to a pipe-conveyed logging operation
• Lower surface contact area of the downhole toolstring reduces risk of stuck tools
Reach further and get better logs with our CentrollerOur Centroller™ reduces toolstring friction extending the reach of wireline in high-deviation logging. An up to 50% reduction in friction mitigates the need for expensive tractor operations or pipe-conveyed wirelineoperations. The unique design ensures continuous tool centralisation ensuring the highest quality of log data is acquired downhole.
Features and Benefits
High accuracy: Create better logs and minimise mis-runs with our unique design. Equal spring force is applied to each annular link assembly, combined with the high manufacturing tolerance, provides accurate and reliable centralisation. Contrary to spring-bow centralising devises, the Centroller's alignment is independent of the link-assembly orientation and eliminates toolstring pivot points.
Drag reduction: Reach further with up to 50% reduced frictional drag.Unlike conventional centralisers, the Centrollerʼs contact with the casing bore is via a set of wheels within hinged links around the Centroller body.
Vibration reduction: Reduce damage to your toolstring and lower costs. Dual-spring loading on the Centroller link arm assemblies absorbsvibration and shock when traversing the well. This protects instruments from damage and increases tool reliability.
Robust and low maintenance: Simple, durable design minimisesmaintainence requirements and lowers your cost of ownership.
Centroller
Specifications
Partnumber
BodyOD (in.)
Bore(in.)
Casing size(in.)
Min dia over3/4 wheels (in.)
Max dia over3/4 wheels (in.)
Min - max diaof tool barrel (in.)
Make up length (in.)
Weight(lb)
Pressurerating (psi)
Temprange (°F)
016-920-002 5 7/16 3.665 6 5/8 – 9 5/8 5 7/16 9 7/16 3 3/8 - 3 7/8 34 1/2 80 Balanced -4/482
016-930-001 5 3/16 3.665 7 – 13 3/8 5 7/16 12 1/4 3 3/8 - 3 5/8 39 1/2 80 Balanced -4/482
016-928-001 5 3/16 1.250 4 1/2 – 9 5/8 3 1/2 9 1/8 In-line 44 1/4 45 19,000 -4/482
Link arm
• Low-friction wheels allow smooth travel at transition points and reduce drag
• Equispaced around tool body for even centralisation
Spring housing
• Incorporates interchangeable spring sets to provide accurate and positive centralisation in a range of casing sizes
• Absorbs vibration and shock whist travelling in casing
Centroller body
• Balanced design providing equalised external and internal pressure
• Pressure-rated design capable of withstanding downhole pressures
350
300
250
200
150
Casing ID (in.)
20 springs
17 springs15 springs
Centralising ForceCentroller Part No. 016.930.001 | Spring No. 011.218.00
Forc
e (lb
)
6 7 8 9 10 11 12 13
Centralisation force: The Centroller design incorporatessecondary and tertiary spring sets to provide high supportforces for heavy toolstrings in casing sizes from 7 to 13 3/8 in.
[email protected]@nov.com 3nov.com/elmar
Corporate Headquarters7909 Parkwood Circle DriveHouston, Texas 77036USA
Completion and ProductionSolutions Headquarters10353 Richmond AvenueHouston, Texas 77042USA
National Oilwell Varco has produced this brochure for general information only, and it is not intended for design purposes. Although every effort has been made to maintain the accuracy and reliability of its contents, National Oilwell Varco in no way assumes responsibility for liability for any loss, damage or injury resulting from the use of information and data herein. All applications for the material described are at the user’s risk and are the user’s responsibility.
©2020 National Oilwell Varco. All rights reserved.2531_ ENG_v02
Manufacturing Locations:
Elmar - UKTofthills Avenue Midmill Business Park Kintore , Aberdeenshire AB51 0QP, Scotland United KingdomT +44 1224 [email protected]
Elmar - USA 8017 Breen Road Houston, TX 77064 United States of America T +1 346 223 5000 [email protected]
Elmar - Singapore 7 Loyang WaySingapore 508721Singapore T +65 6546 [email protected]
Elmar - Canada (DynaWinch Products)6771 - 84 Street SE Calgary, Alberta T2C 4T6 Canada T +1 403 319 2333 [email protected]
Elmar - UAE Oilfields Supply Center B-17Jebel Ali Free ZoneP.O. Box 18633Dubai, United Arab EmiratesT +971 4 810 [email protected]
Regional Sales, Rental & Service Locations:
Al-Khobar, Saudi ArabiaT +966 13 835 [email protected]
Groot-Ammers, Netherlands T +44 1224 740261 [email protected]
Perth, AustraliaT +61 8 6279 5799 [email protected]
New Iberia, USAT +1 985-872-5215 [email protected]
Stavanger, Norway T +47 51 81 81 81 [email protected]
Representative Offices:
Beijing, ChinaT +86 10 5707 0900
Moscow, Russia T +7 495 287 2691
Port Harcourt, Nigeria T +234 908 781 0461
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