Environmental regulations in several key Oil& Gas Industry provinces have restricted theuse of traditional ‘pipe dope’ based OCTGprocesses. This situation, coupled with thedramatic reduction in wellbore & equipmentcontamination presented by use of emergingsurface treatments, led to the developmentof the Hunting Clear-Run® Advanced TubularSystem.

Technical Overview

From early 2001, Hunting Energy Services Internationalhas been working with technology partner organisationsR.S. Clare & Co Ltd and MP(Eastern)Ltd on thedevelopment and testing of Hunting Clear-Run®, thefirst commercially field proven Advanced Tubular Systemavailable to the Oil & Gas Industry, incorporating thefollowing technical features;

Zero Contamination of Down Hole Equipmentfrom OCTG Pipe Dope

Zero Well and Formation Contamination fromOCTG Pipe Dope

Controlled Make-Up and Breakout (withoutDope) with High Galling Resistance

Removal of Onshore and Offshore ThreadCleaning & Preparation Time/Cost

Advanced, Connection Life-Cycle CorrosionProtection

Minimised Residual Environmental Impact,Maximised Component Re-Cycling

Key Features

Anti Galling

Controlled Make-Up

P02 - Technical Overview - The Hunting Clear-Run™ Advanced Tubular System

In traditional OCTG processes, copper plating of thebox or couping end of the connection is used inconjunction with pipe dope on the threads to reducethe occurrence of galling at the make-up stage. Despitethis, galling still remains a risk, often accounting foran unacceptable reject rate in the field.

The development programme of the Clear-Plate® antigalling technology was initially intended to produce acoating that would be more resistant to disruption byconnection surface contact loads and pressures thantraditional copper coating.

Early variants of the alloy coating showed impressivegalling resistance and the product has now been furtherdeveloped to enable repeated running without theneed to use conventional API or “Green” dopes.

Extensive make and break testing has confirmed allaspects of the performance and reliability of theAdvanced Tubular System. (see Clear-Run® Test Datasheet 01

– Anti-Gall Properties of Clear-Plate™)

Extensive laboratory and field testing of Clear-Glide®in conjunction with Clear-Plate® produced similarfriction profiles to traditional copper / API dopecombinations.(see Clear-Run® Test Datasheet 03 – Make-up and Break-out Testing)

Corrosion Protection

The Clear-Glide® component of the system protectsthe pin threads and the Clear-Plate® electroplatedalloy, in conjunction with Clear-Glide®, protects thebox or coupling end. Used in combination, thesetechnically advanced products provide levels of corrosionprotection equivalent to in excess of traditional

Improved Field Performance

P02 rev1 - Technical Overview - The Hunting Clear-Run® Advanced Tubular System

Connection Performance

copper/dope based processes without the need forcleaning or re-application prior to shipping from thepipe yard and running in hole.

Experience of long term storage up to 24 months havebeen gained on Clear-Run® prepared tubulars thatwere taken immediately from stock and run at the wellsite with no indication of corrosion (Q1 ‘ 04) (see Clear-

Run® Case Study C01).

In field tests and offshore running, removing the needfor connection cleaning and dope application at thepoint of make-up increased the speed of deploymentof tubular strings to the well by up to 20% (see Clear-Run®

Case Study C01).

Laboratory and field testing has conclusivelydemonstrated Clear-Run’s resistance to petroleum-based solvents. The anti-gall performance of the Clear-Plate® coating, together with Clear-Glide® lubricantensures a consistent make-up in circumstances suchas base oil immersion when a traditional doped systemwould have severely deteriorated. (see Clear-Run® Test

Datasheet T-05 Field Running Trials).

Due to improvements in drilling technologies, therequirements placed on casing and tubing connectionsunder combined loads of tension and compression,internal, external pressure and bending have becomeincreasingly severe. The JFEBEAR premium connectionwas designed for use in such environments. JFEBEARClear-Run® has been successfully tested to a serviceenvelope based on ISO 13679 CAL IV loads and pressures.

During testing of the Clear-Run® system components,the most severe of operating environments wassimulated with no comprimise to connection integrityincluding:· Connection threads and seals manufactured to

extreme tolerances

· Application of Thermal Cycling with CombinedLoading Trials

· Combined Pressure Test with Axial Loading to95% pipe body VME.

(see Clear-Run® Test Datasheet T-05 Connection Load Testing to ISO

13679 Test Protocol).

Environmental FootprintThe overall Clear-Run® system dramatically reducesthe environmental impact of OCTG operations. Theremoval of pipe dope from the process significantlyreduces contamination of the workspace, well formationstructures and the general land/sea environment.

With the Hunting Clear-Run® Advanced Tubular System,Clear-Glide® has achieved the best possibleenvironmental performance under the UK Cefas ratingsystem and complies with the requirements on the“yellow” rating under Norway’s adoption of theHarmonised Offshore Chemical Notification Format(HOCNF). (see Clear-Run® Test Datasheet T-04 Independent

Environmental Impact Classification)

Health and Safety PerformanceThe Hunting Clear-Run® Advanced Tubular System hascreated a step-change in the way tubulars are preparedand run offshore. Clear-Run® improves safety andworking conditions both onshore and offshore, reducingslip/trip potential and as a “no intervention” systemreduces the potential for risks of other injuries whenrunning.

With Clear-Run®, all the above health, safety andenvironmental benefits are realised whilst improvingconnection performance and downhole well conditions.(see Clear-Run® Test Datasheet T-08 Health and Safety Performance of

Clear-Run®).

www.huntingclearrun.com