Corrosion Inspection of Surface casing and Conductors of offshore wells with the D-PEC technology. TÜV Rheinland Sonovation

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1 Corrosion Inspection of Surface casing and Conductors of offshore wells with the D-PEC technology TÜV Rheinland Sonovation

2 Introduction to TÜV Rheinland Group A leading provider of test, inspection and conformity services worldwide Founded in 1872 and headquartered in Cologne (Germany) Employees: about Network: > 500 branches in 66 countries world-wide Group annual revenues 2014: 1.73 billion

Introduction to TÜV Rheinland Sonovation Advanced NDT

Emission, Corrosion mapping, Pulsed Eddy Current

corrosion mapping inspections - DPEC offshore well

Audits Accredited AUT training and Level III services

3 Introduction to TÜV Rheinland Sonovation Advanced NDT services - AUT (TOFD, Phased Array), Acoustic Emission, Corrosion mapping, Pulsed Eddy Current Special ANDT Services - High temperature weld and corrosion mapping inspections - DPEC offshore well inspections - Application development, Modelling, Audits Accredited AUT training and Level III services Research and Development 3 29/09/2015 Company Introduction TÜV Rheinland Sonovation

4 Problem statement Corrosion may weaken the surface casing and conductor so that it no longer can carry it s design load and collapse Collapse of Offshore Wells due to corrosion of Surface casing 4 29/09/2015 Company Introduction TÜV Rheinland Sonovation

measurements on hundreds of wells: Corrosion did not seem to correlate directly with the age of the well There is no

5 Corrosion at Surface Casing and Conductor Concentrated near the fluid interfaces within the D-annulus (Region between the highest (HAT) and lowest astronomical (LAT) tide) Top side of the well (cemented wells, moisture) Results from DPEC measurements on hundreds of wells: Corrosion did not seem to correlate directly with the age of the well There is no correlation between corrosion on the conductor and corrosion on the surface casing and there is also no correlation between wells of the same platform.

6 Offshore Well Inspection approach Wellhead gap measurement Camera inspection D PEC wall thickness measurements Fluid water samples Well Integrity calculations 6 29/09/2015 Company Introduction TÜV Rheinland Sonovation

7 Wellhead Gap measurement logsheet 7 29/09/2015 Company Introduction TÜV Rheinland Sonovation

casing with conductor -Centralisers available -Controller

8 Camera inspection Eccentric casing with conductor Thick layer Corrosion product/cement on conductor -Eccentric casing with conductor -Centralisers available -Controller DPEC probe 8 29/09/2015 Company Introduction TÜV Rheinland Sonovation

9 D-PEC Well inspections

PEC uses a probe that generates a pulsed magnetic field.

10 PEC introduction PEC technology is an established solution for corrosion detection on the surface casing and conductor of offshore wells. PEC (pulsed eddy current) is an electromagnetic technique for measuring the thickness of steel objects. PEC uses a probe that generates a pulsed magnetic field. The characteristics of the eddy currents induced in the steel are measured to determine the thickness of the steel. No surface preparation required Collapsing primary field induces eddy currents, distributes in material and generates a secondary magnetic field

11 Inspection of the D-annulus 11 29/09/2015 Company Introduction TÜV Rheinland Sonovation

12 Access Solution: Pulsed Eddy Current (PEC) X-mas tree PEC tool Up to 60 m Sea level PEC cable Probe Air tube Balloon Outer casing Inspection area 12 29/09/2015 Company Introduction TÜV Rheinland Sonovation

13 Standard measurement intervals 13 29/09/2015 Company Introduction TÜV Rheinland Sonovation

14 PEC reading [mm] Fluid level 2009 HAT LAT PEC reading [%] Result well TRS 23, platform XYZ (not cemented) Platform XYZ- Well TRS-23-20" Casing PEC wall thickness measurements D-PEC Nov 2007 (NW) 40 2 D-PEC June 2009 (NW) D-PEC July 2012 (SE) Distance from top of Conductor [m] 14 29/09/2015 Company Introduction TÜV Rheinland Sonovation

15 PEC reading [mm] Fluid level 2009 HAT LAT PEC reading [%] Result well TRS 23, platform XYZ (not cemented) Platform XYZ- Well TRS-23-30'' Conductor PEC wall thickness measurements D-PEC July 2006 (SW) D-PEC June 2009 (NW) D-PEC July 2012 (SE) Distance from top of Conductor [m] /09/2015 Company Introduction TÜV Rheinland Sonovation

16 Result Well XX Cemented to main sea water level UA-52 Casing WT loss [%] October 2013 (S) Min. Wt [mm] Depth of Min. Wt [m 1.0 Depth of Survey [m] /09/2015 Company Introduction TÜV Rheinland Sonovation

17 Result Well XY cemented to main sea water level UZ-194 Casing WT loss [%] September 2013 (S) Min. Wt [mm] Depth of Min. Wt [m 5.0 Depth of Survey [m] /09/2015 Company Introduction TÜV Rheinland Sonovation

18 Conclusions Extend the lives of the offshore assets and onshore plants. Proactively and easily check for casing corrosion without interrupting production. Advanced knowledge of well integrity enables better planning of production and well abandoning activities. Saved production and avoidance of unnecessary, costly remediation on non-corroded wells. Regular health checks of the corrosion status of wells will also help operators to plan more targeted and cost-effective workover programs. Focus on those wells that require urgent attention and remedial action. Considerable reduction of health, safety and environmental risk /09/2015 Company Introduction TÜV Rheinland Sonovation

TÜV Rheinland Sonovation BV Elschot 30 4905 AZ Oosterhout The Netherlands Tel: +31 162425588 E-mail: ndt@tuv.com www.tuv.com/ndt Contact: Mr.

19 TÜV Rheinland Sonovation BV Elschot AZ Oosterhout The Netherlands Tel: Contact: Mr. Fred Gabriëls Phone: D-PEC animation movie is on YouTube. Search on D-PEC

Pulsed Eddy-Current (PEC) Inspection through Insulation

INDUSTRIAL SERVICES WHITE PAPER PULSED EDDY CURRENT Pulsed Eddy-Current (PEC) Inspection through Insulation Method statement of an advanced non-destructive testing technique for inspection through insulation.