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Barrier verification and leakage risk

Dave Gardner, IRIS

Norwegian Oil and Gas Plug & Abandonment Seminar

October 18th 2017

Norwegian Oil and Gas Plug & Abandonment Seminar, October 18th 2017

Barrier verification and leakage risk

1. DrillWell; Drilling and Well Centre for Improved Recovery

2. DrillWell project; Technologies for barrier evaluation and P&A

3. Leakage risk assessment for plugged and abandoned wells

4. P&A Innovation Centre - status


Vision; Unlock petroleum resources through better drilling & well technology

Main Topics; Drilling process optimization

Well control

Cement integrity

Plug & abandonment

Drilling and Well Centre for Improved RecoveryDrillWell (2011 – 2019) http://drillwell.no/home

http://drillwell.no/home


Technologies for barrier evaluation and P&A

Challenge; Annular isolation must be verified inorder to select the best P&A solution

Objective; Investigate the performance of barrierverification technologies:

• Logging through multiple tubulars

• Cement evaluation logs

• Other barrier verification techniques

Method; Construct barrier reference cells andinvestigate the ability of logs to predictthe barrier quality

CBL/VDL Log


1. Dialogue with potential users

2. Use “Tubing Left In Hole (TLIH)” sections in a pilot phase:

• High quality start point

• Known leakage properties

• Reduce project risk

Sectioned TLIH test cells

Pilot phase


Reference cell design

• Test sections can be quickly rigged up

• Extensions as required for logging tool type

• Internal and/or annular pressure up to 2000 psi

• Annular fluid can be circulated (water, gas)


Reference cells

• Cement with drilled holes (5, 10, 15, 20 mm)

• Conventional cement with “micro-annulus”

• Gas channel – mid cement

• Cement with mud channel (in construction)

• Embedded control line

• Shale as a Barrier (design)

• Perf/Wash/Cement cells

• Test blocks for concept experiments

+"micro-annulus"


PILOT logging experiment – Baker Hughes

• Segmented Bond Tool SBT & INTEX

• Logs in air & water, with / without holes, control lines

➢ Demonstration of industry interest


Visuray VR360 proof of concept experiment

Cement mapping using back scatter from highenergy x-rays

• Directly measure the cement quality

• Can survey de-bonded casing where ultrasound can’t be used

• Investigate cement defects located away from the inner-casing

• Logging through tubing & casing


Objectives & set-up

Objectives

• Investigate measurement resolution

• Measure through a micro-annulus

Test setup

• Visuray VR360 mock-up

• Ullrigg HETE test pit (4000bar, 300°C)

• Safety plan, remote operation & safety interlocks


Test matrix / block design


VR360 – results snap shot

• Defects embedded in the cement identified

• Defects detected with and without a micro-annulus

Results courtesy of Visuray


Next phase of work

• Alternative P&A leakage testing methodologies

• Barrier verification experiments with other logging technologies

• Construct reference cells:

1. Shale as a barrier

2. PWC


Motivation;

Support field and well specific P&A solutions

Project objective;

Methodology for evaluating the barrier system quality for a PP&A well, expressed in terms ofleakage probability and future leakage rates

➢ Quality measure to compare different P&A designs

➢ Software prototype ready for testing end 2017

Leakage risk for permanently P&A’d wells


P&A Innovation Centre

Full-scale test facility for P&A operations for academic research and industrial applications

• Centre operations started (own risk)

• Cement displacement facility up and running, 1st displacement experiment end October

• "Commercial" projects in planning phase

➢ Working on Centre financing


Acknowledgements

dave gardner, iris norwegian oil and gas plug & abandonment seminar …€¦ · dave gardner,...

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