dave gardner, iris norwegian oil and gas plug & abandonment seminar …€¦ · dave gardner,...
TRANSCRIPT
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
Norwegian Oil and Gas Plug & Abandonment Seminar, October 18th 2017
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
Norwegian Oil and Gas Plug & Abandonment Seminar, October 18th 2017
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
Norwegian Oil and Gas Plug & Abandonment Seminar, October 18th 2017
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
Norwegian Oil and Gas Plug & Abandonment Seminar, October 18th 2017
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)
Norwegian Oil and Gas Plug & Abandonment Seminar, October 18th 2017
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"
Norwegian Oil and Gas Plug & Abandonment Seminar, October 18th 2017
PILOT logging experiment – Baker Hughes
• Segmented Bond Tool SBT & INTEX
• Logs in air & water, with / without holes, control lines
➢ Demonstration of industry interest
Norwegian Oil and Gas Plug & Abandonment Seminar, October 18th 2017
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
Norwegian Oil and Gas Plug & Abandonment Seminar, October 18th 2017
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
Norwegian Oil and Gas Plug & Abandonment Seminar, October 18th 2017
Test matrix / block design
Norwegian Oil and Gas Plug & Abandonment Seminar, October 18th 2017
VR360 – results snap shot
• Defects embedded in the cement identified
• Defects detected with and without a micro-annulus
Results courtesy of Visuray
Norwegian Oil and Gas Plug & Abandonment Seminar, October 18th 2017
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
Norwegian Oil and Gas Plug & Abandonment Seminar, October 18th 2017
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
Norwegian Oil and Gas Plug & Abandonment Seminar, October 18th 2017
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
Norwegian Oil and Gas Plug & Abandonment Seminar, October 18th 2017
Acknowledgements