Barrier verification and leakage risk. Dave Gardner, IRIS Norwegian Oil and Gas Plug & Abandonment Seminar October 18 th 2017

Transcription

1 Barrier verification and leakage risk Dave Gardner, IRIS Norwegian Oil and Gas Plug & Abandonment Seminar October 18 th 2017

2 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

3 Drilling and Well Centre for Improved Recovery DrillWell ( ) Vision; Unlock petroleum resources through better drilling & well technology Main Topics; Drilling process optimization Well control Cement integrity Plug & abandonment

4 Technologies for barrier evaluation and P&A Challenge; Annular isolation must be verified in order to select the best P&A solution Objective; Investigate the performance of barrier verification technologies: Logging through multiple tubulars Cement evaluation logs Other barrier verification techniques Method; Construct barrier reference cells and investigate the ability of logs to predict the barrier quality CBL/VDL Log

5 Pilot phase 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

6 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)

7 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"

8 PILOT logging experiment Baker Hughes Segmented Bond Tool SBT & INTEX Logs in air & water, with / without holes, control lines Demonstration of industry interest

9 Visuray VR360 proof of concept experiment Cement mapping using back scatter from high energy 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

10 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

11 Test matrix / block design

12 VR360 results snap shot Defects embedded in the cement identified Defects detected with and without a microannulus Results courtesy of Visuray

13 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

14 Leakage risk for permanently P&A d wells 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 of leakage probability and future leakage rates Quality measure to compare different P&A designs Software prototype ready for testing end 2017

15 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, 1 st displacement experiment end October "Commercial" projects in planning phase Working on Centre financing

16 Acknowledgements