Ensuring integrity of shale gas wells in Europe
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1 M4Shale Gas Final Conference, Krakow, Poland Ensuring integrity of shale gas wells in Europe M. Torsæter, K. Gawel, J. Todorovic, A. Stroisz, R. Skorpa and A. Lavrov SINTEF Petroleum Research, Trondheim, Norway
2 Wells are most probable leakage paths! Well integrity closely correlated to public 2 acceptance!
3 Well integrity: From drilling to plugging Drilling Cementing Operations Plugging 3
4 Well integrity: From drilling to plugging Drilling Cementing Operations Plugging 4
5 Depth Shale drilling hazards Narrow mudweight windows Pressure Unavoidable geological issues: Natural fractures Elevated pore pressures Sharp pressure changes Laminated rock Reactive clays Documented: Borehole instability Poor hole cleaning, strong torque & drag on pipe, packoffs, bit balling, low rates of penetration, casing placement probs. Gas influx during drilling Stuck pipe, gas influx Lost circulation, fracturing Lost circulation, formation fracturing higher up in hole (last casing point) Use oil-based mud, perform thorough 5 PRD: Methods for better understanding in-situ conditions (including 3D mapping of fractures) characterization of both reservoir and overburden
6 Well integrity: From drilling to plugging Drilling Cementing Operations Plugging 6
7 Shale cementing problems Documented: Naturally fractured laminated rock (anisotropic stresses) Loss of cement Boreholes are rarely circular (breakouts) Poor mud displacement Reactive clays: Casing cemented off bottom High pore pressures: Gas migration through cement during setting 7 PRD: Develop log/method that can verify cement barrier sealing ability. Use centralizers, tailor cement/mud/spacer properties, log frequently.
8 Well integrity: From drilling to plugging Drilling Cementing Operations Plugging 8
9 Documented: Shale well operational damage Pipe corrosion/erosion. Sustained casing pressure due to mechanical damage to cement after setting. Casing diameter changes Formation motion Casing deformation (well intersects plane on which displacement is induced during production: weakness, fracture, fault) 9 PRD: Enable continuous non-invasive well integrity monitoring Tailor barrier materials, continuously monitor sustained casing pressure
10 Well integrity: From drilling to plugging Drilling Cementing Operations Plugging 10
11 Shale well long-term safety Documented: Degradation of well Cement from well plug placed in 2013, cored in 2015 Microscopy study of pipes barrier materials. Poor quality of plugs. Reference 521 m Methane leakage to Inside tubing Inside casing Outside tubing Outside casing tubing casing surface. Global differences in plugging standards. It is still unknown how leakage rate development varies with time. 522 m 523 m Find out what works: Pores Contamination Cement Perform leakage monitoring at well site 11 K.Gawel et al., Study of materials retrieved from a Ketzin CO 2 monitoring well, Energy Procedia (2017) PRD: Ways to assess and remediate plugged wells after plugging.
12 12 Prediction of problems in Europe
13 Well Integrity predictions for European shales Upper Ordovician & Silurian shales in the Baltic- Podlasie-Lublin Basin Haynesville Marcellus Borehole instability Lost circulation during drilling/cementing Bit balling, poor hole cleaning and packoffs due to high clay content Cement integrity problems due to high temperatures and great depth Midland Valley Bowland shale Weald/Wessex Basin Barnett Haynesville Shallow gas influx during drilling Poor performance of water-base mud. Problems getting casing to bottom. Incomplete cementing Influxes and lost circulation in shale. Poor hole cleaning. Sustained casing pressure. 13
14 General recommendations General: Data sharing is necessary, we need openness about successes and failures in the field. Know the subsurface: Thorough characterization of not only reservoir but also overburden. Do it right the first time: Implement best drilling practices. Think about the whole well life cycle when chosing fluids and materials. Always try to improve: We suggest several Prioritized Research Directions (PRDs) for improving well integrity in shale gas wells. 14
15 Thank You For Your Attention! Contact: Malin Torsæter, SINTEF Petroleum Research 15
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