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Tensile strength of cement to shale interface

Sammendrag

Permanent CO2 sequestration relies on avoiding leakage from the reservoir through the caprock.
The highest leakage risk resides at the wells penetrating the reservoir, in particular at the boundary between cement sheath and formation.
Models quantifying the risk of cement debonding require the cement-caprock interface tensile strength as an input parameter.
An experimental method is elaborated to measure tensile strength of composite shale/cement plugs created under stress and temperature conditions similar to downhole well conditions.
Tensile failure always occurs at the cement/shale interface and the interface tensile strength is usually significantly lower compared to reservoir rock or cement bulk tensile strength.

Kategori

Vitenskapelig Kapittel/Artikkel/Konferanseartikkel

Oppdragsgiver

  • Research Council of Norway (RCN) / 257579

Språk

Engelsk

Institusjon(er)

  • SINTEF Industri / Petroleum
  • SINTEF Industri / Materialer og nanoteknologi

År

2019

Forlag

American Rock Mechanics Association (ARMA)

Bok

Proceeding of 53th US Rock Mechanics / Geomechanics Symposium

ISBN

978-1-5108-9406-8

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