Cristin-resultat-ID: 1847332
Sist endret: 24. februar 2021, 14:01
NVI-rapporteringsår: 2020
Resultat
Vitenskapelig artikkel
2020

Can Heating Induce Borehole Closure?

Bidragsytere:
  • Xiyang Xie
  • Andreas Bauer
  • Jørn Stenebråten
  • Sigurd Bakheim
  • Alexandre Lavrov
  • Erling Fjær
  • mfl.

Tidsskrift

Rock Mechanics and Rock Engineering
ISSN 0723-2632
e-ISSN 1434-453X
NVI-nivå 2

Om resultatet

Vitenskapelig artikkel
Publiseringsår: 2020
Publisert online: 2020
Volum: 53
Sider: 5715 - 5744
Open Access

Importkilder

Scopus-ID: 2-s2.0-85090859987

Beskrivelse Beskrivelse

Tittel

Can Heating Induce Borehole Closure?

Sammendrag

The current study shows that heating a cased borehole in low-permeability shale rock can induce plastic deformation, leading to the closure of the casing annulus and decreasing annulus connectivity. The thermally induced borehole closure is interesting for the field operation of plug and abandonment (P&A), as it potentially saves operation cost and time by avoiding cutting casing and cementing. Lab experiments and numerical simulations are implemented to investigate the thermally induced borehole closure. Pierre shale and a field shale are tested. The lab experiments are performed by heating the borehole wall in a 10-cm-OD hollow cylinder specimen. Here, a novel experimental setup is applied, allowing for measuring temperature and pore pressure at different radii inside the specimen. Both the experimental data and the post-test CT images of the rock samples indicate the rock failure by borehole heating, and under certain conditions, heating results in an annulus closure. The decrease of hydraulic conductivity through the casing annulus is observed, but this decrease is not enough to form the hydraulic-sealed annulus barrier, based on the results obtained so far. Lab-scale finite-element simulations aim to match the lab results to obtain poro-elastoplastic parameters. Then the field-scale simulations assess the formation of shale barriers by heating in field scenarios. Overall, (i) the lab experiments show that heating a borehole can increase the pore pressure in shale and hence induce rock failure; (ii) the numerical simulations match the experimental results reasonably well and indicate that the heating-induced borehole closure can sufficiently seal the casing annulus in the field-scale simulation.

Bidragsytere

Aktiv cristin-person

Xiyang Xie

  • Tilknyttet:
    Forfatter
    ved Anvendt geovitenskap ved SINTEF AS

Andreas Bauer

  • Tilknyttet:
    Forfatter
    ved Aker BP ASA

Jørn Stenebråten

  • Tilknyttet:
    Forfatter
    ved Anvendt geovitenskap ved SINTEF AS

Sigurd Bakheim

  • Tilknyttet:
    Forfatter
    ved Anvendt geovitenskap ved SINTEF AS

Alexandre Lavrov

  • Tilknyttet:
    Forfatter
    ved Anvendt geovitenskap ved SINTEF AS
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