14-17 May 2018
New Orleans
US/Central timezone

Gas flow through corroded wellbore casing

17 May 2018, 13:30
15m
New Orleans

New Orleans

Poster GS 4: Porous media applications (renamed) Poster 4

Speaker

Ishtiaque Anwar (University of New Mexico)

Description

Leakage along wellbores is of concern for a variety of applications, including sub-surface fluid storage facilities, geothermal wells, and CO2 storage wells. We have investigated whether corroded casing is permeable to gas and can serve as a leakage pathway along the wellbore. Steel plates were corroded in corrosion reactor and sandwiched in a cylindrical assembly (140 mm long, 76 mm diameter), prepared from low permeability cement paste (permeability<10-18 m2). The test sequence comprised of single-phase gas flow measurements at different values of effective stress (range from 1 to 12.75 MPa)., Gas flow was interpreted as effective permeability and hydraulic aperture using the cubic law. Scanning electron microscope (SEM) images were used to estimate pore characteristics of the corrosion product. Tests under a range of gas pressures were used to account for non-linear flow. We found that the corrosion product was permeable to gas: permeabilities ranged from 10-14 to 10-16 m2 with corresponding hydraulic apertures of 5 to 20 μm. The permeability increased with the average thickness of the corrosion product. These results suggest corroded casing can serve as a significant leakage path along the axis of a wellbore.

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Primary authors

Ishtiaque Anwar (University of New Mexico) Mahya Hatambeigi (The University of New Mexico) Prof. Mahmoud Reda Taha (The University of New Mexico) Prof. John Stormont (University of New Mexico)

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