Beschreibung
This paper presents the results of laboratory static and dynamic tests on casing-cement-rock systems exposed to axial loads under ambient conditions. A new testing method has been developed.Casing-cement-rock system mostly fails due to tension and shear stresses. In various applications such as HPHT, deep-water, (steam) injection or geothermal wells the cement-casing bond is exposed to cyclic thermomechanical loads resulting in casing elongation, contraction, expansion and subsequently in cyclic radial and axial stresses at the cement-casing-rock system. Cement is a brittle material which can fail when subjected to repeated application of stresses lesser in magnitude than the statically determined strength. A novel atmospheric test cell has been designed and constructed. In order to achieve the fatigue limits of the cement-casing bond, a set of testing procedures has been established. Several tests are conducted to evaluate de-bonding. The focus on de-bonding is achieved by allowing the casing to move through the test while preventing any cement movement. Thus, when a force is applied in the axial z-direction - either the casing is pulled (tension) out or pushed down (compression) - the casing has enough space to move in both directions. The advantage of this testing method is that Different stress ratio can be applied during the test.
Zeitraum | 16 Sept. 2020 |
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Veranstaltungstyp | Workshop |
Ort | San Diego, USA / Vereinigte Staaten, KalifornienAuf Karte anzeigen |
Bekanntheitsgrad | International |
Verbundene Inhalte
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Veröffentlichungen und Abschlussarbeiten
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Evaluation of Cement-Casing & Cement-Rock Bond Integrity during Well Operations.
Publikation: Konferenzbeitrag › Paper › Begutachtung