Open Access

ARTICLE

Experimental Evaluation of the Mechanical Properties of Cement Sheath under High-Temperature Conditions

by Pei Zou¹, Zhiqiang Huang^1,*, Yian Tong², Leichuan Tan³, Rui Li⁴, Kai Wei^1,5, Deng Qiao^1,*

1 Yangtze University, Wuhan, 430199, China
2 Downhole Service Company, CNPC Chuanqing Drilling Engineering Co., Ltd., Chengdu, 610052, China
3 Chuanxi Drilling Company, CNPC Chuanqing Drilling Engineering Co., Ltd., Chengdu, 610051, China
4 China National Logging Corporation Southwest Branch, Chongqing, 401147, China
5 China University of Geosciences, Wuhan, 430074, China

* Corresponding Authors: Zhiqiang Huang. Email: ; Deng Qiao. Email:

(This article belongs to the Special Issue: Meshless, Mesh-Based and Mesh-Reduction Methods Based Analysis of Fluid Flow in Porous Media)

Fluid Dynamics & Materials Processing 2022, 18(3), 689-699. https://doi.org/10.32604/fdmp.2022.019470

Received 26 September 2021; Accepted 11 November 2021; Issue published 22 February 2022

Abstract

The sealing integrity of cement sheath in offshore wells is seriously threatened under high-temperature conditions, resulting in gas channeling and other problems. Given the lack of experimental results, in this study relevant samples of a cement slurry sealing section of a typical offshore high-temperature well have been prepared and analyzed. In particular, the mechanical properties have been assessed with a triaxial pressure servo instrument and a high-temperature curing kettle. The density and the Poisson’s ratio of the samples have also been tested. The stress-strain curve has been drawn to obtain the elastic modulus and the compressive strength. The rock brittleness index has been calculated according to the measured elastic modulus and the Poisson’s ratio, together with the brittleness and the compressibility of the cement samples. The test results show that the mechanical properties and bonding strength of the cement samples are optimal at 130°C, medium at 150°C, and poor at 180°C.

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Keywords

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