Volume 42 Issue 2
Apr.  2025
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LI Xiaojiang, WANG Yueyang, XIAO Jingnan, et al.Thermal damage of set silicate cement in ultra-high temperature xerothermic environment[J]. Drilling Fluid & Completion Fluid，2025, 42（2）：247-254 doi: 10.12358/j.issn.1001-5620.2025.02.013
Citation: LI Xiaojiang, WANG Yueyang, XIAO Jingnan, et al.Thermal damage of set silicate cement in ultra-high temperature xerothermic environment[J]. Drilling Fluid & Completion Fluid，2025, 42（2）：247-254 doi: 10.12358/j.issn.1001-5620.2025.02.013
shu

Thermal Damage of Set Silicate Cement in Ultra-High Temperature Xerothermic Environment

doi: 10.12358/j.issn.1001-5620.2025.02.013
  • 1.

    Sinopec Key Laboratory of Cementing and Completion, Beijing 102200

  • 2.

    Sinopec Research Institute of Petroleum Engineering Co., Ltd., Beijing 102200

  • 3.

    China University of Petroleum-Beijing College of Petroleum Engineering, Beijing 102200

  • Received Date: 2024-10-24
  • Rev Recd Date: 2024-11-28
  • Publish Date: 2025-04-17
    Abstract
  • In coal gasification and shale gas in-situ development, the bottoms of the wellbores are in an ultra-high temperature xerothermic environment, which is of great challenge to the thermal stability of the cement sheaths. To deal with this challenge, the deterioration of set silicate cement long exposed to 600℃ xerothermic environment was studied, and the microstructure features and hydration products were analyzed. It was found in the study that the compressive strength of the common set silicate cement in this environment decreased significantly, and the porosity and permeability of the set cement increased, the microstructure of the set cement turned from gel structure to granular structure, and the calcium hydroxide and C—S—H gel disappeared and changed into dicalcium silicate-γ, larnite and brownmillerite. The porosity and permeability of set sanded cement increased with time of aging, and the gel structure almost all disappeared and the structure of the set cement was finally mainly granular, cotton-like and needle-like crystal. Meanwhile, calcium hydroxide and C—S—H gel disappeared and changed into a large amount of larnite. Quartz, on the other hand, took part in the hydration reaction less intensively and didn’t have obvious effects on inhibiting the damage of set cement. These results show that silicate cement cannot satisfy the sealing requirement in in-situ development of shale gas in high temperature xerothermic environment. In this study, preliminary exploration was conducted on the adaptability of two cements, which are SCKL modified silicate cement and aluminate cement, to a long term 600℃ xerothermic environment, and it was found that aluminate cement can hopefully be used as a cementing material for in-situ development in ultra-high temperature xerothermic environment, further studies need to be conducted to improve its overall properties though. The results of the study have provided references to the selection of cement slurries suitable for cementing the formations in which in-situ development of shale gas and coal gasification are conducted, to the improvement of the overall properties of the set cement, and to the development of new cementing materials for high temperature high pressure well cementing.

     

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