Volume 40 Issue 6
Dec.  2023
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WANG Jia, ZHANG Chunmei, ZHANG Ye, et al.Effects of rock asphalt with surface grafted C—S—H on mechanical properties of set cement in high temperature wells[J]. Drilling Fluid & Completion Fluid，2023, 40（6）：806-814 doi: 10.12358/j.issn.1001-5620.2023.06.016
Citation: WANG Jia, ZHANG Chunmei, ZHANG Ye, et al.Effects of rock asphalt with surface grafted C—S—H on mechanical properties of set cement in high temperature wells[J]. Drilling Fluid & Completion Fluid，2023, 40（6）：806-814 doi: 10.12358/j.issn.1001-5620.2023.06.016
shu

Effects of Rock Asphalt with Surface Grafted C—S—H on Mechanical Properties of Set Cement in High Temperature Wells

doi: 10.12358/j.issn.1001-5620.2023.06.016
  • 1.

    School of New Energy and Materials, Southwest Petroleum University, Chengdu, SiChuan, 610500

  • 2.

    No. 1 Cementing Branch of Bohai Drilling Engineering Co., Ltd. of CNPC, Renqiu, Hebei, 062552

  • Received Date: 2023-06-05
  • Rev Recd Date: 2023-07-18
  • Publish Date: 2023-12-30
    Abstract
  • This paper discusses the studies conducted on the effects of rock asphalt with surface grafted C—S—H on the mechanical property and microstructure of set cement used to seal high temperature oil wells. Measurement of the mechanical property and characterization of the microstructure of set cement samples were done with pressure testing machine and XRD, TG, SEM and EDS, respectively. Study results obtained in laboratory experiments show that compared with pure set cement, the set cement containing 1% nonmodified rock asphalt had its 3-day compressive strength reduced by 2.98%, while the set cement containing 1% rock asphalt which surface grafted C—S—H had its 3-day compressive strength increased by 4.26%. Phase analysis and TGA experiment results show that the addition of the rock asphalt with surface grafted C—S—H into the cement slurry does not cause change of the type of the hydrational products. The weight loss of a set cement containing 3% rock asphalt with surface grafted C—S—H is 1.01% higher than the weight loss of the pure set cement after aging for 3 days, indicating that rock asphalt with surface grafted C—S—H has accelerated the hydration process of the cement. Analyses of the micromorphology and element composition of the set cement indicate that the nonmodified rock asphalt thermally disintegrated at 180 ℃ and the particles of the asphalt were broken into pieces, while the rock asphalt with surface grafted C—S—H has formed an Si-rich layer around its surface, protecting the rock asphalt from generating air holes inside it and the asphalt particles are therefore not easy to break down. Furthermore, comparing the set cement containing nonmodified rock asphalt and the set cement containing rock asphalt with surface grafted C—S—H, it is found that the C element content at the interfaces of the former is 29.14% higher than that of the latter, and the C element content in the body of the former is 13.76% higher than that of the latter.

     

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