Volume 40 Issue 2
Mar.  2023
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Article Navigation >  DRILLING FLUID & COMPLETION FLUID  > 2023  >  40(2): 222-232
YU Lin, TAN Huijing, REN Yang, et al.Study on the influence of elastic toughness cement slurry performance and short-term corrosion mechanism under HPHTHS conditions[J]. Drilling Fluid & Completion Fluid，2023, 40（2）：222-232 doi: 10.12358/j.issn.1001-5620.2023.02.011
Citation: YU Lin, TAN Huijing, REN Yang, et al.Study on the influence of elastic toughness cement slurry performance and short-term corrosion mechanism under HPHTHS conditions[J]. Drilling Fluid & Completion Fluid，2023, 40（2）：222-232 doi: 10.12358/j.issn.1001-5620.2023.02.011
shu

Study on the Influence of Elastic Toughness Cement Slurry Performance and Short-term Corrosion Mechanism under HPHTHS Conditions

doi: 10.12358/j.issn.1001-5620.2023.02.011
  • 1.

    Northeast Sichuan Gas Field, PetroChina Southwest Oil & Gas Field Company, Dazhou, Sichuan 635000

  • 2.

    State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu, Sichuan 610059

  • Received Date: 2022-12-09
  • Rev Recd Date: 2023-01-06
  • Publish Date: 2023-03-30
    Abstract
  • To understand the corrosion environment of a set cement at high temperature, high pressure and high H2S/CO2 conditions and the complex work condition thus formed, a series of experiments were conducted to study the property change and short-term corrosion mechanisms of elastic tough cement slurries under the “three-high” conditions. A class G cement slurry was treated with three main elastic tough additives commonly used, i.e., rubber powder at 10%, basalt fiber at 0.3% and styrene-butadiene latex at 10%. The cement slurry thus formulated was rendered elasticity to some extent. Using several methods such as mechanical property measurement, XRD, FTIR, MIP and SEM-EDS etc., changes were studied in the mechanical properties, distribution of pore throat sizes, types of hydration products and micro-structures before and after the cement slurry was treated with the three additives and was cured under corrosion conditions. The measurement results show that the addition of the three elastic tough additives is beneficial to the decrease of the brittleness and to the increase of the toughness of the set cement. Among these additives, the basalt fiber is the best additive for controlling the fracture development in the set cement when it fails, and the styrene-butadiene latex is the best additive for reducing the elastic modulus and maintaining a high flexural strength of the set cement. After undergoing a short-term corrosion in liquid environment, the mechanical strengths of the cement samples were all improved, especially the set cement containing basalt fiber and styrene-butadiene latex. Basalt fiber under the corrosion conditions showed stable properties, the dense calcium carbonate crystals produced in the corrosion process were piled in the pores located at the interfaces between the basalt fiber and the cement matrix, leading to a decrease in the total pore volume in the corroded set cement and a substantial increase in the mechanical strength of the set cement. The styrene-butadiene latex can form a polymer membrane inside the set cement, which covers and wraps up the cement matrix, thereby improving the anti-corrosion property of the cement surfaces.

     

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