Volume 40 Issue 2
Mar.  2023
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LI Chengsong, LI Shekun, FAN Mingtao, et al.Numerical simulation study on mechanics of high density elastic and tough cement slurries[J]. Drilling Fluid & Completion Fluid，2023, 40（2）：233-240 doi: 10.12358/j.issn.1001-5620.2023.02.012
Citation: LI Chengsong, LI Shekun, FAN Mingtao, et al.Numerical simulation study on mechanics of high density elastic and tough cement slurries[J]. Drilling Fluid & Completion Fluid，2023, 40（2）：233-240 doi: 10.12358/j.issn.1001-5620.2023.02.012
shu

Numerical Simulation Study on Mechanics of High Density Elastic and Tough Cement Slurries

doi: 10.12358/j.issn.1001-5620.2023.02.012
  • 1.

    SINOPEC Star Petroleum Corporation Limited, Bejing 100083

  • 2.

    Cementing Company, Sinopec Zhongyuan Oilfield Service Corporation, Puyang, Henan 457001

  • Received Date: 2022-11-21
  • Rev Recd Date: 2022-12-15
  • Publish Date: 2023-03-30
    Abstract
  • Deep shale gas reservoirs are buried in deep formations with high temperatures and high fracture pressures. In fracturing these reservoirs, high flowrate and high pump pressure result in severe problem of sustained annular pressure. Compared with shallow shale gas reservoirs, deep shale gas reservoirs, because of their high formation pressures, have to be cased off with weighted cement slurries. The cement sheath is composed of not only the pure cement, it also contains weighting agents and additives that are used to improve the elasticity of the cement sheath. Based on this idea, a meso-mechanical model for high density elastic cement slurries is established to guide the improvement of the mechanical performance of the cement sheath in deep shale gas reservoirs. The effects of the additives added into a cement slurry on the mechanical performance of the set cement has been preliminarily analyzed. It was found in the study that 1) weighting materials and elasticity additives, because of the difference in their rigidity, can change the macro-mechanical performance of the set cement; 2) the interaction between the physical dimensions of the elasticity additives and the weighting agents must be considered in cement slurry design, and the bonding strength of the elasticity additive with the cement must be strengthened; 3) a cement slurry was designed with a selected weight material, whose particles are in rhombus-like shape, and a hydrophilic elastic agent. The mass ratio of the two additives was determined through experiment. This cement slurry, which has a density of 2.3 g/cm3, has 48 h compressive strength of greater than 20 MPa, and a elastic modulus of less than 7 GPa. With this cement slurry, a cement sheath of low elastic modulus and high strength cement sheath can be obtained in cementing deep shale gas reservoirs. The study achievements are of great guiding importance to the design of cement slurries for use in deep shale gas reservoirs.

     

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