Volume 40 Issue 2
Mar.  2023
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Article Navigation >  DRILLING FLUID & COMPLETION FLUID  > 2023  >  40(2): 241-250, 258
SUN Xialan, REN Qiang, WU Ke, et al.Impact resistance mechanical properties and damage characteristics of set cement containing nitril rubber powders[J]. Drilling Fluid & Completion Fluid，2023, 40（2）：241-250, 258 doi: 10.12358/j.issn.1001-5620.2023.02.013
Citation: SUN Xialan, REN Qiang, WU Ke, et al.Impact resistance mechanical properties and damage characteristics of set cement containing nitril rubber powders[J]. Drilling Fluid & Completion Fluid，2023, 40（2）：241-250, 258 doi: 10.12358/j.issn.1001-5620.2023.02.013
shu

Impact Resistance Mechanical Properties and Damage Characteristics of Set Cement Containing Nitril Rubber Powders

doi: 10.12358/j.issn.1001-5620.2023.02.013
  • 1.

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

  • 2.

    China National Petroleum Corporation Bohai Drilling Engineering Technology Research Institute, Tianjin 300451

  • 3.

    China National Petroleum Corporation Southwest Oil and Gas Field Branch Exploration Division, Chengdu, Sichuan 610500

  • Received Date: 2022-12-08
  • Rev Recd Date: 2023-01-17
  • Publish Date: 2023-03-30
    Abstract
  • Oil well cement is a typical brittle material, presently many studies are focused on improving the toughness and reducing the brittleness of the cement sheath, as well as prolonging the service life of an oil/a gas well without impairing the safety of the well. In this study, the microsphere nitrile rubber powder (MRP) and the irregular nitrile rubber powder (NRP) were separately added to cement slurry to investigate the mechanical performance of impact resistance and the damage characteristics of the set cement. Using a split Hopkinson pressure bar (SHPB) with a diameter of 50 mm, the dynamic impact resistance performance of different set cement samples was tested. The dynamic compressive strength, energy evolution and damage characteristics of the set cement samples were discussed using the test results. A set cement sample containing 6% MRP had dynamic compressive strength of 64.02 MPa, and the absorbed energy of the sample was 39.93 J, equivalent to an absorbed energy rate of 49.91%. Another set cement sample containing 6% NRP had dynamic compressive strength of 74.06 MPa, and the absorbed energy of the sample was 46.56 J, equivalent to an absorbed energy rate of 58.20%. It was found from high-speed photographing and micromorphology observation that NRP is more closely bonded with the set cement matrix, and the crack resistance of the set cement was improved through crack deflection mechanism, which is beneficial to prolonging the load bearing time of the sample and increasing the consumption of the load energy.

     

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