Volume 38 Issue 4
Jul.  2021
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LIU Rengguang.Mechanical properties and microstructure of self-healing oil well cement[J]. Drilling Fluid & Completion Fluid,2021, 38(4):486-491 doi: 10.12358/j.issn.1001-5620.2021.04.014
Citation: LIU Rengguang.Mechanical properties and microstructure of self-healing oil well cement[J]. Drilling Fluid & Completion Fluid,2021, 38(4):486-491 doi: 10.12358/j.issn.1001-5620.2021.04.014

Mechanical Properties and Microstructure of Self-healing Oil Well Cement

doi: 10.12358/j.issn.1001-5620.2021.04.014
  • Received Date: 2021-04-15
  • Publish Date: 2021-07-31
  • The mechanical properties and microstructure of self-healing cement were studied. The adding amount of self -healing emulsion was 0, 5%, 10%, 15% and 20% respectively. The samples were cured under the condition of 90 degrees in the water for 3 days. The results showed that the elastic modulus of cement decreased with the incorporation of self-healing emulsion. With the increase of the dosage, the elastic modulus of cement decreased significantly. The strength of self-healing cement paste was higher than that of normal oil well cement. The compressive strength was higher with small amount addition, and the increase of flexural strength was greater with increase of addition. The microstructure of hydroxide crystal appeared scattered and loose instead of regular hexagonal. Self-healing colloidal particles were distributed between the network structures of hydration product gel. The porosity was reduced and the average and most probable pore size increased of self-healing cement.

     

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