Volume 42 Issue 5
Sep.  2025
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LIU Jian, SONG Weitao, LI Jin, et al.Mechanical properties of filter cake on well cement sheath: an evaluation method and how they are affected[J]. Drilling Fluid & Completion Fluid，2025, 42（5）：646-655 doi: 10.12358/j.issn.1001-5620.2025.05.011
Citation: LIU Jian, SONG Weitao, LI Jin, et al.Mechanical properties of filter cake on well cement sheath: an evaluation method and how they are affected[J]. Drilling Fluid & Completion Fluid，2025, 42（5）：646-655 doi: 10.12358/j.issn.1001-5620.2025.05.011
shu

Mechanical Properties of Filter Cake on Well Cement Sheath: An Evaluation Method and How They Are Affected

doi: 10.12358/j.issn.1001-5620.2025.05.011
  • 1.

    School of Petroleum and Natural Gas Engineering, SouthWest Petroleum University, Chengdu, Sichuan 610500

  • 2.

    CCDC Downhole Operation Company, Chengdu, Sichuan 610052

  • Received Date: 2025-04-28
  • Rev Recd Date: 2025-07-21
  • Publish Date: 2025-09-30
    Abstract
  • Shale gas wells are generally fractured with multi-stage fracturing technology, sustained annular pressure will seriously affect their long-term, stable, safe and efficient development. The mechanical state of the borehole cement sheath and the pressure bearing capacity of the interface between the borehole wall and the cement sheath are the key to the long-term sealing of the borehole. The mechanical state of the interface between the filter cake and the cement sheath, which is the weakest part of the borehole, is directly related to the bearing capacity of the interface. Presently it is quite difficult to directly measure the mechanical properties of the filter cake bonded with the cement sheath. In this study, a method of testing the mechanical properties of filter cakes was developed, and the effects on the mechanical properties of the interfacial filter cakes was analyzed. The study shows that the phase of the filter cakes is mainly composed of barite, organophilic clay and calcium carbonate, the sizes of the particles in the filter cakes mainly range from 60 μm to 80 μm, the porosity of the filter cakes mainly range from 10% to 20%, and the permeability of the filter cakes mainly range from 0.05–0.15 mD. Several factors, such as increase in filtration pressure, increase in organophilic clay content, decrease in filter cake porosity as well as decrease in water content of filter cake, all to some extent help enhance the mechanical properties of the filter cakes bonded with cement sheaths. The results of the study have laid an important theoretical and technical foundation for understanding the load distribution on the interfaces of the cement sheath and for optimizing field well cementing technique scheme.

     

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