Volume 43 Issue 3
Jun.  2026
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LI Chengquan, LIU Bo, YU Zhaocai, et al.Pressure transmission efficiency and changing pattern of hydrostatic pressure of cement slurries[J]. Drilling Fluid & Completion Fluid，2026, 43（3）：402-409 doi: 10.12358/j.issn.1001-5620.2026.03.014
Citation: LI Chengquan, LIU Bo, YU Zhaocai, et al.Pressure transmission efficiency and changing pattern of hydrostatic pressure of cement slurries[J]. Drilling Fluid & Completion Fluid，2026, 43（3）：402-409 doi: 10.12358/j.issn.1001-5620.2026.03.014
shu

Pressure Transmission Efficiency and Changing Pattern of Hydrostatic Pressure of Cement Slurries

doi: 10.12358/j.issn.1001-5620.2026.03.014
  • 1.

    Development Division, Southwest Oil and Gas Field Branch, PetroChina, Chengdu, Sichuan, 610500

  • 2.

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

  • Received Date: 2025-12-05
  • Rev Recd Date: 2026-01-27
    • Available Online: 2026-06-12
  • Publish Date: 2026-06-12
    Abstract
  • The decline of the hydrostatic pressure of a cement slurry is considered to be one of the main causes resulting in early annular gas channeling, and annular gas channeling in turn is a key factor hindering normal oil and gas production. However, quite few studies are conducted on the changing pattern of hydrostatic pressure under pressure conditions. To deal with this situation, hydrostatic pressure experiments on well cement slurries under stepwise pressure holding conditions (sustained pressure holding at 4.5 MPa for 5 minute in 30-minute intervals) were conducted using a self-developed instrument. Meanwhile, considering the difficulty of conducting hydrostatic pressure experiments in field oil and gas wells, cement slurry samples taken from a field well were used to conduct hydrostatic pressure and static gel strength tests at different temperatures. The test results, combined with well logging data, were used to modify the properties of the cement slurry. The results show that during the WOC period, the pressure transmission efficiency of the cement slurry exhibit a changing pattern similar to that of the hydrostatic pressure: both remain stable at first, then decrease rapidly after reaching the fast weightlessness point, and the pressure transmission efficiency drops to 0 after complete weightlessness. At medium- to high-temperatures, there’s only a small difference exists between the hydrostatic pressure and the gel strength of the cement slurry, and thus the gel strength can be used to estimate the time at which the weightlessness of the cement slurry is reached. At low temperatures, the weightlessness time of the cement slurry decreases with increasing temperature, and from the well logging data it can be seen that the pressure transmission efficiency of the cement slurry that loses weight first drops to 0, the pressure held at the wellhead cannot be effectively transmitted to the lower part of the well, thereby impairing the quality of the well cementing job. By adjusting the composition of the cement slurry to prolong the weightlessness time of the retarded cement slurry, the quality of the well cementing operation has been successfully improved.

     

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