Volume 43 Issue 5
Oct.  2026
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Yang Lyuchao, Meng Renzhou, Zhang Xiaolin, et al.Formulation and evaluation of high-temperature large temperature-difference low-density cement slurry[J]. Drilling Fluid & Completion Fluid，2026, 43（5）：680-687 doi: 10.12358/j.issn.1001-5620.2026.05.012
Citation: Yang Lyuchao, Meng Renzhou, Zhang Xiaolin, et al.Formulation and evaluation of high-temperature large temperature-difference low-density cement slurry[J]. Drilling Fluid & Completion Fluid，2026, 43（5）：680-687 doi: 10.12358/j.issn.1001-5620.2026.05.012
shu

Formulation and Evaluation of High-Temperature Large Temperature-Difference Low-Density Cement Slurry

doi: 10.12358/j.issn.1001-5620.2026.05.012
  • 1.

    CNPC Ultra-Deep Complex Oil and Gas Reservoir Exploration and Development Technology Research and Development Center, Korla, Xinjiang 841000

  • 2.

    Xinjiang Uygur Autonomous Region Ultra-Deep Complex Oil and Gas Reservoir Exploration and Development Engineering Research Center, Korla, Xinjiang 841000

  • 3.

    Xinjiang Ultra-Deep Oil and Gas Key Laboratory, Korla, Xinjiang 841000

  • 4.

    PetroChina Tarim Oilfield Company, Korla 841000

  • 5.

    China Petroleum Engineering Technology Research Institute Co., Ltd., Beijing 102206

  • Received Date: 2026-03-14
  • Rev Recd Date: 2026-05-03
  • Publish Date: 2026-10-01
    Abstract
  • Deep and ultra-deep wells generally have ultra-deep and long cementing hole sections, and some of them also have low-pressured and thief zones that make the operation difficult. In cementing these wells, the cement slurries are faced with technical challenges such as high bottomhole temperature, large temperature-difference, and slow strength development of low-density set cement etc., making it difficult to balance the regulation of thickening time, the stability of cement slurry and the strength of set cement. Using a self-developed high-temperature suspension stabilizer and a thickening time regulator for large temperature-difference, a low-density cement slurry for working under high temperature and large temperature-difference was formulated based on close-packing theory to optimize the sizing of the particles. The density of the cement slurry can be adjusted between 1.20 g/cm3 and 1.55 g/cm3. Experimental results show that the hydrophobic association effect of the high-temperature suspension stabilizer slows down the reduction of the solution viscosity between 70 ℃ and 160 ℃. The large-temperature-difference thickening time regulator, by releasing temperature-sensitive functional groups, achieves “weak retarding at the top and strong retarding at the bottom”. The cement slurry formulated, after aging at a high temperature of 200 ℃, have 0 free water and sedimentation stability of less than 0.05 g/cm3. Under large temperature-differences, the low-temperature section of the top set cement has a 48-hour strength of 3.6 MPa, which can meet the requirements of supporting the casing strings and ensuring drilling ahead. At 120 ℃ – 180 ℃, the 14-day strength of the set cement exceeds 13 MPa, with no obvious strength degradation occurred in 28 days. This high-temperature low-density cement slurry for large temperature-difference conditions provides a technical idea for addressing the problems of high-temperature instability, thickening time regulation and low strength of low-density cement slurries. It also provides support to safe and high-quality cementing of low-pressure deep- and ultra-deep- wells with thief zones.

     

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