Volume 39 Issue 4
Jul.  2022
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Article Navigation >  DRILLING FLUID & COMPLETION FLUID  > 2022  >  39(4): 466-471
ZHANG Guoguang, WANG Chunyu, DAI Dan, et al.The effects of particle size of silica flour on the performance of oil well cement at high temperature and high pressuree[J]. Drilling Fluid & Completion Fluid，2022, 39（4）：466-471 doi: 10.12358/j.issn.1001-5620.2022.04.011
Citation: ZHANG Guoguang, WANG Chunyu, DAI Dan, et al.The effects of particle size of silica flour on the performance of oil well cement at high temperature and high pressuree[J]. Drilling Fluid & Completion Fluid，2022, 39（4）：466-471 doi: 10.12358/j.issn.1001-5620.2022.04.011
shu

The Effects of Particle Size of Silica Flour on the Performance of Oil Well Cement at High Temperature and High Pressure

doi: 10.12358/j.issn.1001-5620.2022.04.011
  • 1.

    COSL Oilfield Chemical Research Institute, Yanjiao, Hebei 065201

  • 2.

    College of Materials Science and Engineering, Nanjing Tech University, Nanjing, Jiangsu 211816

  • Received Date: 2022-02-21
  • Rev Recd Date: 2022-03-31
  • Publish Date: 2022-07-30
    Abstract
  • Silica flour is commonly used in oil well cement to prevent the strength retrogression of hardened cement paste at high temperature and high pressure. In this study, a class G cement slurry was mixed with 35% silica flour of different sizes and cured at high temperature and high pressure (240 ℃ and 21 MPa) for 180 d to study the effects of the silica flour particle size on the high temperature mechanical properties of the hardened cement paste. The compressive strength and permeability of the hardened cement paste containing silica flour of different particle sizes were measured, and the hydration products and pore structure were analyzed. It was found that silica flour prevented the strength retrogression of the hardened cement paste at high temperature, and the compressive strength of the hardened cement paste decreased with the decrease of silica flour particle size. Silica flour reduced the permeability of the hardened cement paste. The smaller the particle size of the silica flour, the lower the permeability. The cement slurry mixed with larger particle size silica flour produced longer needle-like xonotlite, which was the main reason why the hardened cemlent paste had high compressive strength. A high temperature and high pressure cement slurry containing 35% 300-mesh silica flour and other additives was used to cement the well DX-11-2 in the Nanhai oilfield. The well cementing operation was smoothly performed, and the 24 h CBL and VDL wireline logging showed that the cementing quality was excellent.

     

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