Volume 40 Issue 1
Jan.  2023
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TIAN Guoqiang.Optimized design of class a low permeability early strength oil well cement surry[J]. Drilling Fluid & Completion Fluid，2023, 40（1）：111-117 doi: 10.12358/j.issn.1001-5620.2023.01.015
Citation: TIAN Guoqiang.Optimized design of class a low permeability early strength oil well cement surry[J]. Drilling Fluid & Completion Fluid，2023, 40（1）：111-117 doi: 10.12358/j.issn.1001-5620.2023.01.015
shu

Optimized Design of Class A Low Permeability Early Strength Oil Well Cement Surry

doi: 10.12358/j.issn.1001-5620.2023.01.015

  • Changqing Well Cementing Company, ChuanQing Drilling Engineering Limited, CNPC, Xi’an, Shaanxi 710021

  • Received Date: 2022-09-21
  • Rev Recd Date: 2022-10-28
  • Publish Date: 2023-01-31
    Abstract
  • The class a cement used in the Ecuador project has several disadvantages such as narrow temperature and formation depth ranges in which the cement can be used normally, high initial consistency and poor pumpability etc. To solve these problems, study was conducted to optimize the class a cement slurry composition. a new cement slurry was developed as a result of the study. Laboratory experimental results show that the class a cement has specific area of 4100 - 4500 cm2/g and Na2O content of 0.47%. The upper limit of working temperature of the class a cement slurry is 65 ℃, the 10 h compressive strength of the cement slurry can reach 3.5 MPa, and the set cement has permeability of 0.1936 mD and percent volumetric shrinking of 0.03%. This new cement slurry was used to cement the technical casing of the well Mariann-78. CBL/VDL well logging data show that the quality of the cementing job is excellent; the performance of the class a cement slurry used in the Ecuador project has been significantly improved.

     

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