Volume 37 Issue 5
Oct.  2020
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GAO Jichao, LI Jianhua, ZHOU Xue, LI Yanjun, LU Haichuan, LI Dewei, YANG Chen. Study and Evaluation of a Nano Compound Strength Enhancer[J]. DRILLING FLUID & COMPLETION FLUID, 2020, 37(5): 651-655. doi: 10.3969/j.issn.1001-5620.2020.05.019
Citation: GAO Jichao, LI Jianhua, ZHOU Xue, LI Yanjun, LU Haichuan, LI Dewei, YANG Chen. Study and Evaluation of a Nano Compound Strength Enhancer[J]. DRILLING FLUID & COMPLETION FLUID, 2020, 37(5): 651-655. doi: 10.3969/j.issn.1001-5620.2020.05.019
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Study and Evaluation of a Nano Compound Strength Enhancer

doi: 10.3969/j.issn.1001-5620.2020.05.019

  • 1. Boxing Company of CNPC Offshore Engineering Company Limited, Tianjin 300450;

  • 2. No. 4 Gas Production Plant, PetroChina Changqing Oilfield, Xi'an, Shaanxi 71000;

  • 3. CCDC ChangQing Well Cementing Company, Xi'an, Shaanxi 710000

  • Received Date: 2020-05-10
  • Publish Date: 2020-10-28
    Abstract
  • Set cement from a low-density cement slurry has low strength and slow hardness development at the top of the cement slurry. Regular accelerating early strength materials, though can be used to enhance the strength of the set cement, will obviously shorten the thickening time of the cement slurry, hence reducing the strength of the set cement. To solve this problem, a "weak accelerating high early strength" compound strength enhancer was developed with a surface modified nano material and some high efficiency activators. The strength enhancer was evaluated in different low-density cement slurries by controlling the concentration of the strength enhancer, temperature, water/cement ratio and density. It was found in the evaluation experiments that the strength enhancer can greatly increase the compressive strength of the set cement, with only minor effect on the thickening time of the cement slurry. In these experiments, the percent strength increase of the top of the low-density cement slurry can be 40% or higher. The nano compound strength enhancer can be used in different low-density cement slurries to improve the compressive strength of the set cement. Application of this strength enhancer in Changqing Oilfield has proved its good performance.

     

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