Volume 37 Issue 1
Feb.  2020
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ZHANG Xin, WEI Haoguang, LIU Jian, DING Shidong, ZHOU Shiming. Study on Particle Size Optimization and Performance of a Silica Water Suspension as Anti Gas Channeling Agent at 180 ℃[J]. DRILLING FLUID & COMPLETION FLUID, 2020, 37(1): 97-102. doi: 10.3969/j.issn.1001-5620.2020.01.016
Citation: ZHANG Xin, WEI Haoguang, LIU Jian, DING Shidong, ZHOU Shiming. Study on Particle Size Optimization and Performance of a Silica Water Suspension as Anti Gas Channeling Agent at 180 ℃[J]. DRILLING FLUID & COMPLETION FLUID, 2020, 37(1): 97-102. doi: 10.3969/j.issn.1001-5620.2020.01.016
shu

Study on Particle Size Optimization and Performance of a Silica Water Suspension as Anti Gas Channeling Agent at 180 ℃

doi: 10.3969/j.issn.1001-5620.2020.01.016

  • 1. SINOPEC Northwest Oilfield Branch, Urumqi, Xinjiang 830011;

  • 2. SINOPEC Research Institute of Petroleum Engineering, Beijing 100101

  • Received Date: 2019-08-08
  • Publish Date: 2020-02-28
    Abstract
  • To improve the gas-channeling prevention performance of regular silica water suspension in ultra-deep well drilling, the silica suspension was treated with a white carbon black and grounded with sand mill. The particle size of the solids in the suspension was optimized and the properties of the suspension evaluated in laboratory experiment. Basic performance evaluation was performed to evaluate the compatibility of the optimized silica water suspension with cement slurries. Other tests such as compressive strength test, porosity measuring and cementing strength test were performed to evaluate the gas-channeling prevention performance of the silica water suspension. Using XRD and SEM, the gas-channeling prevention mechanisms of the silica water suspension in cement slurries at 180 ℃ were analyzed and explained. It was found in the experiment that the average particle size of the silica was 300 nm, and was compatible very well with cement slurries. Cement slurries treated with 15% silica water suspension had compressive strength that can sustain for a very long time. The porosity of the set cement was less than 0.02 mD and the cementing strength was greater than 4 MPa. The amount of calcium hydroxide produced during hydration of the cement was greatly reduced and the micro structure of the set cement turned from massy to strip-shaped and fibrous. The study showed that the anti gas channeling agent formulated with particlesize optimized silica-water suspension was suitable for use in cement slurries commonly in use and performed better than regular silica water suspension.

     

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