Volume 35 Issue 1
Jan.  2018
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ZHANG Xingguo, YU Xuewei, GUO Xiaoyang, YANG Jixiang, YAN Rui, LI Zaoyuan. A Temperature Sensitive Expanding Microcapsule Anti-Gas-Channeling Cement Slurry[J]. DRILLING FLUID & COMPLETION FLUID, 2018, 35(1): 71-76. doi: 10.3969/j.issn.1001-5620.2018.01.014
Citation: ZHANG Xingguo, YU Xuewei, GUO Xiaoyang, YANG Jixiang, YAN Rui, LI Zaoyuan. A Temperature Sensitive Expanding Microcapsule Anti-Gas-Channeling Cement Slurry[J]. DRILLING FLUID & COMPLETION FLUID, 2018, 35(1): 71-76. doi: 10.3969/j.issn.1001-5620.2018.01.014

A Temperature Sensitive Expanding Microcapsule Anti-Gas-Channeling Cement Slurry

doi: 10.3969/j.issn.1001-5620.2018.01.014
  • Received Date: 2017-10-13
  • Publish Date: 2018-01-30
  • A temperature sensitive expanding microcapsule anti-gas-channeling agent has been synthesized with acrylonitrile (AN), methylmethacrylate (MMA) and methyl acrylate (MA) as the wall material, and iso-butane as the core material. The effects of the amount of iso-butane used in the synthesis on the performance of the anti-gas-channeling were studied, and the performance of the temperature sensitive expanding microcapsule anti-gas-channeling cement slurry in controlling gas channeling was evaluated. The studies and the evaluation results showed that the temperature sensitive expanding microcapsule anti-gas-channeling agent can be obtained under the following conditions:in 100 g of deionized water add AN, MMA and MA in a ratio of 3:0.4:2, 30% iso-butane, 1% lauroyl peroxide (LPO, as initiator), 0.1% 1, 4-butanediol dimethacrylate (BDDMA, as crosslinking agent), 20% nano silicon dioxide (as dispersant), and react these substances at 65℃ with the protection of nitrogen. The anti-gas-channeling agent has initial expansion temperature of 65℃, optimal expansion temperature of 83℃, and is resistant to temperature as high as 120℃. Rate of expansion of the anti-gas-channeling agent is 50. Stimulation of water-channeling/gas-channeling in oil well cement and test of cement slurry condensation and contraction indicated that volumetric contraction of cement slurry can be made up for with less than 2% of the synthesized anti-gas-channeling agent, meaning that this anti-gas-channeling agent has good gas-channeling prevention ability.

     

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