Volume 36 Issue 5
Oct.  2019
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GUO Yongbin, WU Zhiming, YANG Yuhao, YU Yi, LIU Zhiqin. An Elastic Spacer for Preventing Trapped Pressure in Annulus of Deepwater Oil and GAs Wells[J]. DRILLING FLUID & COMPLETION FLUID, 2019, 36(5): 654-658. doi: 10.3969/j.issn.1001-5620.2019.05.022
Citation: GUO Yongbin, WU Zhiming, YANG Yuhao, YU Yi, LIU Zhiqin. An Elastic Spacer for Preventing Trapped Pressure in Annulus of Deepwater Oil and GAs Wells[J]. DRILLING FLUID & COMPLETION FLUID, 2019, 36(5): 654-658. doi: 10.3969/j.issn.1001-5620.2019.05.022
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An Elastic Spacer for Preventing Trapped Pressure in Annulus of Deepwater Oil and GAs Wells

doi: 10.3969/j.issn.1001-5620.2019.05.022

  • Zhanjiang Branch of CNOOC, Zhanjiang, Guangdong 524000

  • Received Date: 2019-04-25
  • Publish Date: 2019-10-30
    Abstract
  • In deepwater oil and gas development, temperature rise in fluid trapped in the annulus between casing string and drill pipe causes an increase in the pressure trapped in the annulus, resulting in collapse or bursting of casing string which brings serious hidden risk to oil and gas production. To resolve this problem, an elastic spacer for preventing trapped pressure in annulus was developed and evaluated with a self-made "HTHP elastic fluid evaluation tester" and a "reciprocating compression tester for elastic materials". The composition of the elastic spacer is:sea water + 0.4% suspending agent + 6% elastic agent + ultra-fine iron ore powder. The density of the spacer is adjustable between 1.10 g/cm3 and 1.90 g/cm3. Laboratory evaluation of the spacer shows that:1) the elastic spacer has high elasticity and high compressive strength, and shows 100% elasticity. 2) the spacer retains its elasticity at different temperatures, effectively relieve accumulation of pressures. 3) the spacer has good compatibility with drilling fluids and cement slurries, and does not affect the use of the spacer and well cementing job. The spacer developed can be used to mitigate and control trapped pressure in annulus in deepwater drilling.

     

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    • References(15)
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