Volume 37 Issue 2
Apr.  2020
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LI Xiaolin, WU Chaoming, ZHAO Shuxun, LIN Zhihui, WANG Guifu, LING Yong, WANG Lang. Technology for Cementing Shale Oil Reservoirs in Dagang Oilfield: Study and Application[J]. DRILLING FLUID & COMPLETION FLUID, 2020, 37(2): 232-238. doi: 10.3969/j.issn.1001-5620.2020.02.017
Citation: LI Xiaolin, WU Chaoming, ZHAO Shuxun, LIN Zhihui, WANG Guifu, LING Yong, WANG Lang. Technology for Cementing Shale Oil Reservoirs in Dagang Oilfield: Study and Application[J]. DRILLING FLUID & COMPLETION FLUID, 2020, 37(2): 232-238. doi: 10.3969/j.issn.1001-5620.2020.02.017
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Technology for Cementing Shale Oil Reservoirs in Dagang Oilfield: Study and Application

doi: 10.3969/j.issn.1001-5620.2020.02.017

  • The Second Cementing Division of the Bohai Drilling and Exploration Company, Tianjin 300280

  • Received Date: 2019-12-19
  • Publish Date: 2020-04-28
    Abstract
  • Cementing of the shale oil reservoir section in Dagang oilfield has encountered several difficulties such as complex formation pressure system, active oil and gas, poor compatibility between the potassium salt drilling fluid and the cement slurry, difficulty in displacing drilling fluid mixed with oil, as well as rigorous requirement on the mechanical property of the set cement. Laboratory study was conducted on the cement slurry to be sued and the techniques for performing the well cementing job. A functional pre-pad fluid with oil washing ability was selected for the cementing operation, more than 90% of the potassium salt drilling fluid can be washed off the borehole wall. According to the "four low one high" requirement by Dagang oilfield on cementing the shale oil reservoirs, a tough high strength anti-channeling cement slurry was selected. This cement slurry has transition time for static gelling of 5 min, high compressive strength, low elastic modulus, excellent anti-channeling performance and set cement with outstanding mechanical property. Prior to well cementing, wiper trip with "two centralizers" and "three centralizers" was implemented, the hole was cleaned with high-vis pill containing fibers, and pseudo mud cakes were removed. A set of techniques suitable for shale oil reservoir cementing in Dagang oilfield was established and successfully used in field operation.

     

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