Volume 34 Issue 4
Jul.  2017
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LIU Zishuai, LI Yongjun, TANG Shouyong, WANG Dongming, JIANG Shiwei, ZHOU Chongfeng. Cementing High Temperature Deep Well Antan-1X with Narrow Annular Spaces[J]. DRILLING FLUID & COMPLETION FLUID, 2017, 34(4): 90-95. doi: 10.3969/j.issn.1001-5620.2017.04.017
Citation: LIU Zishuai, LI Yongjun, TANG Shouyong, WANG Dongming, JIANG Shiwei, ZHOU Chongfeng. Cementing High Temperature Deep Well Antan-1X with Narrow Annular Spaces[J]. DRILLING FLUID & COMPLETION FLUID, 2017, 34(4): 90-95. doi: 10.3969/j.issn.1001-5620.2017.04.017

Cementing High Temperature Deep Well Antan-1X with Narrow Annular Spaces

doi: 10.3969/j.issn.1001-5620.2017.04.017
  • Received Date: 2017-04-09
  • Publish Date: 2017-07-31
  • The Langgu sag, one of the three sags rich in oil in the Jizhong Depression, north China, is the main oil producing area of Huabei Oilfield. The reservoirs are deeply buried and the formation temperatures are high. The well Antan-1x is an exploratory well drilled in this area. This well had complex well profile, and the φ 127 mm liner (in 4th interval) was run to 5,494 m, at which the formation temperature is 177℃. Gas zones at the completion depth are very active and are difficult to control with high density drilling fluids. Narrow annular spaces and hence thin cement sheaths impose challenges to the high temperature stability and anti-channeling ability of cement slurry, and the compressive strength of set cement. A high temperature anti-channeling cement slurry was formulated for use in the well Antan-1x. This cement slurry has good anti-settling performance and ability in minimizing the amount of free water. Its thickening time is adjustable. The compressive strength of the set cement under 180℃ does not retrograde. A flushing spacer was formulated with high temperature suspension stabilizer, and the settling rate of the spacer under 180℃ was less than 0.03 g/cm3. In cementing the φ 127 mm liner string of the well Antan-1x, high quality cementing job was done with the high temperature cement slurry and the spacer, laying a good foundation for the later exploration and development of the Jizhong depression in north China.

     

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