Volume 38 Issue 6
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HAN Jinliang, GUO Xinyang, SONG Yuyuan , et al.Gas channeling experiment of cement slurry in different solidification state[J]. Drilling Fluid & Completion Fluid，2021, 38（6）：760-764 doi: 10.12358/j.issn.1001-5620.2021.06.016
Citation: HAN Jinliang, GUO Xinyang, SONG Yuyuan , et al.Gas channeling experiment of cement slurry in different solidification state[J]. Drilling Fluid & Completion Fluid，2021, 38（6）：760-764 doi: 10.12358/j.issn.1001-5620.2021.06.016
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Gas Channeling Experiment of Cement Slurry in Different Solidification State

doi: 10.12358/j.issn.1001-5620.2021.06.016
  • 1.

    PETROCHINA CBM Institute Of Engineering Technology, Xi’an, Shanxi 710016

  • 2.

    Key Laboratory of Unconventional Oil & Gas Development (China University of Petroleum (East China)), Ministry of Education, Qingdao, Shandong 266580

  • 3.

    Cementing Services Company of Great wall Drilling Company, CNPC, Panjin, Liaoning124000

  • Received Date: 2021-07-07
    Available Online: 2022-01-27
  • Publish Date: 2021-11-30
    Abstract
  • Experiment on the gas channeling in different setting states of cement slurry was designed and conducted to deal with gas channeling. In the experiment, the gas channeling was observed, the gas channeling pressure measured, the form and path of gas channeling analyzed, and the pattern of gas channeling studied. The study results have shown that when the cement slurry sets in a short time (120 min and 180 min), the gas channeling pressure is low (<0.05 MPa), the gas channels slowly through the interior of the cement slurry, and the diameter of the channel is small but increases from the bottom to the top of the cement column. When the cement slurry sets in a longer time, say, 200 min and 220 min, the gas channeling pressure is increased to 0.15 MPa and 0.20 MPa, the gas channels abruptly in a high flow rate through the interior of the cement slurry, and the channel is in a shape of “serial bubbles” and “fractures” with big sizes. When the cement slurry sets in 240 min, the gas channeling pressure is increased to 0.22 MPa, and the gas can no longer channel through the interior of the cement slurry, it can only channel through the interface between the cement slurry and the borehole wall. It is thus recommended that anti-channeling measures should be designed in according with different setting states of the cement slurry.

     

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