Volume 41 Issue 5
Nov.  2024
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ZHAO Lingxiao, WANG Chuncai, YE Sutao, et al.Technology for cementing high pressure narrow density window gas zones in well Dongqiu-X[J]. Drilling Fluid & Completion Fluid,2024, 41(5):661-667 doi: 10.12358/j.issn.1001-5620.2024.05.014
Citation: ZHAO Lingxiao, WANG Chuncai, YE Sutao, et al.Technology for cementing high pressure narrow density window gas zones in well Dongqiu-X[J]. Drilling Fluid & Completion Fluid,2024, 41(5):661-667 doi: 10.12358/j.issn.1001-5620.2024.05.014

Technology for Cementing High Pressure Narrow Density Window Gas Zones in Well Dongqiu-X

doi: 10.12358/j.issn.1001-5620.2024.05.014
  • Received Date: 2024-04-18
  • Rev Recd Date: 2024-05-21
  • Publish Date: 2024-11-07
  • The well Dongqiu-X is an exploration well drilled in the Qiulitage tectonic zone of the Kuche sag in the Tarim Basin. The fifth interval of the well was drilled to a depth of 6,130 m with Φ215.9 mm bits and a drilling fluid of 2.17 g/cm3, and was prematurely completed at that depth. During drilling mud losses occurred several times and oil and gas shows in the open hole section were encountered at different depths. Oil/gas kick and mud losses coexist in the same interval, with safe drilling window of only 0.06 g/cm3, meaning that severe losses of cement slurries during well cementing are prone to happen, and the losses of cement slurries may induce well blowout. To deal with this problem, precise pressure control while drilling was adopted to safely control the wellbore pressure, and a tough self-healing cement slurry was used to ensure the long-time integrity of the wellbore. The well Dongqiu-X was successfully cemented using the self-healing cement slurry combined with the use of liner hanger with top packer for auxiliary sealing. CBL/VDL logging results showed that the percent qualified cementing job was 94.3%. When the sixth interval was drilled with a mud of lower density, the drilling operation and the well completion operation were all successfully conducted , and no pressure trap in the annular space was found. The use of the well cementing technology has successfully solved the difficulties encountered in drilling high pressure gas well.

     

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