Volume 36 Issue 4
Aug.  2019
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Article Navigation >  DRILLING FLUID & COMPLETION FLUID  > 2019  >  36(4): 431-436
FAN Sheng, SONG Bitao, CHEN Zengwei, LI Daqi, LIU Jinhua, CHENG Zengshou. Technology for Enhancing Pressure Bearing Capacity of Fractured Silurian System in Well Shunbei 5-8[J]. DRILLING FLUID & COMPLETION FLUID, 2019, 36(4): 431-436. doi: 10.3969/j.issn.1001-5620.2019.04.006
Citation: FAN Sheng, SONG Bitao, CHEN Zengwei, LI Daqi, LIU Jinhua, CHENG Zengshou. Technology for Enhancing Pressure Bearing Capacity of Fractured Silurian System in Well Shunbei 5-8[J]. DRILLING FLUID & COMPLETION FLUID, 2019, 36(4): 431-436. doi: 10.3969/j.issn.1001-5620.2019.04.006
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Technology for Enhancing Pressure Bearing Capacity of Fractured Silurian System in Well Shunbei 5-8

doi: 10.3969/j.issn.1001-5620.2019.04.006

  • 1. Sinopec Northwest Branch, Urumqi, Xinjiang 830011;

  • 2. Sinopec's Research Institute of Petroleum Engineering Technology, Beijing 100010;

  • 3. Sinopec Southwest Oilfield Service Corporation Hunan Drilling Company, Changsha, Hunan 417000

  • Received Date: 2019-03-20
  • Publish Date: 2019-08-30
    Abstract
  • Lost circulation is a severe downhole trouble frequently encountered in Block Shunbei in Xinjiang because of fractures around the fault zones resulted from strong geological movement in the Paleozoic Silurian System, high pressure formation saltwater and narrow safe drilling windows. In this paper, the characteristics of the mud losses occurred at the fractured Silurian System are extensively analyzed. The sizes and connectivity of the channels in the lost circulation zones are analyzed using actual drilling data, wireline logging data and hydraulic data, and factors affecting the pressure bearing capacity of the formations are carefully analyzed. A high temperature lost circulation material (LCM) slurry for the main fractured formations to make them dense was developed and a lost circulation control procedure, that is, "plugging while drilling, gradually strengthening, enhancing pressure bearing capacity section by section, and drilling steadily ahead", was formulated. This LCM slurry and the procedure were applied in Well Shunbei 5-8 for 13 times, all succeeded, greatly improving the pressure bearing capacity of the fractured formations. Time spent dealing with lost circulation has been reduced by 60%.

     

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