Volume 37 Issue 6
Dec.  2020
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WANG Qingchen, ZHANG Jianqing, HU Zubiao, WANG Weiliang, SHI Deyi, WEI Yan. Study and Application of Drilling Fluid Technology for Slim Hole Drilling in Changqing Gas Field[J]. DRILLING FLUID & COMPLETION FLUID, 2020, 37(6): 746-752. doi: 10.3969/j.issn.1001-5620.2020.06.012
Citation: WANG Qingchen, ZHANG Jianqing, HU Zubiao, WANG Weiliang, SHI Deyi, WEI Yan. Study and Application of Drilling Fluid Technology for Slim Hole Drilling in Changqing Gas Field[J]. DRILLING FLUID & COMPLETION FLUID, 2020, 37(6): 746-752. doi: 10.3969/j.issn.1001-5620.2020.06.012
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Study and Application of Drilling Fluid Technology for Slim Hole Drilling in Changqing Gas Field

doi: 10.3969/j.issn.1001-5620.2020.06.012

  • CCDC Changqing General Drilling Company, Xi'an, Shaanxi 710021

  • Received Date: 2020-09-13
  • Publish Date: 2020-12-28
    Abstract
  • Mud loses, formation ballooning, borehole wall destabilization, difficulty in cuttings carrying and low success rate of wireline logging are problems encountered in slim hole drilling in the Changqing gas field. Technical measures have been taken to solve these problems. For example, reasonable flow rates can be used to prevent mud losses and formation ballooning, taking into account the reduction of circulation pressure and the improvement of hole cleaning. Also, in selecting the drilling fluid that was suitable for drilling the slim hole, new mud additive evaluation methods were used, taking into account the operational characteristics of slim hole drilling fluids, to select CQFY as the main inhibitor, a natural polymer NAT20 as the filter loss reducer and a non-fluorescence white asphalt NFA-25 as the sealant. Using these additives, a drilling fluid was formulated through optimization. The drilling fluid technology aforementioned has been used to drill the φ165.1 mm hole section andφ152.4 mm hole section since year 2018. Field operation showed that the drilling fluid technology effectively mitigated the drilling problems previously encountered; totally 235 wells of φ165.1 mm in diameter and 7 wells of φ152.4 mm in diameter were drilled successfully, borehole wall collapse, mud losses, formation ballooning were avoided and ROP increased. Success rates of wireline logging for the φ165.1 mm andφ152.4 mm wells were 84.7% and 100%, respectively.

     

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