Volume 35 Issue 3
May  2018
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Article Navigation >  DRILLING FLUID & COMPLETION FLUID  > 2018  >  35(3): 74-78
WANG Bo, LI Wei, ZHANG Wenzhe, LI Hongmei, WANG Tao. Performance Optimization of a Water Base Drilling Fluid for Continental Shale Gas Drilling in Block Yanchang[J]. DRILLING FLUID & COMPLETION FLUID, 2018, 35(3): 74-78. doi: 10.3969/j.issn.1001-5620.2018.03.012
Citation: WANG Bo, LI Wei, ZHANG Wenzhe, LI Hongmei, WANG Tao. Performance Optimization of a Water Base Drilling Fluid for Continental Shale Gas Drilling in Block Yanchang[J]. DRILLING FLUID & COMPLETION FLUID, 2018, 35(3): 74-78. doi: 10.3969/j.issn.1001-5620.2018.03.012
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Performance Optimization of a Water Base Drilling Fluid for Continental Shale Gas Drilling in Block Yanchang

doi: 10.3969/j.issn.1001-5620.2018.03.012

  • Research Institute of Yanchang Petroleum(Group) Ltd., Xi'an, Shaanxi 710075

  • Received Date: 2018-01-13
  • Publish Date: 2018-05-30
    Abstract
  • Abundant shale gas resource has been found in Yanchang, and the exploration and development of the resource is in research stage. The geology of the shale gas reservoirs is complex, and borehole collapse in horizontal drilling has always been a problem. The use of oil base mud to control borehole wall collapse has resulted in environment protection and high cost issues. To address these problems, a water base drilling fluid, PSW-1, was developed for shale gas drilling. The PSW-1 drilling fluid was treated with 0.2% BOP (a polymer), 2.0% gelling agent TQ-1, and 2.0% lubricant ORH-1 to improve its carrying capacity and lubricity. The properties of the PSW-1 are:YP=10 Pa, Gel strengths=4.5 Pa/10 Pa, and friction coefficient=0.07. Field test of PSW-1 on 4 wells demonstrates that it was able to effectively suspend and carry drilled solids, and showed excellent lubricity. The filter loss of the drilling fluid was 2.0-2.8 mL. Percent hole enlargement was only 6.34%. Borehole wall collapse was avoided, and downhole safety was ensured. The successful use of PSW-1 has provided technical support to the development of continental shale gas in block Yanchang.

     

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