Volume 33 Issue 4
Jul.  2016
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LYU Shuaifeng, WANG Shengwei, WU Xiaoming, WANG Daokuan, DONG Qingxiang, XIAO Yuhang, HUANG He. Degradable Polymer Drilling Fluids for In-seam Drilling[J]. DRILLING FLUID & COMPLETION FLUID, 2016, 33(4): 20-26. doi: 10.3969/j.issn.1001-5620.2016.04.004
Citation: LYU Shuaifeng, WANG Shengwei, WU Xiaoming, WANG Daokuan, DONG Qingxiang, XIAO Yuhang, HUANG He. Degradable Polymer Drilling Fluids for In-seam Drilling[J]. DRILLING FLUID & COMPLETION FLUID, 2016, 33(4): 20-26. doi: 10.3969/j.issn.1001-5620.2016.04.004

Degradable Polymer Drilling Fluids for In-seam Drilling

doi: 10.3969/j.issn.1001-5620.2016.04.004
  • Received Date: 2016-03-25
  • Publish Date: 2016-07-31
  • The #15 coal seam buried shallow in the Sihe coal mine in the south of Qinshui Basin has high content of coal bed methane (CBM) and is thus prospective in CBM mining. The #15 coal seam has a complex structure and its top and bottom are both limestone rich in water. In-seam drilling in the #15 coal seam has been encountering problems such as difficulty in cuttings carrying, borehole wall collapse, lost circulation and drilling fluid contamination to the coal seam. A degradable polymer drilling fluid has been developed to deal with these problems. The polymer drilling fluid was evaluated in laboratory through suspension of coal fines, simulation of borehole wall stabilizing with coring, viscosity attenuation and test on permeability return. The results have proved that the polymer drilling fluid has good cuttings carrying capacity and strong inhibitive capacity, mitigating borehole washout. Using bio-enzyme, formation permeability impairment of the target zones by drilling fluid can be reduced from 50%to 25%. This polymer drilling fluid has been tried in the platform X-2, the first industrial CBM drilling platform, with its properties as these: density 1.01-1.03 g/cm3, FV 35-40 sec, API Fl less than 15 mL, and pH 8-10. Addition of bio-enzyme reduced the viscosity of the drilling fluid by 40%. 900 m footage in the coal bed has been successfully drilled with this degradable polymer drilling fluid.

     

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