Volume 36 Issue 2
Apr.  2019
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LI Bin, JIANG Guancheng, WANG Jinxi, WANG Lan, LIU Fan, WANG Xi, YANG Lili. Development and Evaluation of a Water Base Drilling Fluid Lubricant SDL-1[J]. DRILLING FLUID & COMPLETION FLUID, 2019, 36(2): 170-175. doi: 10.3969/j.issn.1001-5620.2019.02.007
Citation: LI Bin, JIANG Guancheng, WANG Jinxi, WANG Lan, LIU Fan, WANG Xi, YANG Lili. Development and Evaluation of a Water Base Drilling Fluid Lubricant SDL-1[J]. DRILLING FLUID & COMPLETION FLUID, 2019, 36(2): 170-175. doi: 10.3969/j.issn.1001-5620.2019.02.007

Development and Evaluation of a Water Base Drilling Fluid Lubricant SDL-1

doi: 10.3969/j.issn.1001-5620.2019.02.007
  • Received Date: 2018-12-23
  • Publish Date: 2019-04-30
  • High friction and high torque are two factors restricting the use of water base drilling fluids in extended reach horizontal drilling. A water base drilling fluid lubricant SDL-1 has been developed to resolve these problems. SDL-1 is a compound of ester synthesized with long chain fatty acid and low molecular weight polyalcohol, and some extreme-pressure additives. Evaluation of SDL-1 showed that addition of 1% SDL-1 in 4% fresh water base mud reduced the coefficient of friction of the mud by 85.2% and reduced the adhesion coefficient of mud cake by 59.3%. When aging at 160℃ for 16 h, the coefficient of friction of the mud was reduced by 94.0% and the adhesion coefficient of mud cake was reduced by 62.3%. When aging at 180℃ for 16 h, the coefficient of friction of the mud was still reduced by 90.0%, indicating that SDL-1 functions effectively at 180℃. SDL-1 is able to resist contamination by 30% NaCl and 30% CaCl2. In four-ball friction test, after 30 min of friction, SDL-1 effectively reduced the amount of scratch, reducing the surface wear-and-tear. This test showed that SDL-1 is a better lubricant in friction resistant than another lubricant DFL. When treated with 2% SDL-1, the rheology of a clay-free drilling fluid of density 2.0 g/cm3 and an environmentally friendly drilling fluid of density 2.2 g/cm3 was only slightly affected, and the friction coefficient of the two drilling fluids was reduced to 0.08. SDL-1 as a lubricant shows good lubricating performance and resistance to high temperature and salt contamination, and will find its application in deep extended reach drilling.

     

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