Volume 36 Issue 1
Feb.  2019
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WANG Lan, WU Qi, JIANG Guancheng. Modified Soybean Lecithin Used as Water Base Drilling Fluid Lubricant[J]. DRILLING FLUID & COMPLETION FLUID, 2019, 36(1): 10-14. doi: 10.3969/j.issn.1001-5620.2019.01.002
Citation: WANG Lan, WU Qi, JIANG Guancheng. Modified Soybean Lecithin Used as Water Base Drilling Fluid Lubricant[J]. DRILLING FLUID & COMPLETION FLUID, 2019, 36(1): 10-14. doi: 10.3969/j.issn.1001-5620.2019.01.002

Modified Soybean Lecithin Used as Water Base Drilling Fluid Lubricant

doi: 10.3969/j.issn.1001-5620.2019.01.002
  • Received Date: 2018-12-05
  • Publish Date: 2019-02-28
  • Using lactic acid and hydrogen peroxide, the natural soybean lecithin can be modified through hydroxylation. The modified soybean lecithin is non-toxic, with EC50 greater than 30,000 mg/L. The modified soybean lecithin has good lubricity in fresh water, fresh water bentonite slurry and water base drilling fluids. Fresh water containing modified soybean lecithin has extreme pressure film whose strength is twice that of the extreme pressure film formed from PF-Lube in fresh water or CX-300H in fresh water. In 30 min four-ball friction test, the friction coefficient of a 1% modified soybean lecithin solution is less than 0.1, better as a lubricant than the DFL lubricant imported. The modified soybean lecithin was used at a concentration of 1% to treat 4% bentonite fresh water slurries before and after aging at 120 ℃,reducing the extreme pressure friction coefficient of the bentonite slurries by 90%, better than DFL and PF-Lube as extreme pressure lubricant. An environmentally friendly water base drilling fluid of 2.0 g/cm3 treated with 1% modified soybean lecithin and aged at 120 ℃ had lower viscosity,the HTHP filtration rate was reduced by about 50%, and the sticking coefficient and extreme pressure friction coefficient were all reduced by at least 60%. SEM was used to analyze the extreme pressure scratch, and XPS element analysis was conducted to reveal the lubricating mechanisms of the modified soybean lecithin. In general, the modified soybean lecithin is non-toxic and has good extreme pressure lubricity, revealing itself as a good lubricant in extended reach horizontal drilling.

     

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