Volume 34 Issue 2
Mar.  2017
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Article Navigation >  DRILLING FLUID & COMPLETION FLUID  > 2017  >  34(2): 33-38
YANG Qianyun, WANG Baotian, CAI Yong, LI Xiuling, YUAN Li. Development and Evaluation of Drilling Detergent Lubricant CLSD as Fast-drilling Agent[J]. DRILLING FLUID & COMPLETION FLUID, 2017, 34(2): 33-38. doi: 10.3969/j.issn.1001-5620.2017.02.006
Citation: YANG Qianyun, WANG Baotian, CAI Yong, LI Xiuling, YUAN Li. Development and Evaluation of Drilling Detergent Lubricant CLSD as Fast-drilling Agent[J]. DRILLING FLUID & COMPLETION FLUID, 2017, 34(2): 33-38. doi: 10.3969/j.issn.1001-5620.2017.02.006
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Development and Evaluation of Drilling Detergent Lubricant CLSD as Fast-drilling Agent

doi: 10.3969/j.issn.1001-5620.2017.02.006

  • Branch of Drilling Engineering Technology, Sinopec Shengli Petroleum Engineering Company Ltd., Dongying, Shandong 257064

  • Received Date: 2016-12-01
  • Publish Date: 2017-03-31
    Abstract
  • CLSD is a drilling detergent lubricant made from waste grease under predetermined synthesis process and technical parameters. Laboratory evaluation of CLSD showed that it had good compatibility with other additives, and rendered no bad effect on mud rheology. It moderately reduced API filter loss of the mud. Contact angle of 170.5℃ meant that CLSD was lipophilic. It had good cleaning and wetting performance, and was able to form oil films on the surface of metals. The surface tension of a 0.4% water solution of CLSD was 68.69% lower than that of fresh water, making it easier for the CLSD to go into the fractures formed by brill bit impacting the hole bottom, thus mitigating reservoir damage by water blocking. Using CLSD, the extreme pressure friction coefficient of a drilling fluid was reduced by 91.83%, and mud cake adhesion coefficient reduced by 62.67%. As temperature went up, the lubricity of the drilling fluid treated with CLSD was enhanced, thereby reducing the drilling torque and the friction coefficient of drilling fluids. CLSD had strong inhibitive capacity. It can be used in saturated drilling fluids. It functioned normally at 160℃ or higher. After hot rolling, drilling fluids treated with CLSD did not foam on the whole. The CLSD treated drilling fluids is suitable for use in deep wells and ultra-deep wells, because with an increase in well depth, the property of the drilling fluid becomes more stable. CLSD helped in reducing chip hold-down effect, thereby increasing ROP; in a laboratory simulation, the ROP was increased by 35.2%.

     

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