Volume 39 Issue 1
May  2022
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WANG Jing, ZHANG Shuncong, LI Changling, et al.Mechanisms of oleamide as thinner in oil based drilling fluids[J]. Drilling Fluid & Completion Fluid,2022, 39(1):15-22 doi: 10.12358/j.issn.1001-5620.2022.01.003
Citation: WANG Jing, ZHANG Shuncong, LI Changling, et al.Mechanisms of oleamide as thinner in oil based drilling fluids[J]. Drilling Fluid & Completion Fluid,2022, 39(1):15-22 doi: 10.12358/j.issn.1001-5620.2022.01.003

Mechanisms of Oleamide as Thinner in Oil Based Drilling Fluids

doi: 10.12358/j.issn.1001-5620.2022.01.003
  • Received Date: 2021-09-12
  • Rev Recd Date: 2021-11-09
  • Publish Date: 2022-05-06
  • In laboratory experiment, different types of clay were added to a base mud to investigate the effect of formation clays on the viscosity of the base mud, and an asphalt filter loss reducer was added to a base mud at different concentrations to investigate the effect of asphalt on the viscosity of the mud. After adding 5% organophilic clay and 15.5% asphalt filter loss reducer into the base mud, the plastic viscosity of the base mud was increased by 100%, and the yield point of the base mud was increased by at least 370%. An oleamide type thinner was then added into the base mud contaminated with organophilic clay at 1% and the viscosity of the base mud was reduced by 10%, and the yield point reduced by at least 80%. After adding 1% oleamide type thinner into the base mud treated with 15.5% asphalt, the yield point of the base mud was reduced by at least 73%. These experimental results indicate that oleamide is able to disassemble the network structure formed by the low quality solids in the mud. An oil based mud (density 2.25 g/cm3) sample was taken from a well and was treated with 1% oleamide thinner, the viscosity and yield point of the mud were reduced by 15% and at least 30%, respectively. The major role of the oleamide thinner in the oil based mud sample is to disassemble the network structure formed by the low quality solids in the mud, the mechanism of viscosity reducing is the same as that of the mud contaminated with excessive amount of organophilic clay and asphalt. Rheology test at high temperature high pressure conditions has shown that at 205 °C, oleamide can still reduce the viscosity of an old oil based mud by 4.76% and the yield point of the old oil based mud by 8.70%. The oleamide thinner disassembles the excessive network structure in the mud taken from the rig-site and effectively improves the rheology of the mud.

     

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