Volume 40 Issue 1
Jan.  2023
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QIU Zhengsong, WANG Di, ZHANG Shuhao, et al.Specific surface area measurement and adsorption characteristics of drilling fluid weighting materials[J]. Drilling Fluid & Completion Fluid,2023, 40(1):20-27 doi: 10.12358/j.issn.1001-5620.2023.01.002
Citation: QIU Zhengsong, WANG Di, ZHANG Shuhao, et al.Specific surface area measurement and adsorption characteristics of drilling fluid weighting materials[J]. Drilling Fluid & Completion Fluid,2023, 40(1):20-27 doi: 10.12358/j.issn.1001-5620.2023.01.002

Specific Surface Area Measurement and Adsorption Characteristics of Drilling Fluid Weighting Materials

doi: 10.12358/j.issn.1001-5620.2023.01.002
  • Received Date: 2022-09-15
  • Rev Recd Date: 2022-10-06
  • Publish Date: 2023-01-31
  • In deep and ultra-deep drilling, weighting materials are added to the drilling fluids to produce a pressure that is enough to balance the formation pressure. Weighting materials added to a drilling fluid can adsorb water and additives, thus affecting and even exacerbating the properties of the drilling fluid. To investigate the form and adsorptive characteristics of weighting materials in a drilling fluid, a method of measuring the specific surface area of a weighting material in a liquid has been established based on low-field nuclear-magnetic resonance (LF-NMR). The specific surface area of a weighting material in water based drilling fluids with densities between 1.1 g/cm3 and 2.4 g/cm3 and the specific surface area of the same weighting material in dry powder state, and the change of the specific surface area of the weighting material in liquid and as dry powder were analyzed using the LF-NMR method and particle size estimation method. The adsorption capacity of a weighting material in fluids of different densities were investigated through organic carbon adsorption experiment and rheology measurement. It was found that the weighting material in fluids of different densities has different adsorption capacities for different mud additives. In three 500 mL drilling fluids, each of which has a density of 1.2 g/cm3, 1.8 g/cm3 and 2.4 g/cm3, respectively, the adsorption capacities of the weighting material for sulfonated lignite were 10.83 g, 13.06 g and 17.69 g, respectively. This testing result can be correlated with the specific surface area results obtained with LF-NMR.

     

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