Volume 39 Issue 1
May  2022
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ZHANG Xuemei, ZHANG Guilei, GUO Xiaoxuan, et al.Effect of water on BaSO4 particles/GTL suspensions[J]. Drilling Fluid & Completion Fluid，2022, 39（1）：1-7 doi: 10.12358/j.issn.1001-5620.2022.01.001
Citation: ZHANG Xuemei, ZHANG Guilei, GUO Xiaoxuan, et al.Effect of water on BaSO4 particles/GTL suspensions[J]. Drilling Fluid & Completion Fluid，2022, 39（1）：1-7 doi: 10.12358/j.issn.1001-5620.2022.01.001
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Effect of Water on BaSO4 Particles/GTL Suspensions

doi: 10.12358/j.issn.1001-5620.2022.01.001
  • 1.

    Oilfield Chemical R & D institute, China Oilfield Services Limited, Yanjiao, Hebei 065201

  • 2.

    Tianjin Key Laboratory of Offshore Oil Environment and Low Damage Drilling and Completion Fluid for Reservoir, Binhai New Area of Tianjin, Tianjin 300450

  • 3.

    Key Laboratory of Colloid and Interface Chemistry, Ministry of Education, Shandong University, Jinan, Shandong 250100

  • Received Date: 2021-08-09
  • Rev Recd Date: 2021-10-15
    • Available Online: 2022-04-19
  • Publish Date: 2022-05-06
    Abstract
  • The dispersion state of weight material has a great effect on the rheology of oil based drilling fluids. In laboratory experiment, the effects of water on the settling stability and the viscosity of the suspension were studied. The suspension used in the experiments was formulated with fatty alcohol polyoxyethylene ether carboxylic acid (C12E9Ac) as the dispersant, BaSO4 as the dispersed phase and a gas to liquids (GTL) as the dispersing medium. It was found through the experiments that with the increase in the water content in the suspension, the dominant forces between the dispersed particles can be turned from repulsive force to attractive force. When the water is added in a concentration that is less than 0.5%, the settling stability and viscosity of the suspension are almost not affected, and the re-dispersibility of the suspension is enhanced. When the water is added at a concentration between 0.5% and 2.5%, water will not only cause the particles in the suspension to aggregate, the “big particles” formed by the aggregation of the particles will connect with each other through water bridge to form a complex network structure. When the water is added at a concentration greater than 25%, part of the particles in the suspension is dispersed in the water phase, decreasing the network structures formed by the particles, and hence the viscosity of the suspension. Thus, adding some water into a suspension stabilized by the C12E9Ac will help improve the re-dispersibility of the sediments in the suspension without disturbing the dispersion stability and viscosity of the suspension. The conclusions drawn from these experiments have provided a research method for controlling the settling stability of the particles in an oil based drilling fluid.

     

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