Volume 40 Issue 4
Jul.  2023
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Article Navigation >  DRILLING FLUID & COMPLETION FLUID  > 2023  >  40(4): 511-518
MENG Renzhou, MOU Shaomin, LI Yuan, et al.Preparation and evaluation of a nanometer emulsion flushing spacer[J]. Drilling Fluid & Completion Fluid，2023, 40（4）：511-518 doi: 10.12358/j.issn.1001-5620.2023.04.014
Citation: MENG Renzhou, MOU Shaomin, LI Yuan, et al.Preparation and evaluation of a nanometer emulsion flushing spacer[J]. Drilling Fluid & Completion Fluid，2023, 40（4）：511-518 doi: 10.12358/j.issn.1001-5620.2023.04.014
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Preparation and Evaluation of a Nanometer Emulsion Flushing Spacer

doi: 10.12358/j.issn.1001-5620.2023.04.014
  • 1.

    CNPC Engineering Technology R&D Company Limited, Beijing 102206

  • 2.

    CNPC Greatwall Drilling Company Inter-national Division, Beijing 100101

  • 3.

    Engineering Department of Petrochina Xinjiang Oilfield Company, Kelamayi，Xinjiang 834000

  • 4.

    School of Petroleum Engineering, China University of Petroleum (East China), Qingdao, Shandong 266580

  • Received Date: 2023-01-30
  • Rev Recd Date: 2023-03-02
  • Publish Date: 2023-07-30
    Abstract
  • Oil based drilling fluids have been widely used in drilling unconventional wells, and one of the key problems with the use of oil based drilling fluids is how to effectively clean off the residue mud and the mud cakes on the borehole wall to provide a good bonding surface for cement slurries. Nanometer emulsion has low surface tension, small droplets and strong solubilization capacity, making it a good flushing fluid for cleaning residue oil based drilling fluids. Take the flushing efficiency and the sizes of the emulsion droplets as the evaluation criteria, a nanometer emulsion was selected as a flushing fluid for residue oil based mud cleaning. By testing the stability, electric potential and sizes of the droplets, the compatibility of the emulsion and spacer additives was analyzed, and a nanometer emulsion flushing spacer was formulated as a result of the study. Laboratory studies show that by changing the ratio of two surfactants, which are alkyl glycoside and polyoxyethylene ether, from 2∶8 to 9∶1, the flushing efficiency of the nanometer emulsion first increased and then decreased, the sizes of the droplets first decreased and then increased. The consistency between the flushing efficiency and small droplet size of the nanometer emulsion provides a theoretical basis for selecting an emulsion with both high flushing efficiency and dynamic stability. Some polymer additives will increase the viscosity of the nanometer emulsion and the oil-water interfacial tension, but do not significantly affect the stability of the nanometer emulsion. Surfactants with opposite charges will decrease the Zeta potential of a nanometer emulsion droplet, leading to a decrease of the stability of the nanometer emulsion. Commonly additives can be directly used to control of properties of a nanometer emulsion and to make nanometer emulsion flushing spacers. The spacer formulated in this study has stable rheology, high settling stability and good compatibility with cement slurries at temperatures up to 100 ℃. At 120 ℃, the spacer has flushing efficiency in 3 min of more than 99% and is able to remarkably enhance the bonding strength of the cement sheaths on the walls of the borehole drilled with an oil based drilling fluid.

     

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