Volume 38 Issue 6
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LONG Huaiyuan, CHEN Wu, LIU Gang, et al.Research on evaluation device and method of emulsification stability of high temperature and high pressure oil-based drilling fluid[J]. Drilling Fluid & Completion Fluid，2021, 38（6）：738-742 doi: 10.12358/j.issn.1001-5620.2021.06.012
Citation: LONG Huaiyuan, CHEN Wu, LIU Gang, et al.Research on evaluation device and method of emulsification stability of high temperature and high pressure oil-based drilling fluid[J]. Drilling Fluid & Completion Fluid，2021, 38（6）：738-742 doi: 10.12358/j.issn.1001-5620.2021.06.012
shu

Research on Evaluation Device and Method of Emulsification Stability of High Temperature and High Pressure Oil-based Drilling Fluid

doi: 10.12358/j.issn.1001-5620.2021.06.012
  • 1.

    College of Chemistry and Environmental Engineering, Yangtze University, Jingzhou, Hubei 434023

  • 2.

    Sinopec Research institute of Petroleum Engineering, Beijing 100101

  • 3.

    China National Petroleum Corporation Engineering Technology Research Institute Co., Ltd., Beijing 102206

  • Received Date: 2021-07-22
  • Publish Date: 2021-11-30
    Abstract
  • The high temperature and high pressure oil-based drilling fluid emulsion stability evaluation instrument is mainly composed of high temperature and high pressure stainless steel chamber, test electrode, temperature control system, pressure control system and test system. The high temperature electrode is made of PEEK material. The test electrode distance is designed to be 1.55 mm. The maximum discharge voltage is designed to be 2000 V, and the voltage change rate is 150±10V persecond. The temperature control system is based on the T89C51 single-chip microcomputer. The cast aluminum electric heater is used to wrap the outside of the test vessel for heating. The pressure control system uses hydraulic pressure. The stability test of the instrument and the comparison test with the electrical stability tester under normal temperature and pressure are carried out. The results show that the instrument can realize the evaluation of the emulsion stability of oil-based drilling fluid at high temperature and high pressure, and the test data is stable and reliable, with measurement errors ≤5%. The emulsification stability of oil-based drilling fluid under high temperature and high pressure conditions is studied. When the pressure is kept constant, the demulsification voltage decreases with the increase of temperature. When the temperature is below 120 ℃, the demulsification voltage decreases with the increase of pressure. When the temperature reaches above 120 ℃, the demulsification voltage does not change with the pressure.

     

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