Volume 38 Issue 4
Jul.  2021
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LIU Gang, JIANG Chao, LI Chao, et al.Study on high temperature stability of invert emulsion[J]. Drilling Fluid & Completion Fluid,2021, 38(4):404-411 doi: 10.12358/j.issn.1001-5620.2021.04.002
Citation: LIU Gang, JIANG Chao, LI Chao, et al.Study on high temperature stability of invert emulsion[J]. Drilling Fluid & Completion Fluid,2021, 38(4):404-411 doi: 10.12358/j.issn.1001-5620.2021.04.002

Study on High Temperature Stability of Invert Emulsion

doi: 10.12358/j.issn.1001-5620.2021.04.002
  • Received Date: 2021-03-26
    Available Online: 2023-11-09
  • Publish Date: 2021-07-31
  • The effects of the oil/water interface activity and temperature on two emulsifiers RHJ-I and RHJ-II were studied. An invert emulsion (W/O) was formulated with a synthetic oil (made in China) as the base oil, 25% CaCl2 solution as the water phase and a certain amount of Ca(OH)2. The composition of the emulsion and the effects of aging temperature and the temperature at which the emulsion stand still were investigated, and the stability mechanisms of the emulsion were studied. The results of the investigation and study show that RHJ-I and RHJ-II are able to reduce the interfacial tension between the synthetic oil and water, forming a viscoelastic interfacial film at the interface between the oil and water. The invert emulsion has good dispersion stability, and a synergistic action which improvs the stability can be found between RHJ-I and RHJ-II. After being aged at 180 °C and 232 °C, the stability of the emulsion was found enhanced, probably because of the production of an “organic Ca(OH)2” by the reaction between the emulsifiers and Ca(OH)2 which helps improve the high temperature stability of the emulsion. The stability of the emulsion is significantly enhanced when the oil/water ratio is between 1∶9 and 5∶5.

     

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