Volume 34 Issue 4
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ZHANG Yang. Research and Application of High Temperature Inverse Emulsion Viscosifier DVZ-1[J]. DRILLING FLUID & COMPLETION FLUID, 2017, 34(4): 20-25. doi: 10.3969/j.issn.1001-5620.2017.04.004
Citation: ZHANG Yang. Research and Application of High Temperature Inverse Emulsion Viscosifier DVZ-1[J]. DRILLING FLUID & COMPLETION FLUID, 2017, 34(4): 20-25. doi: 10.3969/j.issn.1001-5620.2017.04.004
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Research and Application of High Temperature Inverse Emulsion Viscosifier DVZ-1

doi: 10.3969/j.issn.1001-5620.2017.04.004

  • Research Institute of Drilling Engineering Technology, Daqing Drilling Engineering Corporation, Daqing, Heilongjiang 163413

  • Received Date: 2017-01-09
  • Publish Date: 2017-07-31
    Abstract
  • A high temperature inverse emulsion viscosifier DVZ-1 has been developed to resolve the mud rheology deterioration at elevated temperatures in deep wells drilled in the east Tarim area, Xinjiang. DVZ-1 was synthesized with AMPS, DMAM and NVP through inverse emulsion polymerization (a redox system), with white oil as the oil phase. The optimum ratio of the monomers, initiator and reaction temperature for the polymerization were studied, and the synthesized product was characterized with IR spectroscopy, thermogravimetric analysis and gel chromatography. The viscosifying performance, high temperature stability and filtration control ability of DVZ-1 were evaluated, and the working mechanisms of DVZ-1 analyzed through laboratory experiments. The optimum polymerization conditions were as follows:monomers' mass fraction=50% (based on the mass of the water phase), concentration of the initiator=0.2%, oil/water ratio=11, mass fraction of the compound emulsifier=7% (based on the mass of the oil phase), molar ratio of the monomers was AMPS:DMAM:NVP=1:4:0.5, pH=8, reaction temperature=50℃, and reaction time=6 h. DVZ-1 has good thermal stability, and properly functions at 220℃. DVZ-1 is a good viscosifier and a good filter loss reducer in fresh water, saltwater and saturated drilling fluids. It has been used successfully on 6 wells, such as the well GC14 (east Tarim, Xinjiang) and the well XS7-H1 (Daqing oilfield). Problems such as mud thinning at elevated temperatures and difficulties in cuttings carrying through narrow annulus were resolved, ensuring the success of the drilling operation.

     

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