Volume 39 Issue 5
Jan.  2023
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SONG Hanxuan, YE Yan, ZHOU Zhishi, et al.Development of paraffin microemulsion and its application in water-based drilling fluids[J]. Drilling Fluid & Completion Fluid,2022, 39(5):550-557 doi: 10.12358/j.issn.1001-5620.2022.05.004
Citation: SONG Hanxuan, YE Yan, ZHOU Zhishi, et al.Development of paraffin microemulsion and its application in water-based drilling fluids[J]. Drilling Fluid & Completion Fluid,2022, 39(5):550-557 doi: 10.12358/j.issn.1001-5620.2022.05.004

Development of Paraffin Microemulsion and Its Application in Water-Based Drilling Fluids

doi: 10.12358/j.issn.1001-5620.2022.05.004
  • Received Date: 2022-04-03
  • Rev Recd Date: 2022-04-23
  • Publish Date: 2023-01-10
  • Analyses of seepage losses through micron and nanometer fractures and pores encountered in ultra-deep drilling in the southwest Tarim Basin show that the plugging agents in the potassium based polymer sulfonate drilling fluid are unable to effectively plug these fractures and pores. To improve the particle sizing for better plugging, a paraffin microemulsion was developed in laboratory. The optimum conditions for the development of the microemulsion was determined through particle size comparison method. It was found through experiment that the optimum quantity ratio of “S+A” : paraffin is 9:1, the optimum agitation speed is 1400 r/min, and the optimum reaction temperature is 120 ℃. The microemulsion thus prepared has D50 particle size of about 2.9 μm, monodisperse particle sizes between 200 nm and 300 nm, surface tension between 45.0 mN/m and 47.5 mN/m, and stable time up to 30 d. The potassium based polymer sulfonate drilling fluid was then optimized with the microemulsion, and good compatibility between them was seen after mixing. The optimized drilling fluid has its apparent viscosity reduced by 3.5 mPa·s, filtration rate reduced by 3.5 mL, thickness of mud cake reduced by 1 mm, and the filtration and wall building performance of the drilling fluid was enhanced. Evaluation of the plugging capacity of the paraffin microemulsion by pressure transmission methos shows that the paraffin microemulsion can be used to improve the pressure bearing capacity of the formation; test of the paraffin microemulsion on plugging the Keziluoyi dense sandstone shows that 58.4% of the microfractures and pores were plugged, indicating that the paraffin microemulsion has good plugging capacity

     

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