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Laboratory-Scale Design and Evaluation of Polymer-Fiber Composite in Order to Control Lost Circulation In Drilling Fluid

Abdollahi, Maryam | 2018

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 50489 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Ghotbi, Cyrus; Jafari, Taraneh; Nasiri, Alireza
  7. Abstract:
  8. During the over balanced drilling operation in high permeability or fractured formations, drilling fluid loss and in more severe occasions fluid lost occurs which causes many problems and dangers and delayed the drilling operation until it was repaired. On the one hand, because of the high value of this material, and on the other hand, due to the increase in rig/day costs resulting from lost circulation control, leads to a significant increase in drilling costs. In this research, polymer-fiber composites have been designed and manufactured using extrusion method and have been investigated as fluid lost control agent in the laboratory scale for the first time in Iran. The effective parameters on the efficiency of fluid lost control including concentration and granular distribution have been evaluated. In order to quality control and efficiency of fibers and polymer-fiber composites several experiments have been conducted with different concentration and granular distribution. Also, in order to better analyze the results and study the morphology of the fracture surfaces and polymer-fiber connection area, the cross sections of the tensile samples were studied by scanning electron microscope (SEM). After analyzing the results, evidences indicate that the combination of fibers and polymer create a suitable and persistent barrier inside the fractures. Optimal selection of materials size distribution leads to bridging on fractures mouth by the larger particles and filling the empty space and leakage blocking by smaller particles
  9. Keywords:
  10. Lost Circulation ; Polymeric Fiber ; Drilling Fluid ; Filtration Loss ; Loss Circulation Materials (LCM)

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