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Experimental Analysis of Effective Parameters in Hole Cleaning of Directional Wells While Drilling

Sarafraz, Siyamak | 2015

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  1. Type of Document: M.Sc. Thesis
  2. Language: English
  3. Document No: 47273 (66)
  4. University: Sharif University of Technology, International Campus, Kish Island
  5. Department: Science and Engineering
  6. Advisor(s): Jamshidi, Saeed; Molaei Dehkordi, Asghar
  7. Abstract:
  8. One of the major problems in directional and extended reach wells is poor hole cleaning. Directional and horizontal drilling is more complex than vertical wells. Ineffective particles transport leads to several undesirable issues during drilling. This thesis analyzed all parameters which have directly affected directional hole cleaning. The thesis is based on an experimental set-up designed in Sharif University. In the experimental work, two types of drilling fluid, Newtonian and Non-Newtonian with numerous rheological parameters, three different flow rate, three various nozzle sizes and three individual RPMs in three distinct inclinations 30°, 60° and 90° were used to simulate. Also, to enhance the accuracy of the obtained results, all time of tests were recorded and after that by using Image Processing Mat Lab Tools Kits, all video records converted to RGB images and converted to Gray scale images. By using edge detection technique in Image Processing Tools Kits and by use of images obtained, bed particles formation and solids behavior in directional wells can be more accurately assessed. In order to convince, this experimental work was compared with a mathematical model that this is based on Larsen model. Also to enhance the precision some parameters have been modifiedaccording to experimental model. In conclusion, several methods and how it is possible to improve hole cleaning are listed
  9. Keywords:
  10. Rheology ; Cutting Transport ; Slip Velocity ; Drilling ; Optimization ; Directional Wells ; Hole Cleaning

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