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Modeling and Laboratory Evaluation of Rheological Properties of Water based Mud for Horizontal Extended Reach Well

Latifi Shirdar, Babak | 2020

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 53290 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Taghikhani, Vahid; Ghazanfari, Mohammad Hossein; Tahmasbi Nowtarki, Koroush; Kalhor, Mojtaba
  7. Abstract:
  8. One of the most important challenges in drilling horizontal and directional wells is the optimization of hydraulics and hole cleaning and ECD management. In these wells, poor hole cleaning can lead to formation of cutting bed on the low side of the annulus and cause problems such as stuck pipe or increase in torque and drag. Also poor hydraulic design can lead to decrease in rate of penetration and thus, increase in costs. Mud weight should be placed inside the range of mud window (more than pore pressure and less than formation fracture pressure) in order to prevent kick of reservoir fluid or mud loss.In this thesis, the main goal is to optimize hydraulics and hole cleaning and manage ECD in order to obtain rheological properties of the optimum mud for horizontal extended reach wells. The important point is that we just work on rheological parameters of drilling fluid and other parameters including operational parameters and drilling fluid parameters like mud weight are considered fixed.In this project, Landmark software and Design Expert software are coupled to each other in order to model the well and optimize hydraulic, hole cleaning and equivalent circulating density. Research method states that at first, we receive drilling data including operational parameters and drilling fluid parameters from operation section and determine rheological model of the drilling fluid and then enter these data in Landmark software and model the well. Then model hydraulic indicator, hole cleaning indicator and equivalent circulating density indicator versus rheological parameters of the drilling fluid using Design Expert software and optimize the models using optimum ranges and obtain rheological properties of the optimum drilling fluid. This research method is done on 8 1⁄2 inch hole section and 6 1⁄8 inch hole section of a horizontal well in South Azadegan field and also on 8 1⁄2 inch hole section of a directional well in South Pars field and rheological properties of the optimum mud is obtained in each case. Also we have increased horizontal displacement of 6 1⁄8 inch hole section of the horizontal well in South Azadegan field in several steps and evaluated performance of optimum mud at each step and reperformed optimization process in order to obtain rheological properties of new optimum mud if necessary.We should formulate the optimum mud in laboratory after obtaining its rheological parameters and rheological profile. In fact, we should formulate a mud whose rheological profile is as same as possible to the rheological profile of optimum mud using different concentrations of different additives in laboratory. This methodology is done for 8 1⁄2 inch hole section of the horizontal well in South Azadegan field and formulation of the optimum mud is obtained
  9. Keywords:
  10. Horizontal Wells ; Hole Cleaning ; Hydraulics ; Optimization ; Rheological Parameters ; Water-Based Drilling Fluid ; Mud Weight

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