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Simulation of Dual Lateral Logging Tool and Case Study on Estimating Drilling Fluid Invasion Depth and Initial Formation Resistivity in COMSOL Simulation Software

Kiani, Moein | 2025

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 58530 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Bazargan, Mohammad
  7. Abstract:
  8. Simulation of logging tools can predict the tool's response under various conditions for petroleum engineers. One of the achievements of logging tool simulation is the prediction of tool behavior and the ability to interpret logs under different conditions. This is achieved by simulating the tool in various scenarios and collecting the log responses. Additionally, it can be utilized for validating the interpretations made. In this study, a dual lateral logging tool simulation has been conducted. This tool is applicable in wells containing drilling fluids with electrical conductivity. Given the impossibility of implementing the main focusing process of the tool, a novel method for numerically implementing the logging operation for a specific device and a model with limited extent in a heterogeneous environment has been developed. In this research, considering the differential equations, specified boundary conditions, and steady flow in the surrounding environment of the tool, the finite element method has been employed to solve the governing Laplace equation for electrical flow in the material, using COMSOL software. Due to the comprehensiveness of the method presented in this study, it can also be generalized to other tools in this category. Following the successful simulation of the tool and the validation of the efficiency and accuracy of the method, the results of the numerical simulation of the dual lateral log response are presented, focusing on determining the penetration depth of the drilling fluid into the formation and assessing the uninvaded formation resistivity after the invasion of the drilling fluid. Based on the numerical simulation results, the response of this tool is influenced by various parameters, including borehole radius, resistivity against the drilling fluid, filter cake invasion radius, and resistivity of the invaded zone. Finally, considering the effective parameters, a chart for estimating the penetration depth of the drilling fluid into the formation and the uninvaded formation resistivity has been created, referred to as a tornado chart for a specific case
  9. Keywords:
  10. Simulation ; Logging While Drilling ; COMSOL Software ; Electrical Resistivity Log ; Drilling Fluid ; Tornado Chart ; Drilling Fluid Invasion

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