2025

• Conference lecture
  Sangesland, Sigbjørn; Elahifar, Behzad. (2025) Can Bismuth plugs become a feasible alternative to cement plug?. 2nd Quarter 2025 DEA meeting
• Conference lecture
  Anunciacao Jaculli, Marcelo; Hmadeh, Lewaa; Sangesland, Sigbjørn; Elahifar, Behzad. (2025) Qualification of bismuth-based plugs for plugging and abandonment: where do we stand?. OMAE2025
• Lecture
  Elahifar, Behzad; Hmadeh, Lewaa; Essén, Tora; Sangesland, Sigbjørn. (2025) Evaluating the Performance of a Cost-Effective Creep Testing Setup on Bismuth-Tin Alloy Specimens: Challenges and Future Directions. SPE/IADC International Drilling Conference and Exhibition

2024

• Conference lecture
  Elahifar, Behzad; Ibrahimli, Javidan. (2024) Innovative Strategies for Well Integrity in Offshore Top-Hole Cementing: Laboratory-Validated Success in Shallow Gas Mitigation. Society Petroleum Engineers

2023

• Conference lecture
  Elahifar, Behzad; Gomar, Mostafa. (2023) Real-Time Prediction and Detection of Drilling Bit Issues Based on Along-String Measurements (ASM) Along Wired Pipes - A Case Study. Society Petroleum Engineers

2022

• Lecture
  Gomar, Mostafa; Elahifar, Behzad. (2022) Real-Time Fault, Symptom Diagnosis and Drilling Events Prediction Using Wired Pipe During Operation - Cutter Force Modeling of Pdc (polycrystalline Diamond Compact) Bits. IADC/SPE International Drilling Conference and Exhibition
• Lecture
  Sangesland, Sigbjørn; Vedvik, Noralf; Opedal, Nils van der Tuuk; Elahifar, Behzad. (2022) Bismuth based barrier materials –Initial results from 3rd party testing in SWIPA. 10th Norwegian Plug & Abandonment Seminar
• Conference lecture
  Elahifar, Behzad; Gomar, Mostafa. (2022) Understanding Thermo-Poroelastic Mechanical Stress Induced Damages in Network of Pre-Existing Fractures During Drilling Operation. IADC/SPE Asia Pacific Drilling Technology Conference and Exhibition

2018

• Lecture
  Elahifar, Behzad; Claudey, Eric; Fossli, Børre; Qiang, Zhizhuang; Olsen, Max; Mo, Jakob. (2018) Experience Using Managed Pressure Cementing Techniques with Riserless Mud Recovery and Controlled Mud Level in the Barents Sea. Bergen SPE one day conference

2017

• Conference lecture
  Elahifar, Behzad. (2017) Successful Deep Water Drilling (MPD), Early Kick Detection and Performing Managed Pressure Cementing With CML (Controlled Mud Level) System in GOM and North Sea. SPE/IADC Conference and Exhibition

2014

• Conference lecture
  Elahifar, Behzad; Fasch, Franz; Thonhauser, Gerhard. (2014) Real Time Kick Detection And Also Increasing Ultrasonic Caliper Accuracy By Measuring Speed Of Sound Within Drilling Fluid In The Downhole Condition. SPE Annual Technical Conference and Exhibition
• Lecture
  Elahifar, Behzad; Fasch, Franz; Tollschein, Christian; Thonhauser, Gerhard. (2014) Real Time Kick Detection Applying an Ultrasonic Caliper Featuring a Downhole Sonic Speed Measurement for Calibration Purposes. SPE Saudi Arabia Section Technical Symposium and Exhibition

2013

• Lecture
  Elahifar, Behzad; Esmaeili, Abdolali; Thonhauser, Gerhard. (2013) Real Time Data Transmission Method for Creating 4D Wellbore Images to Monitor Wellbore Shape and Detecting Instabilities. Kuwait SPE Oil and Gas show and conference
• Lecture
  Elahifar, Behzad; Esmaeili, Abdolali; Fruhwirth, Rudolf; Thonhauser, Gerhard. (2013) Formation Evaluation based on Drill String Vibration Measurements Using Laboratory Scale Rig. SPE/IADC Middle East Drilling Technology Conference and Exhibition
• Lecture
  Elahifar, Behzad; Esmaeili, Abdolali; Fruhwirth, Rudolf; Thonhauser, Gerhard. (2013) Real Time Determination of the Instability in the Borehole by Using 4D Images of the Wellbore with High Accuracy Ultrasonic Caliper. SPE/IADC Middle East Drilling Technology Conference and Exhibition
• Conference lecture
  Elahifar, Behzad; Esmaeili, Abdolali; Thonhauser, Gerhard; Fruhwirth, Rudolf. (2013) Experimental Determination of Wellbore Diameter and Shape (4D Imaging of Wellbore) by Using Ultrasonic Caliper within Different Fluids for Real-Time Drilling Application. Oil Gas European Magazine
• Conference lecture
  Elahifar, Behzad; Esmaeili, Abdolali; Thonhauser, Gerhard; Fruhwirth, Rudolf. (2013) Wellbore Instability Monitoring by Using 4D Imaging of Ultrasonic Caliper Logs in Real Time Drilling. Society Petroleum Engineers
• Conference lecture
  Elahifar, Behzad; Esmaeili, Abdolali; Thonhauser, Gerhard; Fruhwirth, Rudolf. (2013) Effect of Formations Compressive Strength on Drill String Vibrations. Society Petroleum Engineers
• Conference lecture
  Elahifar, Behzad; Esmaeili, Abdolali; Thonhauser, Gerhard. (2013) Formation Changes Recognition by Real-time Monitoring of Drill String Vibrations and Mechanical Specific Energy. International Conference for Advanced Drilling Technology

2012

• Conference lecture
  Elahifar, Behzad; Esmaeili, Abdolali; Thonhauser, Gerhard; Fruhwirth, Rudolf. (2012) Laboratory Scale Control of Drilling Parameters to Enhance Rate of Penetration and Reduce Drill String Vibration. Society Petroleum Engineers
• Conference lecture
  Elahifar, Behzad; Esmaeili, Abdolali; Thonhauser, Gerhard; Fruhwirth, Rudolf. (2012) Experimental Evaluation of Real Time Mechanical Formation Classification using Drill String Vibration Measurements. Society Petroleum Engineers
• Conference lecture
  Elahifar, Behzad; Esmaeili, Abdolali; Thonhauser, Gerhard; Fruhwirth, Rudolf. (2012) Experimental Determination of Wellbore Diameter and Shape by Using Ultrasonic Caliper Within Different Fluids for Real Time Drilling Application. International Conference for Advanced Drilling Technology Celle Drilling
• Conference lecture
  Elahifar, Behzad; Esmaeili, Abdolali; Thonhauser, Gerhard; Fruhwirth, Rudolf. (2012) Axial Vibration Monitoring in Laboratory Scale Using CDC miniRig and Vibration Sensor Sub. IEEE, I2MTC
• Conference lecture
  Elahifar, Behzad; Esmaeili, Abdolali; Thonhauser, Gerhard; Fruhwirth, Rudolf. (2012) Using Neural Network Technique to Study the Effect of Formation's Mechanical Properties on Dynamic Behavior of Drill String. International Conference for Advanced Drilling Technology Celle Drilling
• Conference lecture
  Elahifar, Behzad; Esmaeili, Abdolali; Thonhauser, Gerhard; Fruhwirth, Rudolf. (2012) ROP Modeling Using Neural Network and Drill String Vibration Data. Society Petroleum Engineers
• Conference lecture
  Elahifar, Behzad; Esmaeili, Abdolali; Thonhauser, Gerhard; Fruhwirth, Rudolf. (2012) Determining the Accuracy of Ultrasonic Caliper Measurements for Real Time Drilling Application. Society Petroleum Engineers
• Conference lecture
  Elahifar, Behzad; Esmaeili, Abdolali; Thonhauser, Gerhard; Fruhwirth, Rudolf. (2012) Accuracy of Ultrasonic Sensor in Caliper Log. IEEE, I2MTC
• Conference lecture
  Elahifar, Behzad; Esmaeili, Abdolali; Thonhauser, Gerhard; Fruhwirth, Rudolf. (2012) Real Time Measurement of Borehole Shape and Diameter by Using Ultrasonic Caliper in Different Drilling Fluid and Wellbore Conditions for Detecting Instabilities. Society Petroleum Engineers

2011

• Conference lecture
  Elahifar, Behzad; Esmaeili, Abdolali; Thonhauser, Gerhard; Prohaska, Michael. (2011) A Comparison of Specific Energy Consumption for Alternative and Conventional Drilling Methods. International Conference for Advanced Drilling Technology Celle Drilling
• Conference lecture
  Elahifar, Behzad; Esmaeili, Abdolali; Thonhauser, Gerhard; Prohaska, Michael. (2011) An Energy Based Comparison Drilling Method. Society Petroleum Engineers

2005

• Conference lecture
  Elahifar, Behzad; Naderian, Mohammad Amin; Hosseinzadeh, Ahmad. (2005) Application of Drilling Optimization- A Case Study for a Well in an Iranian Offshore Oil Field. Iranian Petroleum Engineering Student Conference