Session: 11-01-01 Well Drilling Technology

Paper Number: 120719

120719 - Study of the Influence of Pre-Drilled Holes on Weakening the Rocks and Enhancing the Rate of Penetration 

This Improving drilling Rate Of Penetration (ROP) is a target for oil and gas drilling companies. However, efficient drilling performance is not only measured by the improvement of ROP, but also by minimizing the mechanical specific energy, minimizing the bit wear rate, minimizing Non-Productive Time (NDP) impacted by pre-mature bit wear and failure, and by reducing an overall drilling cost. Another approach of improving drilling performance is through optimal applications of drilling parameters including sufficient fluid flow rate for efficient hole cleaning and bit ball prevention, applying adequate Weight On Bit (WOB) that induces effective Depth Of Cut (DOC) without negatively inducing the bit wear rate to increase, at optimal rotary speed. This research focuses on applying various techniques through multi stage drilling and coring in high strength formation using PDC bits and natural diamond impregnated coring bits to investigate micro cracks generation. The analysis of drilling and coring data includes evaluation of input drilling parameters such WOB and rotational speed as well as the output data of ROP, DOC, torque, etc. The drilling experiments were laboratory based using a large lab scale of a fully instrumented drilling simulator. A high strength rocks were drilled, and water flow rate was used. Different applied WOB and rotational speeds were applied. The results of the analyzed data indicated variation in ROP (increasing and decreasing when drilling different stages at the same conditions of applied parameters. ROP was increased parallel to the predrilled section, where the ROP was found decreases when drilling the un-predrilled section. Corresponding data of torque also supported the ROP increase vs. which was influenced by possible rock weakened due to possible micro cracks generation in the predrilled section. Data analysis, results, and conclusions are reported.

Presenting Author: Abdelsalam Abugharara Memorial University of Newfoundland

Presenting Author Biography: Dr. Abdelsalam Abugharar got his Masters and Doctoral Degrees in Oil and Gas Engineering from Memorial University of Newfoundland, Canada in 2008 and 2019, respectively and got his bachelor degree in petroleum engineering from the Bright Start University of Technology, Libya in 2000. After he obtained his Ph. D., Dr. Abugharar worked in the Drilling Technology Laboratory at Memorial University of Newfoundland as a postdoctoral fellow for 3.5 years, then he worked as a project and research engineer till present. As a work background, Dr. Abugharar worked as a Petroleum Production Engineer at the Arabian Gulf Oil Company, Libya from 2001 and 2010, worked as a assistant lectured in Sebha University in Libya from 2010 to 2013, and was appointed as a per-course instructor for 4 semesters at Memorial University of newfoundland between 2016 and 2018 where he taught undergraduate and graduate level courses in the process engineering department at MUN.
His area of research is linked to but not limited to:
Petroleum Engineering
Drilling Engineering
Production Engineering
Rock mechanics
Rock characterization
Dr. Abugharar has more than 35 publications and more than 100 citations for his conference and journal publications.

Authors:

Abdelsalam Abugharara Memorial University of Newfoundland
Abourawi Alwaar Memorial University of Newfoundland
Ibrahim Futheiz Memorial University of Newfoundland
Stephen Butt Memorial University of Newfoundland