Papers by Abourawi Malid Alwaar
The objective of this work is to evaluate the influence of the implementing the downhole Passive ... more The objective of this work is to evaluate the influence of the implementing the downhole Passive Vibration Assisting Rotary Drilling (pVARD) Tool on enhancing drilling performance using a numerical study utilizing a Particle Flow Code (PFC-2D). The work is comprised of a numerical study of a simulation using the PFC-2D on an experimental work described in ARMA 15-492 (Rana et al, 2015). The numerical study was performed to validate the experimental work following the steps, procedure, and conditions performed in the laboratory work. The numerical study of the laboratory work involves not only the evaluation of drilling rate of penetration (ROP), but it also includes the Depth of Cut (DOC) of the bit cutters and the Mechanical Specific Energy (MSE). This numerical work also includes comparison study of drilling performance under various configurations of the pVARD tool, which represents a controlled downhole vibration against the rigid drilling configuration that represents the conventional rotary drilling. The pVARD configurations involves pVARD low spring compliance, medium spring compliance, and high spring compliance. The drilling output parameters of DOC, MSE, and ROP are then studied and analyzed in all pVARD and non-pVARD configurations. Likewise of the experimental work, the result of the numerical simulation approves the experimental work and it indicates the positive effect of utilizing the downhole pVARD on improving ROP. The drilling performance enhancement is also supported by the DOC and the MSE result.
As drilling performance is a key indicator of success in the oil and gas industry, numerous acade... more As drilling performance is a key indicator of success in the oil and gas industry, numerous academic and industry organizations have been researching how to improve drilling with regard to time and efficiency. A study is done to determine rock isotropy by applying mechanical and physical measurements, along with oriented drilling, as anisotropy has a distinct impact in drill performance. Based on these findings, the study then performs drilling experiments on anisotropic rock in order to gauge the effect of anisotropy on drill efficiency. The tests employ a dual-cutter PDC bit, 35 mm, and use several different WOB under constant atmospheric pressure and water flow. In looking at relationships of WOB, ROP and DOC, it is clear that increasing the WOB leads to a subsequent increase in DOC and ROP. Furthermore, increasing the WOB also leads to increases in cutting sizes as well as material anisotropy. At Memorial University in Newfoundland, Canada, the Drilling Technology Laboratory (DTL) has developed a passive vibration-assisted rotational drilling (p-VARD) tool which enhances drill rates of penetration (ROP) in lab tests. Previous lab experiments, including simulations, point to axial vibrations having significantly improved ROP. These experiments are carried out by applying the Discrete Element Method (DEM) simulation, using the DTL p-VARD configurations tool. To gauge the tool's cutting efficiency, a PFC2D (i.e., particle flow code in two dimensions) numerical model is utilized in simulating micro-crack generation/propagation for the drill procedure on synthetic rocks. The pVARD tool compares the downhole vibration with the rigid drill configuration of conventional rotary drilling, using low, medium and high spring compliance. Next, output parameters for ROP, MSE, and DOC are analyzed for pVARD/ non-pVARD configurations. The overall results point to the pVARD tool having a positive impact in downhole drilling, showing improvements in DOC, MSE, and ROP. III Acknowledgement I wish to extend my sincere thanks to the many people who have assisted me in my research endeavours. First of all, I would like to thank my family for their love and support, which encouraged me to continue with this work to the very end. As well, I wish to thank my graduate supervisor, Dr. Stephen Butt, for his support and encouragement as well as his deep insights into the thesis problem, which guided me to find appropriate solutions. In addition, I thank my friend, Abdel Salaam, for his assistance in programming the simulations, and I also thank the Drilling Technology Laboratory group members for their ongoing support.
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Papers by Abourawi Malid Alwaar