TY - GEN
T1 - Numerical and experimental investigation of a novel perforation technique in petroleum wells - Perforation by drilling
AU - Rahman, M. A.
AU - Biazar, J.
AU - Koksal, M.
AU - Islam, M. R.
PY - 2005
Y1 - 2005
N2 - The objective of perforating is to maximize well productivity by establishing good connectivity between the wellbore and formation. It is known that conventional method of perforation, using explosive charges, does not achieve expected well productivity due to a region of reduced permeability around the perforation tunnel. The results of an experimental and numerical program developed to investigate the impact of Perforating by Shooting (PS) in cylindrical sand samples with varying amounts of strength and porosity are presented in this paper. A new technique, Perforating by Drilling (PD) is proposed and the performance PD technique is compared with that of the PS technique. Furthermore, in order to gain an appreciation of a "perfect" perforation, results are compared with the Casting technique. Fluid flow rate and differential pressure across the perforated samples were measured for three different types of samples using "Geotechnical Digital System" triaxial testing set-up. Fluid flow rate with changing differential pressure and finally pressure build-up data with time profile indicates the PD technique can achieve maximum wellbore productivity compared to the PS technique. Results indicate that at 100 kPa differential pressure the PS, PD and Casting techniques can achieve 0.20 mL/s, 0.65 mL/s and 1.00 mL/s fluid flow rates respectively across a sample. A 1-D time dependent porous media flow model was implemented to simulate flow across the perforated cylindrical samples created by the PS, PD and Casting techniques. Good consistency is obtained between the experimental and numerical results.
AB - The objective of perforating is to maximize well productivity by establishing good connectivity between the wellbore and formation. It is known that conventional method of perforation, using explosive charges, does not achieve expected well productivity due to a region of reduced permeability around the perforation tunnel. The results of an experimental and numerical program developed to investigate the impact of Perforating by Shooting (PS) in cylindrical sand samples with varying amounts of strength and porosity are presented in this paper. A new technique, Perforating by Drilling (PD) is proposed and the performance PD technique is compared with that of the PS technique. Furthermore, in order to gain an appreciation of a "perfect" perforation, results are compared with the Casting technique. Fluid flow rate and differential pressure across the perforated samples were measured for three different types of samples using "Geotechnical Digital System" triaxial testing set-up. Fluid flow rate with changing differential pressure and finally pressure build-up data with time profile indicates the PD technique can achieve maximum wellbore productivity compared to the PS technique. Results indicate that at 100 kPa differential pressure the PS, PD and Casting techniques can achieve 0.20 mL/s, 0.65 mL/s and 1.00 mL/s fluid flow rates respectively across a sample. A 1-D time dependent porous media flow model was implemented to simulate flow across the perforated cylindrical samples created by the PS, PD and Casting techniques. Good consistency is obtained between the experimental and numerical results.
UR - http://www.scopus.com/inward/record.url?scp=33748972439&partnerID=8YFLogxK
M3 - Conference contribution
AN - SCOPUS:33748972439
SN - 1894662091
SN - 9781894662093
T3 - Proceedings, Annual Conference - Canadian Society for Civil Engineering
SP - GC-228-1-GC-228-9
BT - Proceedings - 33rd CSCE Annual Conference 2005
T2 - 33rd CSCE Annual Conference 2005
Y2 - 2 June 2005 through 4 June 2005
ER -