TY - CONF
T1 - An experimental investigation analyzing effects of injection pressure on efficiency of matrix acidizing stimulation on marcellus shale core samples
AU - Khalil, R. E.
AU - Emadi, H.
AU - Gamadi, T.
N1 - Funding Information:
The authors would like to thank Elena Melchert (Director of the Upstream Oil & Gas Research Division of the U.S. Department of Energy), Dr. Dustin Crandall (a Research Engineer at the National Energy Technology Laboratory), and Robert Vagnetti of the National Energy Technology Laboratory for providing the core samples.
Publisher Copyright:
© 2020 ARMA, American Rock Mechanics Association
PY - 2020
Y1 - 2020
N2 - Matrix acidizing is applied to oil and gas reservoirs to remove or bypass near-wellbore damage resulting in an increase in the formation permeability yielding higher production rates. Effects of matrix acidizing injection pressure on the rock properties including porosity, permeability, solubility, and acid penetration rate were investigated in this research. The results of the X-ray diffraction (XRD) and the solubility tests were used to select the optimum acid type and concentration, 15% hydrochloric acid (HCl). Three core samples contained continuous carbonate layers, from Marcellus shale gas formation, were used in this research. Matrix acidizing treatments were conducted at the reservoir temperature (66°C) and three injection pressures (1.72, 3.45, and 5.17 MPa). The results of the aforementioned rock properties were used to evaluate the efficacy of the acid treatments and determine the optimum acid injection pressure. The results demonstrated that performing matrix acid stimulation resulted in creating highly permeable channels (wormholes) with a permeability of 2.3 Darcy inside the core samples. Moreover, the results demonstrated that the increase in the acid injection pressure increased the porosity and permeability of the samples. However, increasing the injection pressure above 3.45 MPa resulted in insignificant enhancements in the properties.
AB - Matrix acidizing is applied to oil and gas reservoirs to remove or bypass near-wellbore damage resulting in an increase in the formation permeability yielding higher production rates. Effects of matrix acidizing injection pressure on the rock properties including porosity, permeability, solubility, and acid penetration rate were investigated in this research. The results of the X-ray diffraction (XRD) and the solubility tests were used to select the optimum acid type and concentration, 15% hydrochloric acid (HCl). Three core samples contained continuous carbonate layers, from Marcellus shale gas formation, were used in this research. Matrix acidizing treatments were conducted at the reservoir temperature (66°C) and three injection pressures (1.72, 3.45, and 5.17 MPa). The results of the aforementioned rock properties were used to evaluate the efficacy of the acid treatments and determine the optimum acid injection pressure. The results demonstrated that performing matrix acid stimulation resulted in creating highly permeable channels (wormholes) with a permeability of 2.3 Darcy inside the core samples. Moreover, the results demonstrated that the increase in the acid injection pressure increased the porosity and permeability of the samples. However, increasing the injection pressure above 3.45 MPa resulted in insignificant enhancements in the properties.
UR - http://www.scopus.com/inward/record.url?scp=85097955130&partnerID=8YFLogxK
M3 - Paper
AN - SCOPUS:85097955130
Y2 - 28 June 2020 through 1 July 2020
ER -