US 9,810,063 B2
Method for evaluating the effectiveness of matrix acidizing in a subterranean formation
Salah El-Din Elkatatny, Dhahran (SA); and Mohamed Mahmoud, Dhahran (SA)
Assigned to King Fahd University of Petroleum and Minerals, Dhahran (SA)
Filed by KING FAHD UNIVERSITY OF PETROLEUM AND MINERALS, Dhahran (SA)
Filed on Mar. 16, 2016, as Appl. No. 15/71,538.
Claims priority of provisional application 62/254,567, filed on Nov. 12, 2015.
Prior Publication US 2017/0138190 A1, May 18, 2017
Int. Cl. E21B 49/08 (2006.01); E21B 43/25 (2006.01); E21B 43/26 (2006.01); E21B 41/00 (2006.01)
CPC E21B 49/086 (2013.01) [E21B 43/25 (2013.01); E21B 43/26 (2013.01); E21B 41/0035 (2013.01); E21B 2049/085 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method of evaluating the effectiveness of matrix acidizing in a subterranean formation surrounding a well, comprising:
injecting a first concentration of at least one salt solution into the subterranean formation;
matrix acidizing the subterranean formation by injecting a stimulation fluid;
producing the well to form a formation fluid;
collecting a fluid mixture comprising the formation fluid, the stimulation fluid, and a second concentration of at least one salt solution at a surface of the well; and
determining a permeability recovery by calculating a ratio of the second concentration of at least one salt solution to the first concentration of at least one salt solution.