Method for evaluating the effectiveness of matrix acidizing in a subterranean formation
AssigneeKing Fahd University of Petroleum and Minerals
InventorsSalah El-Din Elkatatny, Mohamed Mahmoud
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Abstract
A method of evaluating the effectiveness of matrix acidizing treatment in a subterranean formation surrounding a wellbore that involves injecting a plurality of cationic salts into multiple sections of the subterranean formation before acidizing treatment, followed by collecting the cationic salts at the surface of the wellbore after producing the wellbore. A permeability recovery factor is calculated from a concentration ratio of the injected salt to the collected salt. The permeability recovery factor shows the effectiveness of the acidizing treatment. The permeability recovery factor also indicates the contribution of each individual section of the formation to the total production flow.
Claims20
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.
A method of evaluating the effectiveness of matrix acidizing in a subterranean formation in a plurality of sections of a well, comprising:
- dividing the well into the plurality of sections;
- injecting a first concentration of a first salt solution into a first section;
- injecting a first concentration of a second salt solution into a second section;
- matrix acidizing the subterranean formation by injecting a stimulation fluid into the subterranean formation surrounding the plurality of sections;
- producing the well to form a formation fluid;
- collecting a fluid mixture comprising the formation fluid, the stimulation fluid, a second concentration of the first salt solution, and a second concentration of the second salt solution at a surface of the well;
- and
- determining a permeability recovery in the first section by calculating a ratio of the second concentration of the first salt solution to the first concentration of the first salt solution, and a permeability recovery in the second section by calculating a ratio of the second concentration of the second salt solution to the first concentration of the second salt solution.
Dependencies are inferred from the claim text.