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Title: Thermodynamic and kinetic aspects of argillaceous sandstone acidizing

Abstract

The thermodynamic aspect of sandstone acidizing by hydrofluoric acid is examined. It is shown that silica dissolution, with a first order in HF concentration leads nearly exclusively to the formation of fluosilicic acid. Clay and feldspar dissolution is much more complex, and after a uniform alteration of the crystalline lattice, partial precipitation of solicic species occurs when the acid is spent. An approach to the kinetic aspect is made by defining, for a naturally complex medium, not a single reaction rate constant, but a reactivity profile that is a characteristic of the medium. Experimental data obtained enable a correlation to be determined between permeability, porosity, and reactivity. In addition, a qualitative interpretation of acid response curves is given. The numerical simulation of the acidizing process reproduces the experimental results in a satisfactory way. When extended to radial flow, the model brings out the influence of stimulation parameters, injection rate, concentration, and time. (12 refs.)

Authors:
Publication Date:
Research Org.:
Inst Francais du Petrole
OSTI Identifier:
6641817
Report Number(s):
CONF-7410175-
Journal ID: CODEN: SEAPA
Resource Type:
Conference
Journal Name:
Soc. Pet. Eng. AIME, Pap.; (United States)
Additional Journal Information:
Journal Volume: SPE-5156; Conference: 49. meeting and exhibition of the Society of Petroleum Engineers of AIME, Houston, TX, USA, 6 Oct 1974
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES; ACIDIZATION; THERMODYNAMICS; SANDSTONES; DISSOLUTION; CHEMICAL REACTION KINETICS; CHEMICAL REACTIONS; HYDROFLUORIC ACID; MATHEMATICAL MODELS; HYDROGEN COMPOUNDS; INORGANIC ACIDS; KINETICS; REACTION KINETICS; ROCKS; SEDIMENTARY ROCKS; 580300* - Mineralogy, Petrology, & Rock Mechanics- (-1989)

Citation Formats

Labrid, J C. Thermodynamic and kinetic aspects of argillaceous sandstone acidizing. United States: N. p., 1974. Web.
Labrid, J C. Thermodynamic and kinetic aspects of argillaceous sandstone acidizing. United States.
Labrid, J C. Tue . "Thermodynamic and kinetic aspects of argillaceous sandstone acidizing". United States.
@article{osti_6641817,
title = {Thermodynamic and kinetic aspects of argillaceous sandstone acidizing},
author = {Labrid, J C},
abstractNote = {The thermodynamic aspect of sandstone acidizing by hydrofluoric acid is examined. It is shown that silica dissolution, with a first order in HF concentration leads nearly exclusively to the formation of fluosilicic acid. Clay and feldspar dissolution is much more complex, and after a uniform alteration of the crystalline lattice, partial precipitation of solicic species occurs when the acid is spent. An approach to the kinetic aspect is made by defining, for a naturally complex medium, not a single reaction rate constant, but a reactivity profile that is a characteristic of the medium. Experimental data obtained enable a correlation to be determined between permeability, porosity, and reactivity. In addition, a qualitative interpretation of acid response curves is given. The numerical simulation of the acidizing process reproduces the experimental results in a satisfactory way. When extended to radial flow, the model brings out the influence of stimulation parameters, injection rate, concentration, and time. (12 refs.)},
doi = {},
journal = {Soc. Pet. Eng. AIME, Pap.; (United States)},
number = ,
volume = SPE-5156,
place = {United States},
year = {1974},
month = {1}
}

Conference:
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