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Relation between structure and properties of modified starches. Application to the formulation of non-polluting drilling fluids; Relation structure/proprietes d'amidons modifies. Application a la formulation de fluides de forage non polluants

Abstract

Starch is a polymeric carbohydrate derivative with anhydro-glucose units and is extracted from the tissues of certain plants. In its native form, starch granule is non soluble in cold water and therefore most applications need a cooking period in the presence of an excess of water. The cooking treatment is therefore associated with large changes in viscosity. Overall, starch suspensions properties are strongly influenced by starch botanical origins, shearing and heating conditions under which they are prepared. Their properties can be modulated though chemical modifications depending on their uses in the petroleum industry. This study focuses on the relations between structure and physico-chemical, rheological and filtration properties of modified starches. These starches are originated from native potato, i. e. hydroxy-propyl and/or crosslinked starches above or below the gelatinization temperature. The samples were characterised in terms of swelling capacity, average granule size distribution and molecular weight. Microscopic methods were used to investigate starch structure. Relations were established between the rheological properties and the physico-chemical parameters. These properties are governed by the deformability and rigidity parameters as a function of the concentration. The best samples were then chosen and were submitted to the high temperature (140 deg. C - 160 deg. C),  More>>
Authors:
Publication Date:
Dec 06, 1999
Product Type:
Thesis/Dissertation
Report Number:
IFP-52956
Reference Number:
EDB-00:094837
Resource Relation:
Other Information: TH: These polymeres fonctionnels - elaboration et proprietes; PBD: 6 Dec 1999
Subject:
02 PETROLEUM; DRILLING FLUIDS; RHEOLOGY; FILTRATION; TEMPERATURE DEPENDENCE; STARCH; MOLECULAR STRUCTURE; CHEMICAL COMPOSITION; MORPHOLOGY; SORPTION; SUSPENSIONS; CONCENTRATION RATIO; GRAIN SIZE; SWELLING; VISCOSITY; CROSS-LINKING; AGING; CHEMICAL REACTION KINETICS; PH VALUE; SHEAR; SALINITY; ADSORPTION; OPTICAL MICROSCOPY; POROSITY; SCANNING ELECTRON MICROSCOPY; TRANSMISSION ELECTRON MICROSCOPY; SOLUBILITY; TEXTURE
OSTI ID:
20052899
Research Organizations:
Institut Francais du Petrole (IFP), 92 - Rueil-Malmaison (France); Rouen Univ., 76 - Mont-Saint-Aignan (France)
Country of Origin:
France
Language:
French
Other Identifying Numbers:
TRN: FR0003625
Availability:
Available to ETDE participating countries only(see www.etde.org); commercial reproduction prohibited; OSTI as DE20052899
Submitting Site:
FR
Size:
213 pages
Announcement Date:

Citation Formats

Dubois, I. Relation between structure and properties of modified starches. Application to the formulation of non-polluting drilling fluids; Relation structure/proprietes d'amidons modifies. Application a la formulation de fluides de forage non polluants. France: N. p., 1999. Web.
Dubois, I. Relation between structure and properties of modified starches. Application to the formulation of non-polluting drilling fluids; Relation structure/proprietes d'amidons modifies. Application a la formulation de fluides de forage non polluants. France.
Dubois, I. 1999. "Relation between structure and properties of modified starches. Application to the formulation of non-polluting drilling fluids; Relation structure/proprietes d'amidons modifies. Application a la formulation de fluides de forage non polluants." France.
@misc{etde_20052899,
title = {Relation between structure and properties of modified starches. Application to the formulation of non-polluting drilling fluids; Relation structure/proprietes d'amidons modifies. Application a la formulation de fluides de forage non polluants}
author = {Dubois, I}
abstractNote = {Starch is a polymeric carbohydrate derivative with anhydro-glucose units and is extracted from the tissues of certain plants. In its native form, starch granule is non soluble in cold water and therefore most applications need a cooking period in the presence of an excess of water. The cooking treatment is therefore associated with large changes in viscosity. Overall, starch suspensions properties are strongly influenced by starch botanical origins, shearing and heating conditions under which they are prepared. Their properties can be modulated though chemical modifications depending on their uses in the petroleum industry. This study focuses on the relations between structure and physico-chemical, rheological and filtration properties of modified starches. These starches are originated from native potato, i. e. hydroxy-propyl and/or crosslinked starches above or below the gelatinization temperature. The samples were characterised in terms of swelling capacity, average granule size distribution and molecular weight. Microscopic methods were used to investigate starch structure. Relations were established between the rheological properties and the physico-chemical parameters. These properties are governed by the deformability and rigidity parameters as a function of the concentration. The best samples were then chosen and were submitted to the high temperature (140 deg. C - 160 deg. C), high shearing (16000 tr/ mn) and salinity (CaCl{sub 2}, 1M). The physico-chemical and rheological studies showed that the starch system which is crosslinked below the gelatinization temperature is more resistant that the samples crosslinked above the gelatinization temperature. Then, a drilling fluid formulation was investigated. The filtration results evidenced an increase of the cake permeability in the presence of starch particles but the good stability of these samples permits their uses for high temperature. Thus, non crosslinked / crosslinked starch mixtures were investigated and good filtration properties were obtained between 25 deg. C and 140 deg. C. The sample obtained as a function of time filtrate were analysed by size exclusion chromatography in order to estimate the formation damage. (author)}
place = {France}
year = {1999}
month = {Dec}
}