COMPOSITIONS AND METHODS FOR COMPLETING SUBTERRANEAN WELLS

Hydroxyethylcellulose (HEG) may be used to provide fluid-loss control in well- cement slurries HECs that have a molecular weight above 600,000, a degree of substitution higher than 1.9 and a molar substitution above 2.0 are particularly useful in that they not only provide fluid-loss control, but al...

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Bibliographische Detailangaben
Hauptverfasser:	Isabelle COUILLET, Hafida ACHTAL, Cyril TERRIER
Format:	Patent
Sprache:	eng ; spa
Schlagworte:	ADHESIVES ARTIFICIAL STONE CEMENTS CERAMICS CHEMISTRY COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDINGMATERIALS CONCRETE DYES LIME, MAGNESIA MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FORELSEWHERE METALLURGY MISCELLANEOUS APPLICATIONS OF MATERIALS MISCELLANEOUS COMPOSITIONS NATURAL RESINS PAINTS POLISHES REFRACTORIES SLAG TREATMENT OF NATURAL STONE
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Beschreibung
Zusammenfassung:	Hydroxyethylcellulose (HEG) may be used to provide fluid-loss control in well- cement slurries HECs that have a molecular weight above 600,000, a degree of substitution higher than 1.9 and a molar substitution above 2.0 are particularly useful in that they not only provide fluid-loss control, but also may be used as a cement extender. Furthermore, the retardation effect may be reduced. Se puede utilizar hidroxietilcelulosa (HEC) para proporcionar control de pérdida de fluido en suspensiones para cementar pozos. Resultan particularmente útiles las HEC con un peso molecular superior a 600.000, un grado de sustitución mayor a 1,9 y una sustitución molar por encima de 2,0, ya que no brindan solamente control en la pérdida de fluido, sino que también se pueden utilizar como extensores de cemento. Asimismo, se puede reducir el efecto de retraso.