DEGRADABLE POLYMER COMPOSITION AND METHODS OF MANUFACTURING AND USING IN DOWNHOLE TOOLS

A chemical composition for a degradable polymeric material includes an isocyanate terminated prepolymer, including prepolymer units as a main chain with a plurality of isocynanates at ends of the main chain, a catalyst additive, and a cross-linking agent. The isocyanate terminated prepolymer can be...

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Bibliographische Detailangaben
Hauptverfasser:	REN, Jiaxiang, CHENG, Peng
Format:	Patent
Sprache:	eng
Schlagworte:	CHEMISTRY COMPOSITIONS BASED THEREON EARTH DRILLING EARTH DRILLING, e.g. DEEP DRILLING FIXED CONSTRUCTIONS MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS METALLURGY MINING OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR ASLURRY OF MINERALS FROM WELLS ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-UP
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Beschreibung
Zusammenfassung:	A chemical composition for a degradable polymeric material includes an isocyanate terminated prepolymer, including prepolymer units as a main chain with a plurality of isocynanates at ends of the main chain, a catalyst additive, and a cross-linking agent. The isocyanate terminated prepolymer can be an isocyanate terminated polyester, polycarbonate or polyether prepolymer. The isocyanate terminated prepolymer has a structural formula as follows:ONC-R″-NH-[-CO-R-CO-O-R′-O-]n-NH-R″-CNOwherein R, R′ and R″ are an aryl group or alkyl group and wherein n is a number of prepolymer units corresponding to length of the main chain. The composition degrades at a rate and at a delay for failure between 8-72 hours. The composition is a dissolvable rubber material with a modulus and elongation suitable for a component of a downhole tool.