Hydrolytically degradable composition
AssigneeCdi Energy Products, Inc.
InventorsXuan Fu, Frederick Bligh Pippert
Life of this patent
Estimating the term…
Abstract
Disclosed are time controlled, hydrolytically degradable compositions that include a polyurethane; precipitated silica, carbon black, or a combination thereof; an organic acid adapted to facilitate degradation when the composition is contacted with water; a stabilizer; a first crosslinking agent; and an optional co-agent. The composition is adapted to degrade over a predetermined time period upon contact with water at a pH ranging from 5 to 8 and at a temperature ranging from 100° F. to 250° F.
Claims19
A time controlled, hydrolytically degradable composition comprising:
- (a) a polyurethane;
- (b) a precipitated silica dispersed throughout the composition that is adapted to promote degradation of the composition when the composition is contacted with water and/or an aqueous environment, carbon black, or a combination thereof;
- (c) an organic acid adapted to promote degradation of the composition when the composition is contacted with water and/or an aqueous environment;
- (d) a stabilizer that stabilizes the composition before contact with water and/or an aqueous environment;
- (e) a crosslinking agent that forms crosslinks throughout the polyurethane to provide hardness, rigidity, strength, and/or elasticity to the composition;
- and
- (f) an optional co-agent, that when present, is adapted to aid in crosslink formation and further improve hardness, rigidity, and/or elasticity of the composition, wherein:
- the composition is adapted to degrade upon contact with water at a pH ranging from 5 to 8 and at a temperature ranging from 100° F. to 250° F.
A hydrolytically degradable frack plug seal adapted for downhole use in a wellbore, the frack plug seal comprised of:
- (a) a millable polyurethane;
- (b) precipitated silica, carbon black, or a combination thereof dispersed throughout the frack plug seal that is adapted to promote frack plug seal degradation when the frack plug seal is contacted with water and/or an aqueous environment;
- (c) an organic acid adapted to promote degradation of the frack plug seal when the frack plug seal is contacted with water and/or an aqueous environment;
- (d) a stabilizer that stabilizes the composition before contact with water and/or an aqueous environment;
- and
- (e) a crosslinking agent adapted that forms crosslinks throughout the millable polyurethane to provide hardness, rigidity, strength, and/or elasticity to the composition;
- wherein
- the frack plug seal is configured to degrade in a time controlled upon contact with water and/or an aqueous environment at a temperature. ranging from 100° F. to 250° F.
Dependencies are inferred from the claim text.