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.
Claims18
A time controlled, hydrolytically degradable composition comprising:
- (a) a polyurethane;
- (b) a precipitated silica homogeneously 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, the precipitated silica having a surface area ranging from 120 to 150 m2/g;
- (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 frac plug seal adapted for downhole use in a wellbore, the frac plug seal comprised of:
- (a) a millable polyurethane;
- (b) precipitated silica or a combination of precipitated silica and carbon black homogeneously 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, the precipitated silica having a surface area ranging from 120 to 150 m2/g;
- (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.