Use of elastomers to produce gels for treating a wellbore
AssigneeM-1 Drilling Fluids U.K. Limited
InventorDonna Gerrard
Life of this patent
Estimating the term…
Abstract
A method of treating an earthen formation that includes introducing a first amount of a first blocked isocyanate in a liquid phase into the earthen formation; introducing a second amount of a second blocked isocyanate in a liquid phase into the earthen formation; the second blocked isocyanate group having a lower unblocking temperature than the first blocked isocyanate group; introducing at least one active hydrogen compound into the earthen formation; and contacting the first and second blocked isocyanates and the active hydrogen compound to form an elastomeric gel. The combination of two blocked isocyanates provides a synergistic effect so that the curing time can be optimised in a manner unexpected from the properties of the individual blocked isocyanates.
Claims20
A method of treating an earthen formation, comprising:
- introducing a first amount of a first blocked isocyanate in a liquid phase into the earthen formation;
- introducing a second amount of a second blocked isocyanate in a liquid phase into the earthen formation;
- wherein the ratio of the volumes of the first blocked isocyanate to the second blocked isocyanate is within the range of 4:1 to 1:4;
- wherein the second blocked isocyanate has a lower unblocking temperature than the first blocked isocyanate;
- introducing at least one active hydrogen compound into the earthen formation;
- and
- contacting the first and second blocked isocyanates and the active hydrogen compound to form an elastomeric gel, wherein the ratio of the first amount of the first blocked isocyanate to the second amount of the second blocked isocyanate is selected such that the second amount of the second blocked isocyanate added decreases the curing time of the formed elastomeric gel.
A method of treating an earthen formation, comprising:
- introducing a first amount of a first blocked isocyanate in a liquid phase into the earthen formation;
- introducing a second amount of a second blocked isocyanate in a liquid phase into the earthen formation;
- wherein the second blocked isocyanate has at least a 10° C. lower unblocking temperature than the first blocked isocyanate;
- introducing at least one active hydrogen compound into the earthen formation;
- and
- contacting the first and second blocked isocyanates and the active hydrogen compound to form an elastomeric gel, wherein the ratio of the first amount of the first blocked isocyanate to the second amount of the second blocked isocyanate is selected such that the second amount of the second blocked isocyanate added decreases the curing time of the formed elastomeric gel.
Dependencies are inferred from the claim text.