Expandable polymer grout for sand control in a well

A method for sealing a sand screen in a wellbore, the method comprising:

• identifying a failure point in the sand screen, wherein the sand screen is surrounded by an annular pack;
• combining, with a deployment system at a surface of the wellbore, components of an expandable polymer grout system to form a grout, wherein the components of the expandable polymer grout system comprise an isocyanate component, an organic polyol component, and a blowing agent;
• providing the grout to the failure point in the sand screen;
• and
• allowing the grout to cure thereby forming a polymer seal at the failure point in the sand screen, wherein the polymer seal extends into and seals at least a portion of the annular pack adjacent to the failure point, and wherein the polymer seal leaves unsealed at least a portion of the sand screen to permit continued fluid flow at the portion of the sand screen that is unsealed.

A method for sealing a sand screen in a wellbore, the method comprising:

• identifying a potential failure point in the sand screen, wherein the sand screen is surrounded by an annular pack;
• combining, with a deployment system, components of an expandable polymer grout system to form a grout, wherein the components of the expandable polymer grout system comprise an isocyanate component, an organic polyol component, and a blowing agent;
• delivering the grout to the potential failure point in the sand screen;
• and
• allowing the grout to cure thereby forming a polymer seal at the potential failure point in the sand screen, wherein the polymer seal extends into and seals at least a portion of the annular pack adjacent to the failure point, and wherein the polymer seal leaves unsealed at least a portion of the sand screen to permit continued fluid flow at the portion of the sand screen that is unsealed.