US 12,110,451 B2
Methods and materials for controlled release of materials in a subterranean reservoir
Leah Marie Johnson, Durham, NC (US); Ginger Denison Rothrock, Cary, NC (US); Chasity Antoninette Norton, Roxboro, NC (US); Nicolas Daniel Huffman, Raleigh, NC (US); and Jeffrey Brent Mecham, Raleigh, NC (US)
Assigned to Research Triangle Institute, Research Triangle Park (NC)
Filed by Research Triangle Institute, Research Triangle Park, NC (US)
Filed on Jun. 23, 2021, as Appl. No. 17/355,828.
Application 16/547,201 is a division of application No. 15/634,340, filed on Jun. 27, 2017, granted, now 10,421,894, issued on Sep. 24, 2019.
Application 17/355,828 is a continuation of application No. 16/547,201, filed on Aug. 21, 2019, granted, now 11,078,404.
Claims priority of provisional application 62/354,909, filed on Jun. 27, 2016.
Prior Publication US 2021/0317360 A1, Oct. 14, 2021
This patent is subject to a terminal disclaimer.
Int. Cl. C09K 8/588 (2006.01); C09K 8/508 (2006.01); C09K 8/512 (2006.01); C09K 8/516 (2006.01); E21B 33/138 (2006.01); E21B 43/20 (2006.01)
CPC C09K 8/588 (2013.01) [C09K 8/508 (2013.01); C09K 8/512 (2013.01); C09K 8/516 (2013.01); E21B 33/138 (2013.01); E21B 43/20 (2013.01); C09K 2208/10 (2013.01)] 19 Claims
 
1. A controlled-release delivery particle comprising:
an outer shell defining an interior core, the outer shell being at least partially formed of a degradable polymer selected from the group consisting of polyureas, polyurethanes, and combinations thereof; and
one or more materials present in the interior core and releasable from the controlled-release delivery particle;
wherein the controlled-release delivery particle has an average size of about 50 nm to about 900 nm; and
wherein the controlled-release delivery particle is configured for delivery to a site of use exhibiting one or more conditions effective to cause the outer shell to degrade from the outside-in and release the one or more materials from the interior core, the one or more conditions effective to cause the outer shell to degrade comprising one or more of pH, temperature, pressure, salinity, shear, and oil content.