US 12,252,645 B2
Formulation and setup method of in-situ dissolvable plug
Lei Zhao, Houston, TX (US); Jiaxiang (Jason) Ren, Houston, TX (US); Jianpeng Yue, Houston, TX (US); and Peng Cheng, Houston, TX (US)
Assigned to CNPC USA CORPORATION, Houston, TX (US); BEIJING HUAMEI, INC., Beijing (CN); and CHINA NATIONAL PETROLEUM CORPORATION, Beijing (CN)
Filed by CNPC USA CORP., Houston, TX (US); BEIJING HUAMEI, INC., Beijing (CN); and CHINA NATIONAL PETROLEUM CORPORATION, Beijing (CN)
Filed on Jul. 26, 2023, as Appl. No. 18/359,432.
Prior Publication US 2025/0043169 A1, Feb. 6, 2025
Int. Cl. E21B 33/13 (2006.01); C09K 8/42 (2006.01); C09K 8/44 (2006.01)
CPC C09K 8/426 (2013.01) [C09K 8/44 (2013.01); E21B 33/13 (2013.01); E21B 2200/08 (2020.05)] 4 Claims
OG exemplary drawing
 
1. An in-situ dissolvable plug useable for isolating sections of a wellbore, comprising:
a cylindrical body having a backup piece at least at one end of the cylindrical body; and
a tube extends through the cylindrical body and backup piece;
wherein the cylindrical body is made of dissolvable curable material, wherein the cylindrical body comprises an external surface, and an inner bore surface formed around the tube, wherein the cylindrical body is soft, moldable, and expandable in a direction from a starting point of the inner bore surface to the external surface that is perpendicular to the tube outer surface and in a direction away from the tube, wherein the backup piece is movable toward to the cylindrical body to squeeze the dissolvable curable material to expand and cure in-situ from the inner bore surface to the external surface to manufacture the plug in-situ in the downhole condition, wherein the dissolvable material comprises polymer material, wherein the polymer materials comprise a reaction product of an epoxy resin mixture, a cross-linker, a degradation catalyst, and viscosity enhancer, wherein the degradation catalyst is a controlled release catalyst and capped by a shell.