Formulation and setup method of in-situ dissolvable plug
AssigneesCNPC USA Corporation, Beijing Huamei, Inc., China National Petroleum Corporation
InventorsLei ZHAO, Jiaxiang (Jason) REN, Jianpeng YUE, Peng CHENG
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Abstract
The patent application discloses a plug useable for isolating sections of a wellbore. The in-situ dissolvable plug comprises a cylindrical body having a backup piece at least at one end of the cylindrical body, a tube and a cylindrical body. The tube may extend through the cylindrical body and backup piece. The cylindrical body may be made of dissolvable material comprising an external surface, and an inner bore surface formed around the tube. The cylindrical body is soft, moldable, and expandable vertical to the tube to form an in-situ plug at downhole.
Claims20
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 comprising 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.
An in-situ manufactured plug for isolating zones in a well comprising:
- a distal end backup piece;
- a proximate end backup piece;
- and
- a cylindrical body between the distal end backup piece and the proximate end backup piece, wherein the cylindrical body is made of dissolvable material comprising an external surface, wherein the distal end backup piece and the proximate end backup piece are expandable vertically and move horizontally so as to squeeze the dissolvable material to expand vertically to form an in-situ plug.
A method of forming an in-situ plug, comprising:
- admixing an epoxy, a degradation catalyst, and a cross-linker to form a curable composition;
- mixing with fibers to make raw materials;
- and
- B staging the raw materials at low temperature to achieve high viscosity;
- deforming under a compressive load to form a shape of deformed casing;
- and
- starting another cross-linking reaction to form a fiber enhanced thermoset composite plug in-situ.
Dependencies are inferred from the claim text.