US 12,084,941 B2
Device comprising a dissolvable material for use in a wellbore
Geirmund Sætre, Hafrsfjord (NO); and Michael K. Williamson, Stavanger (NO)
Assigned to Marwell AS, Stavanger (NO)
Appl. No. 17/775,483
Filed by Marwell AS, Stavanger (NO)
PCT Filed Nov. 4, 2020, PCT No. PCT/NO2020/050269
§ 371(c)(1), (2) Date May 9, 2022,
PCT Pub. No. WO2021/096364, PCT Pub. Date May 20, 2021.
Claims priority of application No. 20191355 (NO), filed on Nov. 15, 2019.
Prior Publication US 2022/0372834 A1, Nov. 24, 2022
Int. Cl. E21B 33/12 (2006.01)
CPC E21B 33/1208 (2013.01) [E21B 2200/08 (2020.05)] 14 Claims
OG exemplary drawing
 
1. A device for temporarily blocking fluid flow through an opening in a radial surface of a tubing in a wellbore, the tubing having an inside and an outside, and the opening having a circumferential wall, the device having a first side and a second side, wherein, when the device is inserted in the opening, the first side faces the inside of the tubing and the second side faces the outside of the tubing, the device comprising:
-a plug made of a dissolvable material configured to dissolve over a limited time period,
an electrically insulating material located between the plug and the circumferential wall of the opening in the radial surface of the tubing to prevent electrical connection between the dissolvable material of the plug and a material having a higher electrode potential than the dissolvable material, and
-a further electrically insulating material located on the first side of the device and configured to increase a distance between the dissolvable material and the material having a higher electrode potential than the dissolvable material that is measured through the fluid on the inside of the tubing;
wherein the device is configured such that when the device is initially inserted in the opening of the tubing, the dissolvable material is exposed to a fluid on the inside of the tubing and on the outside of the tubing.