| US 11,814,933 B2 | ||
| Actuation of downhole devices | ||
| Jothibasu Ramasamy, Dhahran (SA); Chinthaka Pasan Gooneratne, Dhahran (SA); and Jianhui Xu, Dhahran (SA) | ||
| Assigned to Saudi Arabian Oil Company, Dhahran (SA) | ||
| Filed by Saudi Arabian Oil Company, Dhahran (SA) | ||
| Filed on Dec. 1, 2021, as Appl. No. 17/539,565. | ||
| Prior Publication US 2023/0167716 A1, Jun. 1, 2023 | ||
| Int. Cl. E21B 41/00 (2006.01) | ||
| CPC E21B 41/0085 (2013.01) [E21B 2200/08 (2020.05)] | 31 Claims |
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1. A method for actuation of a downhole device, the method comprising:
rotating a drill pipe relative to a cylindrical pipe disposed coaxially within the drill pipe, in which the cylindrical pipe has an outer surface facing an inner surface of the drill pipe, and in which the drill pipe contains a downhole fluid,
in which one or more first segments comprising a first material are disposed on the inner surface of the drill pipe,
in which one or more second segments comprising a degradable material are disposed on the outer surface of the cylindrical pipe, in which each of the one or more second segments is aligned with a corresponding one of the one or more first segments, and
in which the first material and the degradable material are insoluble in the downhole fluid, and in which a solubility of the degradable material in a solvent is greater than a solubility of the first material in the solvent;
generating a first electrical signal pattern during rotation of the drill pipe; introducing the solvent into the drill pipe, in which the degradable material degrades responsive to introduction of the solvent; and generating a second electrical signal pattern during rotation of the drill pipe after introduction of the solvent. |