US 12,000,227 B1
Untethered near-wellbore stimulation
Ahmed Y. Bukhamseen, Dammam (SA); Saad AlMutairi, Dammam (SA); and Fahd Ibrahim AlGhunaimi, Khobar (SA)
Assigned to SAUDI ARABIAN OIL COMPANY, Dhahran (SA)
Filed by Saudi Arabian Oil Company, Dhahran (SA)
Filed on Jan. 3, 2023, as Appl. No. 18/092,831.
Int. Cl. E21B 37/00 (2006.01); E21B 31/00 (2006.01); E21B 43/26 (2006.01)
CPC E21B 31/005 (2013.01) [E21B 43/26 (2013.01)] 22 Claims
OG exemplary drawing
 
1. An untethered stimulation tool for dislodging material from a perforation formed through a tubular disposed in a wellbore, the untethered stimulation tool comprising:
a main body, wherein the main body is formed at least in part from a material that is buoyant in a wellbore fluid;
a ballast;
a magnet; and
a pressure pulse generator, wherein the untethered stimulation tool is configured to:
by a force of gravity when the ballast is attached to the untethered stimulation tool, descend from a wellhead downhole within the tubular;
couple, by the magnet, to an interior surface of the tubular upon arrival of the untethered stimulation tool at a downhole location proximate the perforation;
when the untethered stimulation tool is coupled by the magnet to the interior of the tubular, transmit pressure pulses from the pressure pulse generator into the perforation, thereby dislodging material from the perforation; and
de-couple from the interior surface and release the ballast, thereby permitting the untethered stimulation tool to ascend uphole, driven at least partially by a buoyant force exerted by the wellbore fluids.