US 12,252,959 B1
Wiper dart having a bi-diameter wiper cup
Lonnie Carl Helms, Houston, TX (US); Connor Faulk, Houston, TX (US); Grant Andruss, Houston, TX (US); Payton Dally, Houston, TX (US); Arturo Lopez, Houston, TX (US); Brian Nguyen, Houston, TX (US); and Luke Smith, Houston, TX (US)
Assigned to Halliburton Energy Services, Inc., Houston, TX (US)
Filed by Halliburton Energy Services, Inc., Houston, TX (US)
Filed on Sep. 13, 2023, as Appl. No. 18/466,159.
Int. Cl. E21B 37/10 (2006.01)
CPC E21B 37/10 (2013.01) 20 Claims
OG exemplary drawing
 
1. A wiper dart comprising:
an inner mandrel; and
a wiper cup located circumferentially around the outside of the inner mandrel, wherein the wiper cup has a cup profile comprising a first outer diameter and a second outer diameter, wherein the first outer diameter is different from the second outer diameter, wherein the first outer diameter seals and wipes an inside of a tool joint, and the second outer diameter seals and wipes an inside of a pipe section, and wherein the cup profile has a curvature change between the second outer diameter and the first outer diameter.