| CPC E21B 47/095 (2020.05) [E21B 23/04 (2013.01); E21B 33/165 (2020.05)] | 20 Claims |
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1. A method of tracking the location of a wiper dart in a wellbore comprising:
introducing the wiper dart into a pipe string disposed within the wellbore, the pipe string comprising two or more drill pipe sections connected together via one or more tool joints, wherein the wiper dart comprises:
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 an angle is formed with a vertex located on an inside of the wiper cup at the inner mandrel, a first arm of the angle extending from the vertex parallel to and along the outside of the inner mandrel, and a second arm of the angle extending from the vertex to an edge of the wiper cup, and wherein the cup profile has a curvature change between the first outer diameter and the second outer diameter along the second arm of the angle prior to introduction of the wiper dart into the pipe string;
wherein the first outer diameter seals and wipes an inside of the one or more tool joints, and the second outer diameter-seals and wipes an inside of the two or more drill pipe sections,
observing detectable pressure spikes as the wiper cup traverses from each drill pipe section into each tool joint; and
monitoring the detectable pressure spikes to track the location of the wiper dart.
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