US 12,078,021 B2
Fishing jar
Adam Larsen, Houston, TX (US); and Ronald R. Miller, Houston, TX (US)
Assigned to INNOVEX DOWNHOLE SOLUTIONS, INC., Houston, TX (US)
Filed by INNOVEX DOWNHOLE SOLUTIONS, INC., Houston, TX (US)
Filed on Jan. 24, 2023, as Appl. No. 18/158,534.
Claims priority of provisional application 63/302,640, filed on Jan. 25, 2022.
Prior Publication US 2023/0235639 A1, Jul. 27, 2023
Int. Cl. E21B 31/113 (2006.01)
CPC E21B 31/1135 (2013.01) 19 Claims
OG exemplary drawing
 
1. A fishing jar, comprising:
an outer housing that is configured to connect to a work string;
a mandrel positioned at least partially within the outer housing and having a fish end configured to engage a fish, the mandrel and the outer housing defining an annulus therebetween;
an anvil coupled to or integral with the mandrel;
a hammer coupled to or integral with the outer housing; and
a triggering mechanism positioned in the annulus so as to partition the annulus into a first chamber and a second chamber, the first and second chambers separated axially apart and in fluid communication via the triggering mechanism, wherein the triggering mechanism is configured to:
permit hydraulic fluid to flow from the first chamber to the second chamber at a first rate in response to pressing the outer housing to move toward the fish end of the mandrel during a downstroke of the outer housing, until the outer housing reaches a trigger position relative to the mandrel; and
permit the hydraulic fluid to flow from the first chamber to the second chamber at a second rate that is greater than the first rate after the outer housing reaches the trigger position until the hammer impacts the anvil at an end of the downstroke.