US 12,252,947 B2
Adjustable hydraulic jarring device
Robert W. Evans, Montgomery, TX (US)
Filed by Robert W. Evans, Montgomery, TX (US)
Filed on Jul. 18, 2023, as Appl. No. 18/223,259.
Application 18/223,259 is a continuation of application No. 17/462,251, filed on Aug. 31, 2021, granted, now 11,702,898.
Application 17/462,251 is a continuation of application No. 16/194,650, filed on Nov. 19, 2018, granted, now 11,105,170, issued on Aug. 31, 2021.
Application 16/194,650 is a continuation of application No. 15/054,394, filed on Feb. 26, 2016, granted, now 10,151,165, issued on Dec. 11, 2018.
Prior Publication US 2023/0358112 A1, Nov. 9, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. E21B 31/113 (2006.01); E21B 34/08 (2006.01)
CPC E21B 31/113 (2013.01) [E21B 34/08 (2013.01)] 4 Claims
OG exemplary drawing
 
1. A method of employing a jarring device in a well comprising:
a) applying an upward force from the surface on a jarring device disposed in a well, the jarring device comprising:
a housing;
an axially movable mandrel positioned within the housing;
a dog clutch surrounding the mandrel, the dog clutch comprising a plurality of segmented release lugs having more than one mating projection which are non-uniformly spaced apart from each other;
a trigger sleeve surrounding the dog clutch;
the dog clutch and trigger sleeve having complementary surfaces which when in alignment will cause the dog clutch to release the mandrel;
a spring positioned within the housing; and
a hydraulic chamber and a piston located in the hydraulic chamber and surrounding the mandrel and, the piston being positioned between the spring and dog clutch;
b) moving the mandrel axially within the housing in an upward direction;
c) holding the mandrel with the dog clutch;
d) resisting the movement of the mandrel by a force of the spring and a hydraulic pressure generated by the piston compressing a fluid in the hydraulic chamber;
e) releasing the mandrel with the dog clutch when the complementary surfaces of the dog clutch and trigger sleeve come into alignment; and
f) striking an anvil on the housing with a hammer surface of the mandrel.