Mechanical jar, method and system

Patent metadata

Field	Value
Publication number	US-11846152-B2
Application number	US-202117412629-A
Country	US
Kind code	B2
Filing date	Aug 26, 2021
Priority date	Aug 26, 2021
Publication date	Dec 19, 2023
Grant date	Dec 19, 2023

Abstract

A mechanical jar including a housing, a piston disposed in the housing and responsive to applied fluid pressure to move in a first direction relative to the housing, a biasing arrangement disposed in the housing and configured to bias the piston in a second direction opposite the first direction, and a restraint configured to prevent movement of the piston in the second direction until a threshold force is applied to the restraint by the piston, whereafter the piston suddenly moves in the second direction.

First claim

What is claimed is:

1. A mechanical jar comprising:
a housing;
a piston disposed in the housing and responsive to applied fluid pressure to move in a first direction relative to the housing;
a biasing arrangement disposed in the housing and configured to bias the piston in a second direction opposite the first direction;
a restraint configured to prevent movement of the piston in the second direction until a threshold force is applied to the restraint by the piston, whereafter the piston suddenly moves in the second direction; and
further comprising a J-Slot incrementing feature preventing movement of the piston in the first direction until a plurality of pressure up events is received by the jar each pressure event causing movement of the incrementing feature.

2. The mechanical jar as claimed in claim 1 , wherein the piston includes a connection member connected to the incrementing feature.

3. The mechanical jar as claimed in claim 1 , wherein the biasing arrangement is a spring.

4. The mechanical jar as claimed in claim 1 , wherein the restraint is a shear member.

5. The mechanical jar as claimed in claim 1 , wherein the restraint is a rupture member.

6. The mechanical jar as claimed in claim 1 , wherein the restraint is a collet.

7. A method for jarring a component downhole comprising:
running a mechanical jar as claimed in claim 1 into proximity to a component to be jarred;
pressuring up on the jar;
applying biasing arrangement force through the piston to a restraint in the housing;
causing release of the restraint; and

suddenly releasing the biasing arrangement force.

8. The method as claimed in claim 7 further including cycling pressure up events to cycle an incrementing feature associated with the mechanical jar.

9. The method as claimed in claim 7 further including impacting a target using the suddenly released biasing arrangement force.

10. A wellbore system comprising:
a borehole in a subsurface formation;
a string disposed in the borehole;
a mechanical jar as claimed in claim 1 disposed within or as a part of the string.

Assignees

• Smith James
• Baker Hughes Oilfield Operations Llc

Inventors

• Smith James

Classifications

• E21B31/107 Primary

  using impact means for releasing stuck parts, e.g. jars · CPC title

• E21B23/006

  "J-slot" systems, i.e. lug and slot indexing mechanisms · CPC title

• E21B23/08

  Introducing or running tools by fluid pressure, e.g. through-the-flow-line tool systems · CPC title

• E21B31/113 Primary

  hydraulically-operated · CPC title