US 5,174,393 AGranted

Hydraulic jar

AssigneeHouston Engineers, Inc.

InventorsBilly J. Roberts, Elmer J. Volmert, Arthur W. Meeks

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Abstract

There are disclosed alternate embodiments of a double acting hydraulic jar having a single detent chamber having a restriction on the inner diameter of its outer tubular member through which detent means carried about the outer diameter of the inner tubular member may be moved in order to impart either an up or down jar.

Claims11

Dependent claims

A hydraulic jar for use in applying up and down jars to an object stuck in a well bore, comprising

first and second telescopically arranged, tubular members connectible, respectively, to the stuck object and a pipe string adapted to be raised and lowered within the well bore, and being circumferentially spaced apart and sealed with respect to one another along equal diameter portions to form an annular space therebetween,
the outer member having a port therein to connect one end of the space with the well bore,
a piston ring sealably slidable within the space to separate the port from a chamber within the space which contains hydraulic fluid,
one of the tubular members having a cylindrical restriction within the chamber and the other tubular member having longitudinal grooves formed within a reduced diameter portion about its circumference intermediate longitudinally spaced upper and lower shoulders, and
detent ring means carried by the other member within the reduced diameter portion with one side closely surrounding the grooves and vertically reciprocable with respect to said other member between a first position in which its lower end is seated on the lower shoulder of the other member to prevent flow therepast, as a lower annular portion of its other side is pulled upwardly through the restriction, and a second position in which its upper end is seated on the upper shoulder of said other member to prevent flow therepast, as an upper annular portion of its other side is pushed downwardly through the restriction,
said detent ring means having metering means which permit limited flow therethrough as said annular portions move through said restriction and means connecting its one side with its other side intermediate said annular portions so that the annular portion last to move out of the restriction is relatively freely movable back into the restriction until the other annular portion enters the restriction, and
said tubular members having means arranged to engage for imparting an up jar to the stuck object as the lower annular portion of the detent ring means is pulled upwardly out of the restriction and a down jar thereto as the upper annular portion of the detent ring means is pushed downwardly out of the restriction.

4 more elements

A hydraulic jar for use in applying up and down jars to an object stuck in a well bore, comprising

first and second telescopically arranged tubular members connectible, respectively, to the stuck object and a pipe string adapted to be raised and lowered within the well bore, and being circumferentially spaced apart and sealed with respect to one another along equal diameter portions to form an annular space therebetween,
the outer member having a port therein to connect one end of the space with the well bore,
a piston ring sealably slidable within the space to separate the port from a chamber within the space which contains hydraulic fluid,
one of said tubular members having a cylindrical restriction within the chamber and the other tubular member having longitudinal grooves formed about its circumference intermediate longitudinally spaced shoulders,
detent means carried by the other member with one side surrounding the grooves and the other side being closely slidable within the restriction to retard the flow of hydraulic fluid therepast and thus stretch the pipe string, as the second member is raised, and being closely slidable within the restriction to retard the flow of hydraulic fluid therepast, and thus compress the pipe string, as the second member is lowered,
said members having oppositely facing shoulders arranged to engage for imparting an up jar to the stuck object as the detent ring means is pulled upwardly out of the restriction and a down jar thereto as the detent ring means is pushed downwardly out of the restriction,
means on the other member sealably engaging the one member for closing the chamber intermediate the detent ring means and the piston ring,
means forming a longitudinal passageway through the chamber closing means,
a valve member movable between positions opening and closing the passageway, and
spring means urging the valve member to open position with a force less than that developed by the hydraulic fluid during movement of the detent ring means through the restriction in a direction toward the valve member.

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Dependencies are inferred from the claim text.

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Abstract

A hydraulic jar for use in applying up and down jars to an object stuck in a well bore, comprising

first and second telescopically arranged, tubular members connectible, respectively, to the stuck object and a pipe string adapted to be raised and lowered within the well bore, and being circumferentially spaced apart and sealed with respect to one another along equal diameter portions to form an annular space therebetween,
the outer member having a port therein to connect one end of the space with the well bore,
a piston ring sealably slidable within the space to separate the port from a chamber within the space which contains hydraulic fluid,
one of the tubular members having a cylindrical restriction within the chamber and the other tubular member having longitudinal grooves formed within a reduced diameter portion about its circumference intermediate longitudinally spaced upper and lower shoulders, and
detent ring means carried by the other member within the reduced diameter portion with one side closely surrounding the grooves and vertically reciprocable with respect to said other member between a first position in which its lower end is seated on the lower shoulder of the other member to prevent flow therepast, as a lower annular portion of its other side is pulled upwardly through the restriction, and a second position in which its upper end is seated on the upper shoulder of said other member to prevent flow therepast, as an upper annular portion of its other side is pushed downwardly through the restriction,
said detent ring means having metering means which permit limited flow therethrough as said annular portions move through said restriction and means connecting its one side with its other side intermediate said annular portions so that the annular portion last to move out of the restriction is relatively freely movable back into the restriction until the other annular portion enters the restriction, and
said tubular members having means arranged to engage for imparting an up jar to the stuck object as the lower annular portion of the detent ring means is pulled upwardly out of the restriction and a down jar thereto as the upper annular portion of the detent ring means is pushed downwardly out of the restriction.

4 more elements