Patent application number | Description | Published |
20090301707 | DOUBLE-ACTING JAR - A double-acting jar comprises an inner mandrel and an outer housing. The inner mandrel is disposed telescopically within the outer housing to define a fluid chamber in between. There is an uphole restriction and a downhole restriction spaced from one another within the fluid chamber. A uphole valve is disposed within the fluid chamber, the uphole valve having a first seating surface engageable with an uphole facing sealing shoulder in the fluid chamber. The uphole valve has a first exterior surface that fits with close tolerance within the uphole restriction over at least a portion of the first exterior surface. There is a downhole valve disposed within the fluid chamber, the downhole valve having a second seating surface engageable with a downhole facing sealing shoulder in the fluid chamber. The downhole valve has a second exterior surface that fits with close tolerance within the downhole restriction over at least a portion of the first exterior surface. There are first jarring surfaces on the inner mandrel and outer housing respectively for jarring contact with each other during an upjar, and second jarring surfaces on the inner mandrel and outer housing respectively for jarring contact with each other during downjar. The uphole restriction and downhole restriction are separated such that when the downhole restriction slides upward over the initial portion of the downhole valve to seat the downhole valve, at least a portion of the uphole restriction extends upwardly beyond the downhole end of the uphole valve sufficient to allow a downjar to be carried out. The uphole restriction and downhole restriction are also separated such that when the uphole restriction slides downward over the initial portion of the uphole valve to seat the uphole valve, at least a portion of the downhole restriction extends downwardly beyond the uphole end of the downhole valve sufficient to allow an upjar to be carried out. | 12-10-2009 |
20090308593 | DOUBLE-ACTING JAR COMPOUNDER - A double-acting jar compounder is disclosed having a first end and a second end, and comprising an outer housing, an upper mandrel, and a lower mandrel. The upper mandrel defines the first end. The upper mandrel is at least partially disposed telescopically within the outer housing to define an uphole fluid chamber between the upper mandrel and the outer housing, the upper mandrel defining the second end. The lower mandrel is at least partially disposed telescopically within the outer housing to define a downhole fluid chamber between the lower mandrel and the outer housing. The uphole fluid chamber and the downhole fluid chamber each contain fluid, have a variable stroke-dependent volume, and are sealed at an uphole end and a downhole end. The upper mandrel has a first shoulder engagable with and facing a second shoulder of the lower mandrel to move the lower mandrel during at least a portion of a downjar or upjar stroke. | 12-17-2009 |
20100307739 | Double-Acting Jar - A double-acting jar is disclosed comprising: an outer housing; an inner mandrel at least partially disposed telescopically within the outer housing to define a fluid chamber between the inner mandrel and the outer housing, the fluid chamber containing fluid and being sealed; a valve disposed within the fluid chamber on one of the inner mandrel and the outer housing; the valve having a downhole portion that is movable between a downhole seated position in which the valve seats against the one of the inner mandrel and the outer housing and an unseated position, the downhole portion having a downhole restriction surface; the valve having an uphole portion that is movable between an uphole seated position in which the valve seats against the one of the inner mandrel and the outer housing and an unseated position, the uphole portion having an uphole restriction surface; the other of the outer housing and the inner mandrel having a cooperating restriction surface that cooperates with the downhole restriction surface and the uphole restriction surface to set the double-acting jar for a jar, the cooperating restriction surface being dimensioned so that, from relative movement of the inner mandrel and the outer housing, the cooperating restriction surface is movable from above to below the valve with a neutral position in which a portion of the cooperating restriction surface is between the downhole restriction surface and the uphole restriction surface; the downhole restriction surface incorporating a first bypass that is configured to allow bypass of fluid in the chamber when the downhole restriction surface and the cooperating restriction surface move past each other during re-setting of the jar; the uphole restriction surface incorporating a second bypass that is configured to allow bypass of fluid in the chamber when the uphole restriction surface and the cooperating restriction surface move past each other during re-setting of the jar; first jarring surfaces on the inner mandrel and outer housing respectively for jarring contact with each other during a jar in a downhole direction; and second jarring surfaces on the inner mandrel and outer housing respectively for jarring contact with each other during a jar in an uphole direction. | 12-09-2010 |
20120261114 | DOWNHOLE MAGNET TOOL AND METHOD OF ASSEMBLY - A downhole magnet tool is disclosed comprising a top sub having an inner bore terminating in a downhole facing open end, the inner bore defining a centralizer receptacle of smaller width than a width of the downhole facing open end, a mandrel terminating upwardly in a centralizer stem, the centralizer stem being fitted in the centralizer receptacle of the top sub, and a magnet mounted on a downhole facing surface of the mandrel. A method of assembly of a downhole magnet tool is also disclosed. | 10-18-2012 |
Patent application number | Description | Published |
20090301707 | DOUBLE-ACTING JAR - A double-acting jar comprises an inner mandrel and an outer housing. The inner mandrel is disposed telescopically within the outer housing to define a fluid chamber in between. There is an uphole restriction and a downhole restriction spaced from one another within the fluid chamber. A uphole valve is disposed within the fluid chamber, the uphole valve having a first seating surface engageable with an uphole facing sealing shoulder in the fluid chamber. The uphole valve has a first exterior surface that fits with close tolerance within the uphole restriction over at least a portion of the first exterior surface. There is a downhole valve disposed within the fluid chamber, the downhole valve having a second seating surface engageable with a downhole facing sealing shoulder in the fluid chamber. The downhole valve has a second exterior surface that fits with close tolerance within the downhole restriction over at least a portion of the first exterior surface. There are first jarring surfaces on the inner mandrel and outer housing respectively for jarring contact with each other during an upjar, and second jarring surfaces on the inner mandrel and outer housing respectively for jarring contact with each other during downjar. The uphole restriction and downhole restriction are separated such that when the downhole restriction slides upward over the initial portion of the downhole valve to seat the downhole valve, at least a portion of the uphole restriction extends upwardly beyond the downhole end of the uphole valve sufficient to allow a downjar to be carried out. The uphole restriction and downhole restriction are also separated such that when the uphole restriction slides downward over the initial portion of the uphole valve to seat the uphole valve, at least a portion of the downhole restriction extends downwardly beyond the uphole end of the downhole valve sufficient to allow an upjar to be carried out. | 12-10-2009 |
20090308593 | DOUBLE-ACTING JAR COMPOUNDER - A double-acting jar compounder is disclosed having a first end and a second end, and comprising an outer housing, an upper mandrel, and a lower mandrel. The upper mandrel defines the first end. The upper mandrel is at least partially disposed telescopically within the outer housing to define an uphole fluid chamber between the upper mandrel and the outer housing, the upper mandrel defining the second end. The lower mandrel is at least partially disposed telescopically within the outer housing to define a downhole fluid chamber between the lower mandrel and the outer housing. The uphole fluid chamber and the downhole fluid chamber each contain fluid, have a variable stroke-dependent volume, and are sealed at an uphole end and a downhole end. The upper mandrel has a first shoulder engagable with and facing a second shoulder of the lower mandrel to move the lower mandrel during at least a portion of a downjar or upjar stroke. | 12-17-2009 |
20100307739 | Double-Acting Jar - A double-acting jar is disclosed comprising: an outer housing; an inner mandrel at least partially disposed telescopically within the outer housing to define a fluid chamber between the inner mandrel and the outer housing, the fluid chamber containing fluid and being sealed; a valve disposed within the fluid chamber on one of the inner mandrel and the outer housing; the valve having a downhole portion that is movable between a downhole seated position in which the valve seats against the one of the inner mandrel and the outer housing and an unseated position, the downhole portion having a downhole restriction surface; the valve having an uphole portion that is movable between an uphole seated position in which the valve seats against the one of the inner mandrel and the outer housing and an unseated position, the uphole portion having an uphole restriction surface; the other of the outer housing and the inner mandrel having a cooperating restriction surface that cooperates with the downhole restriction surface and the uphole restriction surface to set the double-acting jar for a jar, the cooperating restriction surface being dimensioned so that, from relative movement of the inner mandrel and the outer housing, the cooperating restriction surface is movable from above to below the valve with a neutral position in which a portion of the cooperating restriction surface is between the downhole restriction surface and the uphole restriction surface; the downhole restriction surface incorporating a first bypass that is configured to allow bypass of fluid in the chamber when the downhole restriction surface and the cooperating restriction surface move past each other during re-setting of the jar; the uphole restriction surface incorporating a second bypass that is configured to allow bypass of fluid in the chamber when the uphole restriction surface and the cooperating restriction surface move past each other during re-setting of the jar; first jarring surfaces on the inner mandrel and outer housing respectively for jarring contact with each other during a jar in a downhole direction; and second jarring surfaces on the inner mandrel and outer housing respectively for jarring contact with each other during a jar in an uphole direction. | 12-09-2010 |
20120261114 | DOWNHOLE MAGNET TOOL AND METHOD OF ASSEMBLY - A downhole magnet tool is disclosed comprising a top sub having an inner bore terminating in a downhole facing open end, the inner bore defining a centralizer receptacle of smaller width than a width of the downhole facing open end, a mandrel terminating upwardly in a centralizer stem, the centralizer stem being fitted in the centralizer receptacle of the top sub, and a magnet mounted on a downhole facing surface of the mandrel. A method of assembly of a downhole magnet tool is also disclosed. | 10-18-2012 |
Patent application number | Description | Published |
20090301707 | DOUBLE-ACTING JAR - A double-acting jar comprises an inner mandrel and an outer housing. The inner mandrel is disposed telescopically within the outer housing to define a fluid chamber in between. There is an uphole restriction and a downhole restriction spaced from one another within the fluid chamber. A uphole valve is disposed within the fluid chamber, the uphole valve having a first seating surface engageable with an uphole facing sealing shoulder in the fluid chamber. The uphole valve has a first exterior surface that fits with close tolerance within the uphole restriction over at least a portion of the first exterior surface. There is a downhole valve disposed within the fluid chamber, the downhole valve having a second seating surface engageable with a downhole facing sealing shoulder in the fluid chamber. The downhole valve has a second exterior surface that fits with close tolerance within the downhole restriction over at least a portion of the first exterior surface. There are first jarring surfaces on the inner mandrel and outer housing respectively for jarring contact with each other during an upjar, and second jarring surfaces on the inner mandrel and outer housing respectively for jarring contact with each other during downjar. The uphole restriction and downhole restriction are separated such that when the downhole restriction slides upward over the initial portion of the downhole valve to seat the downhole valve, at least a portion of the uphole restriction extends upwardly beyond the downhole end of the uphole valve sufficient to allow a downjar to be carried out. The uphole restriction and downhole restriction are also separated such that when the uphole restriction slides downward over the initial portion of the uphole valve to seat the uphole valve, at least a portion of the downhole restriction extends downwardly beyond the uphole end of the downhole valve sufficient to allow an upjar to be carried out. | 12-10-2009 |
20090308593 | DOUBLE-ACTING JAR COMPOUNDER - A double-acting jar compounder is disclosed having a first end and a second end, and comprising an outer housing, an upper mandrel, and a lower mandrel. The upper mandrel defines the first end. The upper mandrel is at least partially disposed telescopically within the outer housing to define an uphole fluid chamber between the upper mandrel and the outer housing, the upper mandrel defining the second end. The lower mandrel is at least partially disposed telescopically within the outer housing to define a downhole fluid chamber between the lower mandrel and the outer housing. The uphole fluid chamber and the downhole fluid chamber each contain fluid, have a variable stroke-dependent volume, and are sealed at an uphole end and a downhole end. The upper mandrel has a first shoulder engagable with and facing a second shoulder of the lower mandrel to move the lower mandrel during at least a portion of a downjar or upjar stroke. | 12-17-2009 |
20100307739 | Double-Acting Jar - A double-acting jar is disclosed comprising: an outer housing; an inner mandrel at least partially disposed telescopically within the outer housing to define a fluid chamber between the inner mandrel and the outer housing, the fluid chamber containing fluid and being sealed; a valve disposed within the fluid chamber on one of the inner mandrel and the outer housing; the valve having a downhole portion that is movable between a downhole seated position in which the valve seats against the one of the inner mandrel and the outer housing and an unseated position, the downhole portion having a downhole restriction surface; the valve having an uphole portion that is movable between an uphole seated position in which the valve seats against the one of the inner mandrel and the outer housing and an unseated position, the uphole portion having an uphole restriction surface; the other of the outer housing and the inner mandrel having a cooperating restriction surface that cooperates with the downhole restriction surface and the uphole restriction surface to set the double-acting jar for a jar, the cooperating restriction surface being dimensioned so that, from relative movement of the inner mandrel and the outer housing, the cooperating restriction surface is movable from above to below the valve with a neutral position in which a portion of the cooperating restriction surface is between the downhole restriction surface and the uphole restriction surface; the downhole restriction surface incorporating a first bypass that is configured to allow bypass of fluid in the chamber when the downhole restriction surface and the cooperating restriction surface move past each other during re-setting of the jar; the uphole restriction surface incorporating a second bypass that is configured to allow bypass of fluid in the chamber when the uphole restriction surface and the cooperating restriction surface move past each other during re-setting of the jar; first jarring surfaces on the inner mandrel and outer housing respectively for jarring contact with each other during a jar in a downhole direction; and second jarring surfaces on the inner mandrel and outer housing respectively for jarring contact with each other during a jar in an uphole direction. | 12-09-2010 |
20120261114 | DOWNHOLE MAGNET TOOL AND METHOD OF ASSEMBLY - A downhole magnet tool is disclosed comprising a top sub having an inner bore terminating in a downhole facing open end, the inner bore defining a centralizer receptacle of smaller width than a width of the downhole facing open end, a mandrel terminating upwardly in a centralizer stem, the centralizer stem being fitted in the centralizer receptacle of the top sub, and a magnet mounted on a downhole facing surface of the mandrel. A method of assembly of a downhole magnet tool is also disclosed. | 10-18-2012 |