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Hydraulic Hammer with Feed/Vent Flowtube for Extended Reach Applications

IP.com Disclosure Number: IPCOM000250475D
Publication Date: 2017-Jul-24
Document File: 4 page(s) / 90K

Publishing Venue

The IP.com Prior Art Database

Abstract

This tool uses an internal Flowtube to feed and discharge high pressure fluid through it to move a piston back and forth along the feed tube. The design can be such to where the piston strikes the bottom sub at the lower end of its travel. Such action causes a vibrational motion of the tool and the string it is in, which reduces the friction between the lower bottom hole assembly (BHA) parts and the inside diameter (ID) of the well casing. This allows the tool string to be moved further into the wellbore more easily. This allows this hydraulic hammer to operate more efficiently and with a higher power per unit of fluid pressure than those hammers that have an upper sleeve. (Some hydraulic "hammer" tools employee an upper sleeve with passages machined into it to distribute the fluid to the top and bottom of the piston. The upper sleeve is much larger in diameter than is the Flowtube, and therefore has to be manufactured from a larger piece of steel bar, resulting in a cost of the tool. In the design mentioned above, all of the fluid introduced into this hammer is used to operate the piston. This may create a higher level of energy for the given flow of fluid than is desired. A choke may be placed in the lower end of the Feed Chamber of the Flowtube to bypass a portion of the supply fluid through the hammer without the fluid doing any work upon the piston. This choke is a common feature in most pneumatic and hydraulic hammer designs. However, in these designs which have the upper sleeve, the choke is placed in an internal component in the upper section of the hammer, and the fluid bypassed enters into the Tool Top Chamber before being exhausted. This creates a back pressure in the hammer thus lessening its performance. With the Flowtube, the choke is placed in the Flowtube Feed chamber, and the fluid bypassed through it travels directly out of the bottom of the hammer without any of it entering into either of the Tool chambers. This novel feature allows the Flowtube hammer to have a higher performance.

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This is the abbreviated version, containing approximately 46% of the total text.

Hydraulic Hammer with Feed/Vent Flowtube for Extended Reach Applications

This tool uses an internal Flowtube to feed and discharge high pressure fluid through it to

move a piston back and forth along the feed tube. The design can be such to where the piston

strikes the bottom sub at the lower end of its travel. Such action causes a vibrational motion of

the tool and the string it is in, which reduces the friction between the lower bottom hole assembly

(BHA) parts and the inside diameter (ID) of the well casing. This allows the tool string to be

moved further into the wellbore more easily. This allows this hydraulic hammer to operate more

efficiently and with a higher power per unit of fluid pressure than those hammers that have an

upper sleeve. (Some hydraulic “hammer” tools employee an upper sleeve with passages

machined into it to distribute the fluid to the top and bottom of the piston. The upper sleeve is

much larger in diameter than is the Flowtube, and therefore has to be manufactured from a larger

piece of steel bar, resulting in a cost of the tool. In the design mentioned above, all of the fluid

introduced into this hammer is used to operate the piston. This may create a higher level of

energy for the given flow of fluid than is desired. A choke may be placed in the lower end of the

Feed Chamber of the Flowtube to bypass a portion of the supply fluid through the hammer

without the fluid doing any work upon the piston. This choke is a common feature in most

pneumatic and hydraulic hammer designs. However, in these designs which have the upper

sleeve, the choke is placed in an internal component in the upper section of the hammer, and the

fluid bypassed enters into the Tool Top Chamber before being exhausted. This creates a back

pressure in the hammer thus lessening its performance. With the Flowtube, the choke is placed in

the Flowtube Feed chamber, and the fluid bypassed through it travels directly out of the bottom

of the hammer without any of it entering into either of the Tool chambers. This novel feature

allows the Flowtube hammer to have a higher performance.

The tool begins operation with the piston at the lowest end of its travel, usually resting on

the bottom sub. High pressure fluid is then applied to the tool, which flows from the Top Sub

through the Feed Chamber of the Flowtube, through the piston port and into the Tool Bottom

Chamber. The piston rises and after traveling a small distance it closes off an open vent port. As

the piston continues to rise, it then closes off the feed port and opens the feed port into the Top

Tool Chamber. As fluid fills the Tool Top Chamber, the piston begins to slow, and then reverses

direction now traveling downward towards the Bottom Sub. As the Piston travels downwards,

the Top Feed port is closed, the Top Vent port is opened reducing pressure in the top chamber,

the lower vent port is closed, and finally near the lower end of the piston travel the bottom feed

port is re-opened. This allow...