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US2662505A - Hydraulic impact tool - Google Patents

Hydraulic impact tool Download PDF

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Publication number
US2662505A
US2662505A US231988A US23198851A US2662505A US 2662505 A US2662505 A US 2662505A US 231988 A US231988 A US 231988A US 23198851 A US23198851 A US 23198851A US 2662505 A US2662505 A US 2662505A
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US
United States
Prior art keywords
sleeve
hammer
housing
piston
fluid
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US231988A
Inventor
Jr William H Cline
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Hughes Tool Co
Original Assignee
Hughes Tool Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hughes Tool Co filed Critical Hughes Tool Co
Priority to US231988A priority Critical patent/US2662505A/en
Application granted granted Critical
Publication of US2662505A publication Critical patent/US2662505A/en
Anticipated expiration legal-status Critical
Application status is Expired - Lifetime legal-status Critical

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    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B4/00Drives used in the borehole
    • E21B4/06Down-hole impacting means, e.g. hammers
    • E21B4/14Fluid operated hammers

Description

Dec. 15, 1953 w, H CUNE, JR 2,662,505

HYDRAULIC IMPACT TOOL Filed June 1G, 1951 ze Q . .ATTORNEY of travel by upper and lower axially extending fins 26 and 21 of which the latter form a shoulder for the compression spring 28 having its upper end engaging shoulder 29 on the hammer whereby the hammer is constantly urged upwardly. Upward movement of the hammer under influence of the spring 28 moves the ball 30 into engagement with the seat 3I at the lower end of the valve sleeve I1 and hence normally holds the valve in engagement with its seat and the valve mechanism in its uppermost position when the tool is not in operation.

By way of further description of the invention and explanation of the operation of the disclosed embodiment, it will be assumed that the parts are in the relative positions shown in Fig. l of the drawings. The drill stem 2, the tool I and the bit 3 will be rotated in the usual manner. During such rotation, flushing uid is pumped downwardly through the drill stem 2 where it exerts a pressure upon the upper end of the piston I2 and the ball valve 30, whereby the piston I2, the valve sleeve I1, the ball 30 and the hammer 25 will be accelerated downwardly. When the piston I2 engages stops I4 travel of the piston is terminated but the continuing flow of fluid to and through the passage I3 in the piston will cause the valve sleeve to travel until the rib I9 on the sleeve engages the fiange I8 in the housing 4 whereupon travel of the sleeve is terminated. During the continued travel of the sleeve, energy transmitted by the pumped fluid continues to accelerate the hammer 25.

It is to be noted that the fluid pressure initiating the downward movement of the hammer is applied throughout an area equal to that of a circle having the outer diameter of the piston I2. Thus the energy of the pressure fluid is eiliciently used to accelerate the hammer 25 which is further accelerated by the fluid entering the passage I3 after the piston has engaged the stop I4. This action continues until the rib I9 on the valve sleeve II engages the flange I8 in the housing 4 at which time the hammer has attained its maximum velocity.

At the instant the rib I9 of the valve sleeve Il engages the ange I8 the ball valve 30 moves from its seat 3l and the fluid then flows unobstructedly about the hammer, through the passage 20 in the drive bushing and thence through the fluid passages in the bit 3 to rise-about the tool and drill stem as already explained.

It is apparent that there is a drop in fluid pressure as the fluid passes downwardly to and through the bit 3. Hence, the fluid pressure within the tool is greater than the pressure on its exterior, a condition of importance in the operation of the tool.

When the ball 30 leaves its seat, as illustrated in Fig. 7, the valve sleeve I1 moves upwardly until it engages the nether side of the piston I2. rIhis movement is brought about by the pressure within the tool upon an annular area of the sleeve having a cross section indicated as Ai. Such pressure is opposed by a pressure in the chamber 22 upon a like area on the upper end of the sleeve indicated as A2. Since the pressure within the tool is greater than that on its exterior as already explained, the differential pressure in an upward direction causes the valve sleeve to move upwardly. At the same time the hammer 25 continues its downward travel and engages the shank or anvil I0 on the drive bushing to impart energy by impact to the bit to supplement cutting` action thereby.

The hammer then moves upwardly and the ball 30 is again brought into engagement with its seat 3| on the valve sleeve Il. Pressure again builds up above the piston I2 and the ball 30 and such pressure decelerates the upward movement of the hammer. The valve sleeve I1 and the piston I2 move upwardly with the hammer until its velocity is reduced to zero whereupon the succeeding stroke is initiated.

Not only does the invention, described by reference to the embodiment shown in the drawings. obviate the use of springs to obtain desired valving action but the structure is also such that pressure fluid is applied to a piston of large cross section at those instants when a force of high magnitude is Anecessary to produce high ac- Celeration of the hammer at the beginning of its downward stroke and to produce high deceleration of the hammer as it approaches the end of its upward stroke.

The invention provides an impact tool capable of attaining the objects above set forth and also a tool havingr high operating eiliciency with a minimum of maintenance. While the description is directed to a specific embodiment it is understood that the construction and combination of the salient features of the invention may be altered without departing from the spirit of the invention.

The invention claimed is:

l. In a fluid actuated impact tool the combination comprising, a housing having a passage therethrough, there being spaced inlet and outlet for the admission and exhaust of actuating fluid to and from the housing, a reciprocable hammer within the housing intermediate the inlet and outlet, means for moving the hammer upwardly after an impact has been exerted thereby, a valve sleeve slidable axially of the housing and in sealing engagement therewith, said sleeve being engageable with the hammer to close the passage through the sleeve so that fluid pumped into the housing above the sleeve forces the sleeve and hammer downwardly, means for terminating the downward movement of the sleeve, whereby the seal between the sleeve and hammer is broken, means including an annular piston having a portion fitting telescopically within the sleeve so that the upper surface of the sleeve is isolated from fluid pressure applied to the interior of the sleeve, and additional means for subjecting said upper surface to the fluid pressure exteriorly of the housing so that the valve sleeve moves upwardly under dilerential pressures exerted thereon after said seal is broken.

2. In a iiuid actuated impact tool the combination comprising, a housing having a passage therethrough, there being spaced inlet and outlet for the admission and exhaust of actuating fluid to and from the housing, a reciprocable hammer within the housing intermediate the inlet and outlet, means for moving the hammer upwardly after an impact has been exerted thereby, an annular piston mounted for reciprocation in the housing above the hammer, stop means in the housing for limiting the movement of said piston, within the housing, a valve sleeve telescopically surrounding said piston and adapted to engage and form a seal with the hammer, Whereby the piston, sleeve and hammer move as a unit under pressure of fluid entering the housing above the piston, means for terminating downward movement of said sleeve after predetermined downward movement thereof relative to the piston, and means for thereafter hydraulically lifting the sleeve relative to the piston.

3. In a iluid actuated impact tool the combination comprising, a housing having a passage therethrough, there being spaced inlet and outlet for the admission and exhaust of actuating iluid to and from the housing, a reciprocable hammer within the housing intermediate the inlet and outlet, means for moving the hammer upwardly after an impact has been exerted thereby, an annular piston mounted for reciprocation in the housing, a valve sleeve slidably and sealably surrounding said piston and engageable with the hammer to close the passage through the housing, and a seal between said sleeve and the housing below the piston, there being a passage between the interior and exterior of the housing above said seal whereby the sleeve is subjected to the differential pressure between the interior and exterior of the housing and moves to an upward position when the hammer moves from engagement with the sleeve.

4. In a fluid actuated impact tool, a tubular housing having spaced inlet and outlet for the admission and exhaust of the actuating uid to and from the housing, an inwardly extending flange in the housing and spaced from the upper end thereof to form upper and lower chambers in the housing a valve sleeve slidable within said ange, an annular piston reciprocable in the upper chamber and having telescopic relation with said sleeve, whereby an annular chamber is formed about said sleeve, there being a port in the housing between said annular chamber and the exterior of the housing, a hammer reciprocably mounted in the lower chamber, and means normally urging said hammer in an upward direction to engage and form a seal with said sleeve to close the passage through the tool.

5. In a fluid actuated impact tool, a tubular housing having spaced inlet and outlet for the admission and exhaust of the actuating iluid t0 and from the housing, a valve assembly reciprocably mounted therein, and comprising, an annular piston and a valve sleeve mounted for telescopic movement, separate means for limiting the downward travel of the piston and for thereafter terminating downward movement of the valve sleeve whereby the piston and sleeve are in extended position, a seal between the sleeve and housing whereby an annular chamber is formed about the valve assembly, there being a passage between said chamber and the exterior of the housing, a hammer reciprocably mounted in the housing below said valve assembly, a seat on said sleeve engageable by said hammer to close the passage through the tool, and means normally urging the hammer in an upward direction to engage said seat.

WILLIAM H. CLINE, JR.

References Cited in the le of this patent UNITED STATES PATENTS Number Name Date 2,507,585 Bassinger May 16, 1950 2,584,979 Bassinger Feb. 12, 1.952

US231988A 1951-06-16 1951-06-16 Hydraulic impact tool Expired - Lifetime US2662505A (en)

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US231988A US2662505A (en) 1951-06-16 1951-06-16 Hydraulic impact tool

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US231988A US2662505A (en) 1951-06-16 1951-06-16 Hydraulic impact tool

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US2662505A true US2662505A (en) 1953-12-15

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2764130A (en) * 1952-07-24 1956-09-25 Bassinger Ross Fluid actuated impact tool
US2873093A (en) * 1956-09-19 1959-02-10 Jersey Prod Res Co Combined rotary and percussion drilling apparatus
US3136366A (en) * 1958-08-22 1964-06-09 Brown Coupling devices

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2507585A (en) * 1946-07-26 1950-05-16 Bassinger Ross Percussion tool for wells
US2584979A (en) * 1948-09-24 1952-02-12 Bassinger Ross Percussion tool

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2507585A (en) * 1946-07-26 1950-05-16 Bassinger Ross Percussion tool for wells
US2584979A (en) * 1948-09-24 1952-02-12 Bassinger Ross Percussion tool

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2764130A (en) * 1952-07-24 1956-09-25 Bassinger Ross Fluid actuated impact tool
US2873093A (en) * 1956-09-19 1959-02-10 Jersey Prod Res Co Combined rotary and percussion drilling apparatus
US3136366A (en) * 1958-08-22 1964-06-09 Brown Coupling devices

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