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Publication numberUS1750627 A
Publication typeGrant
Publication dateMar 18, 1930
Filing dateOct 15, 1928
Priority dateOct 15, 1928
Publication numberUS 1750627 A, US 1750627A, US-A-1750627, US1750627 A, US1750627A
InventorsCrum Roland R
Original AssigneeH C Smith Mfg Company
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Expansible underreamer
US 1750627 A
Abstract  available in
Images(2)
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Claims  available in
Description  (OCR text may contain errors)

March 18, 1930.

R. R.v cRUM 4 1,750,627

ExPANs'IBLE UNDERREAMER Filed Oct. l5. 1928 Z-Sheets-Sheet l 4 A TTORNEYJr March 18, R R. CRUM K I EXPANSIBLE UNDERREAMER 2 Shoots-Sheet 2 m. m ,i A ,3 w .4 Q/V a 5 4 a 1 n l 7 N /f/ Y* 7, f 2 w l N w ATTORNEYr Patented Mar. 18, 1930 yUNITED STATES PATENT OFFICE ROLAND B. CRUI, OF WHITTIER, CALIFORNIA, ASSIGNOR TO H. C. SMITH MANUFAC- TURING COMPANY, 0F WHITTIER, CALIFORNIA, A CORPORATION OF CALIFORNIA EXPANSIBLE UNDERREAMER Application led October 15, 1928. Serial No. 312,474.

This invention relates to an expansible underreamer having a longitudinally movable cutter arranged to be moved laterally to and from the body to expand and collapse the underreamer. The present invention contemplates the provision of a sloping surface for engagement by a complementary surface on a cutter member to cause the cutter member to be moved laterally on longitudinal movement thereof.

The objects of this invention are to provide an underreamer of the character described having any or all of the following features hydraulic means for actuating the cutters; such hydraulic means operated by the pressure of circulation Huid employed in hydraulic drilling; and novel features of construction contributing to simplicity, durability and certainty in operation.

These objects together with other objects and corresponding accomplishments are obtained by means of the embodiment of my invention illustrated in the accompanying drawing, in which Fig. 1 is an elevation of an underreamer'; Fig. 2 is a central longitudinal section showing the underreamer parts incollapsed position; Fig. 3 is a central longitudinal section showing the underreamer parts in expanded position; Fig. 4 is a section as seen on the line 4.-4 of Fig. 3; and Figs. 5 and 6 are sections as seen on the lines correspondingly numbered in Fig. 1.

Referring more particularly to the drawing, 10 indicates a body having a pin 11 at its upper end for attachment to a drill string and a bit 12 at the lower end for drilling. It will be understood that the. bit forms no part of the present invention, and that the body of the underreamer may be constructed for detachably securing drilling tools of various characters thereto. The body is illustrated as formed of two parts secured together by a box and pin connection, the

upper part having a circulation passage 13 extending therethrough. The lower portion of the bit hasan enlarged cylindric chamber 14 serving as a cylinder for a piston. The circulation passage is vextended through the body as indicated by 15 opening through water courses to flush the bit 12. A relief port 16 communicates with the cylinder chamber. Extending longitudinally of the body are three lcavities 17 to accommodate three cutter members. However, the invention is not limited to any particular number of cutter members. The cavities are duplicates of one another as are the cutters disposed therein and it will be suiiicient to de scribe one. The inner wall of a cavity is stepped and intermediate the steps is a ramp 18 sloping upwardly and outwardly. The outer stepped surface serves as a supporting surface for a bearing block on the cutter members later described. A slot 19 extending longitudinally of the body is formed in the step for accommodating a cross pin. Ranging downwardly from the cylinder chamber is an opening 2O for slidingly receiving a vconnecting rod. A pivot pin 21 spans Vthe cavity at its lower end. V

Fulcrumed to the body on the pivot pins 21 are lower shaft blocks 22, each having an elongated slot 23 of such width as to provide for a limited lateral play of the block, there. being a bearing face 24 on the block to rest against the inner wall yof the cavity in expanded position of the cutter. 'A socket is provided in each block to receive the end of a cutter shaft 25 having cutter rollers 26 journalled thereon. At lthe 'upper end of shaft 25 and secured thereto isa shaft block 27 having an opening extending therethrough in'which may be disposed a cross pin 28. The opening is enlarged at its outer face to accommodate a nut on the end yof the pin, and the reduced portion is enlarged sufficiently to allow a slight play of the piny in the opening. The inner upper face of block 27 is bevelled so as to provide a sloping surface 29 complementary to the ramp 18. A slot is also provided to accommodate a connecting rod joined to the cross pin.

Disposed within the piston chamber 14 and secured thereto in any suitable manner such as by welding or a shrunk fit is a head 30. The head has a tubular extension 31 and slidingly mounted thereon is a piston 32. A connecting rod 33 for each cutter is secured to the piston and at the lower end is attached to a cross pin 28. A. number of Vpassages 34 open from the workingend of fluid under pressure and passage of the cutters below and out of the casing, the piston 32 will be moved upwardly carrying the cutter members and causing them to ride outwardly upon their` ramps into position with the rear faces of the blocks 27 resting against the outer steps and serving as a support for the upper ends of the cutters.

l/Vhat I claim is 1. In an underreamer, the combination of a body, having a longitudinally extending cavity in its periphery with a stepped inner surface at one end and an outwardly sloping ramp intermediate the steps, a cutter accommodated in said cavity for longitudinal play therein and having a connection to said body so that it may be moved laterally thereon into and out of expanded position, a supporting block secured to said cutter adjacent to said ramp, said block having a supporting surface to engage and coact with the outer step and a sloping bearing surface for engaging said ramp to cause said cutter to be projected upon upward movement thereof into expanded position, a cylinder chamber communicating with a source of iuid pressure, a piston in said cylinder, and a connecting rod for actuating said cutter to move the latter longitudinally upon introduction of l fluid under pressure into said chamber so as to cause said block to rideI outwardly over said ramp into position with said supporting lsEurface overlapping the outer stepped surace. l

F". In an underreamer, the combination of a body having a longitudinally extending cavity in its periphery with a stepped inner surface adjacent one end and an outwardly sloping ramp intermediate the steps, a cutter accommodated in said cavity for longitudinal play therein and having a fulcrum connection to said body so that it may be rocked laterally thereon into and out lof expanded position, a block secured to said cutter at the end opposite to said fulcrum and having a supporting surface to engage and coact with the outer step and a sloping bearing surface for engaging said ramp to cause said cutter to be projected upon longltudinal .1 movement thereof into expanded position, a

cylinder chamber communicating with a source of fluid pressure, a. piston in said chamber, and a connecting rod for actuating said cutter to move the latter longitudinally upon introduction of fluid under pressure into said chamber so as to cause said 'block to ride outwardly over said ramp into position with said supporting surface overlapping the outer step surface.

3. In an underreamer, the combination o'f a body having a longitudinally extending cavity in its periphery with a stepped inner surface at its upper end and an outwardly sloping ramp intermediate the steps, a cut ter accommodated in said cavity for longitudinal play therein and having a connection to saidbody so that it may be moved laterally thereon into and out of expanded position, a block secured to said cutter at its upper end and having a supporting surface to engage and coact with the outer step and a sloping bearing surface for engaging said ramp toI cause said cutter to be projected upon upward movement thereof into expanded position, a cylinder chamber communieating with a source of fluid pressure, a piston in said chamber, and a connecting rod for actuating said cutter to move the latter upwardly upon introduction of fluid under pressure into said chamber so as to cause said block to ride outwardly over said ramp into position with said supporting surface overlapping the outer step surface.

4. In an underreamer, the combination of a body having a longitudinally extending cavity in its periphery with a stepped inner surface at` its upper end and an outwardly sloping ramp intermediate the steps, a cutter accommodated in said cavity for longitudinal play therein and having a fulcrum connection to said body at its lower end so that it may be rocked laterally thereon into and out of expanded position, a block secured to said cutter at its upper end and having a supporting surface to engage and coact with the outer step and a sloping bearing surface for engaging said ramp to cause said cutter to be projected upon upward movement thereof into expanded position, a cylinder chamber communicating with a source of fluid pressure, a piston in said chamber, and a connecting rod for actuating said cutter to move the latter upwardly upon introduction of fluid under pressure into said chamber so as to cause said block to' ride outwardly over said ramp into position with said supporting surface overlapping the outer step surface.

5. In an underreamer, the combination of a body having a longitudinally extending cavity in its periphery with a stepped inner surface at its upper end and an outwardly sloping ramp intermediate the steps, a cutter accommodated in said cavity for longitudinal play therein and having a connection to said body so that said cutter may be moved laterally into and out of expanded position, a block secured to said cutter at its upper end and having a supporting surface to engage and coactwith the outer step and a sloping bearing surface for engaging said ramp to cause said cutter to be projected upward upon upward movement thereof into expanded position, a cylinder chamber in f sloping ramp intermediate the steps, a cutter accommodated in said cavity for longitudinal play therein and having a fulcrum connec-Y tion to said body at its lower end so that said cutter may be rocked laterally into and out of expanded position, a block secured to said cutter at its upper end and having a supporting surface to engage and coact withthe outer step and a sloping bearing surface for engaging said ramp to cause said cutter to be projected upon upward movement thereof into expanded position, a. cylinder chamber in said body above said cutter communicating with a source of uid pressure,`a'piston in said c linder, and a connecting rod depending om said piston for actuating said cutter and causing it to be moved-,upwardly upon introduction of fluid pressurejnto said chamber so as to cause said block to ride outwardly over said ramp into position with said supporting surface step surface.

7. In an underreamer, the combination of Y a body having a longitudinally extending cavity in-its periphery with an outwardly. sloping ramp .at its upper end, a cutter accommodated in saidfcavity for-longitudinal play therein and having a connection to said body so that it niay be moved laterally thereon into and out of expanded position, a block secured to said cutter at its'upper end and having a sloping bearing surface for engaging said ramp -to cause said cutter to be pron upward movement thereof into a cylinder chamber in said body communicating with a source of fluid* pressure, a piston 1n said chamber, and-a connecting rod forsaid piston and said cutterto cause the latter to be moved `upwardly overlapping the outer expande position,

`upon introduction of fluid pressure into said chamber so as tocause said block to ride outwardly over .said ramp with said cutter in g expanded position.

, duction ofl fluid pressure into sai 8. In an underreamer, the combination of a body having a longitudinally extending cavity in its periphery with an outwardly sloping ramp at its upper end, a cutter accommodated in said cavity for longitudinal play therein and having a connection to said ody so that it may be moved laterally thereon into and out of expanded position, a block secured to said cutter at its upper end and" having a sloping bearing surface for rengaging said ramp to cause said cutter to be projected upon upward movement thereof into expandedpositon, a cylinder chamber in said body above said cutter communicating with a source of fluid pressure, a piston in said cylinder, a connecting rod depending from said piston for actuating said cutter and causing it to be moved upwardly upon introduction of fluid pressure into said chamber so as to cause said block to rideoutwardly over said ramp into position with said cutter projected.

9. In an underreamer, the combination of a body having a longitudinally extending cavity in its 'periphery with an outwardly sloping ramp at its upper end, a cutter accommodated in said cavity for longitudinal play therein and having a fulcrum connec. tion to said body at its lower end so that it .may be rocked laterally thereon into and 'out of expanded position, a block secured to said icutter at its upper end and having a sloping -surface for engaging said'ramp to cause said cutter to be proiected u on upward movement thereof into expand inder chamber in said body communicatlng witha sourcev of fluid pressurefa piston in said cylinder, and a connecting rod for said piston and cutter to actuate the latter and cause it to be moved upwardly u on introso as to cause said block to ride outwardly over said ramp into position-'with said cutter expanded. f

10. In an underreamer, the combination of a body having a longitudinally extending cavity in its periphery with an outwardly sloping ramp at its upper end, a cutter accommodated in said cavity for longitudinal play therein and having a fulcrum connection to said body so that' itmay be rocked laterally thereon into and out of expanded position, a blocksecured to said cutter at its upper end and havin a sloping bearing surface for engaging said ramp to cause said cutter to be projected upon upward movement 'thereof into expanded position, a cylinder chamber'in said body above said cutter communicating with a source of fluid pressure, a

Y piston in said cylinder chamber`, and a connecting rod ndepending from said piston for actuating said cutter and causing it toy be moved u wardly upon introduction of Huid pressure lnto said chamber so as to cause said block to ride outwardly over said ramp into ed position, a c ylchamber ill position with said cutter in expanded position.

11. In an underreamer', the combination of a body having a longitudinally extending cavity in its periphery with an outwardly sloping ramp at its upper end, a cutter accommodated in said cavity for longitudinal play therein and having a connection to said body so that it may be moved laterally thereon into and out of expanded position, a block secured to said cutter at its upper end and having a sloping bearing surface for engaging said ramp to cause said cutter to be projected upon upward movement thereof into expanded position, a circulation passage in said body, a piston chamber in said body, a piston in said chamber, a conduit connecting said circulation passage to the cylinder space below said piston, and a connecting rod for said piston and said cutter to actuate the latter and cause it to be moved upwardly upon introduction of circulation pressure into said chamber so as to cause said block to ride upwardly over said ramp into position with said cutter expanded.

12. In an underreamer, the combination of a body having a longitudinally extending cavity in its periphery with an outwardly'sloping ramp at its upper end,a cutter accommodated in said cavity for longitudinal play therein and having a connection to said body so that it may be moved laterally thereon into and out of expanded position, a block secured to said cutter at its upper end and having a sloping bearing surface engaging said ramp to cause said cutter to be projected upon upward movement thereof into expanded position, a circulation passage in said body, a piston chamber in said body located above said cutter, a piston in said chamber, a conduit connecting vsaid circulation passage to the cylinder chamber space below said piston, and a connecting rod depending from said piston for actuating said cutter and causing it to be moved upwardly upon introduction of circulation pressure into said `chamber so as to cause said block to ride outwardly over said ramp into position with said cutter expanded.

13. In .an underreamer, the combination of a body having a longitudinally extending' cavity in its periphery with a stepped inner surface at its upper end and an outwardly sloping ramp intermediate the ste s, a cutter accommodated in said cavity or longitudinal play therein and having a connection to said body so that said cutter maybe moved laterally into and out of expanded position a block secured to said cutter at its upper end and having a supporting surface to engage f and coact with the outer step and a sloping bearing surface engaging said ramp to cause sald cutter to be proJected upon upward movement thereof into expanded position, a

circulation passage in said body, a piston chamber in said body, a. piston in said chamber, a conduit connecting said circulation passage to the cylinder space below said piston, and a connecting rod for said piston and said cutter to actuate the latter and cause it to be moved upwardly upon introduction of circulation pressure into said chamber so as to cause said block to ride outwardly over said ramp into position with said supporting surface overlapping the outer step surface.

MQ In an underreamer, the combination of a body having a longitudinally extending cavity in its periphery with a stepped inner surface at its upper end and an outwardly sloping ramp intermediate the steps, a cutter accommodated in said cavity for longitudinal play therein and having a fulcrum connection to said body at its lower end so that said cutter may be rocked laterally into and'out of expanded position, a block secured to said cutter at its upper end and having a supporting surface to engage and coact with the outer step and a sloping bearing surface for engaging said ramp to cause said cutter to be projected upon upward movement thereof into expanded position, a circulation passage in said body, a piston chamber in said body above said cutter, a piston in said chamber, a conduit connecting said circulation passage to the cylinder chamber space below said piston, and a connecting rodvdepending from said piston for actuating said cutter and causing it to be moved upwardly upon introduction of fluid pressure to said chamber so as to cause said block to ride outwardly over

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2457628 *Jun 17, 1942Dec 28, 1948Baker Oil Tools IncUnderreamer
US6598678 *Nov 13, 2000Jul 29, 2003Weatherford/Lamb, Inc.Apparatus and methods for separating and joining tubulars in a wellbore
US6851475Mar 14, 2003Feb 8, 2005Weatherford/Lamb, Inc.Apparatus and methods for separating and joining tubulars in a wellbore
US6899181Jan 22, 2003May 31, 2005Weatherford/Lamb, Inc.Methods and apparatus for expanding a tubular within another tubular
US7004257Nov 29, 2004Feb 28, 2006Weatherford/Lamb, IncApparatus and methods for separating and joining tubulars in a wellbore
US20050077046 *Nov 29, 2004Apr 14, 2005Weatherford/Lamb, Inc.Apparatus and methods for separating and joining tubulars in a wellbore
Classifications
U.S. Classification175/267, 175/335, 175/288, 175/346
International ClassificationE21B10/34, E21B10/26
Cooperative ClassificationE21B10/34
European ClassificationE21B10/34