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Publication numberUS2782850 A
Publication typeGrant
Publication dateFeb 26, 1957
Filing dateApr 29, 1955
Priority dateApr 29, 1955
Publication numberUS 2782850 A, US 2782850A, US-A-2782850, US2782850 A, US2782850A
InventorsCondra Elmo L
Original AssigneeCondra Elmo L
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Pipe reamer and mill
US 2782850 A
Abstract  available in
Images(1)
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Claims  available in
Description  (OCR text may contain errors)

PIPE: REAMER AND MILL.

YFiled April 29, 1955 nien United States Patent PIPE REAMER AND MILL Elmo L. Condra, Long Beach, Calif. Application April 29, 1955, Serial No. 504,891

10 Claims. (Cl. 164-0.8)

This invention relates to a pipe rearner and mill which is usedV in oil, gas or water wells for the purpose of severing pipe which may be in the well, or for the purpose of cutting what is termed a window in the pipe if it is necessary to by-pass or deflect the hole for any reason. My tool may also be used as a router or a means of completely pulverizing a section of pipe after lthat section has been severed from the main portion of the pipe.

An object of my invention is to provide a novel pipe reamer and mill which can be easily inserted in the pipe and the cutters of which can be readily moved into engagement with the pipe for the purpose of cutting or reaming the same.

Another object of my invention is to provide a novel pipe reamer and mill in which the cutters are pressed against the inside of the pipe by means of a block which is pressed against the pipe on the side opposite the cutters.

Another object of my invention is to provide a novel pipe reamer and mill in which the activating block is pressed against'the inside of the pipe by means of fluid pressure. of the well by means of thev usual slush pump.

Still another object of my invention is to'provide a novel pipe reamer and mill in which the activating block which presses the cutters against the pipe is urged outwardly by being caused to move upwardly on an inclined n showingrthe cutters in position of completely severing the pipe.

Figure 3 is a sectional view taken on line 3 3 of Figure 1. n o A i o Y Figure l'is a sectional view taken Yon line 4 4 of Figure 2.

Referring more particularly to the drawing, the nurneral 1 indicates the pipe or casing, and it is this pipe which is to be cut or severed in order that the casing or pipe might be removed from the well, or that a `section thereof mightV be completely pulverized or t gound `up Iforfthe `purpose of Vdrilling through the pipe at an angle to the center line of the casing, or for other purposes. My pipe reamer and mill is operated on drill pipe 2, all of which is usual and well known in the art.

The pipe reamer and mill consists of a coupling 3 which is threaded as shown at 4 to receive the threaded connection of the drill pipe 2. A fitting 5 is threaded This fluid pressure is exerted from the surface fice into the coupling 3 and the purpose of this iitting will be further described. A pipe section 6 is threadedonto the lower end of the fitting 5 and this pipe section forms a cylinder for the fluid actuated mechanism, as Will be further described. A mandrel 7 is threaded onto the lower end of the pipe or cylinder 6, and this mandrel has cutting or reaming teeth 8 projecting from one side thereof. An opening or window 9 is provided through the wall of the mandrel 7 on the side opposite the teeth S. An activating block 10 is positioned within the mandrel 7 and is adapted to move vertically Within the mandrel and to be projected through the window 9. The block 10 is slidably mounted on a n inclined rod 11 and this rod is fixedly attached within the mandrel 7 so that the block 10 will be moved outwardly through the window 9 as the block moves upwardly on this rod.

A piston 12 is mounted within the cylinder 6 and moves upwardly in this cylinder` under fluid pressure, as will be further described. A tube 13 rises from the piston 12 and extends through the fitting 5. Suitable packing 14 in the fitting S surrounds the tube 13 and prevents fluid from leaking around the outside of this tube. A plurality of outlet ports 15 are provided in the piston and the ports communicate with the tube 13. Thus fluid under pressure from the drill pipe 2 can iiow downwardly through the tube 13 and out through the ports 1S to expand the cup 16 of the piston, and thus exert its pressure below the piston. A restricted orifice 17 at the upper end of the mandrel 7 restricts the tlow of fluid therethrough, creating an upward pressure in the cylinder 6 and below the piston 12, thus urging the piston upwardly in the cylinder. A cable or other iiexible connection 18 is attached at one end to the block .itl and at the other end to the piston 12. This cable extends through the orifice or port 17 thus further restricting this orice. A fluid outlet hole 19 is provided -in the bottom of the mandrel 7 so that circulating fluid can pass out of the tool at this point. A bleed holeV 2i) is provided in the fitting 5 so that any fluid which might accumulate above the piston 12 can readily surge in l and out of the space above the piston without hindering the movement thereof. Y

In operation my pipe reamer and mill is lowered into the casing 1 to the point desired. When this point is reached fluid from the slush pump is forced into the drill pipe 2 and this fluid passes downwardly through the drill pipe, thence through the tube 13 out through the ports 15 and is restricted in its further downward flow by the orifice 17. The restriction at 17 thus creates an upward pressure against the bottom of the piston 12 urging the piston upwardly in the cylinder 6. An upward pull on the cable 18 now moves the block 10 upwardly on the inclined rod 11. The block 10 moves out through the window 9 and presses against the inside of the casing l, thus pressing the cutters 8 on the opposite side of the mandrel 7 against the inside of the casing 1. Rota* tion of the drill pipe 2 will now cause the cutters S to cut or sever the casing 1. A continued upward pressure is exerted on the block 1i), thus continuously pressing the cutters 8 into the casing 1 until the casing is entirely severed. The amount of pressure which is Y exerted on the teeth 8 to press them against the casing 1 can be changed as required by changing the iluid pressure of the slush pump.

Having described my invention, I claim:

1. A pipe rearner and mill comprising a coupling adapted to be attached to a drill pipe, a cylinder below the coupling, means connecting the cylinder and the coupling, a piston in said cylinder, a tube rising from the piston and extending through said means, said tube being open at the top and the bottom thereof, the bottom open ing below the piston, a mandrel attached to the cylinder,

cutters onmone side ofthe mandrel, a block, said mandrel having a window therein through which 'said block may move, means mounting said block on the mandrel for vertical and lateralmovement in said window, and means connecting said rblock and the piston. p

2. kA pipe reamer and 'mill comprisingy a coupling adapted to be attached to a drill pipe, a cylinder below .the coupling, meansconnecting the cylinder and the -coupling, a piston in said cylinder, a tube risingfrom the piston and extending'through said means, said tube being open at the top and the bottom thereof, the bottom opening below the piston, a mandrel, attached to the cylinder, cutters on one side of the mandrel, a block, said mandrel havingva window therein through which said block may move, means mounting said block on the mandrel for vertical and lateral movementin said window, and means connecting said blockand the piston, and a restricting oritice in the lower Vpart of the cylinder, lsaid oriiice being below the piston.

3. A -pipe reamer and mill comprising a coupling adapted to be attached to a drill pipe, a cylinder below the coupling, means connecting the cylinder and the coupling, a piston in said cylinder, a tube rising from the piston and extending through said means, said tube being ropen at the top and the bottom thereof, the bottom opening below the piston, a mandrel, attached to the cylinder, cutters on one side of the mandrel, a block, said mandrel having a window therein through which said block may move., an inclined rod positioned within the mandrel, said block being slidably mounted on the rod for vertical and lateral movement in said window, and means connecting said block and thepiston.

4. A pipe reamer and mill comprising a coupling adapted to be attached to a drill pipe, a cylinder below the coupling, means connecting the cylinder and the coupling, a piston in said cylinder, a tube rising from the piston and extending through said means, said tube being open at the top and the bottom thereof, the bottom opening below the piston, a mandrel attached to the cylinder, cutters on one side of the -mandrel, a block, said mandrel-having a window therein through which said block may move, means mounting said block on the mandrel r`for vertical and Vlateral movement in said window, a cable attached at oneend to the block and at vthe other end to the piston.

5. A pipe reamer and mill comprising a coupling.

adapted to be'attached to a drill pipe, a cylinder below the coupling, means connecting the cylinder and thecoupling, va piston in said cylinder, a tube vrising from thepiston and extending through said means, said tube being open at the top and the bottom thereof, the bottom opening below the piston, a mandrel attached to the cylinder, cutters on one side of the mandrel, a block, said mandrel having a window therein through 'which said yblock 'may move, an inclined `rod positioned within the mandrel, said block being slidably mounted on the rod for vertical and lateral movement in said window, and means connecting said block and the piston, and a restricting oriice in thelower part of the cylinder, said orice being below the piston.

6. A pipe reamer and mill comprising a coupling adapted to be attached to a drill pipe, a cylinder below the coupling, means connecting the cylinder andthe coupling, a piston in said cylinder, a tube rising from the piston and extending through'said means, said tube'being open 'at the top and the bottom thereof, the bottom opening below the piston, a mandrel attached to the cylinder, cutters `on one side of the mandrel, a block, said mandrel having a window therein through which said Ablock 'may move, means mounting said block on the 'mandrel for 4 vertical and lateral movement in said window, a cable lattached at 'one to 'the block 'and at the 'other e'nd t'o` the piston, and a restricting'oritice in the lower part of the cylinder, said oriiice being below the piston.

7. A pipe reamer and mill comprising a coupling adapted to be attached to drill pipe, a cylinder below the coupling, a itting connecting the cylinder and the coupling, a piston in said cylinder, a tube rising from the piston and extendingnthrough said .fitting packing means in the fitting around the tube, said tube being open at the top and bottom thereof, the `bottom opening being below the piston, a mandrel below and .attached to said cylinder, cutters on one side of the mandrel, a block, said mandrel having a window 'therein through which said block may move, means mounting said block in the mandrel for vertical and lateral movement in said window, and means connecting said block and the piston.

8. A pipe reamer and mill comprising a coupling adapted to be attached to drill pipe, a cylinder below the coupling, a titting connecting vthe cylinder and the coupling, -a piston in said cylinder, a tube rising from the piston V,and extending through said fitting, packing means in the iitting around `the tube, said tube being open at the top and .bottom thereof, the .bottom opening being below the piston, a mandrel below and attached to said cylinder, cutters on one side of the mandrel, a block, said mandrel having a window therein through which said block may move, an inclined rod in the mandrel, said block being slidable on the rod for lvertical and lateral movement in said window, and means connecting said block and the piston.

9. A pipe reamer and mill comprising a coupling adapted to b efattached toldrill pipe, a cylinder below the coupling, a fitting connecting the cylinder andthe coupling, a -piston 'in .said cylinder, a tube rising from the piston and extending through said tting, packing means in the fitting around thetube, said tube .being openat the top and bottom thereof, the bottom opening being below the piston, a mandrel belowrand attached to said cylinder, cutters on one sidef the mandrel, a block, said mandrel having a vwindow .therein vthrough which said vblock may move, means mounting said block -in the mandrel for vertical and lateral lmovement in said window, and a cable connecting `said lblock and the piston.

l0. `A pipe reamer and mill comprising a coupling adapted to be attached to drill pipe, a .cylinder below the coupling, 'a fitting connecting the cylinder and the coupling, a piston in said cylinder, a tube rising from the pistonl and extending through said fitting, packing means in ,the fitting around the tube, said tube being open at the top and bottom thereof, the bottom opening being below the piston, a mandrel below and "attached to said cylinder, `cutters on one `side of the mandrel, a block, said mandrel having a window therein through which said block may move,'mea ns mounting said block in the mandrel for vertical and lateral .movement in said window, and a cable connecting said block and the piston, and a restricting orifice in the lower part of the cylinder, said orifice being below the piston.

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US1805515 *Jul 18, 1930May 19, 1931Denney Harvey JInside pipe cutter
US1913636 *Mar 30, 1928Jun 13, 1933James S AbercrombieUniform pressure casing cutter
US2078401 *Aug 20, 1934Apr 27, 1937Thomas Mccann NealCasing cutter
US2136518 *Sep 19, 1936Nov 15, 1938Joe NixonPipe cutter
US2622679 *Oct 8, 1948Dec 23, 1952Ransom Russell AInside pipe cutter
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US6581690 *Oct 30, 2001Jun 24, 2003Rotech Holdings, LimitedWindow cutting tool for well casing
Classifications
U.S. Classification166/55.8
International ClassificationE21B29/00, E21B29/06
Cooperative ClassificationE21B29/06
European ClassificationE21B29/06