CA1082685A - Drilling bit with a single cutting head - Google Patents
Drilling bit with a single cutting headInfo
- Publication number
- CA1082685A CA1082685A CA291,544A CA291544A CA1082685A CA 1082685 A CA1082685 A CA 1082685A CA 291544 A CA291544 A CA 291544A CA 1082685 A CA1082685 A CA 1082685A
- Authority
- CA
- Canada
- Prior art keywords
- drill bit
- drill
- conical head
- head portion
- bearings
- 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
Links
- 238000005520 cutting process Methods 0.000 title claims abstract description 35
- 238000005553 drilling Methods 0.000 title claims abstract description 28
- 239000012530 fluid Substances 0.000 claims abstract description 12
- 239000007787 solid Substances 0.000 claims abstract description 5
- 238000005096 rolling process Methods 0.000 claims description 13
- 239000003381 stabilizer Substances 0.000 claims description 5
- 230000008878 coupling Effects 0.000 claims 1
- 238000010168 coupling process Methods 0.000 claims 1
- 238000005859 coupling reaction Methods 0.000 claims 1
- 230000000087 stabilizing effect Effects 0.000 claims 1
- 238000005461 lubrication Methods 0.000 abstract 1
- 230000015572 biosynthetic process Effects 0.000 description 10
- 238000005755 formation reaction Methods 0.000 description 10
- 230000007246 mechanism Effects 0.000 description 8
- 230000008859 change Effects 0.000 description 5
- 239000000314 lubricant Substances 0.000 description 5
- 239000000463 material Substances 0.000 description 4
- UONOETXJSWQNOL-UHFFFAOYSA-N tungsten carbide Chemical compound [W+]#[C-] UONOETXJSWQNOL-UHFFFAOYSA-N 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000007790 scraping Methods 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000004519 grease Substances 0.000 description 2
- 230000000284 resting effect Effects 0.000 description 2
- 239000011435 rock Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 239000011324 bead Substances 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 229910003460 diamond Inorganic materials 0.000 description 1
- 239000010432 diamond Substances 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 239000010438 granite Substances 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B10/00—Drill bits
- E21B10/08—Roller bits
- E21B10/083—Roller bits with longitudinal axis, e.g. wobbling or nutating roller bit
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B10/00—Drill bits
- E21B10/08—Roller bits
- E21B10/18—Roller bits characterised by conduits or nozzles for drilling fluids
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B10/00—Drill bits
- E21B10/08—Roller bits
- E21B10/20—Roller bits characterised by detachable or adjustable parts, e.g. legs or axles
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B10/00—Drill bits
- E21B10/08—Roller bits
- E21B10/22—Roller bits characterised by bearing, lubrication or sealing details
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B10/00—Drill bits
- E21B10/46—Drill bits characterised by wear resisting parts, e.g. diamond inserts
- E21B10/50—Drill bits characterised by wear resisting parts, e.g. diamond inserts the bit being of roller type
- E21B10/52—Drill bits characterised by wear resisting parts, e.g. diamond inserts the bit being of roller type with chisel- or button-type inserts
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Earth Drilling (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
A rotary drill bit for drilling a well in the surface of the earth the --drill bit comprising a drill bit body including an upper portion for connection to a drill string, duct means for carrying fluid to extract detritus and clear the bottom of the well and receiving means; a solid cutting head comprising a conical head portion and a stem portion, the conical head portion including holes therein and cutting elements inserted in the holes, the stem portion --being received in the receiving means of the drill bit body, wherein the stem and the receiving means include holding means for rotatably holding the - -cutting head in the drill bit body; bearing means between the drill bit body -and the conical head; and a lubrication system interconnected between the -drill bit body and the cutting head.
A rotary drill bit for drilling a well in the surface of the earth the --drill bit comprising a drill bit body including an upper portion for connection to a drill string, duct means for carrying fluid to extract detritus and clear the bottom of the well and receiving means; a solid cutting head comprising a conical head portion and a stem portion, the conical head portion including holes therein and cutting elements inserted in the holes, the stem portion --being received in the receiving means of the drill bit body, wherein the stem and the receiving means include holding means for rotatably holding the - -cutting head in the drill bit body; bearing means between the drill bit body -and the conical head; and a lubrication system interconnected between the -drill bit body and the cutting head.
Description
, ' .
BACKGROUND OF TEIE INVENTION
The present invention relates to a rotary drilling bit for well drilling:.
and more particularly is related to a new tool to be used with the rotatory -drilling method, which presents remarkable differences and advantages over the conventional drilling tools and drills heretofore used.
To provide an idea about the differences and advantages of this new --tool, it is considered necessary to describe briefly the drilling bits of the rotatory type which exist in the market. . I
At present the bits are separated In two big groups, the flrst one - - ~ .
iC: comprising all of those bits which do not have any movable part, which are -made from one piece and rotate in an integral form~. This type predomin~ntly scrap or drag the bottom of the well such as the so called "flsh tail" bits, - ,.. ~
wing bits, and diamond bits. With these types the drilling is performed by - ~
-- . . . - . , . - .. - ~ . j, .. . . . . . ..
108~85 2.
the rotation and by the application of a determinate weight on the bit such a -manner that the bottom of the well is scraped, and the detritus are drawn into the surface by the circulation of the drilling fluid. These bits are very rarely used at present time, except in very special instances due to the limitations thereof, specially with regard to the drilling of hard formations, principally massive rocks.
The second group relates to bits which havè rotating or rollirig elements in their lower part; these rolling elements are principally cones with strias -or teeth which roll in the bottom of the well by the application of the weight on 1~) th~ bit, the rolling resulting in the crushing of the rock. The crushed formation is drawn into the surface by the circulation of the drilling fluid. The rolling - `
elements in the actual bits always are in a variable number, the more ordinary being those which comprise three cones integrated in only one piece and which can not be disassembled or taken apart and therefore can not be repaired. In fact the triconical bits are built by manufacturing separately each one of the -three cones and its corresponding leg provided with bearings and seals which are individually built, that is each one of the legs is separately built. Then -during the manufacturing these three parts are bond by welding, forming a --single unit. The bit undergoes a wearing of the teeth of the cones, of the cones themselves, of the seals and of the bearings, and thus after of a certain time, when the failure or the wear of some of these constructive elements occurs,-the bit will be totally useless, without the possibility of repairing, th0 result is a large waste of material and work which never can be recuperated. Once some of its elements fail the bit is totally discarded without the possibility of recuperation. Another variation of this ty~e of bit is the so called cross bit which comprises four tooth rollers, ¢ones or rolls arranged in a such manner that two of the rollers are placed along one of the diameter~, but without - o totally cutting th~ full diameter, only the central part, and the o~her two - -_ ~3268S 3- ~
rollers are placed at 90 and cut the circumferential part of the well to be --drilled. Sometimes these tools were able to be repaired but with a considera ble cost, and its efficiency is limited, thus it is very rarely used.
There is another~ group of drilling bits, known as differential or - -Zublin bits. These bits are of the single cutting head type, reparable and --replaceable, which are up to now practically obsolete because of their poor -efficiency and limited use. In fact these bits perform like drag bits because the motion of the cutting heads is rather a wobbling motion instead of a true rolling mechanism. The Zublin simplex bit which has an almost spherical -cutting head rotat ing in an inclined angle of 30 degrees from the vertical -produces a scraping and reaming action in an up and down motion combined -with some rotation.
SUMMARY OF THE INVENTION
The characteristics of this new invention consist in that instead of -being provided with several cutting rollers or cones, it is built in a such - -manner that a single cutting head is ùsed, but with a true and perfect rolling motion against the bottom of the hole with a crushing milling and grinding -action thereby enabling it to drill through any kind of formation including very hard roeks. Besides, this cutting head can be easily dismounted from the body of the bit in order to change the constructive elements, such as seals,-... .
bearings and the cutter itself, so that the bit body which involves a eonsiderableamount of material and work, can be used practically in an indefinite form, -simply changing the constructive elements above mentioned such as the cutting G~ ' .- , . : , ; ~
10826~3S
head, bearings and seals. Also dif~eren~ cutting heads with different characteristics can be used to drill appropriately formations with different hardness and characteristics.
Thus the present invention provides a rotary drill for drilling a well in the surface of the earth, said drill comprising:
(a) a drill bit including an upper portion for connection to a drill string, duct means including a fluid outlet into the well for carrying fluid to extract detritus and clean the bottom of the well, and means for receiving and retaining a solid cutting head within the drill bit;
(b) said solid cu~ting head comprising a conical head por-tion and a unitar~ stem portion with no internal passages therein, said conical head portion including holes therein and cutting elements inserted in said holes, said stem portion being received in said drill bit, wherein said stem portion and said drill bit comprise the retaining means for rotatably holding said cutting head in said drill bit;
~ c) sealed, lubricated bearing means between said drill bit and said conical head portion, said bearing means being fixed relative to said drill bit and to said conical head portion for preventin~ movement between bearing surfaces of the bearing means which c~ontact the drill bit and the conical head portion, but allowing said conical head portion to rotate relative to said drill bit; said bearing means being independent of said duct means;
and (d) stabilizer means for equalizing the pressure in the bearin~ means with the pressure in a bore hole surrounding the drill bit.
~ -3a-~.
, ' , : ' . ' : :
. - : .
. . .
~8Z6BS
Therefore, th~s ne~ tool involves a considerable advance in the decreasing of the drilling costs, since it i9 a tool which can ~e used practIcally -3~ :
'' j`-~,` t . . .
'- : .. . ~ , .' ' `,, ' ., :
. '` ' " . ,: ' ' ,' , : ,"; -' ' ' ', ' ," ' ~ "' ' ' ` ,' , ,.' ' ' ' ' .:' '. ." ' . ' , ','' ,.' .' . ',.. .
~08Z~;85 4 in an indefinite form, changing the constructive elements as the wear is observed, with ~t being possible to change the rolling devices hereinafter described, and to change of the cutting head itself using the same body, -which in case of necessity can be repaired, readjusted and reused.
BRIEF DESCRIPTION OF THE DRAWINGS
For a better understanding of the performing and building of the new tool, attached are drawings in which:
Figure 1 is a side view of the present invention.
Figure 2 is a sectional side view showing the present invention.
Figure 3 is a sectional view of the drill bit body of the present -invention .
Figure 4a is a bottom view of the cutting head of the present - -invention .
Figure 4b and 4c are sectional views of the cutting head of the -present invention.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
Figure 1 represents a side view of the full piece.
The drill bit body represented with number 1, is a single piece and its - -inner construction will be shown in the following figures. The piece number ~0 2 represents the cutting head formed by a cone with certain characteristics-that will be described hereinafter, and which penetration or cutting elements of the ~ormation are comprised by teeth represellted by the number 3.
The tungsten carbide beads representecl with the number 4, are - -necessary parts whrch avoid the cutting head loss material decreasing its -diameter as a result of the friction against the well walls. The portion - -designed in number 5, represents a square or plane on both sides of the bit body in order to allow its twist through a special key to th~ rest of the - -drilling column to which it is fas~ened by the conical threads number 6.
In the figure 2 is illustrated a cross section o~ the entire tool ~nd -1~2685 its components parts. The cutting head 2 is formed by a cone which has a very wide vertex, forming an angle represented with the letter A. In the particular case of the drawing, this angle A is 155, but of course it can vary according to the design and with the drilling of the distinct formations. This cone also hElS a stem or large shaft illustrated with the number 7 in a such manner that the axis of this cone and its stem represented by the lettersF-F, makes an -angle with the tools axis represented with the letters E-E. This angle is - -sho~vn in the drawing with the letter D, and this angle is equal to that formed by the plane of the cone and the horizontal line of the well bottom illustrated -la with the letter C, The working of the tool is as follows: upon the rotation of the bit body~onnect~d to the drilling column 1, acting through the bearing devices and the shaft of the cutting head or cone 2 to carry out its rolling in the well bottom on generatrixes o~ this wide cone, in a successive form in a such manner that upon completion of a turn of the body 1, the cone will have carried out its - -rolling, resting successively its generatrix on the bottom of the well completing a little more of a turn since the diarneter of the cone is slightly less than the diameter of the hole. In this manner is possible to observe that there is not -a scraping or sliding effect between the cone and the well bottom although a -~a perfect rolling is produced since both the cone axis and the body axis just - -coincide in the cone verte~, Obviously this arrangement which is illustrated -in the drawing can be modified forcing a slight displacement of the cone axis '~
into any side, in a manner such that in addition to the rolling, a sliding is - -produced and, therefore, the drilling is produced both by crush~ng through a- ' true rolling and by a sliding or scraping of the bottom of the well it being - -possible modify the design to produce the desired effects.
It can be observed that the cone and its stem or shaft is locked in - -place through tne steel balls device represented with the number 8. This device really forms a hold means or a rotar~ lock which is obtained by means of a --A
.... . . . ~ . `, ....................... . .................... .
. . .
- ~)8~6~5 slot with an semi-circular groove in the stem and an~Lher semi-circular -groove in the bit body taking into account the necessary mechanical lolerances.
The steel balls or bullets are introduced through the orifice shown, and -then it is closed or sealed by means o~ a screw 13 and the check nl~t 14 so that by means of this arrangement the bullets can be withdrawn, and the -cone and the other bearings which will be described hereinafter can be - -withdrawn ~or change, readjustment or repair, according to the drilling -necessities .
The loads which act on the mechanism by the drilling action will-be absorbed or transmitted by means of the roller bearings 9 and 10. Roller bearing 9 absorbs the excentric stresses or moments, or the radial loads, and thrust bearing 10 absorbs the loads and the stress which are axially -produced in the action line of the cone axis and its stem ilustrated in the -dra~ving with the FF line.
Th~se Thi~ roller bearings both radial and axial that is 9 and 10 respec tively remain assembled and adjusted by means of the thick washer or - -~lange ll, which transmits at same time the axial forces to the thrust - -roller bearing lO and adjust the exact position o~ the roller 9 to fasten it against the upper face of the work cone 2.
It should be noted that the arrangement of these roller bearings -can be changed in order to accommodate like roller or ball bearings from several manufacturers of thesè mechanisms and it also should be noted --tllat in lieu of these roller bearings of the roll type, journal bearings (rriction or ~luid film bearings) can be used without changing the basic performance o~ this tool. This mechanical arrangement is always lubricated, and the --lubricant is contained within the internal mechanism spaces retained by the double annular seal 12 wherein a slipping o~ the flat race against the body -is produced, resting exactly on the seals 12 avoiding that the grease leaks to the exterior. At the same time the drilling fluid with the sandy detritus . .
~C~82685 7' o~ the crushed material is prevented from penetrating and damaging the -internal lubricated mechanism.
The lubricant necessary ~or the mechanism is supplied through the duct 15 and the duct 17 by means of the grease cup 16 so that all the spaces o~ the mechanism are filled with the proper lubricant.
The device 18 represents a very useful fitting which is not the - -subject of this patent and properly is a diaphragm through which the stabi-lization of the internal pressure of the lubricant is obtained. The changes of external pressure when the bit is introduced into the hole or is withdrawn therefrom are balanced by means o~ this diaphragm and the pressure that -th~ drilling fluid exérts in the interstice 25 such as on equalizing both in the points 25 and 24, the lubricant can not be exhausted and the drilling fluid -can not go into the internal mechanisms of the bit. For the disposal of the detritus from the formation or the cuttings produced by the teeth the nozzle 19 is used which is formed by a tungsten carbide piece fastened to the drill bit body by means of the nut 20 which seals against the drill bit body through the gasket 21. The drilling ~luid is transmited through the drill string by -the duct 23 and the duct 22 of the nozzle, which at high pressure exhausts-a jet between the hole wall and the raised part of the cone No. 2 with said ~n wall producing the necessary turbulence to withdraw the detritus and clean the well bottom so as the cone teeth of the cutting head always impinge on the clean formation., Figure 3 is a longitudinal section view of the external parts wherein the cutting head is eliminated and is shown with great detail the housing 29 for said cutting head 2. Likewise in the middle portion of the upper region of said housing 29, is illustrated the external surface of the channel 26 ~
wherein are housed the rolling balls with the access hole closed by the --nut 13 and check nut 14.
Although in this ~igure the greased cup head 16 is not illustrated, .. , -, ..
~8~ 35 ~-the lubricator ducts 15 and 17 are shc>wn with duct 17 c~?ntacting the housing 29 for the head, and the diaphragm pressure stabilizer 30.
In the upper central portion of the bit body is large duct 23 which -communicates laterally with the duct 22 in the bottom portion of which is the nut 20 and the ~asket 21.
;i3Figure~shows the cutting head 2 but the tungsten carbide inserts are not illustrated, being represented only the holes or perforations 31 in which this tungsten carbide teeth will be placed. The arrangement of these inserts can be variable of course in spacing, position etc. Thus it will be la possible to conform the end of the bit for drilling of several types of forma tions. The emerged portion of the teeth could be larger or shorter, also its spaci~g in a different forrn according to the requirements of the drilling of the several formations such as the drilling of sand, granite or clay. Of course, L
the free elements described in the manufacture of this drill, allow the making of all of the variations necessary for the better working o~ the piece, according with the formations to be drilled, and therefore the advantage which comprises the ability to change several cutting heads with different teeth arrangements to obtain precissely the end intended, without the necessity of changing the -entire bit as is the case in the prior art.
~"
:~ :
BACKGROUND OF TEIE INVENTION
The present invention relates to a rotary drilling bit for well drilling:.
and more particularly is related to a new tool to be used with the rotatory -drilling method, which presents remarkable differences and advantages over the conventional drilling tools and drills heretofore used.
To provide an idea about the differences and advantages of this new --tool, it is considered necessary to describe briefly the drilling bits of the rotatory type which exist in the market. . I
At present the bits are separated In two big groups, the flrst one - - ~ .
iC: comprising all of those bits which do not have any movable part, which are -made from one piece and rotate in an integral form~. This type predomin~ntly scrap or drag the bottom of the well such as the so called "flsh tail" bits, - ,.. ~
wing bits, and diamond bits. With these types the drilling is performed by - ~
-- . . . - . , . - .. - ~ . j, .. . . . . . ..
108~85 2.
the rotation and by the application of a determinate weight on the bit such a -manner that the bottom of the well is scraped, and the detritus are drawn into the surface by the circulation of the drilling fluid. These bits are very rarely used at present time, except in very special instances due to the limitations thereof, specially with regard to the drilling of hard formations, principally massive rocks.
The second group relates to bits which havè rotating or rollirig elements in their lower part; these rolling elements are principally cones with strias -or teeth which roll in the bottom of the well by the application of the weight on 1~) th~ bit, the rolling resulting in the crushing of the rock. The crushed formation is drawn into the surface by the circulation of the drilling fluid. The rolling - `
elements in the actual bits always are in a variable number, the more ordinary being those which comprise three cones integrated in only one piece and which can not be disassembled or taken apart and therefore can not be repaired. In fact the triconical bits are built by manufacturing separately each one of the -three cones and its corresponding leg provided with bearings and seals which are individually built, that is each one of the legs is separately built. Then -during the manufacturing these three parts are bond by welding, forming a --single unit. The bit undergoes a wearing of the teeth of the cones, of the cones themselves, of the seals and of the bearings, and thus after of a certain time, when the failure or the wear of some of these constructive elements occurs,-the bit will be totally useless, without the possibility of repairing, th0 result is a large waste of material and work which never can be recuperated. Once some of its elements fail the bit is totally discarded without the possibility of recuperation. Another variation of this ty~e of bit is the so called cross bit which comprises four tooth rollers, ¢ones or rolls arranged in a such manner that two of the rollers are placed along one of the diameter~, but without - o totally cutting th~ full diameter, only the central part, and the o~her two - -_ ~3268S 3- ~
rollers are placed at 90 and cut the circumferential part of the well to be --drilled. Sometimes these tools were able to be repaired but with a considera ble cost, and its efficiency is limited, thus it is very rarely used.
There is another~ group of drilling bits, known as differential or - -Zublin bits. These bits are of the single cutting head type, reparable and --replaceable, which are up to now practically obsolete because of their poor -efficiency and limited use. In fact these bits perform like drag bits because the motion of the cutting heads is rather a wobbling motion instead of a true rolling mechanism. The Zublin simplex bit which has an almost spherical -cutting head rotat ing in an inclined angle of 30 degrees from the vertical -produces a scraping and reaming action in an up and down motion combined -with some rotation.
SUMMARY OF THE INVENTION
The characteristics of this new invention consist in that instead of -being provided with several cutting rollers or cones, it is built in a such - -manner that a single cutting head is ùsed, but with a true and perfect rolling motion against the bottom of the hole with a crushing milling and grinding -action thereby enabling it to drill through any kind of formation including very hard roeks. Besides, this cutting head can be easily dismounted from the body of the bit in order to change the constructive elements, such as seals,-... .
bearings and the cutter itself, so that the bit body which involves a eonsiderableamount of material and work, can be used practically in an indefinite form, -simply changing the constructive elements above mentioned such as the cutting G~ ' .- , . : , ; ~
10826~3S
head, bearings and seals. Also dif~eren~ cutting heads with different characteristics can be used to drill appropriately formations with different hardness and characteristics.
Thus the present invention provides a rotary drill for drilling a well in the surface of the earth, said drill comprising:
(a) a drill bit including an upper portion for connection to a drill string, duct means including a fluid outlet into the well for carrying fluid to extract detritus and clean the bottom of the well, and means for receiving and retaining a solid cutting head within the drill bit;
(b) said solid cu~ting head comprising a conical head por-tion and a unitar~ stem portion with no internal passages therein, said conical head portion including holes therein and cutting elements inserted in said holes, said stem portion being received in said drill bit, wherein said stem portion and said drill bit comprise the retaining means for rotatably holding said cutting head in said drill bit;
~ c) sealed, lubricated bearing means between said drill bit and said conical head portion, said bearing means being fixed relative to said drill bit and to said conical head portion for preventin~ movement between bearing surfaces of the bearing means which c~ontact the drill bit and the conical head portion, but allowing said conical head portion to rotate relative to said drill bit; said bearing means being independent of said duct means;
and (d) stabilizer means for equalizing the pressure in the bearin~ means with the pressure in a bore hole surrounding the drill bit.
~ -3a-~.
, ' , : ' . ' : :
. - : .
. . .
~8Z6BS
Therefore, th~s ne~ tool involves a considerable advance in the decreasing of the drilling costs, since it i9 a tool which can ~e used practIcally -3~ :
'' j`-~,` t . . .
'- : .. . ~ , .' ' `,, ' ., :
. '` ' " . ,: ' ' ,' , : ,"; -' ' ' ', ' ," ' ~ "' ' ' ` ,' , ,.' ' ' ' ' .:' '. ." ' . ' , ','' ,.' .' . ',.. .
~08Z~;85 4 in an indefinite form, changing the constructive elements as the wear is observed, with ~t being possible to change the rolling devices hereinafter described, and to change of the cutting head itself using the same body, -which in case of necessity can be repaired, readjusted and reused.
BRIEF DESCRIPTION OF THE DRAWINGS
For a better understanding of the performing and building of the new tool, attached are drawings in which:
Figure 1 is a side view of the present invention.
Figure 2 is a sectional side view showing the present invention.
Figure 3 is a sectional view of the drill bit body of the present -invention .
Figure 4a is a bottom view of the cutting head of the present - -invention .
Figure 4b and 4c are sectional views of the cutting head of the -present invention.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
Figure 1 represents a side view of the full piece.
The drill bit body represented with number 1, is a single piece and its - -inner construction will be shown in the following figures. The piece number ~0 2 represents the cutting head formed by a cone with certain characteristics-that will be described hereinafter, and which penetration or cutting elements of the ~ormation are comprised by teeth represellted by the number 3.
The tungsten carbide beads representecl with the number 4, are - -necessary parts whrch avoid the cutting head loss material decreasing its -diameter as a result of the friction against the well walls. The portion - -designed in number 5, represents a square or plane on both sides of the bit body in order to allow its twist through a special key to th~ rest of the - -drilling column to which it is fas~ened by the conical threads number 6.
In the figure 2 is illustrated a cross section o~ the entire tool ~nd -1~2685 its components parts. The cutting head 2 is formed by a cone which has a very wide vertex, forming an angle represented with the letter A. In the particular case of the drawing, this angle A is 155, but of course it can vary according to the design and with the drilling of the distinct formations. This cone also hElS a stem or large shaft illustrated with the number 7 in a such manner that the axis of this cone and its stem represented by the lettersF-F, makes an -angle with the tools axis represented with the letters E-E. This angle is - -sho~vn in the drawing with the letter D, and this angle is equal to that formed by the plane of the cone and the horizontal line of the well bottom illustrated -la with the letter C, The working of the tool is as follows: upon the rotation of the bit body~onnect~d to the drilling column 1, acting through the bearing devices and the shaft of the cutting head or cone 2 to carry out its rolling in the well bottom on generatrixes o~ this wide cone, in a successive form in a such manner that upon completion of a turn of the body 1, the cone will have carried out its - -rolling, resting successively its generatrix on the bottom of the well completing a little more of a turn since the diarneter of the cone is slightly less than the diameter of the hole. In this manner is possible to observe that there is not -a scraping or sliding effect between the cone and the well bottom although a -~a perfect rolling is produced since both the cone axis and the body axis just - -coincide in the cone verte~, Obviously this arrangement which is illustrated -in the drawing can be modified forcing a slight displacement of the cone axis '~
into any side, in a manner such that in addition to the rolling, a sliding is - -produced and, therefore, the drilling is produced both by crush~ng through a- ' true rolling and by a sliding or scraping of the bottom of the well it being - -possible modify the design to produce the desired effects.
It can be observed that the cone and its stem or shaft is locked in - -place through tne steel balls device represented with the number 8. This device really forms a hold means or a rotar~ lock which is obtained by means of a --A
.... . . . ~ . `, ....................... . .................... .
. . .
- ~)8~6~5 slot with an semi-circular groove in the stem and an~Lher semi-circular -groove in the bit body taking into account the necessary mechanical lolerances.
The steel balls or bullets are introduced through the orifice shown, and -then it is closed or sealed by means o~ a screw 13 and the check nl~t 14 so that by means of this arrangement the bullets can be withdrawn, and the -cone and the other bearings which will be described hereinafter can be - -withdrawn ~or change, readjustment or repair, according to the drilling -necessities .
The loads which act on the mechanism by the drilling action will-be absorbed or transmitted by means of the roller bearings 9 and 10. Roller bearing 9 absorbs the excentric stresses or moments, or the radial loads, and thrust bearing 10 absorbs the loads and the stress which are axially -produced in the action line of the cone axis and its stem ilustrated in the -dra~ving with the FF line.
Th~se Thi~ roller bearings both radial and axial that is 9 and 10 respec tively remain assembled and adjusted by means of the thick washer or - -~lange ll, which transmits at same time the axial forces to the thrust - -roller bearing lO and adjust the exact position o~ the roller 9 to fasten it against the upper face of the work cone 2.
It should be noted that the arrangement of these roller bearings -can be changed in order to accommodate like roller or ball bearings from several manufacturers of thesè mechanisms and it also should be noted --tllat in lieu of these roller bearings of the roll type, journal bearings (rriction or ~luid film bearings) can be used without changing the basic performance o~ this tool. This mechanical arrangement is always lubricated, and the --lubricant is contained within the internal mechanism spaces retained by the double annular seal 12 wherein a slipping o~ the flat race against the body -is produced, resting exactly on the seals 12 avoiding that the grease leaks to the exterior. At the same time the drilling fluid with the sandy detritus . .
~C~82685 7' o~ the crushed material is prevented from penetrating and damaging the -internal lubricated mechanism.
The lubricant necessary ~or the mechanism is supplied through the duct 15 and the duct 17 by means of the grease cup 16 so that all the spaces o~ the mechanism are filled with the proper lubricant.
The device 18 represents a very useful fitting which is not the - -subject of this patent and properly is a diaphragm through which the stabi-lization of the internal pressure of the lubricant is obtained. The changes of external pressure when the bit is introduced into the hole or is withdrawn therefrom are balanced by means o~ this diaphragm and the pressure that -th~ drilling fluid exérts in the interstice 25 such as on equalizing both in the points 25 and 24, the lubricant can not be exhausted and the drilling fluid -can not go into the internal mechanisms of the bit. For the disposal of the detritus from the formation or the cuttings produced by the teeth the nozzle 19 is used which is formed by a tungsten carbide piece fastened to the drill bit body by means of the nut 20 which seals against the drill bit body through the gasket 21. The drilling ~luid is transmited through the drill string by -the duct 23 and the duct 22 of the nozzle, which at high pressure exhausts-a jet between the hole wall and the raised part of the cone No. 2 with said ~n wall producing the necessary turbulence to withdraw the detritus and clean the well bottom so as the cone teeth of the cutting head always impinge on the clean formation., Figure 3 is a longitudinal section view of the external parts wherein the cutting head is eliminated and is shown with great detail the housing 29 for said cutting head 2. Likewise in the middle portion of the upper region of said housing 29, is illustrated the external surface of the channel 26 ~
wherein are housed the rolling balls with the access hole closed by the --nut 13 and check nut 14.
Although in this ~igure the greased cup head 16 is not illustrated, .. , -, ..
~8~ 35 ~-the lubricator ducts 15 and 17 are shc>wn with duct 17 c~?ntacting the housing 29 for the head, and the diaphragm pressure stabilizer 30.
In the upper central portion of the bit body is large duct 23 which -communicates laterally with the duct 22 in the bottom portion of which is the nut 20 and the ~asket 21.
;i3Figure~shows the cutting head 2 but the tungsten carbide inserts are not illustrated, being represented only the holes or perforations 31 in which this tungsten carbide teeth will be placed. The arrangement of these inserts can be variable of course in spacing, position etc. Thus it will be la possible to conform the end of the bit for drilling of several types of forma tions. The emerged portion of the teeth could be larger or shorter, also its spaci~g in a different forrn according to the requirements of the drilling of the several formations such as the drilling of sand, granite or clay. Of course, L
the free elements described in the manufacture of this drill, allow the making of all of the variations necessary for the better working o~ the piece, according with the formations to be drilled, and therefore the advantage which comprises the ability to change several cutting heads with different teeth arrangements to obtain precissely the end intended, without the necessity of changing the -entire bit as is the case in the prior art.
~"
:~ :
Claims (9)
IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A rotary drill for drilling a well in the surface of the earth, said drill comprising:
(a) a drill bit including an upper portion for connection to a drill string, duct means including a fluid outlet into the well for carrying fluid to extract detritus and clean the bottom of the well, and means for receiving and retaining a solid cutting head within the drill bit;
(b) said solid cutting head comprising a conical head portion and a unitary stem portion with no internal passages therein, said conical head portion including holes therein and cutting elements inserted in said holes, said stem portion being received in said drill bit, wherein said stem portion and said drill bit comprise the retaining means for rotatably holding said cutting head in said drill bit;
(c) sealed, lubricated bearing means between said drill bit and said conical head portion, said bearing means being fixed relative to said drill bit and to said conical head portion for preventing movement between bearing surfaces of the bearing means which contact the drill bit and the conical head portion, but allowing said conical head portion to rotate relative to said drill bit; said bearing means being independent of said duct means; and (d) stabilizer means for equalizing the pressure in the bearing means with the pressure in a bore hole surrounding the drill bit.
(a) a drill bit including an upper portion for connection to a drill string, duct means including a fluid outlet into the well for carrying fluid to extract detritus and clean the bottom of the well, and means for receiving and retaining a solid cutting head within the drill bit;
(b) said solid cutting head comprising a conical head portion and a unitary stem portion with no internal passages therein, said conical head portion including holes therein and cutting elements inserted in said holes, said stem portion being received in said drill bit, wherein said stem portion and said drill bit comprise the retaining means for rotatably holding said cutting head in said drill bit;
(c) sealed, lubricated bearing means between said drill bit and said conical head portion, said bearing means being fixed relative to said drill bit and to said conical head portion for preventing movement between bearing surfaces of the bearing means which contact the drill bit and the conical head portion, but allowing said conical head portion to rotate relative to said drill bit; said bearing means being independent of said duct means; and (d) stabilizer means for equalizing the pressure in the bearing means with the pressure in a bore hole surrounding the drill bit.
2. A rotary drill as set forth in claim 1 wherein said retaining means comprises a first groove in said receiving means, a second groove in said stem portion, and a plurality of linking elements positioned in said grooves.
3. A rotary drill as set forth in claim 2 wherein said linking elements are spherical.
4. A rotary drill as set forth in claim 1 wherein said stabilizer means is a pressure stabilizer diaphragm in said drill bit for stabilizing the pressure in said bearing means to prevent leakage.
5. A rotary drill as set forth in claim 1 wherein said duct means comprises a nozzle for ejecting said fluid, said nozzle being positioned within the outer diameter of said drill bit, a main central duct and a smaller duct coupling said main central duct to said nozzle.
6. A rotary drill as set forth in claim 1 wherein said bearing means includes first bearings for bearing axial loads on said conical head portion and second bearings for bearing radial loads on said conical head portion wherein the second bearings are located below the first bearings for bearing the radial loads at a point below the point where the axial loads are borne by the first bearings.
7. A rotary drill as set forth in claim 6 wherein said first and second bearnings are roller bearings.
8. A rotary drill as set forth in claim 6 wherein said first and second bearings are friction or fluid film bearings.
9. A rotary drill as set forth in claim 1 wherein the axis of said drill bit intersects the axis of said conical head portion at the vertex of the cone of said conical head portion whereby perfect rolling of the conical head portion on the bottom of the well is effected.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| MX167,153 | 1976-11-24 | ||
| MX16715376A MX143004A (en) | 1976-11-24 | 1976-11-24 | SINGLE-HEAD DRILL FOR WELL DRILLING |
| US05/800,916 US4154312A (en) | 1977-05-26 | 1977-05-26 | Drill bit with single cutting head |
| US800,916 | 1991-11-27 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1082685A true CA1082685A (en) | 1980-07-29 |
Family
ID=26641103
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA291,544A Expired CA1082685A (en) | 1976-11-24 | 1977-11-23 | Drilling bit with a single cutting head |
Country Status (7)
| Country | Link |
|---|---|
| AR (1) | AR225400A1 (en) |
| CA (1) | CA1082685A (en) |
| DE (1) | DE2751818C2 (en) |
| FR (1) | FR2372310A1 (en) |
| GB (1) | GB1557515A (en) |
| IT (1) | IT1116377B (en) |
| NL (1) | NL7712884A (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4332113A1 (en) * | 1993-09-22 | 1995-03-23 | Nlw Foerdertechnik Gmbh | Boring implement for making bores in earth with different soil classes |
| UA94503C2 (en) * | 2009-09-04 | 2011-05-10 | Ирина Григорьевна Добролюбова | Drill bit |
| US11839956B2 (en) | 2019-06-10 | 2023-12-12 | Core Tool Group, Inc. | Bit |
| CN114198032B (en) * | 2021-10-29 | 2024-06-14 | 中铁六局集团呼和浩特铁路建设有限公司 | Small-diameter drilling equipment and use method thereof |
Family Cites Families (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1238757A (en) * | 1913-02-28 | 1917-09-04 | Levi S Gardner | Rotary drill. |
| US1254267A (en) * | 1913-12-17 | 1918-01-22 | Rowland O Pickin | Drill. |
| US1334632A (en) * | 1917-06-15 | 1920-03-23 | Rowland O Pickin | Rotary rock-drill bit |
| US1747909A (en) * | 1922-05-29 | 1930-02-18 | Universal Rotary Bit Company | Rotary sectional bit |
| US1859948A (en) * | 1929-07-29 | 1932-05-24 | John A Zublin | Bit with cutters having scraping and rolling motions |
| US1914042A (en) * | 1932-03-24 | 1933-06-13 | Edwin L Rath | Double socket eccentric rock bit |
| US2124414A (en) * | 1936-04-18 | 1938-07-19 | Otto B Goldman | Well drilling bit |
| US2113820A (en) * | 1936-06-06 | 1938-04-12 | John A Zublin | Underreamer and oversize-hole drilling tool |
| US2362860A (en) * | 1941-12-22 | 1944-11-14 | Allen M Rossman | Earth boring rock bit |
| US2336335A (en) * | 1942-08-13 | 1943-12-07 | John A Zublin | Rotary hammering bit |
| US2336337A (en) * | 1942-08-13 | 1943-12-07 | John A Zublin | Heavy duty gyrating bit |
| US2598518A (en) * | 1948-04-21 | 1952-05-27 | Normand E Dufilho | Rock bit |
| US3193028A (en) * | 1962-09-26 | 1965-07-06 | Exxon Production Research Co | Rotary drill bit |
| US3299973A (en) * | 1964-07-27 | 1967-01-24 | Smith Ind International Inc | Lubrication and sealing of well drilling bit |
| US3429390A (en) * | 1967-05-19 | 1969-02-25 | Supercussion Drills Inc | Earth-drilling bits |
| US3847234A (en) * | 1972-06-01 | 1974-11-12 | Reed Tool Co | Pressure relief device for drill bit lubrication system |
| US3765495A (en) * | 1972-08-02 | 1973-10-16 | G W Murphey Ind Inc | Drill bit seals |
| US3963282A (en) * | 1975-02-13 | 1976-06-15 | Dresser Industries, Inc. | Cantilevered roller separator for rock bit bearings |
| US3966274A (en) * | 1975-02-13 | 1976-06-29 | Dresser Industries, Inc. | Roller separator for bit bearings |
-
1977
- 1977-11-19 DE DE19772751818 patent/DE2751818C2/en not_active Expired
- 1977-11-21 AR AR27004377A patent/AR225400A1/en active
- 1977-11-23 GB GB4880277A patent/GB1557515A/en not_active Expired
- 1977-11-23 NL NL7712884A patent/NL7712884A/en active Search and Examination
- 1977-11-23 CA CA291,544A patent/CA1082685A/en not_active Expired
- 1977-11-24 IT IT5192077A patent/IT1116377B/en active
- 1977-11-24 FR FR7735331A patent/FR2372310A1/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| AR225400A1 (en) | 1982-03-31 |
| DE2751818C2 (en) | 1982-08-12 |
| DE2751818A1 (en) | 1978-06-01 |
| GB1557515A (en) | 1979-12-12 |
| IT1116377B (en) | 1986-02-10 |
| NL7712884A (en) | 1978-05-26 |
| FR2372310B1 (en) | 1984-01-13 |
| FR2372310A1 (en) | 1978-06-23 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |