Патент USA US2109903код для вставки
March l, 1938. J. H. HOWARD Y 2,109,903 VALVE FOR CORE DRÍLLÈ K 'Filed Jan. 2e. _1957 Aw? Patented Mu. 1, `was 2,109,903 UNITED "STATES >Plrl'elvr OFFICE 9Claims. (CL Z55-72) ' This invention relates to weil drilling tools and relates more particularly to a valve for a core drill for use in thel rotary method of well drilling. A general object of this invention is to provide a simple, practical valve for the upper end of _the core-receiving barrel of a core drill that prevents the entrance of thick mud into the barrel whenv the tool is run into the well, and that prevents the circulation iiuid from entering the barrel during the drilling operation. 10 y ` l core drill valve that automatically closes when the fluid is circulated through the drilling string preparatory to the drilling operation and that remains closed during the drilling operation to prevent the circulation fluid from washing away the core, vbut may open to allow the escape of fluid displaced from the barrel by the entering core. - ' ` Another object of this invention is to provide K a core drill valve of the character mentioned that 10 It is usually necessary to provide a valve at is entirely automaticin'operation and that does the upper end of the core receiving barrel of a not necessitate the dropping of an object through « core drill to prevent the downwardly flowing cir culation fluid from washing away the core and that will allow the fluid to escape from the barrel as it is displaced by the core. The typical form the -drilling string and, therefore, is adapted for use in tools operated on a drilling string having of core drill valve now in general use is a simple a core drill valve of the character mentioned float valves. » 15 ' Another object of this invention is to provide embodying> novel dependable means for holding its parts properly assembled and tightly secured t0 the inner barrel. 2 20 O when the pressure in the barrel exceeds that of , ' A further object <of this invention is to provide’ the circulation fluid. _When a core drill equipped a core drill valve o_f the character mentioned that with a typical ball type check valve is run into a is'simple, and inexpensive to manufacture, in ball check valve having 'a ball that seats down wardly to prevent the entrance 'of the circulation iiuid to the barrel and` that is adapted to open well, the valve opens due to the velocity of ñuid 2 Ul iiow into the drilling string and thus allows` the well iiuid to enter the barrel. If the mud at the. bottom of the bore is very thick it enters the bar- , rel and often clogs the barrel so -that it is im possible to obtain a core. ‘Valves have been in stall and service. ' The various objects and features of my inven tion will be fully understood from. the following detailed description of a typical, preferred form ofthe invention, throughout which description lreference is made to the accompanying drawing, . . ~ . troduced embodying a ball that is dropped into ' in which: 30 O ,l the drill after the' mud, etc. has been iiushed from the barrel by waterpumped downwardly through the drilling string. Thisvdrop-ball type of valve is satisfactory in many instances but cannot be employed where ñoat valves are connected in the 3 drilling string, as such float valves prevent the ball from passing downwardly through the string to the drill. - ` - Another object of this invention is to provide a` valve for a core drill that closes when the drill .40 is run into the well and, therefore, prevents mud, etc. from entering the core barrel. Another object of this invention is to provide a valve for a core drill that may allow the light or clean fluid in the upper portion of the well to enter the barrel, but which remains closed as the drill approaches the bottom of .the well, there by preventing heavy mud in the bottom of the well from entering and clogging the barrel. ` Another object of this invention is to provide a core drill valve of the character mentioned that remains closed during the making up of the joints in the drilling string as the string is being run - '55 into the well. ' - l ` l Another object of this invention is to provide a Fig. 1 is a longitudinal detailed sectional view of a typical rotary core drill showing the improved valve of the present invention on the inner bar- . rel. Fig. 2 is a longitudinal detailed sectional view of the valve, taken substantially as indi-- 35 cated by lines 2--2 on Fig. 3 and Figs. 3 and 4 are transverse detailed sectional views taken as in dicated by lines 3-3 and li--4 on Fig. 2. The improved valve provided by this invention is adapted to be embodied in or applied to core drills of various types and makes. In the follow ing detailed disclosure I will describe one typical form'of the invention as used in connection with a more or less conventional rotary core drill. It is to be understood that the invention is not to be `construed as limited or restricted to the speciñc application of the invention illustrated in the drawing. i . ' ‘ The core drill illustrated in the drawing `includes an outer barrel l0 `to be connected with the lower end of a tubular well drilling string. A sub l I is provided on the upper end of the outer barrel I0 to facilitate its connection with the drilling string. A sub l2 is connected with the> lower end of the outer barrel I0 and» carries a 2 9,109,903 cutter head I3. The cutter head I3 is provided with cutting means for making an annular cut in the earth formation. The particular headillus trated has spaced drag type blades I4 operable to make an annular cut in the formation and leave a core for reception by the drill. An inner barrel I5 is arranged longitudinally in the outer barrel I0 to receive the core. A collar I6 on the lower end of the inner barrel I5 -cooperates with a 10 recess in the head I3 to support the inner barrel. 'I‘he inner barrel I5 extends through the outer barrel Ill with substantial clearance leaving an Ports I‘I in the collar I6 connect this fluid space with 15 discharge ports I8 in the head I3. A core catcher I9 is provided in the head I3 to grip and retain ‘ annular ñuid space in the outer barrel. the core. The blades I4 cut or leave _the up standing core which is received in the barrel I5 as -the drilling progresses. The core catcher I9 20 is operable to break loose the core and to retain the core in the barrel I5 when the drill is re moved from the well. ‘ rel I5. The cage 22 is a tubular member having its lower end in communication with thev inner barrel I5 and having its upper end in communi cation with the interior of the outer barrel I0 and the drilling string. The tubular cage 22 is' provided between its ends with a chamber 34 for containing the ball 24. A downwardly facing annular shoulder 35 is provided on the lower end of the cage 22 to seat downwardly against the upper end of the body 20. A reduced portion 36 is provided on the lower end of the cage 22 and ñts downwardly into the upper portion of the tu bular body 20. An annular internal iiange 31 is provided in the body 20 and is engaged by the lower- end of the said portion 36. The chamber 15 34 in the cage 22 has closed sidewalls and is -only Y open at its upper and lower ends. ' It is a feature of the invention that the device or valve includes two spaced opposing seats 23 and 38. The seat 38 is provided at the upper end 20 of the chamber 34 while the seat 23 is provided at the lower end of the chamber, as will be herein after described. In the 'simple structure illus The improved valve of the present invention includes, generally, a body 20, means 2I for re ltrated the seat 38 is a tapered annular face on an 25 movably securing the body 20 to the upper end internal restriction or flange 39 occurring at the of the inner barrel I5, a cage 22 on the body 20, '_ upper end of the chamber .34. 'I'he side walls of a valve seat 23 in the body 20 connected with the the chamber 34 preferably converge upwardly to cage 22 and a valve or ball 24 in the _cage 22. the seat 38 to guide the ball 24 to the seat. The The body 28 may be a simple tubular member opening in the tubular extension or portion 35 is 30 as illustrated in the drawing. In practice the suiiiciently large in diameter to allow the ball 24 body 20 may be comparatively short and may have to cooperatel with the seat 23, as illustrated in relatively thick walls. The tubular body 2li is Figs. 1 and 2. ' adapted to enter the upper end of the inner barf The cage. 22 is preferably provided with a plu rel I5, as will be more fully described._ The op rality of circumferentially spaced wings or guide 35 posite ends vof the body 22 may be flat and nor ribs 40. The ribs 48 project outwardly or radially mal tov its; longitudinal axis. . from the cage 22 and have outer longitudinal fl‘liea'neans` 2i for securing the body 20 to the edges'adjacent the inner wall of the outer barrel inner barrel> I5 is such that the valve may be I0 to definitely limit working or tilting of the ` ».fea'sily -`’and quickly connected to and removed inner barrel I5. The ribs 40 operate to centralize ¿from the inner barrel. The means 2| includes a and stabilize the upper portion of the inner bar ` Lcoarse steeply pitched thread 25 on the body 20 rel I5. The upper ends of the guide ribs 48 may .5.40 r` '. mating’with a similar thread 26 on the barrel I5. In'theconstruction illustrated the inner barrel I5 ‘ - has a tubular extension connected to its upper end 45 by welding at 2'I and this extension carries the thread 26. _ It is to be understood that the thread 28 may be formed on the barrel I5 and I will con sider the above-mentioned extension- as a part or y 5ol continuation of the inner barrel. The thread 25 is preferably an external thread for cooperating with an internal thread 26 on the barrel I5. The threads 25 and 26 are steeply pitched so that the valve body 20 may be quickly threaded in I place. The body 28 may have a downwardly 55 facing external shoulder 28 for cooperating with the upper end of the inner barrel I5 to limit down ward threading of the body. The means 2l further includes a _latch 29 for preventing unthreading of the body 20. The latch 60 29 is pivotauy supported by a pm an earned by' spaced lugs 3| on the upper endvof the body 20. The latch 29 projects downwardly and is partially received in a groove 32in the exterior of the body 20. The lower portion of the latch 29 is received operating with the notch 33 prevents turning and unthreading of the body 20. The surrounding and confining outer barrel I0 limits outward piv-' 70 oting of the latch 29. and may prevent therlatch >from disengaging from the notch 33. . 'I'he cage 22 houses or contains the valve mem ber or ball 24 and in the form ofthe invention illustrated serves to carry the seat 23 and to guide and stabilize the upper portion of the inner bar-v 30 35 40 be inclined downwardly and outwardly. In prac tice the ribs..40 may be integral with the cage 22. One of the ribs 40 is provided atf its lower end with an extension or lug 4I adapted to cooper-‘ 45 ate with a notch `42 in the upper end of the body 20. 'I'he lug 4I cooperating with the notch 42 prevents relative rotation between the body 2|! and the cage 22. 'I'he lug 4I is retained in the notch 42 in the manner to be subsequently de 50 The valve seat 23 is provided in the body 28 and the cage 22 and is engageable by the ball 24 when the ball seats downwardly to prevent the entrance of circulation ñuid into the core receiv 65 ing barrel I5. The seat 23 may be a simple an nular member or tubular member, as illustrated. In accordance with the invention the seat 23 is threaded' upwardly into the lower portion 36 of the cage22 to have its upper end adjacent the lower wall of the chamber 34. An outwardly projecting annular flange 43 is provided on the seat 23 to engage upwardly against the body flange 81. 'I'he flange. 43 is preferably provided 65 in a notch 33 in the upper end of the inner bar- ' on the lower end ofthe seat 23. rel I5. It will be apparent how the latch 29 co 25 It will be ob 65 served that the iiangr 43 engaging upwardly against the flange 31 holds .the cage downwardly against the body 2li and, therefore, holds the lug"4|'in the-notch 42. The upper end of the - valve seat k23 >is provided with a suitably formed 70 sealing face 44 engageable by the ball 24. 'I'he lower end of the seat 23 is provided with two diametrically opposite notches 45. vThe notches 45 are adapted to receive a tool for threading the seat 23 into the cage portion 33 75 aioaeos when the valve is assembled. When the seat 23 3 course, tends to flow downwardly through the has been properly threaded in place a bar 66 is cage 22 and the -inner barrel i5. The ñuid thus arrangedthrough the notches d5 to have its oppo pumped downwardly through the drill moves the site ends 'at the internal wall of the body 2d. The ball 2t downwardly against the seat surface td. ends of the bar dii are welded to the body 2B at The ball 2d engaging the seat surface ‘ld prevents di?. The vbar' ¿i6 cooperating with the notches . the downward ilowë of circulation iluid into the d5 ‘and rigidly secured to the body 2d prevents inner barrel it. Thus the' bali 2t prevents the rotation of the seat 23 relative to the body 2d circulation ñuid from entering the inner barrel and the seat ilange ¿i3 cooperating with the 10 flange 3l holds the lug ti in the notch dias de 15 20 30 , to wash away the core as the core is received in ‘ the inner barrel it. When the `upstanding core scribed above, so that the entire assembly is locked' enters the‘inne'r barrel I5 it tends to displace the' l0 'against disconnection and loosening. f fluid upwardly from the inner barrel. When the The ball 2t may be a plain cylindrical member, pressure on the fluid in the inner barrel becomes as illustrated in the drawing. The ball 2d is pro greater than the pressure on the circulation fluid portioned to properly cooperate with the seat dit the ball 2d raises from the seat surface M and and the surface il@ of the seat 23. The ball 2t permits'the escape of the trapped iìuid from the 15 is movable through the chamber 3d with substan inner barrel iii. As described above, the fluid tial clearance to permit fluid flow through the trapped in the inner barrel i5 is a light, relatively chamber when it is unseated from the seats t@ _ clean'ñuid and does not interfere with the free and 23. The ball 2d may be a solid metal mem entrance of the core to the barrel i5. 20 ber. However, it may be hollow- or formed of a The core` drill valve provided by the inven material of relatively low specific gravity to m'ore tion operates to prevent the entrance of thick, readily rise against the seat 38 with fluid flowing heavy mud into the core receiving barrel when upwardly through the chamber at. _ the drill is run into the well. This is important In operation the core drill is connected with the as it prevents such heavy mud from clogging 25 lower end of a tubular well drilling string and is ` the inner barrel to interfere with the reception of run into the well on the lower end of the string. the core. The valve is also effective in preventing The well bore is usually iilled or substantially filled the >downwardly flowing circulation ñuid from withy the rotary mud ‘employ i. î‘n the rotary entering the inner barrel to Awash "away the core. method of well drilling. When the drill is run The bod-y 2t of the valve may be easily and quickly 30 downwardly into the well the drilling string is, of threaded onto the inner barrel iä and is de course, empty and the ñuid in the well ñows up wardly through _the inner barrel i5 and through the portsx id and il to pass through the outer The fluid passing upwardly into the 35 barrel it. pendably locked in_ place by the latch 29. The removable cage 22 and the releasable seat 23 are securely lato-hed or locked to the body 2li by the lugdi and the bar dt and cannot becomedis~ 35 inner barrel i5 rushes through the cage 22 at a3 placed. The seat 23 and the cage 22 may be substantial velocity and raises the ball 2d so that readily'replaced when worn. The valve is easy to it seats upwardly against the seat 3d. The ball install and is dependable in operation. , 2d engaging upwardly against the seat 38 of ' Having described only a typical preferred form 40 course prevents further ilow through the cage 22 and application of my invention, I do not wish to 40 and thus prevents the further, entrance of ñuicl be limited or restricted to the specific details into the inner barrel `l 5. It will be apparent that the fluid received in the inner barrel l5 prior to closing of the' valve 2t is the fluid _in the upper 45 portion oi’l thel well bore. The fluid standing in the upper portion of the well bore is light and carries a minimum of solidmatter in suspension as such solid matter tends to settle inthe well. Thus the inner barrel i5 is occupied by clean and 50' relativelylight fluid or liquid. . „ The ball 2d remains closed against the seat 3d as the drill is run through the bore to its lower'end.` In running a drilling string into a well it is necessary to connect or make up threaded 55 connections-in the string.I During these opera tions the drilling string does not move down wardly. However, the column of fluid standing herein set forth, but wish yto reserve to myself any variations or modifications that may appear to those skilled in the art or fall within the scope ` I of the following claims: ` 45 Having described my invention, I claim: 1. In a well core drill having a core receiving barrel, the combination of, a cage structure on the l upper end of the barrel having a chamber, valve seats at the upper and lower ends of the cham 50 ber, the wall of the chamber being inclined up wardly and inwardly toward the seat at the upper end of the chamber, and a movable valve mem ber in the chamber for cooperating with the _ seats. 55 ' 2. In a well core drill having a core receiving barrel, the combination of, a body, steep threads in the well around the outer barrel ld and the ' connecting the body with the barrel, latch means drilling string is higher than the column Vof fluid preventing unthreading of the body, a cage on 60 in the string so that a differential in pressure the body, and means controlling fluid ñow 60 exists which maintains ‘the ball 2d upwardly against the seat 3d. Accordingly, the ball 2d remains in cooperation with the seat 3E during the running of the tool into the well. When the core 65 drill approaches the lower end- of the well bore occupied by the heavy thick mud this mud is pre vented from entering the inner barrel l5 by the relatively light and clean iiuid completely oc cupying the inner barrel. 70 l When the drill is in position at the bottom of the welll the circulation ñuid is pumped down . wardly through the drilling string to discharge - from the core drill. This downwardly ñowing cir - culation fluid flows through the outer barrel I@ through the cage. , , 3. A valve for use on the core receiving barrel of a well core drill including, a body connected with the upper end of the barrel, the body having a notch, a cage seating on the body, a part on 05 the cage cooperating with the notch, means hold ing the cage against the body, and a valve mem ber in the cage controlling fluid ñow there through. v - y 4. A valve for use on the core receiving barrel 70 of a well core drill including, a body connected with the upper end of the barrel, the body having a notch, a cage seating on the body, a part on the cage cooperating with the notch, means holding to discharge from the ports l'll and I8 and, of , the cage against the body, a seat threaded in the 75 2,109,903 4 cage, e. non-rotatable connection between the seat and the body, and a. valve member in the cage for cooperating with the seat. 5. A valve for use on the core receiving borrel cage where the lug is in the notch, the seat hev ing o notch, a. bar secured to the body and co operating'with the notch in the seat to prevent unthreading of the seat, and a. ball in the cage of o. weil core drill including, a body connected for cooperating with the seat. with the upper end of the barrel. the body having 8. A vai-'1e for use on the core receiving barrel of a well core drill including, a body connected a. notch, a. cage on the body leaving o. multiplicity o1 external ribs, one of solo ribs cooperating with the notch, a seat threaded to the coge, o non 16 rotatabie connection between the :seat and the body, end a valve in the cage moei-ating with the sect. ' 6. A valve for me on the core receiving barrel of o, well core drill including, n body connected with the upper end oi the barrel, the body having a notch, a. cage on the body having o. lug coop eratlng with the notch, a seat threaded ‘to the cage end cooperating with the body to hold the cage where the lug is in the notch, menne gore venting unthreading of the sent, end o. ball in the cage for cooperating ‘with the seat. 7. A valve for use on the core receiving leer rel of a Well core drill including. s. body connected With the upper end of the barrel, the bodyhaving a notch, a cage on the body having e lug coop erating with the notch, e seat threaded to the cage and cooperating with the body to hold the , with the upper end oi’ the borrel, the body having o. notch, e. cage on the bony having e. lug coop erating with the notch, o. seat tin‘enoed to tlie coge and cooperetim;f with the body to hold the coge where the lug is in the notch, a second seat in the coge spaced above and opposing the Erst mentioned seat, a ball in the cage for cooperat ing with the seats, and means preventing un» threading of the first mentioned neat. 9. in n well core drill having a core receiving barrel, the combination of, o. tubular valve coge bovino an upwardly end inwardlyv inclined side woll, means removably securing the cage to the 20 said barrel, vnlve seats at the upper and lower ends oi the coge, one oi' said sects being remov-elaie, and a. ball in the cage operable to cooperate with the seats, said inclined side well guiding the. 25 bell lto the upper seat. JOHN E. HOWARD.