Патент USA US2138006код для вставки
Y Novi-‘9,1938 l , ` J. H, HOWARD ROTARY GORE-DRILL Fiï‘ed oet. 14, 1955 L l \ ` QNI». (/@4ßè% r\ /lv 24 ` ' i " Q. m“ - ' _21,133,006 , Patented Nov. 2.9, 1.938. ¿ 2,138,006 UNITED sTATEs PATENT OFFICE 2,138,006 ROTARY CORE DRILL . John H. Howard, Huntingtonv Park, Calif. Application October 14, 1935, Serial No. 44,884 3 Claims. (CL 255ë'12) This invention relates to a well tool and relates vention will bel fully understood from the fol lowing detailed description of a typical preferred more particularly to a well drill capable of ob taining a sample or core of the earth formation. A general object of this invention is to provide 5 a simple, practical> and improved rotary core taking Well drill. - Another object of this invention is to provide a rotary well drill embodying a core barrel hav ing a cutting head and adapted to be fed into 10 the earth formation to cut and receive a core of the formation'and then be withdrawn from the well to permit the core to be examined Without removing the outer barrel or drill proper. Another object of this invention is to provide 15 a Well drill of the character mentioned in which the core barrel may be fed into the earth forma tion in advance of the head of the drill and ro tated with the drill to obtain a core of the Aforma tion and then removed from the well with the 20 core contained therein without enlarging the bore it has formed, thus leaving a reduced bore or rat-hole. The operation of the core barrel‘in advance of the drill head to form a reduced .bore and the subsequent removal of the core 25 barrel without enlarging the reduced bore are important and facilitate the testing of the Well as a suitable well tester may be run into the rat hole or reduced bore following the examination of the core obtained without the necessity of -30 running a special drill into the well to form a rat-hole to receive the tester. Another object of this invention >is to pro vide a sample taking drill of the character men tioned in which the core barrel is fed down 35 wardly into the formation in advance of the outer barrel by hydraulic pressure or iiuid pres sure. Another object of this invention is to provide a well drill of the character mentioned that em 40 bodies a simple positive and eiïective means for transmitting rotation from the outer barrel to the ñuid pressure actuated core barrel during the drilling and core cutting operation. Another object of this invention is to provide 45 a drill of the character mentioned that includes means for informing the driller that the core barrel has reached the lower end of its down ward stroke and, therefore, has received a core of sufficient length. 50 A further object of this invention is to pro vide a core taking well drill of the character mentioned that embodies a minimum number of simple sturdy parts and that is inexpensive of manufacture. The_various objects and features of my in form and application of my invention, through out. which description reference is made to the accompanying drawing, in which: - ‘ ‘ K 5 Fig. 1 is a central longitudinal detailed sec-" ‘ tional view of the drill provided by this invention ' illustrating the core barrel in the operative posi tion. Figs. 2, 3 and 4 are transverse detailed sectional views taken as indicated by lines 2_2, 10 3_3 and 4---4, respectively on Fig. 1. - The well drill of the present invention in cludes, generally, an outer barrel I0 having a cutting head Il on its lower end, a core barrel I2 adapted to be run into the outer barrel I0, 15 and means I3 for feeding or advancing> the core barrel I2 into the earth formation to obtain a core. f The outer barrel I0 constitutes the body of the drill and is a tubular structure adapted to be 20 y connected with the lower end of a drilling string. In the particular form of the invention illustrated in the drawing the outer barrel I0 is sectional comprising an upper tubular section I4 and a lower tubular section I5. Means is‘provided at 25'l the upper end of the upper section I4 for facili tating the connection of the drill withV the drill ing string. This means may take the form of a threaded socket I6 for receiving a threaded pin on the lower end of the string. A suitable 30 threaded pin and socket connection I1 is provided to connect the two sections I4 and I5 of the barrel I0. A threaded pin I8 is provided on the lower end of the section I5 to carry the cutting head II. In accordance with the invention any suitable form or type of cutting head may be provided on the barrel I0. In the drawing there is shown a typical cutting head comprising a >tubular shoe I9 threaded on the pin I8 and spaced cutting parts 20 on the shoe. The cutting parts 20 are in the form of lblades projecting downwardly and outwardly from the lower> end of the.shoe I9 for making an annular cut in the earth formation. The blades v2li project in wardly at the lower end of the shoe I9 and are operable to make an annular cut of substantial radial width or extent. During the drilling oper ation circulation fluid `passes downwardly through the longitudinal opening 2l of. the bar rel I IJ to discharge from the cutting head II. The opening 2l is comparatively large in diam eter to receive the core barrel I2 and parts’ are provided on its wall to cooperate with the core barrel as will be hereinafter described. 'I'he core barrel I2 is an elongate tubular mem- 35 40 45 50 55 2 2,138,006 ber adapted to be dropped or lowered through the drilling lstring‘lto pass into the outer bar wardly and inwardly to central upwardly facing edges. The lower ends of the splines 31 may be rel IIJ’an'd may be' fed downwardly by the means similarly formed and when the core barrel I2 is I3 to cut into the formation in advance of the _lowered or run into the outer barrel III the lower cutting head II and receive a core. The core barrel I2 is comparatively long and is adapted to ñt in the opening 2| of the outer barrel III with substantial clearance leaving a ñuid passage P. The longitudinal opening 22 of the barrel I2 is open at its lower end and is adapted to> receive the core of the earth formation as the barrel is rotated and fed downwardly into the earth for mation. In accordance with the invention a cutting head 23~is provided on the lower end of ’ 15 the core barrel I2. The cutting head 23 is pro portioned to pass downwardly through the outer barrel III and to pass between the blades 20 of, the cutting head II, and is operable to make an annular cut and leave a core of the earth forma 20 tion for reception by the core barrel I2. The ì cutting head 23 includes cutting parts 24'in the form of downwardly projecting blades arranged in an annular series to make an annular cut when the barrel I2 is rotated and fed downwardly. A 25 core catcher>25 is provided to retain and sup port the core in the core barrel I2. The partic ular core catcher 25 illustrated in the drawing is amore or less typical form of core catcher ro tatably supported in the cutting head 23 and em 30 bodying upwardly and inwardly projecting spring ñngers 26. ends of the splines 31 engage the pitched ends ' of the lugs 38 and this cooperation causes the core barrel I2 to turn to a position where- its splines 31 are free to pass downwardly between the splines 36. The splines 31 are thus engaged with the splines 36 without excessive shock to the parts. The splines 36 and 31 are formed and related to centralize the core barrel I2 in the outer barrel I0 `and to permit the free downward feeding or movement of the core barrel I2 rela tive to the outer barrel II). The spaces between 15 the spaced splines 31 constitute continuations of the passage l?, as illustrated in Fig. 4, when the core barrel I2 is in the operative position within the outer barrel I0. The -lugs 38 spaced up wardly from the splines 36 may assist in guiding '20 and centering the core barrel I2. The means I3 for advancing or feeding the core barrel I2 into the earth formation isla fea ture of the invention as it provides for the ad vancement of the core barrel I2 relative to the 25 outer barrel I0 during rotation of the drill to movevthe cutting head 23 downwardly in ad vance of the cutting head II so that the barrel I2 receives a .core of the formation in advance of the cutting head II. The feeding or advanc 30 ing means `I3 is in the nature of an hydraulic A valve is provided on the upper end of the core barrel I 2 to prevent the circulation fluid means or iiuid pressure means and is under the from washing downwardly through the core bar the invention the means I3 includes a piston or plunger on the upper end of the core barrel I2 35 35 rel and to permit the discharge of fluid from the core barrel as it is displaced by the entering core. ’I‘he vvalve may include a connector or adapter 21 threaded into a socket 28 in` the upper end of the. core barrel I2 and carrying a transverse or 40 horizontal web 29. The web 29 has a, central vertical port 38 which is controlled by a down Vwardly seating valve or ball 3I. An upstanding rim 32 is provided on the web 23 around the port 30 to wassist in retaining the ball 3| against dis placement. A member 33 projects upwardly from the adapter 21 and has a Valve chamber 34 re ceiving the n'm 32 and confining the movable ball 3|. Ports 35 connect the chamber 34 with the passage P to permit the discharge of fluid v50 from the interior of the core barrel I2 when th valve or ball 3| is open. ' 'I‘he invention provides a novel releasable drive for transmitting rotation from the outer barrel I0 to the core barrel I2.` This drive is such that 55 it is automatically engaged when the core bar rel I2 is dropped or run into the outer barrel I0. 'I‘he rotation transmitting drive includes a plu rality of spaced longitudinal splines 36 on the wall of the openings 2| and a plurality of spaced 60 longitudinal splines 31 on the core barrel I2 for cooperating with the splines 36. The splines 36 are preferably on the interior of the lower bar rel section I5. When in engagement the splines 36 and 31 form a positive rotative drive between 65 the outer barrel IIIV and the core barrel I2. Novel and particularly effective means is pro vided for guiding or directingthe splines 31 of the core barrel I2 between the splines 36 when the core barrel is dropped or run into the outer 70 barrel I II. A plurality of circumferentially spaced lugs 38 is provided on the wall of the opening 2|. The lugs 38 are spaced above the upper ends ofthe splines 36 and are in vertical or longi tudinal alignment with the splines. The upper 75 ends of the lugs 38 are pitched or inclined up full control of the driller. In accordance with operating in the opening 2| of the barrel Il).l 'I‘he plunger comprises a sealing element 40 sur rounding the upper end portion of the member 33 and bearing downwardly against an annular flange 4I on the member. A head or nut 42 is 40 threaded on the upper end portion of the mem ber 33 to clamp or retain the sealing element 40 in position. 'I'he sealing element 40 is shaped and proportioned to effectively seal- outwardly against the wall of the opening 2| under the ac tion of downward ñuid pressure. Means is provided for producing a diiîerential or drop in pressure at the opposite sides of the sealing element 40 so that the pressure on the circulation fluid pumped through the drilling 50 string feeds or forces the core barrel I2 down-. wardly. The member 33 has la fluid chamber 43 below the flange 4I and spaced ports 44 extend ing upwardlyfrom the chamber 43 to its upper end. Ports 45 in the wall of the member 33 con nect the chamber 43 with the fluid passage P. Oriñce members or chokes 46 having small ports 55 or passages 41 are provided in the upper portions of the ports 44. The chokes 46 operate to ma terially restrict the flow downwardly through the ports 44 to provide for a substantial drop in fluid pressure at the lower side of the sealing element 40 so that the circulation iiuid under pressure pumped downwardly through the string acts on the sealing element 40, the nut 42 and the upper end of the member 33 to force or feed the core barrel I2 downwardly relative to the outer bar rel I0. A stem 48 is provided on the upper end of the member 33 to facilitate the handling of _ the core barrel I2 by a line provided with an over shot or other device for engaging the stem. The upwardly projecting stem 48 is provided with a tapered head 49 readily engageable by an over shot or similar ilshing tool. "il O In accordance with the invention the drill is 75 2,138,006 constructed to automatically signal to the driller that the core barrel I2 has recelveda sufficient amount of core. During the core receiving op eration the fluid pressure acting on the sealing 3 This contact of course limits downward move ment of the core barrel I2. When the flange 4I is in engagement with the lugs 38 the lugs cp pose the ports 45 to close or restrict the ports. element 40, the nut 42 and the upper end of the This stops or reduces the downward flow through member 33 feeds the core barrel I2 downwardly the drilling string and causes the pumps forcing the fluid through the string to labor. The labor more rapidly than the outer barrel I0 is ad vanced, moving the head> 23 downwardly into ing of the pump or pumps indicates to the driller the earth formation in advance of the head II. that the core barrel I2 has reached the lower The lower side of the flange 4I is adapted to end of its stroke and has obtained a core of suf 10 cooperate with the upper ends of the lugs 38 to ficient length. When the pump or pumps labor limit the downward travel of the core barrel I2 the driller discontinues the rotation and down relative to the outer barrel I0. The parts are ward feed of the drilling string and prepares to proportioned and related so that the inner sides ` remove the core barrel I2. A cable carrying an overshot or the like is run into the drilling string 15 15 of the lugs 38 directly oppose and close or sub stantially close the ports 45_ when the lower side and the overshot or fishing tool is engaged with of the flange 4I cooperates with the upper sides the stem 48 to remove the core barrel. The line of the lugs 38.` Thus the downward flow of the or cable is raised to pull the core barrel I2 `up circulation fluid is stopped or materially retarded wardly out of the outer barrel IIJ and upwardly 20 simultaneously with the stopping of downward through the drilling string. When the core bar movement of the core barrel I2 relative to the rel I2 is movedv upwardly the core catcher 25 outer barrel I0. The restriction or closing of grips and holds the core to retain it in the core the ports 45 by the lugs 38 causes the pump or barrel. Thus the core is retained in the core bar pumps delivering the circulation fluid to the rel I2 and maybe examined when the core barrel 25 has been brought to the surface of the ground. 25 drilling string to labor, indicating to or inform » The withdrawal of the core barrel I2 as just ing the drillerv that the core barrel I2 has reached the lower end of its downward stroke described leaves a reduced bore or rat-hole in the lower end of the well. If the sample or core and has received a sufficient core. In operation the cuter barrel Ill is connected obtained in the core barrel indicates that it is 30 with the lower end of a well drilling string and desirable to make a test of the formation a well 30 run into the well for operation in accordance tester may be run into the well to pass or extend with the rotary method of well drilling. When into the reduced bore formed by the cutting head it is desired to obtain a sample or core of the 23 of the core barrel I2. The drill involving the earth formation to determine its character the core barrel I2 fed into the formation in advance 35 core barrel I2 is dropped or run through the of the principal cutter II and removable from 35 drilling string on a cable to land or come to rest the well without enlarging the reduced bore it in the outer barrel I0. As the core barrel I2 has formed conditions the well for testing by a moves downwardly through the outer barrel I0 well tester without further drilling. If the charm acter of the core obtained is such that it is not the lower ends of the splines 31 contact or en 40 gage the tapered upper ends of the lugs 38. The deemed advisable to test the formation the drill 40 taper of the lugs 38 causes the core barrel I2 ing may be continued with the drill and cores to turn to a rotative position where its splines may be taken from time tov time by means of 31 may pass down between the splines 36 on the core barrel I2. The present invention pro the wall of the opening 2|. Thus the splines 36 vides a rotary well drill involving a core taking 45 and 3’I are engaged to form a positive- rotative means that is positively rotated with the drill 45 drive between the outer barrel III and the core and that is fed into the formation in advance of the principal cutter by hydraulic pressure to ob barrel I2. ` _Rotation of the drilling string is then resumed tain a core and to leave a reduced bore or rat and the circulation ñuid is pumped downwardly hole. The tool is easy to control and operate 50 through the drilling string to pass through the and involves a minimum number of sturdy parts. 50 chokes 46, the ports 44, the chamber 43, the ports 45 and ñow out through the passage P. The chokes 4'I provide for a substantial drop in the pressure on the fluid below the sealing ele 55 ment 48 so that the pressure acting on the seal ing element, the nut 42 and the upper end of the member 33 urges or feeds the core barrel I2 downwardly. Thus the core barrel I2 is fed downwardly relative to the outer barrel I 0 and 60 is rotated with the outer barrel so that its cut ting head 23 cuts into the earth formation. The hydraulic pressure acting downwardly on the core barrel I2 causes the cutting head 23 to drill into the formation in advance of the cutting head 65 Il. The cutting head 23 fed downwardly in ad vance of the cutting head II forms -a reduced bore in the lower end of the well and leaves a core which is received in the core barrel I2. As the core is receivedin the core barrel I2 the fluid trapped in the core barrel is displaced through the port 30, the chamber 34 and the ports 35. The drilling or coring operation is continued until the core barrel l2 is fed downwardly rela tive to the outer barrel I0 to a point wherev the 75 lower end of- the flange 4I contacts the lugs 38 70 Having described only a typical preferred form` and application of my invention I do not wish to be limited or restricted to the specific details herein set forth, but wish to reserve to myself any variations or modifications that may appear 55 to those skilled in the art or fall within the scope of the following claims: Having described my invention, I claim: 1. A rotary well drill including a tubular body adapted to be operated on a tubular drilling 60 string, a tubular cutting head on the lower end of the body, a core barrel adapted to be passed through the string to the interior of the body, means for transmitting rotation from the body to the core barrel, a cutter on the core barrel 65 operable to-cut a core for reception by the core barrel, means for feeding the core barrel down wardly to cause its cutter to'cut a core in ad Vance of the cutting head, and means for audibly signaling to the driller when the core barrel has 70 been advanced a predetermined extent. 2. In a rotary well drill construction, a barrel adapted to be operated on the lower end of ~a tubular drilling string, longitudinal splines on theinterior of the barrel, a core receiving barrel 76 4 2,138,006 adapted to be passed through the string into the end of the barrel, a, core barrel adapted to be barrel, splines on the core receiving barrel adapt ed to slidably cooperate with the splines on the passed through the string into the barrel, parts rel, and a plunger carried by the core barrel for there being a longitudinal ñuid passage between on thewbarrel and core barrel adapted to co barrel, lugs on the barrel for guiding the splines . operate to transmit rotation and allow longitu of the core barrel between the splines of the _bar dinal movement of the "core barrel in the barrel, operating in the barrel, a head on the core barrel » the barrel and core barrel, a plunger on the core having a port establishing communication be tween the string and the interior of the barrel and effecting a drop in pressure below the plung er whereby the fluid pumped through the string acts on the >plunger to feed the core barrel downwardly, one of the lugs substantially clos ing the port when the core barrel has been fed _15 a predetermined distance.- < 3. In a rotary well drill construction, a barrel adapted to be operated on the lower end of a. tubular drilling string, a cutter head on the lower barrel operable in the barrel, there being a port in the core barrel establishing communication. between the string and the passage and eiïect ing a drop in pressure below the plunger whereby fluid pumped through the string feeds the core barrel downwardly relative to the barrel, and a part on the barrel adapted to restrict the ilow through the port when the core barrel has been 15 fed downwardly a predetermined extent. JOHN H. HOWARD.