Патент USA US2113821код для вставки
April .12, ‘1938. L. F. BAASH ' 2,113,821 SAFETY JOINT Filed Feb. 24, 1936 v A m , M ' // ' A? 26' // 26 f2: 76 /0 Z/ /J 50 34 35 3 /.9 Z0 6' ( 2,113,821 Patented ‘Ape-1a, 1938 UNITED vS'I'ATES PATENT OFFICE . ' _ . 2,113,821 a . ' ‘ sam'rr Jom'r Lawrence F. Baash, m Ant?les, Calif. Application February 24, 1936, Serial No. one“ 9 Claims. (crass-2s) I a ' are enlarged transverse detailed sectional views taken as indicated by line 4-4 on Fig. 2 and line 5—5 on Fig. 1; respectively. This invention relates to a connection. or joint and relates more particularly to a safety joint for use in a well drilling string. A general ob ject of this invention is to provides. practical, The improved'safety joint of this invention includes, generally, two sections A and B having - 5 effective and dependable safety joint. cooperating threads “I, shoulders II and I2- on the sections A and B, respectively, de?nitely equipment that is capable of ‘dependably trans- ' limiting threading together of the sections and mitting rotation and longitudinal forces during control means or detent means I3 resisting or 10' 10 drilling and other operations and that may be . controlling unthreading of the sections A and B. The sections A and 2B are adapted to be con easily released or disconnected when desired or , nected with, parts or members of a well drilling necessary. ‘ Another object of this invention is to provide string S to form a connection between them. The joint sections-A and B are elongate parts a safety joint of the character mentioned‘ that and are telescopically assembled one section be 15 15 may be readily released or disconnected when ing an inner part and the other section being an connected in a drilling string in a well bore by Another'object of this invention is to provide a safety joint for use in a string'of well drilling merely turning the string in a reverse or left hand‘ direction. ' - . . outer part. In vthe particular relationship illus » trated the section A is the-upper section of the - Another object of this invention is to provide :0 a safety joint that will not become loosened or disconnected by back-lash or relatively unre~ sisted reverse rotation of the drilling'string. Another object of this invention is to provide a safety joint of the character mentionedthat cannot become excessively tightened or jammed by the application or transmission of heavy for ‘ ward rotational forces or by heavy longitudinal strains and, therefore, maybe easilyreleased at any time. 30. - Another object of this invention is to provide a safety joint of the character mentioned whose release or disconnection is controlled so that it cannot be released by-unintentional or unavoid able reverse rotation but may be easily released by the'positive application of reverse torque of a known magnitude followed by reverse rotation of the string. _ ' Another object of this invention is to provide a safety joint that embodies a novel spring urged control pin or detent normally resisting discon nection of the joint sections. and that releases or yields only upon subjecting‘ the joint to a re verse torque of a known or predetermined mag ' nitude. ' _ lustrated in the drawing may be reversed. The section A is provided at its upper or outer end with means for connection with the string S. In 25 the case illustrated a tapered socket I4 is pro vided in the upper or outer end of the section A to receive a threaded pin IS on a tool joint sec tion or other part of the ‘string S. The upper or outer exposed portion of the section A may be cylindrical and of the same diameter as'the adjacent part of the ‘string S. The major inter mediate portion of the joint section A is reduced in diameter being in the nature of a stem IS. The stem l8 carries a thread Ill. The thread lllxis coarse or heavy and has a substantial pitch or lead. The inner or lower portion ll of the stem I6 is. reduced in diameter and is prefer-' ably cylindrical. A central longitudinal ?uid passage l8 extends longitudinally through the of the sectionv A and is provided at its lower or outer end with means for connecting the string 45 The various objects and features of my inven ‘ tion will be fully understood from the following tion B to thread in a socket 20 in a tool joint which description reference is madeto the ac companying drawing, in which: ‘ _ ' Fig. 1 is a side'elevation of the safety joint provided by this invention fully made up or con nected. ‘Fig. 2 is a fragmentary side elevation of the safety joint showing the stop shoulders in the released condition. Fig. 3 is an enlarged lon gitudinal detailed sectional view taken as indi m cated by line 3-‘3 onvFig. -1 and Figs. 4. and 5 40 . section A from the bottom of the socket M to the end- of the stem portion H. The section B is formed to receive the stem iii S. In the particular embodiment of the inven tion shown; in the drawing a tapered pin I9 is _ and application ‘of my invention, throughout 55 that the positioning of the sections A and B il A further object of this invention is to provide an improved ‘safety joint of the character men tioned that is simple and inexpensive. detailed description of a typical preferred form . joint and constitutes the inner part of the joint while the section B is the lower part and forms 20 the outer part of the joint. It will be obvious provided on the lower or, outer end of the sec section or other part of. ‘the string S. The joint 50 section B may be cylindrical in its external con ?guration and may- be of substantially the same diameter as the exposed portion of the [section A and the adjacent members of the string S.‘ A socket or opening 2| extends longitudinally 55 through the section' B from its upper or inner end. The opening 2| is provided to receive the stem Ii of ' the section A and has a thread H) on its wall for cooperating, with the thread III of the. stem IS. The opening 2| has a reduced 60 2,113,821 ' 2 inner or'lowerpo'rtion 2|“ for receiving the por The means I3 includes a spring pres‘sed‘latch pin tion H of the stem I6. A ?uid passage 22 con or detent 30 on one section of the joint for co tinues downwardly or outwardly from the openi ing portion 2|“ to conduct the circulation ?uid to the adjacent member of the string S. Packing means may be provided for sealing be tween the joint sections A and B to prevent the operating with a recess or socket 3| in the other section. In the particular form of the invention illustrated the detent 30 is ‘provided on the joint section B and the socket 3| is provided in the section A, it being understood'that, this relation leakage ‘of circulation'fluid from the passages‘ I8 and 22. An annular groove 23 is provided in the ship between the detent-landlsocket'mayibe re versed if desired. A_lateral or radial opening 32 portion I‘! of the stem I6 and carries a ring 24 is provided in the wall of the section B to carry of rubber or other suitable packing material.‘ the detent 30. The opening 32 extends through Ports 25at are provided in the stem portion," to the wall of the section B to communicate with extend outwardly from the passage I8‘-‘to the.‘ the inner portion 2Ia of the opening 2I. The de groove 23 so that the inner surface of the pack tent 3Ilyis in the nature of a control pin having a head~30adapted to project from the opening 15 15 ing ring 24 is subjected to the action of the ?uid pressure in the passage which urges the pack 32 to cooperate with the socket 3I. ' In accord ing ring 24 into tight sealing cooperation with the wall of the opening portion 2Ia.‘ ‘The ?uid pres-‘ ance with the invention the head 33 of the de tent'30 is tapered or conical. The extreme outer end of the ‘head 33 may be flat so that particles , sure actuated packing ring 24 effectively prevents 20 the outward leakage of the vcirculation ?uid and, of .dirt inthe socket 3| will not'preve‘nt the proper 20 cooperation between the head and ‘socket. The recess or socket 3| is‘ shaped to accurately or therefore, prevents erosion or cutting action of the parts. ‘ The shoulders II ‘ and’ I2 for ‘limiting the" properly receive the head 33 of‘the' detent 30. threading together of the joint sections may be 25 provided on any suitable convenient or practical" opposing faces or parts of the joint sections. In The recess or socket. 3| is conical or of inwardly diminishing cross section and is‘proportioned so that the detent head 33' has substantially even the typical preferred embodiment of the inven tion illustrated in the drawing the shoulder II cooperation with its wall. . occurs on the upper or inner end of the section 30 B and the section I2 isrprovided on the section A at the upper or outer end of its stem I6. The stem I6 being reduced in diameter provides the section A with an annular downwardly facing shoulder or surface 25. The shoulder I2 ‘is pro‘ -35 vided on the wall or surface 25. The shoulders »II and I2 are positioned to oppose or face one ?rm cooperation with the socket 3|- The ?ange 36 is adapted to cooperate with a shoulder 31 on the wall of the opening 32 to prevent inward dis placement and loss of the detent 30 when the joint is disconnected‘. The strength of the spring 40 35, the size of the detent head 33 and the socket 3| and the taper of the head \33 andthe socket wall determine the reverse torque necessary to The shoulder I2 on the section A faces forwardly 40 or in the direction of turning of the section A re quired to thread its stem I6 in the opening 2|, while the shoulder II on the section B facesin the opposite direction. The shoulders H and I2 are preferably substantially vertical or in a plane to - spring 35 is arranged in the opening 32 under compression between the plug 34 and a suitable flange 36 on the detent 30. The spring 35 is suffi ciently strong to urge the detent‘head 33 into another and their engagement de?nitely limits the threading together of the sections A and B. 45 extending longitudinally of the joint. " Spring means is provided to urge the detent .30 inwardly so that its head 33 forcibly cooper; ates with the socket 3|. A plug 34 is threaded 30 in the outer portion of the opening 32 and a release- the ‘detent head from the recess and ini In order tial unthreading of the threads Ill. The detent 45 to provide for the proper cooperation of the shoulders II and I2 the inner or upper end 26 of the section B and the surface 25 of the section A are helicoidally pitched or spiralled to be con tinuous surfaces‘ terminating at the bases and upper ends of the shoulders II and‘ I2. The sur faces 25 and 26 are pitched in the same direction as the threads I0 and have substantially the same 30 and the socket 3I are positioned and related to fully cooperate when the shoulders II and I2 . are in engagement .so that there is no slack or play in the joint when the joint is fully made up. In the use or operation of the safety joint pro vided by this invention the parts are assembled as illustrated in Fig. 3 of the drawing and the joint is connected in the string S as shown in I ‘lead or degree of pitch as the threads Ill. The 7 Fig. 1 of the drawing. When the parts are prop 55 shoulders II and I2 are positioned and related erly assembled the shoulders II and I2 are in engagement and the detent head 33 is bearing in the tapered socket 3|. When the string S is rotated or otherwise manipulated in the well bore to cooperate to prevent further threading to gether of the sections A and B before the threadsv II) are fully tightened down or tightly engaged. The shoulders II and I2 are of such extent that 60 the surfaces 25 and 26 are in engagement or im the shoulders I I and I2 cooperate for the posi tive transmission of forward or righthand rota _ mediately adjacent one another when the shoul ders II and I2 are in engagement and are free to pass one another, as shown in Fig. 2, upon the ' 60 tive forces and their engagement prevents tight ening or jamming of the threads ID by such The surfaces 25 arid 26 may, cooperate forces. for the transmission of compression strains to relieve the threads II]. The threads III, of course, 65 The control means or detent means I3 is anr effectively-transmit tensile strains during rais important feature of the present‘inve'ntion and ing of the string S and similar operations. The together with the shoulders I I and I2 assures the head 33 of the springurged detent 30 cooperates dependable operation and release of the safety with the socket 3I to dependably resist loosen ing or unthreading of the joint during operation 70 70 joint. The control means I3 operates to yield ingly resist unthreading of the sections A and B or manipulation of the string S. The head 33 so that the joint does not become loosened dur ' islforced into the socket 3I_ with sufficient pres ing operation of the string S and can only be sure to dependably prevent loosening or un disconnected by intentional positive turning of threading of the sections A and B due to back completion of one revolution between the sections 65 Aand B in the thread-loosening direction. 7.5 the string S in thf: thread loosening direction. lash in the drilling string and prevent unthread ' 2,118,821 ing of the joint when the string is turned under little torque to operate and control certain well tools. The circulation ?uid is free to pass down'-. wardly through the joint with a minimum resist ance and turbulence and is prevented from leak ing between the sections A and B by the ?uid pressure actuated packing ring 24. As the threads I0~ are not subjected to the tightening 3 . applied to the sections in the unthreading direc tion. v3. A safety joint comprising, two threadedly connected sections, an opening in one section, shoulders on the sections spaced from the open ing and cooperable to limit threading together of the sections, and a retractile detent on the other section related to the shoulders to cooperate with action of forward torque and compression the opening to yieldingly vresist unthreading of strains they do not become jammed or strained. When it becomes desirable or necessary to re lease or disconnect the safety joint the string 8 the sections when the shoulders are in coopera tion. . is turned in a direction to unthread the threads 10 4. A safety ‘joint comprising, two threadedly connected sections,-abutments on the sections limiting threading together of the sections, and Ill. The cooperation of the detent head 33 with the socket 3| may resist this rotative force until su?‘icient torque has built up in the string to overcome the action of the spring 35. In prac tice the degree of torque or rotative force neces when the abutments are in cooperation. 5. A safety joint comprising, a section having sary to release the detent 30 may be known or an opening, a section having a stem threaded in detent means remote from the abutments for 15 yieldingly resisting unthreading of the sections determined so that the safety joint may be read - the opening, shoulders on the sections limiting ily disconnected when desired. It is believed threading of the stem in the opening, there being a socket in the outer periphery of the stem and that it will be apparent how relative turning be spaced from said shoulders, and a retractile tween the sections A and B in a direction to un thread the threads Ill causes slippage between spring pressed detent on the ?rst mentioned sec the surface of the tapered detent head 33 and tion cooperating with the socket when the shoul 25 the wall of the tapered socket 3| which slippage ders are in cooperation to yielding'ly resist un threading of the stem from the socket. ' " results in retraction of the detent 30 in the open 6. A safety joint comprising, a section having ing 32. Following'retraction of the detent head ’ 33 from the socket 3! the sections A and B may an opening, a section having a stem threaded in the opening, opposing surfaces on the sections, be readily unthreaded. With the particular ar rangement of parts illustrated in the drawing shoulders on said surfaces extending longitudinal the stem l6 of the section A may be readily ly of the sections cooperable to limit threading of the stem in the socket, there being a socket threaded upwardly out of the opening 2|. Fol lowing the unthreading or disconnection of the ‘in the stern, and a spring pressed member on ‘sections A and B the portion of the drilling string S above the joint may be removed from the the ?rst mentioned section releasably cooperat~ 35 ing with the socket to yieldingly resist unthread ing of the stem from the socket and retractable well, together with one of the sections A or B. Having described only a typical preferred form ' from the socket by a substantial unthreading and application of my invention I do not wish to force. be limited or restricted to the speci?c details herein set forth, but wish to reserve'to myself 7. A safety joint comprising, a section- having 40 any variations or modi?cations that may appear an opening, a section having a stem threaded in the opening, opposing helical surfaces on the sec to those skilled in the art or fall within the scope of the following claims. Having described my invention, I claim: tions terminating in axially extending shoulders cooperable to limit threading of the stern in the socket, there being a tapered socket in the stem, 45 1. A safety joint comprising, two threadedly connected sections, an opening in one section, a a spring urged member on the ?rst named sec tion, and a tapered head on the member cooper atingwith the socket to resist unthreading of the spring pressed member carried by the other sec tion cooperating with the opening to offer sub. stantlal resistance to unthreading of the sec tions, the cooperating surface of the member and the wall of the opening being'pitched to torque'on the sections. cause retraction of the memberwhen torque of a certain magnitude is applied to the sections in the unthreading direction, and shoulders on the and a shiftable detent on one section at a point sections extending substantially longitudinally stem and retractile from the socket by a known 50 ‘ 8. A safety joint comprising, two threaded to gether sections, parts on the sections for de? nitely limiting threading together of the sections, 55 remote from said parts cooperating with the in relative positions where the member is receiv other section to offer resistance to unthreading of the sections and retractable by substantial torque applied to the sections'in the thread loos able in the opening. ening thereof to limit threading together of the sections _ 2. A safety joint comprising, two threadedly connected sections, shoulders on the sections en gageable to de?nitely limit threading together of the sections, an opening in one section spaced from the shoulders, and a spring pressed mem ber carried by the other section to cooperate with the opening when the shoulders are in en gagement to offer substantial resistance to un threading of the sections, the cooperating sur face of the member and the wall of the open ing being pitched to cause retraction of the member when torque of a certain magnitude is direction. - > - 9. A safety joint comprising, two threaded to 60 gether sections, axial shoulders on the sections limiting threading together of the sections, a re tractable detent on one section remote from said shoulders, and surfaces on the detent and said other section engaging to offer substantial re 65 sistance to unthreading of the sections when the shoulders are in cooperation and cooperable to cause retraction of the detent under a de?nite thread loosening torque on the sections. 70 LAWRENCE F. BAASH.