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Publication numberUS2500276 A
Publication typeGrant
Publication dateMar 14, 1950
Filing dateDec 22, 1945
Priority dateDec 22, 1945
Publication numberUS 2500276 A, US 2500276A, US-A-2500276, US2500276 A, US2500276A
InventorsWalter L Church
Original AssigneeWalter L Church
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Safety joint
US 2500276 A
Abstract  available in
Images(1)
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Claims  available in
Description  (OCR text may contain errors)

March 14, 1950 w, CHURCH 2,500,276

SAFETY JOINT Filed Dec. 22, 1945 I i .2 I

. lbw vgVVENTOR,

Patented Mar. 14, 1950 UNITED STATES FATENT OFFICE SAFETY JOINT Walter L. Church, Houston, Tex.

Application December 22, 1945, Serial No. 636,898

1 Claim. 1

This invention relates to a safety joint.

An object. of the invention is to provide a safety joint which is specially adapted for connecting sections of an operating spring of pipe and which may be readily broken and separated in case it becomes necessary to do so.

The type of joint herein described has been specially designed for use in connecting string of pipe to a packer to be set in a well.

In the production of oil, or other fluids, from a well it is not. uncommon to set a packer in the well and to produce the fluid through the string of pipe by means or which the packer is set. It sometimes becomes desirable to collapse and remove the packer and the setting string of pipe from the well but in case the packer cannot be removed it is desirable to detach and remove the string of pipe.

In order that the string may be detached the safety joint hereindescribed is incorporated into the string above the packer so that when it is attempted to detach the string from the packer the safety joint will, break, and can be unscrewed, more easily than the couplings connecting the sections of they string above. This will in,- sure the ready removal of the entire operating string from the well in case the packer becomes stuck and cannot be removed.

It is another object of the invention to provide a safety joint of the character described that will not readily part, or unscrew, while the packer is being lowered into the well or during the manipulation of the string during the setting operation but which may be readily unscrewed and detached from the packer mechaanism beneath in case the packer becomes sanded up or for any reason stuck in the well so that it cannot be removed.

With the above and other objects in view the invention has particular relation to certain novel features of construction, arrangement of parts and use, an example of which is given in this specification and illustrated in the accompanying drawings, wherein:

Figure 1 is a side elevation, partly in section, of the safety joint showing the coupling members connected together.

Figure 2 is a fragmentary side elevation of the pin member and means for coupling said member to the string of pipe above; and

Figure 3 is a cross-sectional view taken on the line 3-3 of Figure 1.

Referring now more particularly to the drawings wherein like numerals of reference designumeral i designates an operating string of pipe which extends to the ground surface.

Screwed onto the lower end of the string there is a tubular reducing bushing 2, threaded onto the lower end of which there is a tubular outer nipple 3.

The numeral i designates a tubular pin member whose upper end fits snugly in the lower end of the nipple 3 and whose lower end is reduced in diameter forming the downwardly facing, external annular shoulder 5, and extending upwardly from this shoulder on opposite, sides are the longitudinal keyways 6, 6 which extend up the required distance. Above said keyways and countersunk into the enlarged upper end of the pin member are the annular seals '1, l which extend around said pin member and form seals with the nipple .i.

The lower end of the nipple is formed with the inwardly extending keys 8, '8. which extend into said keyways.

There is a tubular box member S3 which is provided with internal coarse threads [0 and said box member is internally blank above and beneath said threads.

The reduced portion of the pin member is provided with coarse external threads I! adapted to mesh with the threads it when the pin member is screwed home into the box member.

The pin member is externally blank above and beneath the threads H, said blank portions fitting into the blank portions of the box member when said coupling members are screwed together.

Countersunk into the pin member beneath its threads are the annular seal rings [2 which form seals with the box member when the pin member is screwed home therein. The threads Hi and H, in the present illustration, are left hand threads.

The box member has the slots, as l3, which are formed in the end of the box member which is adjacent the nipple 3. These slots have the laterally turned notches, as l3a, at their lower nate the same parts in each of the figures, the

ends, said notches, in the present illustration, being turned to the left and thus forming overhanging shoulders, as M, and the adjacent end of the nipple 3 is provided with the extended prongs l5, 15 which extend into the slots l3 but which are somewhat narrower than said slots, as shown in Figure 1, and which have lateral projections Isa extended into the notches l3a and forming the shoulders 16 arranged to interlock with the shoulders I 4. These shoulders are maintained in interlocking relation by means of a key l1? 3 which is shearable under abnormal, torsional strain.

In assembly the pin member 4 is screwed into the box member 9 to home position and the prongs l5 are then moved into the slots l3 and turned to interengage the shoulders It with shoulders M and the key ll is then countersunk into the adjacent ends of the nipple and box member, as shown in Figure 1. The nipple 3 is then screwed onto the reducing bushing 2 which is attached to the operating string of pipe I.

A well packer assembly may then be connected onto the threaded lower end [8 of the box member 9 and the packer mechanism let down into the [well bore to the desired location.

In order to set a type of packer assembly with which the safety joint is designed to be used the operating string must be turned to the right so as to release the packer assembly and allow it -to become engaged with the well casing and the operating string is then lowered to subject the packer to the weight of the operating string to expand the packer.

The key ii is of sumcient strength to withstand the torsional strain of this operation so that the safety joint will not be liable to become separated.

Later if it should be desired to remove the packer from the well an upward pull may be taken on the operating string and the shoulders l6, l4 being engaged the load will be assumed by them and the packer assembly may be removed from the well.

However, if the packer assembly is sanded up or stuck so that it cannot be removed by a straight pull the operating string of pipe may be turned to the right and the pin H sheared and the shoulders I S will then become disengaged from the shoulders l4 and upon an upward pull on the string of pipe the nipple 3 will move upwardly relative to the pin member 4 until the keys 8 engage the upper ends of the keyways B and the operating string may then be turned to the right and the threads ll disengaged from the threads l0 and the operating string may then be withdrawn from the well bore and thus recovered.

The drawings and description are illustrative merely while the broad principle of the invention will be defined by the appended claim.

What I claim is:

A safety joint for connecting sections of a string of pipe and comprising, a tubular nipple, a tubular pin member, one end of which is telescoped into and has a slidable splined connection with the nipple and whose other end is provided with external threads, a box member having internal threads into which said other end of the pin member is threaded, the end of the box member, adjacent the nipple, being formed with a slot having a laterally turned notch at its inner end, thus forming an overhanging shoulder and the adjacent end of the nipple being provided with an extended prong which extends into said slot and is narrower than the slot, a lateral projection on said prong which extends into said notch and which forms a shoulder, said shoulders being arranged to interlock to hold the adjacent ends of the nipple and box member in contact, frangible means initially locking the nipple and box member together against relative rotative movement when the projection extends into said notch, but which is shearable, under stress, to allow disengagement of said shoulders to permit relative longitudinal movement of the nipple and box member, and means arranged to prevent complete separation of the nipple and box member.

WALTER L. CHURCH.

REFERENCES CITED The following references are of record in the file of this patent.

UNITED STATES PATENTS Number Name Date 2,049,290 Burns et a1 July 28, 1936 2,113,821 Baash Apr. 12, 1938 2,189,697 Baker Feb. 6, 1940

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US2049290 *Jun 17, 1935Jul 28, 1936Lawrence P BaashDrilling safety joint
US2113821 *Feb 24, 1936Apr 12, 1938Lawrence F BaashSafety joint
US2189697 *Mar 20, 1939Feb 6, 1940Baker Oil Tools IncCement retainer
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2696367 *May 13, 1949Dec 7, 1954A 1 Bit & Tool CompanyApparatus for stabilizing well drills
US2698761 *Mar 19, 1951Jan 4, 1955Claypool Robbins MarshallProduction safety joint
US2712854 *May 17, 1949Jul 12, 1955Vera Neva CreightonAdjustable casing connector
US2832423 *Jun 1, 1954Apr 29, 1958Hall Noble HApparatus for removing stuck pipe from well bores
US2837166 *Apr 2, 1951Jun 3, 1958Inez Breaux HazelWell packer
US2893694 *Jan 27, 1958Jul 7, 1959Ross A McclintochTorque, releasing, safety joint for well tool strings
US2924433 *Feb 17, 1954Feb 9, 1960Dean W OsmunSafety joint
US2962097 *Apr 21, 1958Nov 29, 1960Otis Eng CoMeans for carrying out a removable flow tube program
US3028921 *Sep 11, 1958Apr 10, 1962Lebus Royalty CompanyMethod for drilling well bores
US3136367 *Jun 27, 1961Jun 9, 1964B & W IncLiner releasing tool
US3185092 *Jan 10, 1964May 25, 1965Hercules Powder Co LtdExplosive container with yieldable seal
US3664444 *May 11, 1970May 23, 1972Mobile Drilling Co IncAir drilling method using controlled split stream
US3870345 *Apr 3, 1973Mar 11, 1975Subsea Equipment Ass LtdTight underwater connector
US4064953 *Jun 22, 1976Dec 27, 1977Gulf Oil CorporationShear sub for drill string
US4154466 *Jan 3, 1977May 15, 1979Centron CorporationPipe section and coupling
US4258742 *Apr 3, 1979Mar 31, 1981Phillips Petroleum CompanyTapping apparatus
US5170847 *Mar 26, 1991Dec 15, 1992Union Oil Company Of CaliforniaHydraulic release oil tool
US5174375 *Apr 30, 1991Dec 29, 1992Union Oil Company Of CaliforniaFor conducting a fluid and running a linear into an underground borehole
US5566772 *Mar 24, 1995Oct 22, 1996Davis-Lynch, Inc.Telescoping casing joint for landing a casting string in a well bore
US6497295 *Jan 31, 2000Dec 24, 2002Specialised Petroleum Services LimitedTorque limiting tool
US6561227May 9, 2001May 13, 2003Shell Oil CompanyWellbore casing
US6575240Feb 24, 2000Jun 10, 2003Shell Oil CompanySystem and method for driving pipe
US6604763 *Apr 26, 2000Aug 12, 2003Shell Oil CompanyExpandable connector
US6631759Feb 12, 2002Oct 14, 2003Shell Oil CompanyApparatus for radially expanding a tubular member
US6631769Feb 15, 2002Oct 14, 2003Shell Oil CompanyMethod of operating an apparatus for radially expanding a tubular member
US6634431Oct 3, 2001Oct 21, 2003Robert Lance CookIsolation of subterranean zones
US6684947Feb 20, 2002Feb 3, 2004Shell Oil CompanyApparatus for radially expanding a tubular member
US6705395Feb 12, 2002Mar 16, 2004Shell Oil CompanyWellbore casing
US6712154Oct 18, 2001Mar 30, 2004Enventure Global TechnologyIsolation of subterranean zones
US6725919Sep 25, 2001Apr 27, 2004Shell Oil CompanyForming a wellbore casing while simultaneously drilling a wellbore
US6739392Sep 25, 2001May 25, 2004Shell Oil CompanyForming a wellbore casing while simultaneously drilling a wellbore
US6745845Dec 10, 2001Jun 8, 2004Shell Oil CompanyIsolation of subterranean zones
US6758278Sep 25, 2001Jul 6, 2004Shell Oil CompanyForming a wellbore casing while simultaneously drilling a wellbore
US6823937Feb 10, 2000Nov 30, 2004Shell Oil CompanyWellhead
US6857473Mar 7, 2002Feb 22, 2005Shell Oil CompanyMethod of coupling a tubular member to a preexisting structure
US6892819Sep 25, 2001May 17, 2005Shell Oil CompanyForming a wellbore casing while simultaneously drilling a wellbore
US6966370Feb 20, 2002Nov 22, 2005Shell Oil CompanyApparatus for actuating an annular piston
US6968618May 12, 2003Nov 29, 2005Shell Oil CompanyExpandable connector
US6976541Jan 22, 2003Dec 20, 2005Shell Oil CompanyLiner hanger with sliding sleeve valve
US7011161Oct 1, 2002Mar 14, 2006Shell Oil CompanyStructural support
US7021390Apr 18, 2003Apr 4, 2006Shell Oil CompanyTubular liner for wellbore casing
US7036582Oct 1, 2002May 2, 2006Shell Oil CompanyExpansion cone for radially expanding tubular members
US7040396Feb 20, 2002May 9, 2006Shell Oil CompanyApparatus for releasably coupling two elements
US7044218Oct 1, 2002May 16, 2006Shell Oil CompanyApparatus for radially expanding tubular members
US7044221Feb 20, 2002May 16, 2006Shell Oil CompanyApparatus for coupling a tubular member to a preexisting structure
US7048062Oct 1, 2002May 23, 2006Shell Oil CompanyMethod of selecting tubular members
US7048067Oct 31, 2000May 23, 2006Shell Oil CompanyWellbore casing repair
US7055608Apr 18, 2003Jun 6, 2006Shell Oil CompanyForming a wellbore casing while simultaneously drilling a wellbore
US7063142Feb 15, 2002Jun 20, 2006Shell Oil CompanyMethod of applying an axial force to an expansion cone
US7077211Jan 29, 2004Jul 18, 2006Shell Oil CompanyMethod of creating a casing in a borehole
US7077213Oct 1, 2002Jul 18, 2006Shell Oil CompanyExpansion cone for radially expanding tubular members
US7100684Dec 18, 2002Sep 5, 2006Enventure Global TechnologyLiner hanger with standoffs
US7100685Jun 13, 2003Sep 5, 2006Enventure Global TechnologyMono-diameter wellbore casing
US7108061Oct 25, 2002Sep 19, 2006Shell Oil CompanyExpander for a tapered liner with a shoe
US7108072Mar 5, 2003Sep 19, 2006Shell Oil CompanyLubrication and self-cleaning system for expansion mandrel
US7121337Jun 1, 2005Oct 17, 2006Shell Oil CompanyApparatus for expanding a tubular member
US7121352Jul 14, 2003Oct 17, 2006Enventure Global TechnologyIsolation of subterranean zones
US7146702Mar 7, 2005Dec 12, 2006Shell Oil CompanyMethod and apparatus for forming a mono-diameter wellbore casing
US7147053Aug 13, 2004Dec 12, 2006Shell Oil CompanyWellhead
US7159665Jul 19, 2002Jan 9, 2007Shell Oil CompanyWellbore casing
US7159667Feb 2, 2004Jan 9, 2007Shell Oil CompanyMethod of coupling a tubular member to a preexisting structure
US7168496Jun 26, 2002Jan 30, 2007Eventure Global TechnologyLiner hanger
US7168499Sep 10, 2004Jan 30, 2007Shell Oil CompanyRadial expansion of tubular members
US7172019Mar 7, 2005Feb 6, 2007Shell Oil CompanyMethod and apparatus for forming a mono-diameter wellbore casing
US7172021Nov 3, 2004Feb 6, 2007Shell Oil CompanyLiner hanger with sliding sleeve valve
US7172024Mar 31, 2003Feb 6, 2007Shell Oil CompanyMono-diameter wellbore casing
US7174964Jul 22, 2003Feb 13, 2007Shell Oil CompanyWellhead with radially expanded tubulars
US7185710Jun 13, 2003Mar 6, 2007Enventure Global TechnologyMono-diameter wellbore casing
US7195061Jun 2, 2005Mar 27, 2007Shell Oil CompanyApparatus for expanding a tubular member
US7195064Aug 13, 2003Mar 27, 2007Enventure Global TechnologyMono-diameter wellbore casing
US7198100Jun 2, 2005Apr 3, 2007Shell Oil CompanyApparatus for expanding a tubular member
US7201223Mar 1, 2005Apr 10, 2007Shell Oil CompanyMethod and apparatus for forming a mono-diameter wellbore casing
US7204007Mar 4, 2005Apr 17, 2007Shell Oil CompanyMethod and apparatus for forming a mono-diameter wellbore casing
US7216701Jun 1, 2005May 15, 2007Shell Oil CompanyApparatus for expanding a tubular member
US7231985Sep 10, 2004Jun 19, 2007Shell Oil CompanyRadial expansion of tubular members
US7234531Sep 19, 2002Jun 26, 2007Enventure Global Technology, LlcMono-diameter wellbore casing
US7240728Sep 25, 2001Jul 10, 2007Shell Oil CompanyExpandable tubulars with a radial passage and wall portions with different wall thicknesses
US7240729Jan 30, 2004Jul 10, 2007Shell Oil CompanyApparatus for expanding a tubular member
US7246667Sep 27, 2004Jul 24, 2007Shell Oil CompanyRadial expansion of tubular members
US7258168Jul 27, 2001Aug 21, 2007Enventure Global Technology L.L.C.Liner hanger with slip joint sealing members and method of use
US7270188Nov 22, 2002Sep 18, 2007Shell Oil CompanyRadial expansion of tubular members
US7275601Sep 28, 2004Oct 2, 2007Shell Oil CompanyRadial expansion of tubular members
US7290605Dec 10, 2002Nov 6, 2007Enventure Global TechnologySeal receptacle using expandable liner hanger
US7290616Jun 26, 2002Nov 6, 2007Enventure Global Technology, L.L.C.Liner hanger
US7299881Sep 27, 2004Nov 27, 2007Shell Oil CompanyRadial expansion of tubular members
US7308755Mar 4, 2005Dec 18, 2007Shell Oil CompanyApparatus for forming a mono-diameter wellbore casing
US7325602Sep 28, 2006Feb 5, 2008Shell Oil CompanyMethod and apparatus for forming a mono-diameter wellbore casing
US7350563Aug 14, 2002Apr 1, 2008Enventure Global Technology, L.L.C.System for lining a wellbore casing
US7350564May 20, 2005Apr 1, 2008Enventure Global Technology, L.L.C.Mono-diameter wellbore casing
US7357188Feb 23, 2000Apr 15, 2008Shell Oil CompanyMono-diameter wellbore casing
US7357190Sep 28, 2004Apr 15, 2008Shell Oil CompanyRadial expansion of tubular members
US7360591Apr 17, 2003Apr 22, 2008Enventure Global Technology, LlcSystem for radially expanding a tubular member
US7363690Mar 2, 2005Apr 29, 2008Shell Oil CompanyMethod and apparatus for forming a mono-diameter wellbore casing
US7363691Mar 3, 2005Apr 29, 2008Shell Oil CompanyMethod and apparatus for forming a mono-diameter wellbore casing
US7363984May 12, 2003Apr 29, 2008Enventure Global Technology, LlcSystem for radially expanding a tubular member
US7377326Aug 18, 2003May 27, 2008Enventure Global Technology, L.L.C.Magnetic impulse applied sleeve method of forming a wellbore casing
US7383889Nov 12, 2002Jun 10, 2008Enventure Global Technology, LlcMono diameter wellbore casing
US7398832May 5, 2003Jul 15, 2008Enventure Global Technology, LlcMono-diameter wellbore casing
US7404444Aug 18, 2003Jul 29, 2008Enventure Global TechnologyProtective sleeve for expandable tubulars
US7410000May 20, 2005Aug 12, 2008Enventure Global Technology, Llc.Mono-diameter wellbore casing
US7416027Aug 13, 2002Aug 26, 2008Enventure Global Technology, LlcAdjustable expansion cone assembly
US7419009Mar 18, 2005Sep 2, 2008Shell Oil CompanyApparatus for radially expanding and plastically deforming a tubular member
US7424918Aug 18, 2003Sep 16, 2008Enventure Global Technology, L.L.C.Interposed joint sealing layer method of forming a wellbore casing
US7434618Jun 1, 2005Oct 14, 2008Shell Oil CompanyApparatus for expanding a tubular member
US7438132Apr 23, 2003Oct 21, 2008Shell Oil CompanyConcentric pipes expanded at the pipe ends and method of forming
US7438133Feb 26, 2004Oct 21, 2008Enventure Global Technology, LlcApparatus and method for radially expanding and plastically deforming a tubular member
US7503393Jan 26, 2004Mar 17, 2009Enventure Global Technology, Inc.Lubrication system for radially expanding tubular members
US7513313Sep 22, 2003Apr 7, 2009Enventure Global Technology, LlcBottom plug for forming a mono diameter wellbore casing
US7516790Jan 9, 2003Apr 14, 2009Enventure Global Technology, LlcMono-diameter wellbore casing
US7530607 *Jan 6, 2006May 12, 2009Luft Peter AQuick torque coupling
US7552776Oct 13, 2005Jun 30, 2009Enventure Global Technology, LlcAnchor hangers
US7559365Nov 12, 2002Jul 14, 2009Enventure Global Technology, LlcCollapsible expansion cone
US7571774Aug 18, 2003Aug 11, 2009Eventure Global TechnologySelf-lubricating expansion mandrel for expandable tubular
US7603758Feb 14, 2001Oct 20, 2009Shell Oil CompanyMethod of coupling a tubular member
US7665532Oct 19, 2007Feb 23, 2010Shell Oil CompanyPipeline
US7712522Apr 3, 2007May 11, 2010Enventure Global Technology, LlcExpansion cone and system
US7739917Aug 18, 2003Jun 22, 2010Enventure Global Technology, LlcPipe formability evaluation for expandable tubulars
US7740076Mar 4, 2003Jun 22, 2010Enventure Global Technology, L.L.C.Protective sleeve for threaded connections for expandable liner hanger
US7775290Apr 15, 2004Aug 17, 2010Enventure Global Technology, LlcApparatus for radially expanding and plastically deforming a tubular member
US7793721Mar 11, 2004Sep 14, 2010Eventure Global Technology, LlcApparatus for radially expanding and plastically deforming a tubular member
US7819185Aug 12, 2005Oct 26, 2010Enventure Global Technology, LlcExpandable tubular
US7886831Aug 6, 2007Feb 15, 2011Enventure Global Technology, L.L.C.Apparatus for radially expanding and plastically deforming a tubular member
US7918284Mar 31, 2003Apr 5, 2011Enventure Global Technology, L.L.C.Protective sleeve for threaded connections for expandable liner hanger
US7938177 *Jan 19, 2009May 10, 2011Express Energy Services Operating, LPCirculating sub tool for dispensing and circulating fluid in a well bore
US8794677 *Oct 10, 2008Aug 5, 2014Crystal Engineering CorporationInterchangeable fitting system and method
US20100090456 *Oct 10, 2008Apr 15, 2010Crystal Engineering CorporationInterchangeable fitting system and method
US20100232887 *Mar 15, 2010Sep 16, 2010University Of KansasBreakaway casing connection
US20130009396 *Dec 16, 2010Jan 10, 2013Uponor Innovation AbConnection Between Two Pipe Parts
USRE31123 *Jan 14, 1980Jan 11, 1983Centron CorporationPipe section and coupling
DE1155945B *Aug 9, 1955Oct 17, 1963Dalmine SpaRohrverschraubung fuer unter Druck stehende Fluessigkeiten oder Gase
Classifications
U.S. Classification285/2, 285/86, 285/402, 166/240, 285/148.19, 285/355, 285/922, 285/91, 285/3, 166/181
International ClassificationE21B17/06
Cooperative ClassificationE21B17/06, Y10S285/922
European ClassificationE21B17/06