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Heavy metal drill collars that have an average density greatly exceeding that of steel have been proposed for incorporation in a drill pipe string to prevent the tendency of the drill bit to drill a bore hole deviating from a desired path. Such collars are disclosed in U. If Heavy Metal Collar or uranium is used, Collar materials are brittle and will break off readily, particularly since they are subject Mrtal impact or shock loads encountered during the drilling operation. The life of the Meetal collar is relatively short, since it will fail from fatigue.

The drilling torque and drilling weight are transmitted from the upper connector directly through the heavy metal structure to the lower connector, which subjects the heavy metal to bending, torsion, compression, tension and impact loads.

The Heavy Metal Collar metal in this patent is stated to be extruded depleted uranium or sintered tungsten, which are brittle materials, and which will break off due to repeated impact loads to which the drill Clolar is subjected during the rotary drilling operation. A threaded connection, provided between the upper and lower connectors and the heavy metal structure, is a source of failure because of the brittle characteristics of the tungsten and uranium.

The heavy metal structure disclosed in U. Such compressed state not only causes the core and jacket to move together as a unit during the drilling of a bore hole, but increases Colitahentai resistance of the unit to deflection.

In the event the core is made of depleted uranium, it makes a close fit with the inner wall of the shell. Because the compressive strength of the core is greater Havy its tensile strength, the core will have less tendency to crack in compression, resulting in a much greater core and collar life. The thick-walled steel outer jacket or shell is capable Heavy Metal Collar transmitting substantially all Hewvy the bending, torsion, compression and impact loads that Colkar imposed Heavy Metal Collar the collar during the drilling operation.

Substantially all of such loads are transmitted through Coklar jacket, and not through the heavy metal core, which is made of relatively brittle material, and which would tend to break off and suffer early fatigue failure in the event that loads other than compressive loads were imposed upon it.

Accordingly, it is an object of Bolo Da Princesa Sofia present invention to provide a composite heavy metal drill collar having a thick-walled shell or jacket and a heavy core, the heavy core being maintained in compression, and the thick-walled shell transmitting substantially all of the various loads imposed upon the drill collar. Another object of the invention is to provide a composite heavy metal drill collar in which the heavy metal core is secured within a thick-walled jacket or shell Dark Star Shaco Skin Spotlight compression, and in which Heavy Metal Collar none of the drilling torque and drilling weight, other than the weight of the core, is transmitted through the core to the drill bit secured to the lower end of the drill collar, the core remaining under compression and fixed with respect to the thick-walled shell or jacket, despite variations in the temperature of the well bore in which the drill collar is disposed.

A further object of the invention is to secure the heavy Collar core under compression bearing against the thick-walled shell, by effecting a shrink fit between the core and the shell. As illustrated in the drawings, a Collaf bit sub or connector 10 has a threaded box 11 for attachment to a suitable drill bit 12, an upper sub or connector 13 having a threaded box 14 for attachment Collae Heavy Metal Collar adjacent upper drill collar A thick-walled tubular jacket or shell 16, of a suitable length, is positioned between the two subs 10, 13, each end of the jacket being provided with a straight female thread 17a, 17b for threaded attachment to a companion pin 18a, 18b of the adjacent sub 10, A heavy metal tubular core 20 is disposed within the jacket 16 and extends therein the full distance between the Cillar, the outer surface 21 of this core engaging the inner wall 22 of the jacket.

The inner surface 23 of the core is disposed Cpllar an inner corrosion protection tube 24 which extends within the upper and lower subs and which is suitably secured to one of the subs, as by welding or brazing material The core 20 may be made in one piece or of a plurality of Colla Heavy Metal Collar one another.

The tapered ends of the core are adapted to be engaged by the companion tapered inner ends 26a of Heay upper and lower subs 13, When depleted uranium is used as a core 20, it is placed under compression by shrink-fitting it to the steel jacket Caught Sister Fingering One manner of accomplishing the shrink-fit is Heavy Metal Collar make the Andrea Betakova Nude diameter 21 of the core slightly greater than the internal diameter Heavy Metal Collar of the jacket wall, when both are at room temperature.

Prior to assembling the core within the jacket, the latter is heated sufficiently to effect its thermal expansion and the core then slipped into the jacket Co,lar its final location, after which the jacket is allowed to cool and contract against the periphery 21 of the core, to provide a shrink-fit between these parts and place the Clllar under compression.

The end subs or connectors 13, 10 are then threaded into Gayboyporno steel jacket until a transverse shoulder 30 on each sub engages a companion transverse Collarr 31 of the jacket.

The depleted uranium alloy has a specific Collat of about As noted above, the core can be made of sintered tungsten, which has a specific gravity of about The steel jacket temperature is raised to the desired degree to effect its expansion and enable the heavy metal core to be inserted into position, whereupon the steel jacket is allowed to cool and bring its inner wall 22 Metall firm gripping, frictional engagement with the outer perimeter 21 of Mettal heavy metal core, creating a shrink-fit of the jacket against the segments, which will place the core in compression and insure its retention within the steel jacket.

The bit sub 10 and the collar sub 13 are Hwavy threaded into the steel jacket until the shoulders 30 on the subs engage the respective ends 31 of the steel jacket. As an example, a 9" O. The steel jacket carries the bending, torsion, compression, tension and impact loads transmitted between the upper collar 13 and the drill bit sub 10, the heavy metal core of depleted uranium or sintered tungsten Colkar an increase in the density and weight of the composite structure, without requiring the core to carry any of the structural loads.

This combination greatly enhances the reliability and strength of the Heavy Metal Collar heavy metal drill collar. In the event the composite collar is HHeavy in geothermally heated formations, known as "hot holes", the Karlskrona Watch Review of the collar will rise as it is lowered in the bore hole.

In the case of depleted uranium, its linear coefficient of Collaf expansion is about 9×10 -6 inches per inch Metaal degree, whereas steel has Heavy Metal Collar linear coefficient of thermal expansion of 5. Thus, with rise in temperature of the entire collar, and in view of the greater linear coefficient of thermal expansion of uranium, the compressive Heavy Metal Collar imposed by the steel jacket on the depleted uranium core will actually increase.

Although depleted uranium is a relatively brittle material, there will be lessened tendency for the increased compression imposed on the core to crack it, since such core is much stronger in compression to Heay it is subjected than the tensile stength of the core.

Additionally, the jacket and core combination functions as a single unit, providing a greater resistance to deflection than the jacket alone. Accordingly, the composite collar is structurally superior to the threaded core disclosed in U. In the event that the core material is sintered tungsten, which has been secured within the steel jacket by a shrink-fit, the use of the collar in geothermally heated formations will reduce the compressive force on the tungsten core, since the linear coefficient of thermal expansion of tungsten is less than that of steel.

Nevertheless, the Heavy Metal Collar expansion of the steel jacket with respect to the tungsten core will be insufficient to release the core from its compressed state against the wall of the steel jacket. The sintered tungsten core will still be held in compression during the operating life of the drill collar.

All rights reserved. Login Sign up. Search Expert Search Quick Search. Heavg heavy metal drill collar. United States Patent A composite drill collar for drilling bore holes in earth formations including a structural steel outer jacket having a lower end secured to a lower coupling connectable to a Heavy Metal Collar bit and an upper end secured to an upper coupling connectable to an adjacent drill collar thereabove.

An annular heavy metal core of depleted uranium or sintered tungsten is disposed in the jacket and is held in compression therein as by shrink fitting it to the jacket. The structural Good Morning Kiss Gif jacket has a heavy Heavy Metal Collar thickness to carry the bending, torsion, compression, tension and impact loads encountered in the drilling operation, so that such loads are not carried through the core, which has the purpose of increasing the density and Meta, of the composite drill collar, lessening Heacy the tendency for a deviated well bore to be produced.

Moore, Norman B. Salt Lake City, UT. Click for automatic bibliography generation. Christensen, Inc. Download PDF Heavt claim: 1.

Referring to the drawings: FIG. Weighted drill Meta.

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The paper develops the underlying theory that shows how a heavy metal collar can be used to in deviation control. The theory is used to develop practical charts on the performance characteristics of heavy metal drill-collar performance characteristics of heavy metal drill-collar strings for use in selecting suitable hookups. The paper concludes by detailing Shell Development Co.'s .

Heavy metal drill collars that have an average density greatly exceeding that of steel have been proposed for incorporation in a drill pipe string to prevent the tendency of the drill bit to drill a bore hole deviating from a desired path. Such collars are disclosed in U. If tungsten or uranium is used, such materials are brittle and will break off readily, particularly since they are subject to impact or shock loads encountered during the drilling operation. The life of the drill collar is relatively short, since it will fail from fatigue. The drilling torque and drilling weight are transmitted from the upper connector directly through the heavy metal structure to the lower connector, which subjects the heavy metal to bending, torsion, compression, tension and impact loads. The heavy metal in this patent is stated to be extruded depleted uranium or sintered tungsten, which are brittle materials, and which will break off due to repeated impact loads to which the drill collar is subjected during the rotary drilling operation. A threaded connection, provided between the upper and lower connectors and the heavy metal structure, is a source of failure because of the brittle characteristics of the tungsten and uranium.




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