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Publication numberUS2982360 A
Publication typeGrant
Publication dateMay 2, 1961
Filing dateOct 12, 1956
Priority dateOct 12, 1956
Publication numberUS 2982360 A, US 2982360A, US-A-2982360, US2982360 A, US2982360A
InventorsByron B Morton, Rice Rutledge St John
Original AssigneeInt Nickel Co
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Protection of steel oil and/or gas well tubing
US 2982360 A
Abstract  available in
Previous page
Next page
Claims  available in
Description  (OCR text may contain errors)

May 2,1961 B. B. MORTON ET-AL 2,982,360


5; BYRONBENSON MORTON RUTLEDGE ST JOHN RICE INVENTOR'S BYQLQMSQQQ ATTORNEY Unite Patent Promotion OF STEEL OIL Ann/oRcXs YWELL'IIUBING Byron B. Morton, Elizabeth, N.J.,-a.1 Rutledge st. John Rice, Houston, Tex., assignors to The International Nickel Company, Inc.', New York, N.Y., a corporation ofDelaware Filed 0ct.1 2, *1956,;,Ser. :No. 615,494

4 Claims. (Cl. ire- 242) The present invention relates to steel oil and/orgas tubing and, more particularly, to theprotection .of steel art, serious problems and diffic'ultieshave heretofore x existed with respect towthe utilization of steel oiland/or gas well tubing which, while in service, is prone to failure caused by a mechanism involving hydrogen and/ or stress.- corrosion cracking. Hydrogen cracking or embrittlement can be' generally considered a spontaneous failure of metal as the result of atomichydrogen acting within interstitial voids :in the metal, i.e.,..discontinuities in the atomic structure of the metal, in the presence of some minimum stress. Stress-corrosion cracking has been defined as including any combined effect of stress and corrosion on the behavior of metals. Either type of failure may be generically categorized as a, type of brittle failure, ,the mechanism of. which can be considered as encompassing two stages. Inthe first stage, a crack or pit is developed in the metal and is continued by high stresses -and/or corrosion until the crack or pitcrack reaches a critical length with respect to the stresses acting normal to the length thereof. In the second stage, the crack is continued beyond the critical length until failure occurs.

The problems and difficulties have become particular- .ly acute anent deep, sour oil and/or gas wells. In such wells, hydrogen is activated in a manner whenceit comes into intimate contact with thesteel tubing. The hydrogen in atomic or nascent form penetrates the voids present in the metal and subsequently, because of its native activity, forms molecular hydrogen and thus causes an expansion in the volume of hydrogen in the void. This expansion, so caused, exerts a pressure of ever increasing proportion whereby the formation and lengtheningof cracks occur until pressure-causes complete fracture. The atomic hydrogen may be activated in several ways. For example, hydrogen sulphide in the fluids of sour wells reacts with the metal tubing whereby hydrogen is liberated in atomic form and then penetrates the metal. The process is facilitated .when a poisonous catalyst is formed, e.g., ferrous sulphide. The catalyst acts in a manner to encourage entrance or permeation of released atomic hydrogen into the metal. This is to say, a source of atomic hydrogen is catalytically directed into the metal. Another example of the manner in which hydrogen is introduced into wells is through well known acidizing procedures. The acid coming into contact with the steel tubing reacts therewith with the evolution of atomic hydrogen.

Conditions for the inducement of steel tubing to stresscorrosion cracking occur in a variety of ways. For example, internal stresses in the tubing metal resulting from improper heat treatment or cold work leave the metal in a condition susceptible to stress-corrosion cracking.

Patented May 2, 1961 Pit cracking or stress-corrosion in certain metals until failure fluids, cause pitting. cracking, continues occurs.

The mechanism of failure by cracking as referred to hereinabove is particularly pronounced, peculiarly enough, in steel tubing of high mechanical strength, e.g., steels having yield strengths of 80,000 p.s.i. (pounds per square inch) and up, and even more so in cold-worked high strength steels. With respect to hydrogen cracking particularly, experience has indicated that the minimum stress involved, in cracking as referred to hereinabove, apparently varies with the overall strength of the metal, the higher the strength of the metal the lower the minimum'of residual stress to bring about hydrogen cracking. Such high strength steels are generally used in commerical practice and are considered necessary for the purpose of resisting or counter-acting the effect of high tensile stresses, including both external and internal stresses, acting upon or within the metal. External stresses are generally the natural result of the use to which thesteel tubing is subjected during service whereas internal stresses primarily result from cold-working or other operations to which the steel is subjected prior to or in'use.

Endeavors directed to the use of low strength steels, e.g., yield strength of about 40,000 to 50,000 p.s.i., have not been entirely satisfactory. Such low strength steel tubing is somewhat susceptible to hydrogen and stresscorrosion cracking and there is a significant and undesirable sacrifice in mechanical strength, particularly in wells where high pressures and temperatures are encountered. Moreover, such steels are susceptible to formation of blisters which by rupturing can destroy portions or segments of the tube wall. It also has been proposed to subject both high strength and low strength steels to heatjtreatment to stress relieve the same, i.e., reduce internal stress caused by cold working. It is considered that such treatment involving relieving internal stress,

substantially reduces the number or size of the voids in the metal. However, it has been found that quenching processes employed after heat treatment set up a degree of internalstress. Moreover, it has been found generally necessary in practice that since the tubing must be straight in order to meet drift diameter requirements, cold-working procedures must be employed at various portions thereof to accomplish the same. Thus, additional internal stresses are set up and the voids in the metal are ever present and become larger at least with'respect to size. Furthermore, improper heat treatments can, as mentioned hereinbefore, be conducive to stress-corrosion cracking.

It has also been proposed heretofore to use plastic liners in steel oil well tubing for the protection thereof but'it has been found that plastic liners soften at well temperatures, e.g., 230 F. to 250 F., to such a detrimental degree that they pull loose and ball up even to the extent of stopping fluid flow. Some artisans have expressed the view that when voids occur in plastic liners the steel tubing cracks more readily than if the steel tubing were left completely exposed.

It might be well said that the problem is intensified and magnified in deep, sour wells where extremely high pressures and high temperatures, e.g., 15,000 p.s.i and about 350 F. prevail. Although many attempts were made to overcome the foregoing difficulties and other disadvantages, none, as far as we are aware, was entirely successful when carried into practice commercially on an industrial scale.

It has now been discovered that hydrogen and stresscorrosion cracking in steel tubing and particularly oil and/or gas well cold-worked steel tubing of high mechanical strength can be substantially minimized or re duced to a negligible extent by the use of special metal liners capable of protecting the steel from atomic hydrogen.

It is an object of the present invention to protect steel tubing from. hydrogen and/or stress-corrosion cracking.

Another object of the invention is to prevent failure of steel oil and/or gas well tubing in deep, sour, condensate wells caused by hydrogen and/ or stress-corrosion cracking.

The invention also contemplates providing a metal liner in combination with steel oil and/ or gas well tubing such that the steel tubing will not be subject to hydrogen and stress-corrosion cracking and will therefore be rendered capable of exhibiting a longer service life than when no such liner is used.

It is a further object of the invention to provide a metal liner capable of rendering atomic hydrogen into a form inert to steel oil and/ or gas well tubing.

The invention further contemplates protecting high strength, cold-worked steel oil and/or gas well tubing and more particularly, such steel tubing used in deep, sour wells of high pressures and temperatures from failure normally caused by hydrogen and stress-corrosion crack ing.

Other objects and advantages of the present invention will become more apparent from the description taken into conjunction with the accompanying drawing in which:

Figures 1 and 2 represent longitudinal sectional views and. Figure 3 an end view of Figure 1 showing the lined steel oil and/or gas well tubular structure provided in accordance with the present invention. In Figures 1 and 3 the interfacial zone between the tube and liner is shown on a greatly enlarged scale for purposes of illustration.

Generally speaking, the present invention contemplates protecting steel oil and/or gas tubing and particularly high strength, cold-worked oil and/or gas well tubing utilized in deep, sour Wells from failure caused or induced by hydrogen and/or stress-corrosion cracking by providing within the steel tubing, but in unbonded association therewith, a metal liner pervious to atomic hydrogen penetration, the metal liner being in mechanical contact with the steel tubing to form an interfacial zone therewith. It is important in accordance with the principles of the present invention that the outer surface of the protective liner be unbonded with respect to the inner surface of the steel tubing, i.e., the metallic liner is mechanically expanded or otherwise closely fitted to the inside diameter of the steel tubing throughout its entire length such that there is no metallic path for atomic hydrogen to pass into the steel tubing. Thus, there is a continuous void, i.e., interfacial zone, existing between the metal liner and steel tube. This feature of an interfacial zone in combination with the perviousness of the metal liner permits atomic hydrogen, which may be evolved from a reaction such as, for example, a reaction occurring between the liner and hydrogen sulfide, to preferentially reform into molecular hydrogen on the outside surface of the liner. In its molecular state hydrogen is substantially inert to the steel tubing at the temperatures within the wells. If the metal liner and steel tubing were in bonded form, e.g., clad or plated form wherein substantial diffusion occurs between the metal receiving a deposit and the deposited metal, permeation of the liner by atomic hydrogen would continue directly into the steel tubing and thus create the conditions which lead to cracking. The liner can be conveniently inserted within the steel tubing by procedures well known to those skilled in the art. For example, the liner can be expanded against the inner surface of the steel tubing using hydrostatic pressure.

In carrying the present invention into practice, it is preferred to employ metal liners containing metal from the group consisting of nickel, copper, and alloys "there- 4 of. Preferably, the nickel-copper alloys contain about 63% to nickel and about 25% to 30% copper. Small amounts of other elements including up to 2% iron, up to 2% manganese, up to 4% aluminum, up to 1% silicon and up to 0.3% carbon are contemplated within the scope of these alloys. Such liners, in addition to protecting steel tubing from hydrogen and/or stress-corrosion cracking failure, have a lower tensile modulus and higher thermal expansivity than steel and, as a result thereof, an excellent and desirable tight and permanent mechanical grip of the liner by the tubing is assured when expanded into place hydrostatically, when supporting a load in a well, and when heated by earth temperatures. Moreover, such liners are extremely corrosion-resistant to various corrosive media of well fluids, e.g., hydrogen sulfide of sour wells. It is also a preferred embodiment of the present invention where temperatures in excess of 500 F. and destructive sulfur are encountered in wells to employ metal liners pervious to atomic hydrogen and comprised of nickel-chromium-iron alloys containing nickel in amounts greater than about 50%, e.g., to chromium from about 10% to 35%, e.g., 12% to 15%, with iron being essentially the balance, e.g., 5% to 9% or 13%. Such alloys exhibit the desirable characteristic of affording substantial resistance to sulfur attack at well temperatures greater than 500 F. and are highly resistant to stress-corrosion attack normally attributable to the effect of chloride ions.

Turning to a discussion of the drawing and particularly Figure 2, there is shown a tubular structure comprised of an oil well steel tube 1 in mechanical contact, i.e., unbonded association, with a pervious metal liner 2. Reference numeral 3 indicates the interfacial zone existing between the steel tube and metal liner. This interfacial zone is shown on a greatly enlarged scale in Figures 1 and 3 for purposes of illustration. Thus, it will be understood that oil well steel tube 1 and metal liner 2 are engaged in mechanical contact such that there is formed therebetween a continuous void, i.e., an interfacial zone.

It is to be observed that the present invention provides special metal liners for the protection of steel oil and/or gas tubing from failure normally caused or induced by hydrogen and/or stress-corrosion cracking. The fact that the metal liners are in mechanical contact such that an interfacial zone is established therebetween provides a system for obviating or substantially preventing atomic hydrogen contact with the steel tubing. The establishment of an interfacial zone provides for the selective and preferential formation of molecular hydrogen on the outside surface of the metal liner. Hydrogen which heretofore contacted the steel tubing in destructive atomic or nascent state now, in accordance with the invention, contacts the tubing in harmless molecular form.

Furthermore, the invention provides for the protection of high strength, cold-worked steel oil and/or gas well tubing employed in deep, sour wells from hydrogen and/or stress-corrosion cracking. The metal liners described hereinbefore easily Withstand the high temperatures and pressures of deep wells. It is to be noted that since cold-worked steels of high strength, e.g., 80,000 psi, and containing small amounts of alloying elements, e.g., 0.75% to 1% chromium, 0.08% to 0.1% molybdenum, 0.5% to 1.25% manganese and 0.75% to 1.25 nickel, can be safely employed in oil and/or gas wells in accordance with the invention, no sacrifice in mechanical strength thereof is incurred as in the case of using low strength steels, e.g., steels having a yield strength of about 40,000 p.s.i. The voids present in the cold-workedsteel and which would have hitherto normally served as accumulators for atomic hydrogen no longer present a hazardous condition. Thus, maximum protection is coupled with maximum strength.

Moreover, the invention provides a new bi-metallic oil and/or gas well tubular structure having high overall strength and being comprised of an outer shell of coldworked and/or high strength steel and an inner shell in mechanical contact therewith and being comprised of the liner materials in accordance with the invention.

It is to be noted that the present invention is not to be confused with the more protection of steel tubing from general corrosive effects, for example, gradual corroding of metal through the formation of steel compounds which eventually become loose from the steel tubing and flake oif. Such corrosive activity which can be considered as general corrosion, although it is prevented by the present invention, is quite distinct from the problem of preventing hydrogen and/ or stress-corrosion or cracking failure.

Although the present invention has been described in conjunction with preferred embodiments, it is to be understood that modifications and variations may be resorted to without departing from the spirit and scope of the invention, as those skilled in the art will readily understand. Such modifications and variations are considered to be within the purview and scope of the invention and appended claims.

We claim: i

1. As a new article of manufacture, an improved oil and/or gas well tubular. structure capable of use under relatively high pressures and temperatures in deep, sour wells and adapted to resist failure caused or induced by provide for the selective and preferential formation of molecular hydrogen on the outside surface of said liner while in service, whereby detrimental atomic hydrogen contact with said steel shell is prevented.

2. The article of manufacture as described in claim 1 wherein the metal liner is comprised of a nickel-copper alloy containing about 63% to nickel and about 25% to 30% copper.

3. As a new article of manufacture, abi-metallic oil and/ or gas welltubular structure adapted to resist failure caused or induced by hydrogen and/or stress-corrosion cracking while in service, said tubular structure being comprised of an outer shell formed of a steel possessing a yield strength of at least about 80,000 pounds per square inch and an inner metal liner pervious to atomic hydrogen penetration, said liner being comprised of an alloy containing at least 50% nickel, from about 10% to about 35% chromium, and the balance essentially iron, said shell and liner being in mechanical contact such that there existsan' interfacial zone therebetween and to thereby provide for the preferential formation of molecular hydrogen on the outside surface of said liner while in service, whereby detrimental atomic hydrogen contact with said steel tubing is prevented a 4. The article of manufacture as described in claim 3 wherein the metal liner is comprised of an alloy containing about to nickel, about 12% to 15% chromium, and the balance essentially iron.

. References Cited in the file of this patent UNITED STATES PATENTS 714,903 Hinds Dec. 2, 1902 734,286 Thomson July 21, 1903 798,056 Nicholson Aug. 22, 1905 942,184 Persons Dec. 7, 1909 1,403,194 Ramage Jan. 10, 1922 1,835,426 Pier Dec. 8, 1931 1,872,011 Russell Aug. 16, 1932 1,890,436 Krauch et al. Dec. 6, 1932 1,949,109 Pier et al. Feb. 27, 1934 1,969,422 Pier Aug. 7, 1934 2,070,795 Liuaker Feb. 16, 1937 2,386,747 Ris Oct. 16,

2,516,689 France et al. July 25, 1950 Richardson Oct. 14, 1952

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US714903 *Feb 17, 1898Dec 2, 1902Robert LewisProcess of lining pipes.
US734286 *Jul 27, 1901Jul 21, 1903George ThomsonMetallic ingot or casting.
US798056 *Jun 10, 1904Aug 22, 1905Nat Tube CoCompound pipe or tube.
US942184 *Oct 14, 1908Dec 7, 1909James Otis PersonsMethod of lining pipes.
US1403194 *Jan 28, 1921Jan 10, 1922Alexander S RamageProducting of low-boiling-point saturated hydrocarbons from heavy hydrocarbon oils
US1835426 *Aug 28, 1928Dec 8, 1931Standard Ig CoDestructive hydrogenation of carbonaceous materials
US1872011 *Jul 2, 1928Aug 16, 1932Standard Ig CoImproved process for treating hydrocarbons
US1890436 *Apr 7, 1927Dec 6, 1932Standard Ig CoConversion of solid fuels and products derived therefrom or other materials into valuable liquids
US1949109 *Jun 13, 1930Feb 27, 1934Standard Ig CoReaction with hydrogen and in apparatus therefor
US1969422 *Nov 29, 1930Aug 7, 1934Standard Ig CoTreatment of coals, tars, mineral oils, and the like
US2070795 *Nov 28, 1934Feb 16, 1937Linaker Frederick WBoiler cleaner tube
US2386747 *Jan 27, 1944Oct 16, 1945Griscom Russell CoBimetal tube
US2516689 *Sep 13, 1947Jul 25, 1950Scovill Manufacturing CoBimetal tubing with ferruled ends
US2613958 *Mar 5, 1947Oct 14, 1952Brockway CompanyCoupling for double-walled pipes
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3461918 *Aug 29, 1966Aug 19, 1969Phillips Petroleum CoCorrosion protection
US3891394 *Apr 10, 1974Jun 24, 1975Love Oil Company IncCrystal generator to inhibit scale formation and corrosion in fluid handling systems
US3986553 *Jan 7, 1975Oct 19, 1976New Zealand Inventions Development AuthorityFluid sampling vessel
US4045591 *May 3, 1976Aug 30, 1977Rodco, Inc.Method of treating sucker rod
US4057108 *Nov 19, 1976Nov 8, 1977Shell Oil CompanyCompleting wells in deep reservoirs containing fluids that are hot and corrosive
US4184517 *Jun 5, 1978Jan 22, 1980Donald J. LewisLocked lined pipe and method for making same
US4198740 *Jul 24, 1978Apr 22, 1980The United States Of America As Represented By The United States Department Of EnergyMethod for forming or bonding a liner
US4359811 *Aug 20, 1980Nov 23, 1982The Halcon Sd Group, Inc.Method of coating or lining metals
US4741386 *Aug 25, 1986May 3, 1988Vertech Treatment Systems, Inc.Fluid treatment apparatus
US4759407 *Jun 24, 1987Jul 26, 1988Mitchell Supply, Inc.Inverted working barrel and seat and method of manufacturing the same
US4871024 *Aug 1, 1988Oct 3, 1989Baker Performance Chemicals Inc.Fluid for treatment of a subterranean well for enhancement of production
US4997040 *Oct 17, 1989Mar 5, 1991Baker Hughes IncorporatedCorrosion inhibition using mercury intensifiers
US6799632Aug 5, 2002Oct 5, 2004Intelliserv, Inc.Expandable metal liner for downhole components
US6830467Apr 30, 2003Dec 14, 2004Intelliserv, Inc.Electrical transmission line diametrical retainer
US6888473Jul 20, 2000May 3, 2005Intelliserv, Inc.Repeatable reference for positioning sensors and transducers in drill pipe
US6913093May 6, 2003Jul 5, 2005Intelliserv, Inc.Loaded transducer for downhole drilling components
US6929493Oct 2, 2003Aug 16, 2005Intelliserv, Inc.Electrical contact for downhole drilling networks
US6945802Nov 28, 2003Sep 20, 2005Intelliserv, Inc.Seal for coaxial cable in downhole tools
US6968611Nov 5, 2003Nov 29, 2005Intelliserv, Inc.Internal coaxial cable electrical connector for use in downhole tools
US6981546Jun 9, 2003Jan 3, 2006Intelliserv, Inc.Electrical transmission line diametrical retention mechanism
US6982384Sep 25, 2003Jan 3, 2006Intelliserv, Inc.Load-resistant coaxial transmission line
US6991035Sep 2, 2003Jan 31, 2006Intelliserv, Inc.Drilling jar for use in a downhole network
US6992554Nov 29, 2003Jan 31, 2006Intelliserv, Inc.Data transmission element for downhole drilling components
US7017667Oct 31, 2003Mar 28, 2006Intelliserv, Inc.Drill string transmission line
US7040003Mar 27, 2004May 9, 2006Intelliserv, Inc.Inductive coupler for downhole components and method for making same
US7053788Jun 3, 2003May 30, 2006Intelliserv, Inc.Transducer for downhole drilling components
US7064676Aug 19, 2003Jun 20, 2006Intelliserv, Inc.Downhole data transmission system
US7069999Feb 10, 2004Jul 4, 2006Intelliserv, Inc.Apparatus and method for routing a transmission line through a downhole tool
US7098767Mar 25, 2004Aug 29, 2006Intelliserv, Inc.Element for use in an inductive coupler for downhole drilling components
US7098802Dec 10, 2002Aug 29, 2006Intelliserv, Inc.Signal connection for a downhole tool string
US7105098Jun 6, 2002Sep 12, 2006Sandia CorporationMethod to control artifacts of microstructural fabrication
US7190280Jun 17, 2003Mar 13, 2007Intelliserv, Inc.Method and apparatus for transmitting and receiving data to and from a downhole tool
US7200070Aug 2, 2004Apr 3, 2007Intelliserv, Inc.Downhole drilling network using burst modulation techniques
US7224288Jul 2, 2003May 29, 2007Intelliserv, Inc.Link module for a downhole drilling network
US7243717Sep 20, 2004Jul 17, 2007Intelliserv, Inc.Apparatus in a drill string
US7261154Aug 13, 2004Aug 28, 2007Intelliserv, Inc.Conformable apparatus in a drill string
US7291303Dec 31, 2003Nov 6, 2007Intelliserv, Inc.Method for bonding a transmission line to a downhole tool
US7694402Aug 1, 2005Apr 13, 2010Packless Metal Hose, Inc.Method for forming a lined conduit
US7852232Feb 4, 2003Dec 14, 2010Intelliserv, Inc.Downhole tool adapted for telemetry
US7926160Aug 1, 2005Apr 19, 2011Packless IndustriesMethod of forming a lined tubular member
US8434207Apr 18, 2011May 7, 2013Packless IndustriesCorrugated conduit and method of expanding to form a lined tubular member
US20040104797 *Aug 19, 2003Jun 3, 2004Hall David R.Downhole data transmission system
US20040113808 *Dec 10, 2002Jun 17, 2004Hall David R.Signal connection for a downhole tool string
US20040145492 *Nov 29, 2003Jul 29, 2004Hall David R.Data Transmission Element for Downhole Drilling Components
US20040150532 *Jun 17, 2003Aug 5, 2004Hall David R.Method and apparatus for transmitting and receiving data to and from a downhole tool
US20040150533 *Feb 4, 2003Aug 5, 2004Hall David R.Downhole tool adapted for telemetry
US20040164833 *Mar 27, 2004Aug 26, 2004Hall David R.Inductive Coupler for Downhole Components and Method for Making Same
US20040164838 *Mar 25, 2004Aug 26, 2004Hall David R.Element for Use in an Inductive Coupler for Downhole Drilling Components
US20040219831 *Apr 30, 2003Nov 4, 2004Hall David R.Data transmission system for a downhole component
US20040221995 *May 6, 2003Nov 11, 2004Hall David R.Loaded transducer for downhole drilling components
US20040244964 *Jun 9, 2003Dec 9, 2004Hall David R.Electrical transmission line diametrical retention mechanism
US20040246142 *Jun 3, 2003Dec 9, 2004Hall David R.Transducer for downhole drilling components
US20050001735 *Jul 2, 2003Jan 6, 2005Hall David R.Link module for a downhole drilling network
US20050001736 *Jul 2, 2003Jan 6, 2005Hall David R.Clamp to retain an electrical transmission line in a passageway
US20050001738 *Jul 2, 2003Jan 6, 2005Hall David R.Transmission element for downhole drilling components
US20050039912 *Aug 13, 2004Feb 24, 2005Hall David R.Conformable Apparatus in a Drill String
US20050045339 *Sep 2, 2003Mar 3, 2005Hall David R.Drilling jar for use in a downhole network
US20050046590 *Sep 2, 2003Mar 3, 2005Hall David R.Polished downhole transducer having improved signal coupling
US20050067159 *Sep 25, 2003Mar 31, 2005Hall David R.Load-Resistant Coaxial Transmission Line
US20050074988 *Oct 2, 2003Apr 7, 2005Hall David R.Improved electrical contact for downhole drilling networks
US20050074998 *Oct 2, 2003Apr 7, 2005Hall David R.Tool Joints Adapted for Electrical Transmission
US20050082092 *Sep 20, 2004Apr 21, 2005Hall David R.Apparatus in a Drill String
US20050092499 *Oct 31, 2003May 5, 2005Hall David R.Improved drill string transmission line
US20050093296 *Oct 31, 2003May 5, 2005Hall David R.An Upset Downhole Component
US20050095827 *Nov 5, 2003May 5, 2005Hall David R.An internal coaxial cable electrical connector for use in downhole tools
US20050115717 *Nov 29, 2003Jun 2, 2005Hall David R.Improved Downhole Tool Liner
US20050118848 *Nov 28, 2003Jun 2, 2005Hall David R.Seal for coaxial cable in downhole tools
US20050173128 *Feb 10, 2004Aug 11, 2005Hall David R.Apparatus and Method for Routing a Transmission Line through a Downhole Tool
US20050212530 *Mar 24, 2004Sep 29, 2005Hall David RMethod and Apparatus for Testing Electromagnetic Connectivity in a Drill String
US20050285751 *Aug 2, 2004Dec 29, 2005Hall David RDownhole Drilling Network Using Burst Modulation Techniques
US20060021210 *Aug 1, 2005Feb 2, 2006Zifferer L RCorrugated conduit and method of expanding to form a lined tubular member
US20070022800 *Aug 1, 2005Feb 1, 2007Zifferer L RMethod and apparatus for forming a lined conduit
US20070169929 *Dec 31, 2003Jul 26, 2007Hall David RApparatus and method for bonding a transmission line to a downhole tool
US20100229996 *Feb 17, 2010Sep 16, 2010Packless Metal Hose, Inc.Method and apparatus for forming a lined conduit
DE1290388B *Sep 21, 1964Mar 6, 1969Calumet & Hecla CorpVerfahren zur Herstellung von Verbundrohren mit Innenrippen
WO2004013462A1Aug 4, 2003Feb 12, 2004Intelliserv IncAn expandable metal liner for downhole components
U.S. Classification166/242.4, 29/421.1, 196/133, 138/147, 422/7, 29/523, 166/902
International ClassificationE21B17/00
Cooperative ClassificationY10S166/902, E21B17/00
European ClassificationE21B17/00