EP0238337A2 - Thermomechanische Stromversorgungsvorrichtung für ein Werkzeug im Bohrloch - Google Patents

Thermomechanische Stromversorgungsvorrichtung für ein Werkzeug im Bohrloch Download PDF

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Publication number
EP0238337A2
EP0238337A2 EP87302375A EP87302375A EP0238337A2 EP 0238337 A2 EP0238337 A2 EP 0238337A2 EP 87302375 A EP87302375 A EP 87302375A EP 87302375 A EP87302375 A EP 87302375A EP 0238337 A2 EP0238337 A2 EP 0238337A2
Authority
EP
European Patent Office
Prior art keywords
housing
downhole tool
electrical
power supply
disposed
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP87302375A
Other languages
English (en)
French (fr)
Other versions
EP0238337B1 (de
EP0238337A3 (en
Inventor
Ronnie Joe Buchanan
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Halliburton Co
Original Assignee
Halliburton Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Halliburton Co filed Critical Halliburton Co
Publication of EP0238337A2 publication Critical patent/EP0238337A2/de
Publication of EP0238337A3 publication Critical patent/EP0238337A3/en
Application granted granted Critical
Publication of EP0238337B1 publication Critical patent/EP0238337B1/de
Expired legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02G—HOT GAS OR COMBUSTION-PRODUCT POSITIVE-DISPLACEMENT ENGINE PLANTS; USE OF WASTE HEAT OF COMBUSTION ENGINES; NOT OTHERWISE PROVIDED FOR
    • F02G1/00—Hot gas positive-displacement engine plants
    • F02G1/04—Hot gas positive-displacement engine plants of closed-cycle type
    • F02G1/043—Hot gas positive-displacement engine plants of closed-cycle type the engine being operated by expansion and contraction of a mass of working gas which is heated and cooled in one of a plurality of constantly communicating expansible chambers, e.g. Stirling cycle type engines
    • F02G1/0435—Hot gas positive-displacement engine plants of closed-cycle type the engine being operated by expansion and contraction of a mass of working gas which is heated and cooled in one of a plurality of constantly communicating expansible chambers, e.g. Stirling cycle type engines the engine being of the free piston type
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B41/00—Equipment or details not covered by groups E21B15/00 - E21B40/00
    • E21B41/0085—Adaptations of electric power generating means for use in boreholes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02G—HOT GAS OR COMBUSTION-PRODUCT POSITIVE-DISPLACEMENT ENGINE PLANTS; USE OF WASTE HEAT OF COMBUSTION ENGINES; NOT OTHERWISE PROVIDED FOR
    • F02G2243/00—Stirling type engines having closed regenerative thermodynamic cycles with flow controlled by volume changes
    • F02G2243/02—Stirling type engines having closed regenerative thermodynamic cycles with flow controlled by volume changes having pistons and displacers in the same cylinder
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02G—HOT GAS OR COMBUSTION-PRODUCT POSITIVE-DISPLACEMENT ENGINE PLANTS; USE OF WASTE HEAT OF COMBUSTION ENGINES; NOT OTHERWISE PROVIDED FOR
    • F02G2254/00—Heat inputs
    • F02G2254/90—Heat inputs by radioactivity
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02G—HOT GAS OR COMBUSTION-PRODUCT POSITIVE-DISPLACEMENT ENGINE PLANTS; USE OF WASTE HEAT OF COMBUSTION ENGINES; NOT OTHERWISE PROVIDED FOR
    • F02G2280/00—Output delivery
    • F02G2280/10—Linear generators

Definitions

  • This invention relates generally to downhole tools energized by self-contained power supply apparatus and in particular to an electrical power supply apparatus for use in a downhole tool.
  • various activities need to be performed downhole. For example, downhole pressure and temperature readings need to be taken when conducting a drill stem test, and perforating guns need to be activated when perforating a casing prior to fracturing a formation.
  • These two specific operations, as well as many others, are performed by tools which need to be energized when the tools are at their downhole locations.
  • This energization is typically electrical energization, at least during some phase of the downhole operation.
  • wireline energization technique One shortcoming of the wireline energization technique is the relative difficulty in using the wireline rather than nerely using a "slick line" or retaining cable, which relative difficulty is well recognized in the industry. Additionally, because of the length of the wireline, electrical losses occu l which would not occur if the power supply were wholly contained within the downhole tool. Finally, the requirement of a wireline does not lend itself to long-term tests, as the wireline truck or skid and power supply must remain at the well site. Moreover, the presence of a wireline or any cable in the well bore prohibits quickly closing off the well in an emergency unless one is willing to cut the wireline or cable and then "fish" it out at a later time.
  • battery packs overcome the two aforementioned shortcomings of wireline energization, the battery packs have relatively limited operating lives and electrical capacities whereby the operation of the downhole tool, both as to how much can be driven by a battery pack and as to how long energization can be sustained, is limited.
  • the battery packs When testing multiple parameters or conducting a long-term test, e.g., weeks or months, such limitations become particularly apparent.
  • more batteries can be added to provide more capacity, such additional batteries at some point can no longer be accommodated because of the size constraints which are imposed upon all downhole tools by the size of the well bore and other known factors.
  • batteries can be replaced so that operations can be continued, such replacement requires a trip of the pipe string in which the battery packs are incorporated, out of and back into the well bore, thereby increasing the expense of the operation.
  • battery packs also have limitations as to the types of wells in which they can be readily used; this is specifically referring to deep wells (e.g., wells from two to five miles deep) because of the high pressures and temperatures which are encountered in these wells and which can detrimentally affect the chemical operations within the battery cells.
  • a power supply apparatus for an oil or gas well downhole tool having a system requiring energy from said power supply and having a receptacle for receiving said power supply, comprising: housing means for being received within the receptacle of the downhole tool; a fuel .capsule removably retained inside said housing means, .Stlid fuel capsule including means for generating thermal energy; Stirling cycle engine means, disposed in said housing means, for converting said thermal energy to mechanical motion; conversion means, disposed in said housing means, for converting said mechanical motion to energy usable by the system within the downhole tool; and connecting means, communicating externally of said housing means, for connecting said energy from said conversion means to the system of the downhole tool.
  • the invention also includes a method of energizing an electrical circuit contained in a downhole tool used in an oil or gas well, comprising: inserting a fuel capsule into a housing in heat transfer relationship with a Stirling cycle engine retained in said housing, said fuel capsule including a radioisotope; inserting said housing into the downhole tool; and electrically connecting the electrical circuit to a linear alternator disposed in said housing and mechanically connected to said Stirling cycle engine.
  • the present invention can combine nuclear, mechanical and electrical aspects into an overall combina tion having the following features and advantages: very high power density, stable operation, long operating life, and minimal moving parts which neither rotate nor require a lubricating system or valves.
  • the apparatus of the present invention can be simple, reliable and relatively inexpensive.
  • a downhole tool comprising a power supply including a housing; thermal energy source means, disposed in the housing, for generating thermal energy; an electrical energy generator disposed in the housing; external combustion engine means, disposed within the housing, for actuating the electrical energy generator in response to the thermal energy from the thermal energy source means; and means for connecting the electrical energy generator with an electrical circuit, disposed in another housing in which the first-mentioned housing is disposed, for performing a function in a downhole environment of a well in response to electrical energization from the electrical energy generator.
  • the thermal energy source means includes a radioisotope
  • the external combustion engine means includes a Stirling cycle engine
  • the electrical energy generator includes a linear alternator.
  • the step of inserting the housing into the downhole tool includes retaining the housing within a receptacle region having a diameter of approximately 25.4mm (one inch) and a length of not greater than approximately 610mm (twenty-four inches).
  • FIG.1 Schematically illustrated in FIG.1 is a well 2, particularly an oil or gas well, at the mouth of which is disposed a conveyancing means 4, such as a winching system of a more complex design than is schematically shown in FIG. 1, for lowering and raising a downhole tool 6.
  • Conveyancing means 4 is also contemplated to include a pipe or tuning string in which downhole tool 6 is incorporated or disposed.
  • the downhole tool 6 has an electrical circuit or system 8 for performing a function of whatever type might be needed in the downhole environment of the well 2.
  • Specific examples of the downhole tool 6, but not by way of limitation, are an electronic pressure and temperature gauge or an electrically-actuated perforating gun.
  • the electrical.circuit 8 is disposed or contained in a suitable housing 10 of a type known to the art.
  • the housing 10 has a receptacle 12 for receiving a power supply 14 which provides the electrical energization to which the electrical circuit 8 responds, thereby enabling the function to be performed.
  • the power supply 14 is a radioisotope thermomechanical electrical generator (thus the label R.T.E.G. used in FIG. 1).
  • the receptable 12 is sized to accommodate the size of the power supply 14 subsequently more particularly specified.
  • the size specifications or limitations are important in the preferred embodiment of the present invention in that they provide a more compact self-contained power supply than is provided by battery packs known to me for similar applications. This is of considerable significance to a downhole tool designer who must work within some absolute size constraints imposed by the size of the well bore, the tubing disposed in the well bore, and the formation with which the tool is to be used, for example.
  • the power supply 14 includes housing means 16 for being received within the receptacle 12 of the housing 10 of the downhole tool 6.
  • the power supply 14 also includes thermal energy source means 18, disposed in the housing 16, for generating thermal energy which powers an external combustion engine means 20, also disposed within the housing 16, for converting the thermal energy into mechanical motion.
  • the external combustion engine means 20 is defined as a Stirling cycle engine having a driving output coupled to conversion means 22, also disposed within the housing 16, for converting the mechanical motion from the engine 20 to energy usable by the system 8 within the downhole tool 6.
  • this energy is, of course, electrical energy; however, other suitable output energies could be derived in correspondence with the nature of some other type of functional system which might be used in the downhole tool 6 in place of the electrical system 8.
  • transfer means for transferring thermal energy from the thermal energy source 18 to the engine 20 and means for connecting the output from the conversion means 22 to the system 8.
  • the housing 16 of the preferred embodiment is defined by a tubular member 24 having a cylindrical side wall 25 with a maximum outer diameter of, preferably, not greater than approximately 2.54cm (one inch) and an outer length of, preferably, not greater than approximately 61cm (twenty-four inches). More broadly, the maximum outer diameter is less than the inner diameter of the downhole tool 6 and the outer length is less than the length of the downhole tool so.that the housing 16, and thus the entire power supply 14, can be fully received entirely within the downhole tool 16.
  • the specific dimensions are particularly advantageous because they are significantly less than typical dimensions of battery packs which are now -a:commodated in downhole tool designs. Thus, with the present invention a more compact overall downhole tool is provided, thereby saving material and fabrication costs.
  • this opening 26 is defined through an end wall 28 of the tubular member 24.
  • This end wall 28 is disposed transversely to the cylindrical side wall 25 of the tubular member 24.
  • the opening 26 is closable by means of a closure cap 30 which is connected by mating threads within the opening 26. Because the thermal energy source 18 is received in this end of the tubular member 24, the interior surface of the end wall 28 and this portion of the tubular member 24 are lined with a suitable insulation material 32.
  • the tubular member 24 can be constructed in two sections which are threadedly connected as at reference numeral 33 shown in FIG. 2. With this construction no end opening 26 and closure cap 30 are needed so that the end wall 28 is continuous across the entire end area of that portion of the tubular member 24; this permits better insulating of the thermal energy source 18.
  • Other suitable constructions of the housing 16 and other suitable techniques for inserting and removing the thermal energy source 18 can, of course, also be used as would be well known in the art.
  • the other end of the tubular member 24 has an end wall 34 disposed transversely to the side wall 25. This end wall 34 is spaced linearly from the end wall 28 at the opposite end of the cylindrical side wall 25.
  • the thermal energy source 18, movable into and out of the housing 16 through the opening 26 is in the preferred embodiment a unitary member constructed in the form of a fuel capsule 36 made of, at least in part, a suitable radioisotope having a half-life sufficient to provide a sufficiently long-lived primary energy source for the power supply 14 so that power source replacements are not needed once an operation commences, thereby making extra trips out of and into the well unnecessary.
  • a suitable radioisotope having a half-life sufficient to provide a sufficiently long-lived primary energy source for the power supply 14 so that power source replacements are not needed once an operation commences, thereby making extra trips out of and into the well unnecessary.
  • There is a sufficient quantity of the radioisotope in the fuel capsule 36 so that the power supply 14 has an overall electrical output within the range of approximately 0.5 watt to approximately 2.5 watts.
  • the electrical output from the conversion means 22 need be only something less than approximately one watt, which output is ultimately the result of the capacity of the radioisotope primary power source contained in the fuel capsule 36.
  • the fuel capsule 36 is removable from the housing 16 independently of any of the other components of the power supply 14 so that this primary fuel source can be readily replaced if ultimately needed.
  • the fuel capsule 36 is surrounded by a suitable heat transfer medium, such as a heat pipe, defining the transfer means for transferring the thermal energy generated by the radioactive decay of the radioisotope within the fuel capsule 36 to the external combustion engine 20.
  • the external combustion engine means 20 of the preferred embodiment includes a Stirling cycle engine.
  • the Stirling cycle is a well known thermodynamic cycle and various engines operating in accordance with this cycle are well known.
  • these engines have two pistons: one of which is referred to as a displacer for moving a working gas between hot and cold chambers, and the other of which is referred to as a power piston for providing a mechanical motion output.
  • the movements of these pistons are in response to thermal energy, or heat, applied from a suitable source, which in the preferred embodiment of the present invention is the radioisotope of the fuel capsule 36. As shown in FIG.
  • the Stirling cycle engine is disposed adjacent the fuel member 36 so that the heat generated by the radioactive decay of the radioisotope in the fuel capsule 36 is transferred to the Stirling cycle engine through the heat transfer medium within the volume surrounding the capsule 36.
  • the Stirling cycle engine is specifically identified by the reference numeral 38, and the mechanical motion is provided through a coupling member 40, such as the piston rod of the power piston known to be contained within the Stirling cycle engine 38.
  • the conversion means 22 is connected to the coupling member 40 so that the conversion means-22 is actuated by that motion, which motion is derived in response to the thermal energy from the thermal energy source means 18.
  • the conversion means 22 is an electrical energy generator (specifically identified as a linear alternator 42) which generates a voltage across two terminals 44, 46.
  • this form of the conversion means 22 includes a stator with which the two terminals 44, 46 are associated and a movable member connected to the coupling member 40 so that relative movement between the stator and the movable member is achieved when the Stirling engine 38 operates.
  • the stator is fixed in a stationary manner relative to the housing 16 and the movable member is fixed relative to the power piston within the Stirling engine 38 so that movement of the power piston moves the movable member relative to the stator.
  • This relative movement generates the electrical voltage by the electromagnetic relationship between the stator and the movable member as is well known in linear alternators.
  • the Stirling engine 38 and the linear alternator 42 are constructed so that this relative movement is constrained to not more than approximately 3.2mm (1/8 inch), but also so that such limited displacement still generates an electrical output sufficient to provide power within the range between approximately 0.5 watt and approximately 2.5 watts.
  • the linear alternator 42 is disposed on the side of the Stirling cycle engine 38 opposite the fuel member 36.
  • the electrical output from the linear alternator 42 which is provided across the terminals 44, 46, is communicated externally of the housing 16 by the connecting means, schematically illustrated in FIG. 2 as including conductive members 48, 50 and output contacts or terminals 52, 54.
  • These elements can be included in a single unitary member which provides both mechanical and electrical coupling of a suitable type for connecting with the circuit 8 to be energized by the power supply 14.
  • This connecting, or coupling, means is preferably connected to or through the end wall 34 of the housing 16 so that the connection is made within the confines of the maximum outer diameter of the tubular member 24.
  • the above-described preferred embodiment of the apparatus defining the power supply 14 is also comprehended within a method of energizing an electrical circuit contemplated by the present invention.
  • This method comprises inserting the fuel capsule 36 into the housing 16 in heat transfer relationship with the Stirling cycle engine 38, inserting the housing 16 into the downhole tool 6, and electrically connecting the electrical circuit of the downhole tool to the linear alternator 42.
  • the importance of this method is in utilizing the fuel capsule 36, having the radioisotope, with a Stirling cycle engine in a downhole tool so that an improved technique of energizing such a downhole tool is provided.
  • this method includes within the step of inserting the housing into the downhole tool the step of retaining the housing within a receptacle region having a diameter of approximately 2.54cm (one inch) and a length of not greater than approximately 61cm (twenty-four inches).
  • This method also comprises generating, at the output of the linear alternator 42 and in response to the radioisotope in the fuel capsule 36, an electrical output within the previously defined range of between approximately 0.5 watt and approximately 2.5 watts for application to the electrical circuit of the downhole tool.
  • This power generating is achieved in the preferred embodiment of the method in conjunction with constraining the movement of the movable member of the linear alternator 42 relative to the stator of the linear alternator 42 to not more than approximately 3.2mm (1/8 inch).
  • the radioisotope thermomechanical electrical generator of the preferred embodiment power supply 14 utilizes the energy released by the decay of the radioisotope within the fuel capsule 36 to provide heat to operate the Stirling engine 38 which will in turn drive the linear alternator 42 to provide a suitable electrical power output, such as in the specific embodiment an output of less than approximately one watt of AC or DC power for use in oil field instrumentation.
  • the power supply 14 will operate for a long period of time, depending upon the half-life of the radioisotope, and over a wide temperature range, from less than 0°C to over 200°C because of the constant energy output of the radioactive source.
  • Additional or alternative specific desing criteria contemplated for a specific implementation of the preferred embodiment includes an approximately 2.54cm (one-inch) maximum outer diameter and a maximum length of preferably not greater than approximately 6lcm (two-feet) an approximately 13mm (1/2 inch) diameter by approximately 15cm (six inch) length well at the heat source end of the housing for receiving a similarly sized fuel capsule, a suitable heat transfer mechanism, such as a heat pipe, to transfer heat from the radioisotope capsule to the head of the Stirling engine with suitable insulation as needed in the side wall and end of this section of the housing, a threaded end cap in a 13mm (1/2 inch) well to secure the fuel capsule in place and to provide maximum thermal contact between the surfaces of the fuel capsule and the well, an overall efficiency of 15% or better at 200°C, isolated electrical output terminals across which approximately 10-20 vac rms are provided from DC to as high a frequency as possible with a power output between approximately 0.5 watt and approximately 2.5 watts, and with a power drain two

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  • Engineering & Computer Science (AREA)
  • Geology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Fluid Mechanics (AREA)
  • Environmental & Geological Engineering (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
  • Drilling And Boring (AREA)
  • Portable Nailing Machines And Staplers (AREA)
EP19870302375 1986-03-20 1987-03-19 Thermomechanische Stromversorgungsvorrichtung für ein Werkzeug im Bohrloch Expired EP0238337B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US84192486A 1986-03-20 1986-03-20
US841924 1986-03-20

Publications (3)

Publication Number Publication Date
EP0238337A2 true EP0238337A2 (de) 1987-09-23
EP0238337A3 EP0238337A3 (en) 1989-03-08
EP0238337B1 EP0238337B1 (de) 1992-08-26

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Application Number Title Priority Date Filing Date
EP19870302375 Expired EP0238337B1 (de) 1986-03-20 1987-03-19 Thermomechanische Stromversorgungsvorrichtung für ein Werkzeug im Bohrloch

Country Status (5)

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EP (1) EP0238337B1 (de)
CA (1) CA1320481C (de)
DE (1) DE3781293T2 (de)
ES (1) ES2033832T3 (de)
SG (1) SG114092G (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0500303A2 (de) * 1991-02-20 1992-08-26 Halliburton Company Stromversorgungsvorrichtung zur Anwendung im Bohrloch
DE4447226A1 (de) * 1994-12-30 1996-07-04 Heinz B Mader Mehrteiliger Transportcontainer
WO2012055392A3 (de) * 2010-10-30 2013-04-04 Technische Universität Bergakademie Freiberg Meisseldirektantrieb für werkzeuge auf basis einer wärmekraftmaschine
EP2682689A1 (de) * 2012-06-05 2014-01-08 Rohöl - Aufsuchungs AG Erzeugung elektrischer Energie aus Erdwärme

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3563028A (en) * 1968-07-22 1971-02-16 Mc Donnell Douglas Corp Implantable radioisotope-fueled stirling engine
US3666030A (en) * 1971-02-21 1972-05-30 Dresser Ind Electrical energy supply for well tools
US3876471A (en) * 1973-09-12 1975-04-08 Sun Oil Co Delaware Borehole electrolytic power supply
US3996749A (en) * 1974-05-07 1976-12-14 Compagnie Francaise D'etudes Et De Construction "Technip" Method and plants for producing, storing, modulating and distributing energy
US4183214A (en) * 1977-05-05 1980-01-15 Sunpower, Inc. Spring and resonant system for free-piston Stirling engines
US4355517A (en) * 1980-11-04 1982-10-26 Ceperley Peter H Resonant travelling wave heat engine
US4432204A (en) * 1982-06-02 1984-02-21 Mechanical Technology Incorporated Linear hydraulic drive system for a Stirling engine
US4491738A (en) * 1981-11-24 1985-01-01 Shell Internationale Research Maatschappij, B.V. Means for generating electricity during drilling of a borehole

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3563028A (en) * 1968-07-22 1971-02-16 Mc Donnell Douglas Corp Implantable radioisotope-fueled stirling engine
US3666030A (en) * 1971-02-21 1972-05-30 Dresser Ind Electrical energy supply for well tools
US3876471A (en) * 1973-09-12 1975-04-08 Sun Oil Co Delaware Borehole electrolytic power supply
US3996749A (en) * 1974-05-07 1976-12-14 Compagnie Francaise D'etudes Et De Construction "Technip" Method and plants for producing, storing, modulating and distributing energy
US4183214A (en) * 1977-05-05 1980-01-15 Sunpower, Inc. Spring and resonant system for free-piston Stirling engines
US4355517A (en) * 1980-11-04 1982-10-26 Ceperley Peter H Resonant travelling wave heat engine
US4491738A (en) * 1981-11-24 1985-01-01 Shell Internationale Research Maatschappij, B.V. Means for generating electricity during drilling of a borehole
US4432204A (en) * 1982-06-02 1984-02-21 Mechanical Technology Incorporated Linear hydraulic drive system for a Stirling engine

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0500303A2 (de) * 1991-02-20 1992-08-26 Halliburton Company Stromversorgungsvorrichtung zur Anwendung im Bohrloch
EP0500303A3 (en) * 1991-02-20 1993-02-24 Halliburton Company Electric power supply apparatus for use downhole
DE4447226A1 (de) * 1994-12-30 1996-07-04 Heinz B Mader Mehrteiliger Transportcontainer
WO2012055392A3 (de) * 2010-10-30 2013-04-04 Technische Universität Bergakademie Freiberg Meisseldirektantrieb für werkzeuge auf basis einer wärmekraftmaschine
US9328559B2 (en) 2010-10-30 2016-05-03 Marcus Schwarz Direct drill bit drive for tools on the basis of a heat engine
EP2682689A1 (de) * 2012-06-05 2014-01-08 Rohöl - Aufsuchungs AG Erzeugung elektrischer Energie aus Erdwärme

Also Published As

Publication number Publication date
DE3781293T2 (de) 1993-02-11
EP0238337B1 (de) 1992-08-26
ES2033832T3 (es) 1993-04-01
SG114092G (en) 1992-12-24
EP0238337A3 (en) 1989-03-08
CA1320481C (en) 1993-07-20
DE3781293D1 (de) 1992-10-01

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