• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    A borehole logging tool having a semiconductor detector (22) includes a cryostat (24) to maintain the detector at cryogenic temperatures. The cryostat has an elongate aluminium heat sink (46) on one end of which the detector is removably mounted. The other end of the heat sink is arranged to receive a liquid cryogen or the cold finger of a helium refrigerator, which is removed before a logging run, the detector being maintained at cryogenic temperatures during the logging run by absorption and retention of heat in the solid, single-phase heat sink. An aluminium tube (42) having similar thermal capacity and similarly pre-cooled to cryogenic temperatures, surrounds but is spaced from the heat sink, and carries it by means of low thermal conductivity supports. The tube is itself carried within an evacuated stainless steel housing (30) by similar supports, which are arranged to permit substantial differential changes in length of the tube and the housing.
    公开号:SU1281182A3
    申请号:SU802936251
    申请日:1980-06-20
    公开日:1986-12-30
    发明作者:Аллеск Роланд；Янссен Сильвиан；Турре Жан；Зарудиански Алан
    申请人:Шлюмбергер Оверсиз С.А. (Фирма)；
    IPC主号:
    专利说明:

    This invention relates to low temperature measurements and can be used in well logging.
    The purpose of the invention is to simplify the design and increase the reliability of the cryostat during logging.
    The drawing schematically shows the proposed cryostat.
    Inside the evacuated housing 1 there is a highly sensitive detector of 2 photons, which is located in a thermal contact with the heat-inertial device 3, namely with its central part - rod 4. The outer part of the heat-inertia device 3 is a pipe 5, surrounding the rod 4 and the detector 2. In the case 1 there is an opening 6 for cooling the heat-inerting device 3 before logging. Between the rod 4 and the pipe 5 there is a circular gap 7, and between the pipe 5 and the casing 1 - a gap 8; Casing 1 is made of stainless steel and is connected to pipe 5 with bellows 9, pipe
    5 is connected to the core 4 by the bellows 10. Nickel adapters are used in the joint. The core 4 and the Pipe 5 are made of an aluminum alloy of type duralumin. The lower part of the pipe 5, at the location of the detector 2, has been machined by firing. The inner surface of the casing 1, the outer and inner surfaces of the pipe 5 and the surface of the rod 4 can be polished, gilded or covered with foil,
    The cryostat operates as follows.
    Before logging through the hole
    6 introducing a refrigerant, such as liquid nitrogen or a cold pin of a helium refrigeration unit. As a result, the rod 4 and the pipe 5 are cooled
    to the boiling point of liquid nitrogen or lower. After replacing the refrigerant with a dry inert gas — nitrogen or helium to prevent moisture condensation, the opening 6 is plugged, the necessary connecting cables (not shown) are connected, the Device is inserted into the well and the necessary measurements are made. During the measurements, the detector 2 is maintained at a low temperature sufficient for its normal operation due to the heat capacity of the rod 4; Additional shielding of the rod 4 by the tube 5
    The heating of the rod 4 and detector 2 by radiation from the walls of the burn-out 1 significantly weakens. The heat capacity of the rod 4 is of the same order as the heat capacity of pipe 5. When making the rod 4 and pipe 5, it is preferable to make tube 5 of smaller mass than rod 4; Selection of materials for the heat-inertia device for reasons of maximum specific heat capacity per
    b
    unit of volume and minimum weight of the device shows that aluminum alloys (for bar and pipe 5), copper for bar 4 and aluminum alloy for pipe 5, magnetic for pipe 5 and bar 4 "are preferred, compared to known cryostats, in which a floating or evaporating refrigerant is used, the proposed cryostat is simpler in design and more reliable in exploitation. In its practical use, the thermal expansion of the elements used should be taken into account. The effect of shielding external radiation can be enhanced by using additional pipes of the heat-and-irradiation device; located around the pipe - 5 with the corresponding annular projections.
    权利要求:
    Claims (1)
    [1]
    Invention Formula
    1, A cryostat for a highly sensitive photon detector, consisting of a vacuum jacket, in which a detector and heat-inertial device are made of solid heat-conducting material, and in the case there is an opening for cooling this device before logging with an external cooling agent, characterized in that In order to simplify the design and increase reliability, the testo-inertial device contains a central part, made in the form of a rod, which is in thermal contact with the detector, and the outer part a tube surrounding the rod with the detector, wherein between the pipe and shaft and between the pipe and the casing is saved a circular gap, the material and dimensions of the rod and tube, rod okruayuschey selected such that
    31281182
    their heat capacities are quantities. and the pipe, surrounding the rod in the same order. made of the same material, pri2. The cryostat of claim 1, about t l and - the more the mass of the rod is greater than that of the pipe.
    four
    2
    类似技术:
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    Reinders et al.1987|Novel top-loading 20 mK/15 T cryomagnetic system
    Boynton1975|Canister cryogenic system for cooling germanium semiconductor detectors in borehole and marine probes
    Klipping1973|Cryogenic centres—their tasks and their organization
    Schoen et al.1962|Glass Dewars for Optical and Other Studies at Low Temperatures
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    Wheatley et al.1972|An All‐Glass Liquid Helium Dewar Employing No Auxiliary Cryogens
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    Daunt et al.1938|A simple type of helium cryostat
    Schulz et al.1985|3He cryostat for measurements in superfluid 4He below 1 K
    同族专利:
    公开号 | 公开日
    DE3069148D1|1984-10-18|
    EG14570A|1984-09-30|
    AU533206B2|1983-11-10|
    US4313317A|1982-02-02|
    GR69277B|1982-05-13|
    OA06551A|1981-07-31|
    MX148778A|1983-06-14|
    BR8003868A|1981-01-13|
    ES8102265A1|1980-12-16|
    ES492465A0|1980-12-16|
    US4315417A|1982-02-16|
    AU5900180A|1981-01-08|
    JPS5644874A|1981-04-24|
    CA1138128A|1982-12-21|
    EP0023850A1|1981-02-11|
    JPS6359543B2|1988-11-21|
    EP0023850B1|1984-09-12|
    AT9407T|1984-09-15|
    IE801239L|1980-12-21|
    NO157717B|1988-01-25|
    IN152457B|1984-01-21|
    CA1138127A|1982-12-21|
    IE49489B1|1985-10-16|
    US4312192A|1982-01-26|
    NO157717C|1988-05-04|
    NO801850L|1980-12-22|
    TR21161A|1983-11-25|
    CA1138129A|1982-12-21|
    AR229914A1|1983-12-30|
    引用文献:
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    JP5481494B2|2008-12-23|2014-04-23|クライオメディクス、エルエルシー|Tissue ablation control system and method based on isotherm|
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    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    GB7921750|1979-06-21|
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