The Hodge ?ltration and cyclic homology
The Hodge ?ltration and cyclic homology
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Hodge 过滤和循环同调
DOI：
10.1023/a:1007734302948
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发表时间：
1997
影响因子：
1.8
通讯作者：
C. Weibel
中科院分区：
文献类型：
--
作者：
C. Weibel
提供了一种地质钻探机系统，其包括钻地钻机，所述钻地钻机特别适于在温度条件下和在其中普通钻探设备不可操作的深度处被采用来执行钻探操作。该钻头包括一个穿透器头，一个可延伸的管壳装置，该管壳装置可操作地具有轴的性质，该轴在一端连接到穿透器头上，并能够延伸，以便具有足以到达被钻的孔的表面的长度，以及动力装置，该动力装置可操作地连接到穿透器头上，用于向其提供执行钻孔操作所需的动力。穿透器头部包括壳体、先导件、能量传输装置和可操作用于使钻头从孔中退出的装置。壳体由上进料壳体和下进料壳体组成，下进料壳体的一端可操作地连接到上进料壳体，另一端可操作地连接到前导件。壳体的上供给壳体又可操作地连接到可延伸管壳体的一端，即，轴，其另一端延伸到钻孔的表面。在与轴的下端连接的点处，上进料壳体的周长大于轴的周长。因此，在轴的下端和壳体的上端之间的连接点处建立了过锁，该过锁可操作以阻止被截留在地表以下的大量液体和气体向上通过钻孔，而如果允许这些液体和气体向上流动，则这些液体和气体又会对在钻机上工作的人员造成潜在的危险。优选地，所述轴沿其长度以沿着隔开的间隔设置有多组向外延伸的构件，所述构件的构造在本质上类似于滑雪板的构造。每组滑板最好由三个滑板组成，这些滑板从轴的外表面径向向外伸出，并可在缩回位置和伸出位置之间移动，在伸出位置，每个滑板的自由端与钻孔的侧壁以基本上等间距的关系围绕钻孔的圆周接合，从而轴的重量至少部分地由滑板与侧壁的相互接合来支撑。那个洞能量传输装置沿轴向下延伸并基本上穿过壳体的中心，并且包括一端连接到前件而另一端连接到动力装置的电极。电极的至少一部分被绝缘体包围从而与壳体绝缘，该电极可操作以将前驱体加热到前驱体变得熔融的温度。穿透器头部的壳体设置有渣逸出装置，该渣逸出装置可操作以允许在钻孔操作期间形成的渣逸出。用于使钻头退出的装置包括形成在上进给壳体中的纵向延伸的开口，通过该开口能够施加压力以使钻头通过被推回到孔的顶部而退出。
A geopenetrator system is provided comprising an earth boring drill which is particularly adapted to be employed to perform a drilling operation under temperature conditions and at depths wherein ordinary drilling devices are inoperable. The drill includes a penetrator head, an extendible pipe casing means operable in the nature of a shaft which is connected at one end to the penetrator head and is capable of being extended so as to have a length sufficient to reach the surface of the hole being drilled, and power means operatively connected to the penetrator head for supplying the power thereto required thereby to perform the drilling operation. The penetrator head includes a housing, a forerunner, energy transmitting means, and means operable for purposes of causing withdrawal of the drill from a hole. The housing is composed of an upper feed casing and a lower feed casing which is operatively connected at one end to the upper feed casing and at the other end to the forerunner. The upper feed casing of the housing is in turn operatively connected to one end of the extendible pipe casing, i.e., shaft, the other end of which extends to the surface of the drilled hole. The circumference of the upper feed casing at the point of connection with the lower end of the shaft is greater than that of the shaft. As a result, there is an over lock established at the point of connection between the lower end of the shaft and the upper end of the housing which is operable to inhibit the passage of volumes of liquids and gases trapped below the surface of the earth up the drilled hole which in turn if permitted to flow up the drilled hole could pose a potential hazard to personnel working on the drilling rig. Preferably, the shaft at spaced intervals along the length thereof is provided with a multiplicity of sets of outwardly extending members embodying a configuration which is similar in nature to that of skis. Each set preferably consists of three skis projecting radially outwardly from the outer surface of the shaft and being movable between a retracted position and an extended position wherein the free end of each ski engages the sidewall of the drilled hole in substantially equally spaced relation around the circumference thereof whereby the weight of the shaft is at least partially supported by means of the interengagement of the skis with the sidewalls of the hole. The energy transmitting means extends down the shaft and through substantially the center of the housing, and includes an electrode connected at one end to the forerunner and at the other end to the power means. The electrode, at least a portion thereof which is surrounded by insulation thereby to be insulated from the housing, is operable to heat the forerunner to a temperature wherein the latter becomes molten. The housing of the penetrator head is provided with slag escape means operable to permit the escape of the slag formed during the drilling operation. The means for causing withdrawal of the drill includes a longitudinally extending opening formed in the upper feed casing through which pressure is capable of being applied to cause the drill to be withdrawn by being pushed back to the top of the hole.