公开(公告)号：US20030090270A1

公开(公告)日：2003-05-15

申请号：US09838576

申请日：2001-04-18

发明人： Mats Lagmanson

IPC分类号： G01V003/06

CPC分类号： G01V3/04 ,  G01V3/22

摘要： Methods and apparatuses for measuring an electrical property of the ground. The apparatus includes a graphite electrode. The graphite electrode includes a graphite body and a first and second opening. The first opening extends longitudinally throughout the graphite body and is configured to receive a multi-wire cable. The second opening is configured to secure one or more wires of the multi-wire cable to the graphite body. Using a graphite electrode, measurements of the ground can be made over a long period of time without having to clean or otherwise maintain the electrodes because the graphite material withstands operating conditions over many years without degradation.

摘要翻译： 用于测量地面电气特性的方法和装置。 该装置包括石墨电极。 石墨电极包括石墨体和第一和第二开口。 第一开口在整个石墨体上纵向延伸并且构造成接收多线电缆。 第二开口构造成将多线缆线的一根或多根线固定到石墨体上。 使用石墨电极，可以长时间测量地面，而不必清洁或以其他方式保持电极，因为石墨材料经受多年的操作条件而不会降解。

公开(公告)号：US20040104726A1

公开(公告)日：2004-06-03

申请号：US10462884

申请日：2003-06-16

申请人： Baker Hughes Incorporated

发明人： Roland E. Chemali ,  Paul Pastusek ,  Friedhelm Makohl ,  Rene N. Ritter ,  Martin Townley Evans ,  Stanley T. Hewitt

IPC分类号： G01V003/06 ,  G01V003/18

CPC分类号： E21B47/024 ,  E21B47/01 ,  G01V3/24 ,  G01V3/28 ,  Y02A90/342

摘要： A method and apparatus for obtaining a resistivity measurement of an earth formation surrounding a borehole in an MWD device uses an electrode for injecting current into the earth formation and an electrode for obtaining a responsive signal from the borehole. The electrodes are located on the drill bit arm or blade. Measured resistivity values are obtained at the location of the drill bit. Measurements can be taken in both oil-based mud and water-based mud environments. Maximum or minimum resistivity can be used to best represent the resistivity of the surrounding formation.

摘要翻译： 用于获得MWD装置中的钻孔周围的地层的电阻率测量的方法和装置使用用于向地层注入电流的电极和用于从钻孔获得响应信号的电极。 电极位于钻头臂或刀片上。 在钻头的位置处获得测量的电阻率值。 可以在油基泥浆和水基泥浆环境中进行测量。 最大或最小电阻率可用于最好地表示周围地层的电阻率。

公开(公告)号：US20020105334A1

公开(公告)日：2002-08-08

申请号：US10056809

申请日：2002-01-24

申请人： Compagnie Du Sol

发明人： Giovanni Aiello

IPC分类号： G01V003/06

CPC分类号： E21B47/122 ,  E21B17/003

摘要： The present invention relates to a drill string fitted with information transmission means. The hollow rods of conductive material have their inside faces covered in an insulating material. The transmission means comprise a first electrical unit having at least a first annular electrode secured to the insulating inside face of the drill string, said electrode being in electrical contact with the mud contained inside the drill string so as to establish a flow of current in the conductive mud; and a second electrical unit disposed in said borehole, close to the top end of the drill string in order at least to receive the information contained in said electrical current.

摘要翻译： 本发明涉及一种装有信息传输装置的钻柱。 导电材料的中空棒的内表面被覆盖在绝缘材料中。 传动装置包括第一电气单元，其具有固定到钻柱的绝缘内表面的至少第一环形电极，所述电极与钻柱内部的泥浆电接触，以便在 导电泥; 以及设置在所述钻孔中的靠近钻柱的顶端的第二电单元，以至少接收包含在所述电流中的信息。