| 摘要 |
An insulating component for inclusion in a down hole drill string comprising: a first part or connected group of parts, the first part or group of parts including a first connection site at or near a first end of the component for connection to a first additional component in a drill string; a second part or connected group of parts, the second part or group of parts including a second connection site at or near a second end of the component for connection to a second additional component in a drill string; a first right-hand threaded connection located between the first connection site and the second connection site; and a second, left-hand threaded connection located between the first connection site and the second connection site, wherein the first part or group of parts is electrically insulated from the second part or group of parts through insulating material provided between the first part or group of parts and the second part or group of parts, so that the first and second connection sites are electrically insulated from one another. |
