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A method and apparatus for conducting logging or perforating operation in a borehole, particularly a deviated borehole, includes lowering a length of drill pipe having the well-logging tool, or well bore perforator, releasably mounted thereon into the borehole. An extension member, which is also low

A method and apparatus for conducting logging or perforating operation in a borehole, particularly a deviated borehole, includes lowering a length of drill pipe having the well-logging tool, or well bore perforator, releasably mounted thereon into the borehole. An extension member, which is also lowered through the drill pipe, is secured to the well-logging tool, or well bore perforator, and releases it from the drill pipe, whereupon the extension member and well-logging tool or well bore perforator are moved through the borehole. The apparatus includes a latching sub mounted to the end of the length of drill pipe, and a latching head releasably mounted within the latching sub for releasably holding a well-logging tool or well bore perforator within the latching sub.

대표청구항 ▼

A method for logging earth formations surrounding a borehole, utilizing a well-logging tool releasably mounted to the end of a length of drill pipe, comprising: lowering the length of drill pipe, having the well-logging tool releasably mounted thereon, into the borehole; lowering an extension member

A method for logging earth formations surrounding a borehole, utilizing a well-logging tool releasably mounted to the end of a length of drill pipe, comprising: lowering the length of drill pipe, having the well-logging tool releasably mounted thereon, into the borehole; lowering an extension member through said drill pipe into engagement with said well-logging tool; securing said extension member to said well-logging tool; releasing said well-logging tool, with said extension member secured thereto, from said drill pipe; and moving said well-logging tool, with said extension member secured thereto, through the borehole and beyond the drill pipe to log at least a portion of the earth formations surrounding said borehole. Apparatus for use in logging earth formations surrounding a borehole, comprising: a latching sub having upper and lower ends and a central bore, including means for mounting said latching sub to the end of a length of drill pipe, said means for mounting disposed at the upper end of said latching sub; and a latching head, having upper and lower ends, releasably mounted within the bore of said latching sub, said latching head having: means for attaching a well-logging tool to the lower end of said latching head; a first electrical connection means disposed at the upper end of said latching head; releasable latching means for engagement with said latching sub to releasably secure said latching head to said latching sub; and means for selectively actuating said releasable latching means, said actuating means including a second electrical connection means, whereby the well-logging tool may be selectively released from the latching sub to enter the borehole.