Change in length of drill string containing an instrument

Details Change in length of drill string containing an instrument Change in length of drill string containing an instrument

1977-10-03

1979-03-13

Purser, Ernest R.

Boring or penetrating the earth

With signaling, indicating, testing or measuring

Tool position direction or inclination measuring or...

175 61, 175 62, 175 85, 175320, E21B 4702

Patent

active

041437217

ABSTRACT:
Methods and apparatus are provided for enabling an instrument and a connected flexible line contained in a drill string to be left in the string while a pipe section is being added to or removed from the string, to thereby avoid the inconvenience and loss of time normally involved in removing the instrument and flexible line from the string on each such occasion. This result is preferably accomplished by initially threading the flexible line at the surface of the earth through a series of extra pipe sections positioned at a storage location adjacent the well, so that each of these sections can then be successively moved from that location to a position of connection into the upper end of the drill string with the flexible line already installed in the added section.

REFERENCES:
patent: 2370818 (1945-03-01), Silverman
patent: 3285629 (1966-11-01), Cullen et al.
patent: 3825078 (1974-07-01), Heilhecker et al.

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