Isolating packer units in geological and geophysical measuring casings

An isolating packer unit in a geological and geophysical measuring casing made up of a plurality of said units at different levels and through which can be moved instruments for taking measurements and samples in wells or bore holes at said different levels, each isolating packer unit comprising:

• axially aligned and spaced measuring casings,
• a coupler tube connected at opposite ends to ends of the casings to interconnect the casings, said casings and tube forming a common passageway through which an instrument can be moved to take measurements and samples,
• a measuring port in the coupler tube permitting communication between the interior and exterior thereof,
• a valve normally closing the measuring port and operable from within the tube by said instrument to open said port,
• an elongate elastic packer tube mounted on and concentric with each casing, said each casing extending through its packer tube and beyond the ends thereof,
• securing means fastening the ends of each packer tube to the casing extending through the latter packing tube, and
• means for directing fluid from the top of the wall or bore hole in which the packer unit is located into both of said packer tubes to expand the packer tubes to engage the wall of said well or bore hole to isolate the measuring port of the coupler tube from the portions of the well or bore hole above and below the packer units.