Bladder pump for borehole sampling

E - Fixed Constructions – 21 – B

Patent

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Details

E21B 49/08 (2006.01) E21B 43/12 (2006.01) F04B 43/00 (2006.01) F04B 43/10 (2006.01) F04B 47/04 (2006.01)

Patent

CA 2456600

The bladder, of flimsy ptfe tubing, is attached to the stem of an end-fitting. The stem is formed with a helical screw-thread form. The tubing is heat-shrunk down over the stem. Then, a helical coil spring is screwed onto the form, whereby the thickness of the ptfe tubing lies trapped and squeezed between the stem and the spring. This manner of attaching the bladder to the stem is mechanically adequate even when the bladder tubing is of small diameter.

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