Page 75 - 5010

downhole lubricator (lubricator) on the wire of diameter 1.8 – 2 mm

by means of drawworks. Reaching the necessary depth the flowing

sampler is kept at this depth with open valves for 15 − 20 minutes to
provide the accordance of oil in it to the formation conditions (for

thermostatting the oil sample and displacing the oil sample which

entered the downhole sampler before) and after this the sampler is
lifted up to the surface. While raising the sampler up, the pressure
difference growing on the valves helps to increase the reliability of

hermetization of the oil sample taken out of the well.

10.3 Equipment, devices and materials

The flowing downhole sampler BS-3M (ПД-3М); a clockwork
drive; educational posters.

10.4 Procedure

10.4.1 Study the classification of downhole samplers by the way
of the inlet chamber filling up and by the way of control of valves

operation and study the field of application of the samplers of different
types.
10.4.2 Under the supervision of the teacher disassemble and

assemble downhole sampler BS-3M (ПД-3М). Study its structure.
Draw the principle chart of downhole sampler BS-3M (ПД-3М) (fig.
10.1). Study the structures of other downhole samplers by means of
the posters.

10.4.3 Study the procedure and peculiarities of the oil bottom hole
sampling.

10.5 Checking questions

10.5.1 What types of downhole samplers do you know?

10.5.2 What are advantages and disadvantages of downhole
sampler BS-3M (ПД-3М)?
10.5.3 What is the structure and the principle of operation of

the sampler BS-3M (ПД-3М)? Indicate the field of application of the
samplers of different types.
10.5.4What is the representative oil sample?

74