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11.4.2 Disassemble and assemble under the teacher’s supervision
downhole pressure gage DPGNS-2 (МГН-2). Study its structure.
Draw the principle chart of the downhole pressure gage DPGNS-2
(МГН-2) (fig. 11.1). Study the structures of other downhole pressure

gages by means of the educational posters.
11.4.3 Note the technical characteristics of the downhole pressure

gages.
11.4.4 Study the diagram recorded during measuring the
bottomhole and formation pressure (the diagram of pressure change).
Study the general principle of decoding the diagram. Study what
devices are used for decoding the diagram of pressure change. Draw

the diagram recorded measuring the bottom hole and formation
pressure (the diagram of pressure change) (fig. 11.2). Study what does
each line and point on the diagram of pressure change mean.

11.4.5 Study the devices which are used for lowering the
downhole device (downhole pressure gage) down into the well. Study
the chart of equipment of the wellhead of the flowing, gas-lift,

injection and observation oil well during downhole measurements
(fig. 11.3).

11.5 Checking questions

11.5.1 What purpose are downhole pressure gages used for?

11.5.2 What types of the downhole pressure gages (by the
principle of operation) do you know?
11.5.3 Advantages and disadvantages of the helix downhole
pressure gages.

11.5.4 The structure and the principle of operation of the helix

downhole pressure gage DPGNS-2 (МГН-2).
11.5.5 What devices are used to decode the diagram recorded

during the measurements of bottom hole and formation pressure?
11.5.6 Explain what do lines CD, EF and FG on fig. 11.2
correspond to?
11.5.7 What devices are used to lower the downhole pressure gage

or other downhole device into the well?

11.6 References
/4,7,13,21/

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