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1М) and DPGFT-3 (МГИ-3). In particular, to switch on the
clockwork drive a hydroswitch is used in these downhole pressure
gages. The hydroswitch consists of bellows, sealed piston and
spring-loaded rod with graduated marks.

The technical characteristics of downhole pressure gages

DPGNS-2 (МГН-2), DPGFT-1M (МГИ-1М), DPGFT-3 (МГИ-3)
and DPGT-1 (МГТ-1) are given in table 11.2.

Table 11.2 – The technical characteristics of downhole pressure gages

DPGNS-2 (МГН-2), DPGFT-1M (МГИ-1М), DPGFT-3 (МГИ-3) and

DPGT-1 (МГТ-1)

The type of downhole pressure gage
Index DPGNS-2 DPGFT-1M DPGFT-3 DPGT-1
(МГН-2) (МГИ-1М) (МГИ-3) (МГТ-1)
16; 25;
The upper limit of pressure 10; 16;
40; 60; 80 40; 60; 25
measuring, MPa 25;100
80; 100

о 100 –
The working temperature, С 100 160 400
160
The accuracy class , % 0.6; 1.0 0.6 – 1.0 0.25 2.0

The recording length on
50 50 90 50
pressure, mm
The recording length on time,
120 120 190 –
mm
Sizes, mm: 1500 – 2000 – 1900 1700
the length 1800 2300
the diameter 32 – 36 36 56 32
The mass, kg 10 12 16.5 8.0

The series (row) of the unified downhole pressure gages DPGU
(МСУ) has been developed on the base of downhole pressure gages

DPGNS-2 (МГН-2) and DPGFT-1M (МГИ-1М). They are

characterized by the range of pressure measuring from 10 to 200 MPа
о
at the temperature up to 250 – 400 С. They have insignificant
structural differences in comparison with downhole pressure gages
DPGNS-2 (МГН-2) and DPGFT-1M (МГИ-1М).

Downhole pressure gages DPGU-1 (МСУ-1), DPGU-HA1
(МСУ−Т1) and DPGU-C-1 (МСУ-К-1) are applied for putting into
producing wells. Downhole pressure gages DPGU-2 (МСУ-2),
DPGU-HA2 (МСУ−Т2) and DPGU-C-2 (МСУ-К-2) with

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