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Wires and cables for field geophysical operations

Description

The wires are designed for installation and interconnection of measuring tools and power feeding units in different geophysical lines used in field conditions including in seismic streamers. The wires are divided in this group as power-signal and temperature and pressure resistant.

Power-signal wires is possible to classify by number and sections of conductors and tensile strength. By number of conductors, the wires can be single and double cored. Power-signal wires have the following range: 0,35; 0,5; 1,0; 2,5; 4,0 6,0 2. On tensile strength, the wires can be divided as with normal strength (copper cores) and reinforced (steel copper cores).


Specifications

Power-signal wires are made from copper and steel-copper current conductors and insulated by light stabilized low-pressure polyethylene. Design of wires and technical parameters are indicated in the table No1.

Letter notation of power-signal wire is performed the following way:

/G- geophysical/ P - wire (second letter), polyethylene insulation (last or penultimate letter) /M copper wires of conductor /S steel wires of conductor /O light weight

Example of notation: 1,0 geophysical wire with steel copper conductor(s) with section 1,0 mm2 and insulation of polyethylene, lightweight.

Thermal and pressure resistant wires are designed to manufacture a geophysical probe cable operating at alternating voltage up to 500 V and temperature up to +200.

Thermal and pressure resistant wires are made from steel-copper or copper-steel current conductors with section 1,5 mm2, insulated by copolymer propylene (+150) or by fluoroplast (+200) when steel and copper wires are in different winds.

Example of notation:

TBP 1,5-150-SM thermal and pressure resistant wire with steel copper current conductor (inside wind of steel wire, outside copper wire) with section 1,5 mm2 in insulation from copolymer propylene.

TBP 1,5-200-MS thermal and pressure resistant wire with copper-steel current conductor (inside wind of copper wire, outside steel wire) with section 1,5 mm2 and insulation of fluoroplast.

Fig.1 Appearance of geophysical wires

Table 1 Technical parameters of geophysical wires

Cable type

Resistance of conductor,

not over hm/km

Resistance of insulation,

not less hm*km.

Calculated weight,

kg/km

Signal -power wires TU 16.79-006-88

GSP 10,35

98,6

500

5,3

GSP 20,35

98,6

500

10,7

GSP 10,5

68,5

500

7,8

GSP 20,5

68,5

500

15,8

GPSMP 12,5

12,46

500

34,7

GPSMP 14,0

7,7

500

49,6

GPMP 16,0

3,11

500

76,0

GPSMPO 11,0

40,0

500

17,2

GPSMPO 21,0

40,0

500

35,3

GPMP12,5

8,05

500

35,7

GPMP 14,0

4,89

500

51,1

Wires thermal and pressure resistant TU 14172-500-41578716-01 complies TU 16-705.065-78

TBP 1,5-150SM

18,4

250

18,5

TBP 1,5-150MS

36,8

250

16,3

TBP 1,5-200SM

18,4

250

24,0

TBP 1,5-200MS

36,8

250

22,3

Cables for field geophysical operations

Cables for field geophysical operations

Cables for field geophysical operations

Inner wind-steel wires, outside wind of copper wires

Inner wind copper wires, outside steel wires

Mixed steel-copper wind

Fig.2 Examples of geophysical wires.

Seismic cables

This type of geophysical cables is designed for seismic exploration in field conditions in communication lines of seismic stations with linear channel division, and telemetry stations at minimal operating temperature up to -50oC.

Seismic cables classified by the following main features:

- Number of cores (pairs) can be up to two hundred;

- Flexibility divided in two groups: with normal flexibility (single wire current conductor) and increased flexibility (multi-wire current conductors);

- Tensile strength - alsodivided in two groups: normal strength and increased strength (cables with load carrying element).

Design of seismic cables:

Load carrying element(in cables with increased tensile strength) made of high-strength threads (SVM-thread, Armos, Kevlar) that increased cable tensile strength not affecting flexibility of the cable. Depending design of the cables, load-carrying element can be covered by sheath of thermal plastic polyurethane.

Current conductor produced in three versions:

1. Steel copper wire formed by winding of four steel galvanized wires with diameter 0,25 mm and three tined copper wires with diameter 0,25 mm. Steel-copper conductor is used for cables KS-2S KS-3S.

2. Single wire conductor formed as self-tinned enameled wire PEVTL-1-155 with diameter 0,335 mm.

3. Multi-wire conductor formed as strand of seven soft copper wires with diameter 0,12 mm.

Insulationof copolymer propylene on current conductors.

Filler sealing material preventing water ingress to cable. The filler is used by request of a customer.

Dividing yarn cottonyarn of different colors serves to divide of winds. Dividing yarn is laid to the cable with number of winds not over two.

Winding polyethylene terephthalate for fixing core of the cable.

Sheath of seismic cables produced of thermoplastic polyurethane with increase stability to abrasion, frost resistance, flexibility and resistance to mould.

Cable KS-3S for connection of geophone to communication

Cable KSTGA-16 for field geophysical operations

Cable KSL for seismic communication lines

CableS-3S for connection of geophone to communication line of seismic stations.

1 steel wire;

2 copper wire;

3 - sheath.

Cable KSTGA -16 for communication lines with digital seismic stations of type Input/Output.

1 load carrying element (yarn Armos);

2 twisted pairs;

3 - sheath.

Cable KSL 100-EM-SU for use in seismic communication lines with linear division of channels.

2 twisted pairs;

3 - sheath.

Fig. 3 Example designs of seismic cables

Table 2 Technical characteristics of seismic cables

Type

Diameter of cable not over, mm

Breaking load not less, kN

Weight not over, kg/km

Resistance of core not over, hm/km

STGA-16

9,0

1,2

80

225,3

KSL560,08-3,5

17,0

3,5

215

247,5

SL560,08-3,5

17,0

3,5

224

225,3

KSL2000,08-45

19,0

45

400

247,5

KSL24-E-SU

9,1

-

86

225,3

KSL24-7-SU

9,1

-

84

247,5

KSL40-7-SU

12,5

-

156

165,3

KSL50-EM-SU

12,5

-

155

225,3

KSL50-7-SU

12,5

-

146

247,5

KSL100-EM-SU

15,5

-

240

225,3

KSL100-7-SU

15,5

-

225

247,5

KSL200-7-SU

15,5

-

270

247,5

Seismic cable

Fig. 4 Appearance of seismic cables




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