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Heat Insulated Tubings
The main application of Heat Insulated Tubings is:
to prevent continuous permafrost from defrosting near wellbore zones and to prevent bridgeover during well operations,
to prevent walls of heat insulated tubings from wax precipitation during oil production,
to keep formation fluid temperature,
to prevent gas hydration during gas production,
to inject steam during viscous oil recovery,
to provide ecological balance during oil and gas production in the offshore wells,
to prevent casing collapse due to depressurizing in the isolated interstices of the annulus in the offshore wells.
Design features of Heat Insulated Tubings
Possibility to control and restore vacuum in a tubular annulus,
To compensate heat expansion of the inner tube it is possible to install expansion joints in order to inject the steam which allows to unload welded seams from severe load and thus increasing the operation life of a heat insulated tubing by several times.
Technical specifications of Heat Insulated Tubings
Parameter
Description
Heat insulation thermal conductivity coefficient at the internal environment temperature
110°С
Not more than 0,004 W/m·K
210°С
Not more than 0,010 W/m·K
356°С
Not more than 0,012 W/m·K
Maximum temperature of an external pipe at the internal environment temperature
110°С
Not more than 25°С
210°С
Not more than 30°С
356°С
Not more than 70°С
Thermal conductivity coefficient of the coupling insert material
Not more than 0,25 W/m·K
Thread type
Gas-proof
Operating temperature
Up to 356 °С
Annulus casing pressure (vacuum)
Not more than 6х10
-4
mm Mercury (8х10
-2
Pa)
Pipe grades of Heat Insulated Tubings
Standard size of heat insulated tubings
Nominal width, mm
External pipe
Internal pipe
Coupling diameter, mm
Diameter, mm
Wall thickness, mm
Diameter, mm
Wall thickness, mm
Heat insulated tubings 219х168
150
219,08
8,94-10,16
168,28
8,94
244,48
Heat insulated tubings 178х140
124
177,80
8,05-9,19
139,70
7,72-9,17
194,50
Heat insulated tubings 168х127
114
168,28
8,94
127,00
6,43-7,52
187,71
Heat insulated tubings 168х114
100
168,28
8,94
114,30
6,88-7,37
187,71
Heat insulated tubings 168х102
89
168,28
8,94
101,60
6,50-8,38
187,71
Heat insulated tubings 146х114
100
146,00
9,5
114,30
6,88-7,37
166,00
Heat insulated tubings 146х102
89
146,00
9,5
101,60
6,50-8,38
166,00
Heat insulated tubings 140х114
100
139,70
7,72-9,17
114,30
6,88-7,37
153,67
Heat insulated tubings 140х102
89
139,70
7,72-9,17
101,60
5,74-6,65
153,67
Heat insulated tubings 140х89
76
139,70
9,17
88,90
6,45-8,00
153,67
Heat insulated tubings 127х89
76
127,00
7,52-9,19
88,90
6,45-8,00
141,30
Heat insulated tubings 114х89
76
114,30
6,88-7,37
88,90
6,45-8,00
132,10
Heat insulated tubings 114х73
62
114,30
6,88-7,37
73,02
5,51
132,10
Heat insulated tubings 102х73
62
101,60
5,74
73,02
5,51
120,60
Heat insulated tubings 89х60
50
88,90
6,45
60,32
4,83
108,00
Heat insulated tubings are manufactured with length of 9,5 to 12 m. By agreement with the customer, it is possible to manufacture heat insulated tubings with length of 6 to 9,5 m.
By agreement with the customer, it is possible to manufacture heat insulated tubings of other grades.
Heat insulated tubings are manufactured from pipe grades according to GOST 632, GOST 633, GOST R 53366, API 5CT.
Heat insulated tubings are manufactured with gas-proof threaded joints TMK UP FMT, TMK UP GF, TMK UP PF, VrTZ-1, WT and others.
Heat insulated tubings are manufactured in cold resistant and standard version.
Heat insulated tubings may be manufactured from martensitic steels, resistant to carbon dioxide corrosion.
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