Heat Insulated Tubings

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.

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.

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)

Standard size of heat insulated tubings	Nominal width, mm	External pipe		Internal pipe		Coupling diameter, mm
Standard size of heat insulated tubings	Nominal width, mm	Diameter, mm	Wall thickness, mm	Diameter, mm	Wall thickness, mm	Coupling diameter, 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.