Thermal sleeve means having insulating properties of casing products, heavy oil thermal recovery processes is an important production facility for heat carrier temperature does not exceed 350 ℃ working conditions, mainly for oil "steam flooding", steam "throughput" heavy oil thermal recovery operations. It consists of an inner tube, an outer tube, a heat insulating material, heat insulation bushing, coupling, etc., depending on its thermal conductivity reached 0.00 7w / m ℃. By high temperature testing, and under the same conditions common casing, 1000m depth of the bottom stem reaches 40-50%. Therefore, applications can greatly improve the thermal sleeve bottom dryness wellbore reduced heat loss and improve the thermal efficiency of the steam. At the same time meet the needs of different depth and horizontal heavy oil wells, deep heavy and special (super) heavy oil thermal recovery and other operations.
Outer tube OD* Inner tube ID
Outer Tube Thickness
Inner Tube Thickness
5 1/2*4 1/2
5 1/2 BC
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OCTG inspection items are as follows: appearance inspection, dimension inspection, chemical composition inspection, performance test, drift test, straightness inspection, pipe magnetic leakage and ultrasonic flaw detection, standoff inspection, thread inspection, phosphating corrosion inspection and hydraulic water pressure test.