Casing head for thermal recovery of thick oil

Abstract

The invention relates to a casing head, in particular to a casing head for thermal recovery of thick oil. The casing head comprises a hollow casing, a telescoping pipe, and a hollow hanger, wherein bevels which can be matched each other are arranged on the inner wall of the casing and the outer wall of the hanger; the hanger is hung in the casing through the matching of the bevels, and a flange is fixedly connected to the top end surface of the casing and compacts the hanger downwards; an inwards-constrcted raised edge is arranged at an the opening in the lower end of the hanger, and an outwards-extended raised side is arranged at an the opening in the upper end of the telescoping pipe; the raised side can be matched in the hanger in a manner of moving up and down, and sealing rings are arranged between the raised edge and the hanger; a spring is positioned in the hanger, and the upper end and the lower end of the spring respectively support the lower end surface of the flange and the upper end surface of the telescoping pipe, so that the raised side and the raised edge are in tight contact. According to the casing head disclosed by the invention, the spring is additionally mounted between the flange and the telescoping pipe, and the spring is used for absorbing energy generated when the telescoping pipe is heated to be and expanded, so that during conventional welding, the influence of the heated telescoping pipe on weld joints is avoided, and potential safety hazards are eliminated.

Description

technical field [0001] The invention relates to a casing head, in particular to a casing head for thermal recovery of heavy oil. Background technique [0002] At present, the fixing and installation of heavy oil development wellheads are basically welded. When steam is injected, the telescopic tube will expand when heated, and there is a safety hazard in opening the weld at the wellhead. Especially in the installation and breakout process of the wellhead, it is easy to cause leakage of the heat medium injected inside, which threatens the life safety of the staff. Contents of the invention [0003] In order to solve the deficiencies of the prior art, the invention provides a sleeve head capable of avoiding damage to the inlet weld seam caused by thermal expansion of the telescopic tube. [0004] The technical scheme that the present invention solves the problem adopts is: [0005] A casing head for thermal recovery of heavy oil, comprising a hollow shell, a telescopic tub...

AI Technical Summary

Problems solved by technology

[0002] At present, the fixing and installation of heavy oil development wellheads are basically welded. When the steam is injected, the telescopic tube will expand when heated, and there is a safety hazard in the weld seam at the top opening of the wellhead.

Especially during the installation and breakout process of the wellhead, it is easy to cause leakage of the heat medium injected inside, posing a threat to the life safety of the staff

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