Elastic tube-type thermal production casing head

Abstract

The invention relates to an elastic pipe type thermal production casing head in the oil well casing connecting piece. The technical proposal includes that a lower flange is butt joint with an upper flange after a hanging steel cylinder is nested in the lower flange; the bottom end of the hanging steel cylinder is provided with a convex rim with contracted diameter; the convex edge is matched with the convex edge with expanded diameter on the periphery of the upper end part of a telescopic pipe; an elastic pipe is threaded through the inner cavity chamber of the hanging steel cylinder and connected between the upper end opening of the telescopic pipe and the upper end opening of the hanging steel cylinder; screw thread connected with the an outer casing is arranged on the lower end pipe wall of the lower flange. The elastic pipe type thermal production casing head well solves the telescopic problem of the telescopic pipe due to the thermal expansion because the elastic pipe additionally arranged in the hanging steel cylinder is connected with the telescopic pipe; thereby, the safety hidden trouble in the current welding fixation mode is solved completely. The elastic pipe type thermal production casing head has the advantages of novel integral structure design, convenient and stable mounting and application, reducing the production cost and ensuring the thermal production to operate safely.

Description

technical field [0001] The invention relates to an elastic tubular thermal recovery casing head in the field of oil well casing connectors, which is especially suitable for supporting use in thermal recovery production of heavy oil wells. Background technique [0002] Downhole heavy oil has a high development cost due to its high viscosity and poor fluidity. During the period of low oil prices, the development of heavy oil was not taken seriously, and its production technology and supporting equipment were generally in a backward and simple state. At present, the fixation and installation of heavy oil development wellheads are uniformly welded with circular steel plates. When the steam is injected, the expansion tube is heated and expanded, and the welded seam is pushed away. In this way, the wellhead device will be in an unknown up and down in the vertical state. The expansion tube It is also in an unconstrained state in the direction of rotation, which makes the operation ...

AI Technical Summary

Problems solved by technology

At present, the fixation and installation of heavy oil development wellheads are uniformly welded with circular steel plates. When the steam is injected, the telescopic tube is heated and expanded, and the welded seam is pushed away. In this way, the wellhead device will be in an unknown up and down in the vertical state. The telescopic tube It is also in an unconstrained state in the direction of rotation, making it difficult to control the operation and causing serious accident hazards

Especially during the installation and breakout process of the wellhead, the connection between the telescopic pipes will loosen, resulting in the leakage of the injected heat medium. In severe cases, the telescopic pipe will shoot out of the wellbore and explode into the air under the action of high temperature and high pressure medium.

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