Low pre-tightening force adjustable heat extraction packing box

Abstract

The invention relates to a heat extraction packing box in petroleum production, which is a low pre-tightening force adjustable heat extraction packing box comprising a lower packing body, a pressure cap, a pipe nipple and a sucker rod; sealing filler is filled between the lower packing body and the sucker rod; the pipe nipple is arranged below the lower packing body, a lower surface seat of the lower packing body is arranged on an upper surface of the pipe nipple; a flange is arranged below the lower packing body, a mounting hole is arranged at top of the pressure cap, the upper part of the pressure cap is sleeved on the lower packing body through the mounting hole, and the inner side of the lower part of the pressure cap is connected with the outside of the upper part of the pipe nipple;and the inner diameter of the mounting hole is larger than the outer diameter of the lower packing body. The invention has reasonable and compact structure, is convenient for using, can reduce structure size of a connection part of an adjusting mechanism of the heat extraction packing box through a perforated hollow metal O-shaped sealing ring so as to be mounted and used in a limited operation space, has characteristics of small volume, low seal pre-tightening force, reliable seal and high temperature resistance, and can adjust eccentric of the sucker rod and a well head device, thereby effectively increasing oil extraction efficiency.

Description

1. Technical field [0001] The invention relates to a thermal recovery packing box in petroleum production, which is a heat recovery packing box with low pre-tightening force and an adjustable core. 2. Background technology [0002] Thermal recovery packing box is an indispensable device in heavy oil production. Its function is to seal the polished rod of the pumping unit, and to adjust the eccentricity between the sucker rod and the wellhead device. Its working environment is in a hot steam environment of 330 degrees Celsius, so the sealing element of the centering mechanism of the thermal recovery packing box cannot use non-metallic materials, and the sealing element generally adopts a steel ring type or a copper gasket type adjustment made of metal materials. Centering mechanism, these two types of centering mechanism use bolts to compress the sealing element, the structure size of the connection is large, and the required sealing pre-tightening force is also high. With t...

AI Technical Summary

Problems solved by technology

[0003] The present invention provides a low pre-tightening force adjustable thermal recovery packing box, which can effectively solve the problem that the existing thermal recovery packing box cannot adjust the eccentricity of the sucker rod and the wellhead device on the double-pipe thermal recovery wellhead

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