Thermal recovery packing box with replaceable polish rod

Abstract

The invention relates to the technical field of oil field equipment, in particular to a thermal recovery packing box with a replaceable polish rod. The packing box comprises a polish rod embracing seal body, the polish rod embracing seal body comprises an embracing seal shell, a seal assembly and an embracing assembly, two or more seal assemblies are distributed in the circumference of the embracing seal shell and can move inwards and outwards, when all the seal assemblies move to the inner end, the seal assemblies and the outer side of the polish rod can form seal, and two or more embracing assemblies are distributed in the circumference of the embracing seal shell and can move inwards and outwards. The arranged embracing assembly can clamp an outer annular groove in the polish rod, meanwhile, the upper end face of the outer annular groove of the polish rod can realize a securing effect when the polish rod is clamped, the arranged seal assemblies can seal the outer side of the polishrod to effectively prevent blowout accidents, kill fluid does not need to be injected, steam injection repetition is not needed, the temperature of a wellhead can be kept, the well-killing operation period can be shortened, cost can be lowered, and production efficiency can be improved.

Description

technical field [0001] The invention relates to the technical field of oilfield equipment, and relates to a replaceable polished rod thermal recovery packing box. Background technique [0002] Heavy oil wells are exploited by steam injection huff and puff, thermal recovery packing box is an indispensable device in heavy oil exploitation, one of its functions is to seal the polished rod. Since the working environment of the thermal recovery packing box is a hot steam environment with high pressure and high temperature (the temperature is about 300 degrees Celsius), the polished rod is easy to wear during the oil pumping process, and the sealing element of the thermal recovery packing box is prone to premature failure and the crude oil The wellhead is polluted, and the polished rod has the risk of breaking off, resulting in a blowout accident, requiring workover operations, replacing the polished rod and the sealing element of the thermal recovery packing box. [0003] In the...

AI Technical Summary

Problems solved by technology

[0004] The invention provides a replaceable polished rod hot mining packing box, which overcomes the above-mentioned deficiencies in the prior art, and can effectively solve the problems of long working cycle, long downtime and low productivity of the existing hot-pressed operation for replacing polished rods.

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