Thermal recovery compensation sealed pipe column

Abstract

The invention discloses a thermal recovery compensation sealed pipe column. The thermal recovery compensation sealed pipe column comprises an inner pipe and an outer pipe; the inner pipe is sleeved with the outer pipe; the lower end of the inner pipe extends out of the outer side of the outer pipe; a sealed corrugated pipe is arranged between the inner pipe and the outer pipe; a sealing system is arranged on the outer pipe, and comprises a seal sleeve; a sealing cavity is formed inside the seal sleeve; independent sealing grooves are respectively formed in the upper end and the lower end of the sealing cavity; seal rings are mounted in the sealing grooves, and adopt fluoroether rubber seal rings; an injecting hole leading to the sealing cavity is formed in the seal sleeve. The thermal recovery compensation sealed pipe column has the advantages that the outer contact surface of the inner pipe is subjected to chromate finish, so that the abrasive resistance, the anti-corrosion property, the leakproofness and the like are improved, high temperature steam is prevented from corroding the contact surface, and the sealing problem due to friction which is caused by the fact that the inner pipe and the outer pipe displace, is prevented; the stainless steel sealed corrugated pipe is designed between the inner pipe and the outer pipe, and connects the inner pipe with the outer pipe through welding, the outer pipe is provided with an inner seal sleeve, and the sealed corrugated pipe is made of austenitic stainless steel. Therefore, the temperature resistance and the corrosion resistance of the sealed corrugated pipe are ensured.

Description

technical field [0001] The invention relates to a compensation pipe string, in particular to a thermal recovery compensation seal pipe string used for steam injection in the heavy oil production process. Background technique [0002] At present, heavy oil wells are generally developed by thermal oil recovery. When injecting steam, heat-insulating strings should be used to reduce heat diffusion and protect the casing and the cement sheath outside the casing. The thermal compensation string is an important part of the steam injection string. The function is to compensate the change in string length caused by the temperature change of the well pipe. Most of the currently used compensation strings for thermal recovery use ordinary double-layer concentric sealed expansion tubes or elastic compensation double-layer concentric sealed expansion tubes. At present, in the process of steam flooding, the requirements for the performance of the telescopic tube are also relatively high. ...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a compensation sealing pipe string for thermal recovery, which solves the problems of easy fouling and poor sealing on the outer w

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