Down-hole tool and controllable segment sealing device for down-hole working barrel seal

Abstract

The invention relates to a controllable section sealing device used for the sealing of a downhole tool and a downhole working barrel, comprising a barrel-shaped shell; the controllable section sealing device also comprises a sliding-sleeve driving mechanism installed in the barrel-shaped shell, seal housings fixedly sheathed on the outer wall of the barrel-shaped shell, and sliding sleeve sheathed on the outer wall of the barrel-shaped shell in a sliding way; the seal housing is provided with a bowl-mouth-shaped elastic flaring opening which is correspondingly arranged with the sliding sleeve and left with a clearance which is capable of being inserted by the sliding sleeve so as to open the lip clearance of the elastic flaring opening together with the barrel-shaped shell, the seal housings are arranged on the barrel-shaped shell in pairs, two seal housings arranged in pairs are arranged at two ends of one section of the barrel wall, and the sliding sleeves are also arranged in pairs and correspond to the pair of seal housings. The controllable section sealing device realizes the interference sealing with the working barrel and the controllable sealing and long-term monitoring of the formation pressure through the deformation of the seal sleeve, thus causing higher application value of a test file.

Description

technical field [0001] The invention belongs to the technical field of pressure sealing, and relates to a structural form of a controllable section seal matched with downhole working barrels of oil wells and water wells. Background technique [0002] At present, there are two kinds of sealing methods for the pressure measuring sealing section commonly used: O-ring sealing and mechanical trigger type cup sealing. The characteristic of the O-ring sealing method is that it is an interference seal, and the structure is relatively simple. The disadvantage is that the O-ring has poor strength and is easy to fall off. It is easy to be damaged when it enters the working cylinder, resulting in sealing failure and loss of application value of the test file. The mechanical trigger type cup sealing technology is mainly seen in the sealing section for pressure measurement of large water wells. It is characterized in that through the mechanical triggering technology, the instrument is lif...

AI Technical Summary

Problems solved by technology

The disadvantage is that the external dimension is relatively large, and it can only be tested from bottom to top. It is not suitable for oil well annulus testing, and it cannot monitor the pressure of a certain formation.

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