Multichannel end portion full-circumferential-direction elastic support and isolation sealing device

Abstract

The invention relates to a packer used in oilfield development, in particular to a multichannel end portion full-circumferential-direction elastic support and isolation sealing device which is mainly aimed for oil-water wells needing a testing process. The two ends of a center pipe of the device are connected with an upper connector and a lower connector separately; the center pipe is sleeved with an expansion type rubber tube; the two ends of the expansion type rubber tube are sleeved with protective sleeves and are in threaded connection with the protective sleeves separately; the protective sleeves are further connected with the upper connector and the lower connector in a sleeving mode; a setting hole communicates with the annulus between the center pipe and the expansion type rubber tube; protection springs are connected with one end or two ends of the expansion type rubber tube in a sleeving mode; and the protection springs are located at the position, below the protective sleeve on the upper portion or above the protective sleeve on the lower portion, of the expansion type rubber tube. As the ends of the rubber tube are sleeved and connected with the protection springs, when the packer conducts setting, the springs expand together with the rubber tube, a spring steel wire plugs the annulus between a packer steel body and a casing pipe, the end portions of the rubber tube of the packer does not creep towards the annulus or lose efficacy when the rubber tube of the packer bears a large pressure difference, and thus the sealing performance of the device is improved.

Description

technical field [0001] The invention relates to a packer used in oil field development, in particular to a full-circumferential elastic support isolation and sealing device at the ends of multi-channels, mainly aimed at oil-water wells requiring testing techniques. Background technique [0002] Oilfield development is in the middle and late stages, and the casing damage is serious, and the inner diameter of the casing after subsidy repair often has a serious shrinkage problem. For layered injection and production, a packer is needed, which can be run downhole through the reduced diameter of the casing and set at the inner diameter of the normal casing. For this reason, the expandable packer with large expansion ratio is studied. The research of this type of packer mainly solves the material and processing problems of the rubber sleeve of the expandable packer. Because of the large expansion ratio, its ability to seal the pressure difference is remarkable. insufficient. [...

AI Technical Summary

Problems solved by technology

However, when developing the production profile testing method of horizontal wells, a packer is required, which can not only pass through the 3.5in tubing, but also pass through the cable and seal it. At the same time, it needs to change the flow path and meet the sealing requirements of the 7in casing. Sealing of the inner diameter, the existing packers of various types do not meet the functional requirements of special processes after inquiry

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