Drilling-free blind plate well cementation device for double-base gap bridge inverted packer

Abstract

The invention discloses a drilling-free blind plate well cementation device for a double-base gap bridge inverted packer. The drilling-free blind plate well cementation device comprises a collision pressing rubber plug, the packer, a blind plate component and a centralizer, wherein the packer, the blind plate component and the centralizer are used for being connected with a casing pipe; the centralizer comprises at least one centralizing block set; each centralizing block set comprises at least two centralizing blocks which are used for being embedded into the casing pipe and slidably connected with the casing pipe, and the centralizing blocks are distributed in the circumferential direction of the casing pipe; and the centralizer further comprises a driving assembly used for driving the centralizing blocks to move so that at least parts of the centralizing blocks can protrude out of the outer wall of the casing pipe. According to the well cementation device, when the casing pipe is put into a well, the centralizing blocks of the centralizer are connected to the casing pipe in an embedded mode, well putting obstruction cannot be generated, after the casing pipe is put into the well, the centralizing blocks slidably extend out and can abut against the well wall outside the casing pipe, the centering degree of a casing pipe section near the packer and the packer can be adjusted at least, the packer can tightly block an annulus in the circumferential direction after expanding, good annulus sealing is achieved, thus the stability and quality of annulus cement pouring can be guaranteed, and the well cementation quality is improved.

Description

technical field [0001] The invention relates to the technical field of filling and cementing devices, and more specifically relates to a drilling-free blind plate cementing device for a double-base cross-bridge upside-down packer. Background technique [0002] Cementing is an indispensable and important link in the process of drilling and completion operations. It includes operations such as sealing the casing and the annular space between the casing and the well wall (the annular space, referred to as the annular space), and injecting slurry into the annular space. content. The cementing device used in the cementing process generally includes a blind plate for sealing the casing lumen, a packer for sealing the annulus, and a bumper plug after grouting. The packer is sleeved or connected to the casing, and generally consists of an inner tube and an outer expansion rubber tube. After water injection, the expansion rubber sleeve will expand, and then seal the annulus between...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a drilling-free blind plate cementing device with a double-base cross-bridge upside-down packer. When the casing is running downhole, the centralizer block is embedded and connected to the casing, so that there will be no hindrance for running into the well. The block slides out and can touch the well wall outside the casing. At least the casing section near the packer and the centering degree of the packer can be adjusted to ensure that the packer can seal the ring tightly in the circumferential direction after expansion. To achieve good annulus sealing, the stability and quality of cement pouring in the annulus can be guaranteed, and the problem in the prior art that the annulus is not tightly sealed due to poor casing centering and affects the quality of cementing can be solved

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