Drillable packer and setting tool

Abstract

The invention relates to the technical field of petroleum, in particular to a drillable packer and a setting tool. The drillable packer comprises an inner sleeve configured as a column, and a one-wayvalve module detachably sleeving the inner sleeve and comprising a valve body, a valve element, a cover piece and an elastic piece, wherein the valve body is provided with a valve cavity, an accommodating cavity and cement pulp holes radially distributed; the accommodating cavity is joined with the inner sleeve; the valve element is accommodated in the valve cavity, and extends out of the valve rod on the side deviated from the inner sleeve; the cover piece is detachably joined with the valve body for limiting the valve element in the valve body; the elastic piece sleeves the valve rod; one end of the elastic piece butts against the valve element, and the other end of the elastic piece butts against the cover piece; and the valve element is configured to compress the elastic piece to conduct the cement pulp holes when suffering from the effect of external force, and is returned to close the cement pulp holes under the effect of return force of the elastic piece when the external forcedisappears.

Description

technical field [0001] The invention relates to the field of petroleum technology, in particular to a drillable packer and a setting tool for staged oil recovery. Background technique [0002] Packers are mainly used to separate layers during oil recovery. Packers usually need to cooperate with setting tools to complete the sealing operation during use. The existing packer mainly includes an inner sleeve, a valve assembly, an upper slip, an upper taper sleeve, a rubber sleeve, a lower slip, a lower taper sleeve, and a convergent sleeve. Wherein, the valve assembly includes a valve body and a valve core. The inner sleeve is detachably engaged with the valve body, and the valve core is accommodated in a space defined by the inner cavity of the inner sleeve and the valve cavity of the valve body. The lower slip is located above the valve body, the lower taper sleeve, the rubber sleeve and the upper taper sleeve are set on the inner sleeve in turn, and retaining rings are arr...

AI Technical Summary

Problems solved by technology

When the cement slurry hole is opened, the 4-lobed arc-shaped sleeve of the packer valve core is in a bent shape, which is very prone to breakage, resulting in failure to close the cement slurry hole

In addition, since the packer descends from the wellhead to several thousand meters in the well, the sediment, crystallized salt and other sundries in the casing can easily enter the valve body through the cement slurry holes on the valve body of the packer, which is easy The space between the curved arc sleeve of the spool and the converging sleeve is blocked by these sundries, which leads to failure when the spool is lifted up to close the grout hole

Therefore, the above-mentioned packer is easily affected by debris in the casing during operation due to its own structural defects, resulting in failure of the isolation operation

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