A highly reliable soluble bridge plug

Abstract

The invention belongs to the technical field of oilfield downhole tools, and in particular relates to a highly reliable soluble bridge plug, which includes a mandrel, a rubber sleeve, an upper slip, a lower slip, an upper cone and a lower cone. The mandrel It is a hollow structure, and the lower end of the mandrel is provided with a limiting part. The lower vertebral body, lower slips, rubber tube, upper slips, and upper vertebral body are fitted on the mandrel in turn from bottom to top, and the mandrel is applied when setting. Under the axial extrusion force, the lower slip slides along the lower vertebral body to achieve radial expansion and finally anchors on the inner wall of the casing, and the upper slip slides along the upper vertebral body to realize radial expansion and finally anchors to the inner wall of the casing. The cylinder radially expands and realizes the seal with the casing, and the mandrel above the upper vertebral body is fitted with a spring seat. The invention solves the problem that the soluble bridge plug is not firmly anchored in the downhole slips and causes the bridge plug to slip, and also solves the problem of waiting for the bridge plug to dissolve after fracturing. The invention shortens the waiting time and improves the reliability of anchoring .

Description

technical field [0001] The invention belongs to the technical field of oil field downhole tools, and in particular relates to a soluble bridge plug with high reliability. Background technique [0002] Soluble bridge plugs have been used more and more in staged fracturing operations of unconventional oil and gas. After the soluble bridge plugs are completed, no post-treatment is required, and no debris is left in the well. Its structure includes body, rubber cartridge and slips, all of which are soluble materials, and the soluble bridge plug is set and discarded by special setting tools. [0003] Dissolution of soluble bridge plugs begins after they are lowered into the well. The time control of using soluble bridge plugs is the key to ensure that the bridge plugs do not dissolve and fail before the fracturing operation is completed. Therefore, the manufacture of soluble bridge plugs inevitably tends to prolong the dissolution time. Avoid premature failure, which creates new...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem of too long waiting time for dissolution in the background technology, as well as the problem that the reliability of slip anchoring decreases due to dissolution, and the bridge plug slips during fracturing, the present invention provides a highly reliable soluble bridge plug. Shorten the waiting time and improve the reliability of anchoring

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