Fracturing packer for barefoot well

Abstract

The invention relates to a fracturing packer for a barefoot well, comprising an upper connector, an upper rubber cylinder sheath, an inner pipe, a rubber cylinder, a lower rubber cylinder sheath, a one-way pressure limiting valve body, a one-way valve, a pressure limiting valve and a lower connecter, wherein the rubber cylinder is sleeved outside the inner pipe, the upper connector, the inner pipe, the one-way pressure limiting valve body and the lower connector are sequentially connected, the lower part of the upper rubber cylinder sheath covers the upper part of the rubber cylinder, the upper part of the upper rubber cylinder sheath is sleeved outside the upper connector, the upper part of the lower rubber cylinder sheath covers the lower part of the rubber cylinder, the lower part of the lower rubber cylinder sheath is sleeved outside the one-way pressure limiting valve body, the one-way pressure limiting valve body is provided with a vertical hole channel and a radial communicated hole, the vertical hole channel and the radial communicated hole are communicated, the one-way valve is installed on the vertical hole channel, and the pressure limiting valve is installed under the vertical hole channel. Duo to the pressure limiting valve, overpressure of the rubber cylinder is prevented, long-term effective working of the rubber cylinder is ensured, thereby the invention is suitable for fracturing operation of the barefoot well in an oil field; and the rubber cylinder is permanently kept in an expansion status by designing the one-way valve, therefore, the invention is suitable for the requirements for permanently plugging the bottom of the barefoot well in the oil field.

Description

Open hole fracturing packer technical field The invention is a device for plugging the bottom of an open hole in an oil field, and is a fracturing packer for an open hole. Background technique The expansion packer used for oilfield water injection is to expand the rubber sleeve outward when the pressure inside the rubber sleeve is higher than the external pressure of the rubber sleeve, so as to realize the sealing of the annular space of the oil casing. The current expandable packer will be unsealed when there is no pressure inside, and is not suitable for permanent sealing of the bottom of the open hole in the oil field. Some expandable packers are equipped with a one-way mechanism inside, which can guarantee It will not be unsealed when there is no pressure difference, but the time for keeping the unsealed is limited, and it is not suitable for the requirements of permanent plugging of the bottom of the open hole in the oil field. It does not have a pressure limiting mec...

AI Technical Summary

Problems solved by technology

The current expandable packer will be unsealed when there is no pressure inside, and is not suitable for permanent sealing of the bottom of the open hole in the oil field. Some expandable packers are equipped with a one-way mechanism inside, which can guarantee It will not be unsealed when there is no pressure difference, but the time for keeping the unsealed is limited, and it is not suitable for the requirements of permanent plugging of the bottom of the open hole in the oil field. It does not have a pressure limiting mechanism, which may easily cause overpressure damage to the rubber cartridge Requirements for sealing the bottom of the well

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