Multifunctional well washing valve for oil field electric submersible pump production oil well

Abstract

The invention relates to a multifunctional well washing valve for an oil field electric submersible pump production oil well. The multifunctional well washing valve comprises a valve body, one end of the valve body is provided with a liquid inlet, the other end of the valve body is provided with a liquid discharge opening, and the valve body is provided with a well washing liquid opening communicated with a casing pipe annular cavity; the valve body is internally provided with a production channel and a well washing channel, and the production channel and the well washing channel are independent of each other and communicated with each other through a through hole; the production channel is internally provided with a liftable sealing part which has the one-way valve function, and the liftable sealing part can be subjected to well liquid pressure to lift and open the production channel in the production process and close the production channel in the well washing operation process; the well washing channel is internally provided with a sliding sealing part which can be ascended and descended in the well washing channel, and the sliding sealing part can be subjected to the well liquid pressure to be lifted and close the through hole and the well washing liquid opening in the production process and open the through hole and the well washing liquid opening due to drop of the well washing liquid pressure and shut off a well washing joint in the well washing process. Accordingly, cyclic well washing operation in the positive direction or the negative direction can be conducted at will, and no precedence order is required to follow.

Description

technical field [0001] The invention belongs to the technical field of petroleum downhole tools, and in particular relates to a multifunctional well flushing valve for oilfield electric submersible pump production wells. Background technique [0002] The well flushing valve is installed in the production well of the electric submersible pump in the oil field to provide the necessary circulation channel and oil unloading channel for the downhole operation and well flushing operation of the oil well. The existing well flushing valve adopts the shared or concentric structure of the production channel and the well flushing channel, which has the defect that the well flushing operation can only be performed in the forward direction first, and then in the reverse direction, such as the utility model patent with the publication number CN2608681Y; Or can only carry out the defect of well washing operation according to reverse first, then forward order, as publication number is the u...

AI Technical Summary

Problems solved by technology

The well flushing valve with this structure has a long working time in practice, consumes a lot of manpower and materials, and increases the labor intensity of operators and production costs.

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