Ball seat

Abstract

The invention discloses a ball seat, and belongs to the technical field of oilfield flooding. The ball seat comprises a tubular upper connector, an outer barrel, a core pipe, a self-locking shear pin, a clamp spring, a check ring and a lower connector, wherein the upper connector and the lower connector are both connected with the outer barrel; an inner cavity of the lower connector is provided with a first inclined surface; an inner cavity of the core pipe is provided with a second inclined surface and the core pipe is connected with the outer barrel through the self-locking shear pin; the core pipe is provided with a first clamp spring groove, and the clamp spring is arranged in the first clamp spring groove; an inner cavity of the check ring is provided with a third inclined surface and shaped like a calabash formed by overlapping two communicating cylindrical cavities with the same diameter, the width of the overlapping surface is smaller than the diameter of a thrown ball, and the diameter of the cylindrical cavities is larger than the diameter of the thrown ball; a step is arranged on the wall of an inner cavity of the outer barrel; the upper end of the check ring and the step are coplanar, and the lower end of the check ring and the upper end of the lower connector are coplanar; and a second clamp spring groove is formed in the outer barrel, the self-locking shear pin is shorn off, the core pipe moves downwards, and the clamp spring is clamped in the second clamp spring groove. By means of the ball seat, the problems that the thrown ball is difficult to throw and returns to cause sealing failure of a water injection pipe column are solved, and the effect of effectively sealing the water injection pipe column is realized.

Description

technical field [0001] The invention relates to the technical field of oilfield water injection, in particular to a ball seat. Background technique [0002] Oil field water injection refers to: in the process of oil and gas field development, using water injection wells to inject water into the oil layer to supplement and maintain the pressure of the oil layer and increase the production of the oil and gas field. Oilfield water injection usually includes: layered water injection and general water injection. Among them, layered water injection refers to: setting a packer in an oil and gas well to separate oil layers with different properties (such as oil layer permeability), and then using a water distributor to perform Layered water distribution can control the water injection volume of oil layers with higher permeability, and strengthen the water injection volume of oil layers with lower permeability, thereby increasing the production of oil and gas fields. After the packe...

AI Technical Summary

Problems solved by technology

[0006] In order to solve the problem of difficulty in throwing the ball and the failure of the seal of the water injection string caused by the return of the ball from the ball seat, the invention provides a ball seat

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