Joint hoop, clamping seat and underground plugging system

Abstract

The invention relates to the field of petroleum underground construction, in particular to a joint hoop, a clamping seat and an underground plugging system. The joint hoop is a plastic deformation component, and an internal channel is formed in the axial direction of the joint hoop; the joint hoop comprises a sealing ring and a slip which are arranged to be of an integrated structure, wherein the outer surface of the sealing ring is sealed with the inner wall of a shaft after the sealing ring deforms in the radial direction; the slip is opened in the radial direction and anchored to the inner wall of the shaft; and a conical sealing plugging surface is arranged on an inner channel of the sealing ring and used for making surface contact with the outer surface of a plugging body to seal the inner channel. The conical sealing plugging surface is arranged, the plugging body corresponding to the conical sealing plugging surface is also a conical surface, and the two conical surfaces realize surface-to-surface contact, so that the reliability of sealing and plugging is improved; and meanwhile, the conical sealing plugging surface is directly arranged on the inner surface of the sealing ring, only one sealing plugging interface is arranged, compared with at least two existing sealing plugging interfaces, the probability of sealing and plugging failure is greatly reduced, and the underground sealing and plugging effect is greatly improved.

Description

technical field [0001] The invention relates to the field of petroleum underground construction, in particular to a joint collar, a clamp and an underground plugging system. Background technique [0002] Bridge plugs and ball seats are widely used in oil and gas well fracturing and acidizing wellbore isolation. In the construction of fracturing reconstruction, the usual practice is to set the ball seat or bridge plug at the designated position of the downhole sleeve through the cable or hydraulic setting tool, and then pump the fracturing ball to seal the ball seat or bridge plug set in the well The internal channel of the bridge plug is perforated in the casing above the setting position, and the setting tool is pulled out for fracturing reconstruction. After the above operations are completed, a full-bore wellbore needs to be formed: if the ball seat or bridge plug is a soluble structure and the fracturing ball is a soluble structure, it can dissolve by itself until the c...

AI Technical Summary

Problems solved by technology

[0003] The plugging of the existing bridge plug and ball seat is to put the fracturing ball into the ball seat of the center pipe of the bridge plug or the ball seat for sealing and sealing. The ball seat is generally set as a tapered hole. When the fracturing ball is put into the ball seat In the middle, the fracturing ball forms a line seal on the ball seat, and the effective sealing surface is small, so the sealing effect is not good and the reliability is poor

And generally at least include a central tube, one to two cone structures and one to two pair of slip structures, the structure is complex, the reliability is difficult to improve, and the total time required for dissolution is increased

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