Cement extruding bridge plug

Abstract

The invention discloses a cement extruding bridge plug, and belongs to the field of oil well tools. The bridge plug comprises a setting feeding mechanism, a setting mechanism and an extruding injection mechanism. The setting feeding mechanism comprises a cylinder barrel, a center pipe and an upper joint. A lifting sleeve is arranged on the outer wall of the center pipe. A first through hole communicating with the center pipe is formed in the lifting sleeve. A second moving piece and a first moving piece are sequentially arranged in the cylinder barrel and are connected through a first shearingpiece. The lower end of the first moving piece is sequentially provided with a supporting sleeve and a claw spring. The setting mechanism comprises a rubber barrel shaft, a sealing rod and a switch sleeve, wherein the sealing rod and the switch sleeve are located in the rubber barrel shaft and are sequentially connected with the lower end of the center pipe. A fifth limiting piece, a slip, a coneand a rubber barrel are arranged on the outer wall of the rubber barrel shaft. The extruding injection mechanism comprises a steel ball, a ball seat, a second shearing piece, a throwing sleeve, a third shearing piece and a sealing plug, wherein the ball seat is arranged in the center pipe, the second shearing piece is arranged on the ball seat, the throwing sleeve is connected with the lifting sleeve and the rubber barrel shaft, the third shearing piece is arranged on the throwing sleeve, and the sealing plug is arranged in the rubber barrel shaft. The bridge plug realizes the integration ofcement extrusion.

Description

technical field [0001] The invention belongs to the technical field of oil well tools, in particular to cement squeezing bridge plugs. Background technique [0002] Cement-squeezing bridge plugs are mainly used in the construction process of oilfield development, such as production testing, downhole operations, oil and gas layer transformation, formation testing, and injection-production layer adjustment. Plugging or permanent plugging, or secondary cementing of channeling outside the casing. [0003] The cement-squeezing bridge plug used in the related technology mainly includes: a bridge plug setting tool, a squeeze string and a fishing tool. The pipe string carries out the cement extrusion operation, and after the cement extrusion operation is completed, it is lowered into the salvage tool to recover the cement extrusion bridge plug. [0004] The inventor found that the related technology has the following technical problems: [0005] After the setting is completed, it...

AI Technical Summary

Problems solved by technology

[0005] After the setting is completed, it is necessary to run a squeeze pipe string into the bridge plug for extrusion injection. The construction process is complicated, and it is easy to cause the bridge plug to be unsealed after the squeeze pipe string is run in, which may easily lead to extrusion failure, and the construction period is long , high operating costs

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