Bridge plug free of ball fracturing

Abstract

The invention discloses a bridge plug free of ball fracturing. The bridge plug free of ball fracturing comprises a center pipe, an upper base, a sealing rubber barrel, a setting barrel, a clamping tile and a lower base; the upper base, the sealing rubber barrel, the setting barrel, the clamping tile and the lower base are sequentially nested on the center pipe; a cable is connected to the top endof the center pipe; the bottom surface of the upper base is connected with the top surface of the sealing rubber barrel; the sealing rubber barrel is nested on the top of the setting barrel; the clamping tile is nested at the bottom of the setting barrel; the bottom of the clamping tile is in contact with the lower base; the lower base and the center pipe are connected through connecting pins; thelower base and the setting barrel are flexibly connected through a connecting piece; an annular groove is formed in the inner wall of a through hole of the setting barrel; a groove is formed in the annular groove; the cross section of the annular groove is trapezoidal, one side, close to the clamping tile, of the annular groove is taken as a lower ball seat; one side, close to the clamping tile,of the groove is coincided with one side, close to the clamping tile, of the annular groove; one side, close to the sealing rubber barrel, of the annular groove serves as an upper ball seat; and for one side, close to one side of the sealing rubber barrel, of the groove, the part, close to an groove opening, of the side surface is coincided with one side, close to the sealing rubber barrel, of theannular groove.

Description

technical field [0001] The invention relates to the technical field of downhole pressure dividing tools for fracturing in oil and gas fields, in particular to a bridge plug for ball-free fracturing. Background technique [0002] The single well production of tight oil and gas and shale oil and gas horizontal wells depends on the volume of the reservoir stimulation. The application proportion of the fracturing process is gradually increasing. This process is the main technology for the development of horizontal wells in unconventional oil and gas reservoirs in North America, with an application rate of more than 80%. key technologies. [0003] At present, the application rate of the bridge plug multi-stage fracturing process is as high as 80%. Its main working method is that the bridge plug is lowered to the predetermined position by the cable and then set by the setting tool. After the setting is completed, the target layer is fractured. Construction, after the constructio...

AI Technical Summary

Problems solved by technology

[0004] However, in the actual construction process, there are at least the following problems: after the bridge plug is set, it is necessary to throw a fracturing sealing ball from the ground, and the fracturing construction can only be started after the central channel of the bridge plug is blocked, which increases the operating procedures and At the same time, in order to send the fracturing plugging ball to the ball seat, additional pumping fluid needs to be added, resulting in waste. At the same time, this part of the pumping fluid will enter the upper fracturing interval, resulting in additional fluid intake and waste

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