A bridge plug for ball-free fracturing

Abstract

The invention discloses a bridge plug for ball-free fracturing, which comprises a central tube and an upper base, a sealing rubber tube, a setting tube, slips and a lower base sequentially nested on the central tube; the top of the central tube is connected with a cable, The bottom surface of the upper base is connected to the top surface of the sealing rubber cylinder, the sealing rubber cylinder is nested on the top of the setting cylinder, the slips are nested on the bottom of the setting cylinder, the bottom of the slips is in contact with the lower base, the lower base and the center pipe are connected by connecting pins; the lower base It is flexibly connected with the setting cylinder through the connecting piece; the inner wall of the through hole of the setting cylinder is provided with an annular groove, and the annular groove is provided with a groove. The cross section of the annular groove is trapezoidal. The side close to the slips coincides with the side of the annular groove close to the slips; the side of the annular groove close to the sealing rubber cylinder is used as the upper ball seat, the side of the groove close to the sealing rubber cylinder, and the side close to the opening of the groove is aligned with the The annular groove coincides with one side close to the sealing rubber cylinder.

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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