Ball seat and ball throwing sliding sleeve

Abstract

The invention relates to a ball seat and a ball throwing sliding sleeve. The ball seat comprises a base body and a wear-resistant sleeve, wherein the base body is tubular and comprises a first inner diameter tube section; the inner diameter of the first inner diameter tube section is less than the inner diameter of the rest part of the base body; the wear-resistant sleeve is a thin-walled tube; the outer diameter of the wear-resistant sleeve is matched with the inner diameter of the first inner diameter tube section; the wear-resistant sleeve is arranged on the inner wall of the first inner diameter tube section in a sleeving manner; the hardness of the base body is lower than that of the wear-resistant sleeve. According to ball seat and the ball throwing sliding sleeve provided by the invention, during oil production, when flowing through the ball seat, the oil-containing liquid scours the wear-resistant sleeve when the flow speed is high and the flow is large, the wear-resistant sleeve is not damaged easily, and when the flow speed and the flow are reduced, the wear-resistant sleeve is easy to damage in a ball throwing fracturing way; in addition, the inner diameter of the base body is increased, so that the ball seat adapts to changes of the flow speed and the flow of the oil-containing liquid, the inner through diameter of the ball seat is adjusted, and the oil yield is increased.

Description

technical field [0001] The invention relates to the technical field of oil production, in particular to a ball seat and a ball-throwing sliding sleeve. Background technique [0002] Multi-stage ball-sliding sleeve fracturing is one of the important technologies for staged stimulation of oil and gas reservoirs. In this technology, the ball-sliding sleeve system provides a channel for the fracturing fluid in the pipe string to flow to the formation. Before fracturing, the sliding sleeve is closed; during the fracturing process, the sliding sleeve is opened by sending the fracturing ball to the ball seat to open the channel between the pipe string and the formation; after the fracturing operation is completed, the fracturing ball returns Drain to the ground. [0003] At present, most of the pitching sleeve ball seats processed and produced in China are made of a single material, such as alloy materials or ball-milled cast iron. Since the alloy material has high and uniform ha...

AI Technical Summary

Problems solved by technology

Since the alloy material has high and uniform hardness, good wear resistance, and high contact fatigue performance after quenching, it is not easy to expand the channel in the ball seat by drilling; although the ductile cast iron has good machining performance, Easy to drill out, but due to low hardness, it is easy to be damaged when the oily liquid has a large sand content and a large flow rate

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