Device and method for intelligently controlling ball throwing by aid of gears for multi-stage horizontal well fracturing

Abstract

The invention discloses a device and a method for intelligently controlling ball throwing by the aid of gears for multi-stage horizontal well fracturing. The device comprises an annular pipeline, a ball throwing module, a ball throwing detecting device (6) and a liquid collecting device (14). The annular pipeline comprises a fracturing liquid main pipeline, a special-shaped connecting pipe (4), an annular connecting pipe (18) and a straight connecting pipe (17), the special-shaped connecting pipe (4), the annular connecting pipe (18) and the straight connecting pipe (17) are sequentially communicated with one another to form a U-shaped through pipe, the fracturing liquid main pipeline comprises a large-diameter section (9) of the fracturing liquid main pipeline and a small-diameter section (10) of the fracturing liquid main pipeline, a side of the large-diameter section (9) of the fracturing liquid main pipeline is communicated with the special-shaped connecting pipe (4), the special-shaped connecting pipe (4) is communicated with the liquid collecting device (14), and the ball throwing module is arranged above the special-shaped connecting pipe (4). The device and the method have the advantages that repeated ball throwing can be remotely controlled during multi-stage fracturing without pump stopping, ball throwing sequences can be adjusted, the ball throwing success rate is high, and the device is convenient to use and can be reused.

Description

technical field [0001] The invention relates to a ball throwing device, in particular to a gear-controlled intelligent ball throwing device and method for multi-stage fracturing of a horizontal well. Background technique [0002] Since the 1990s, with the increasing demand for oil and gas resources and the advancement of science and technology, staged fracturing technology has been developed rapidly and widely used. The ball launcher is an indispensable equipment in the staged fracturing process. In the fracturing process using the intelligent sliding sleeve as the downhole intelligent switch, the opening and closing of the intelligent sliding sleeve is controlled by putting in the tag ball to realize the fracturing of the target formation. [0003] At present, the pitching process can be divided into pump-off pitching and pressurized pitching. The traditional process of stopping the pump and throwing the ball is to remove the plug at the ball hole at the wellhead after st...

AI Technical Summary

Problems solved by technology

[0004] 1. The requirements for bearing pressure are high, and the volume of the space is large. Since the ball chamber is directly connected to the main channel of fracturing due to the work under pressure, the pressure bearing design requirements for the device are very high;

[0005] 2. The efficiency of pitching is low. The existing ball chambers arranged vertically under pressure are designed for steel balls. When new low-density electronic tagged balls appear, the probability of tagged balls entering the fracturing pipeline is low;

[0006] 3. The function of preventing misoperation of pitching is lacking;

[0007] 4. The installation steps of the label ball are cumbersome

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