Fracturing tools and staged fracturing pipe column

Abstract

The invention provides fracturing tools and a staged fracturing pipe column. Each fracturing tool comprises a closed expansion type self-deblocking packer and a sandblaster connected below the closed expansion type self-deblocking packer; the closed expansion type self-deblocking packer comprises a first barrel body, a rubber barrel, a liquid flow switch and a first inner sliding sleeve; an annular groove is formed in the outer side wall of the first barrel body in a concave mode; the rubber barrel is embedded in the annular groove, seals a notch of the annular groove, can radially expand after fluid flows into the annular groove from a liquid flow hole and can retract after the fluid in the annular groove flows out; the liquid flow switch is installed in an installation hole, and connecting and disconnecting between the liquid flow hole and the annular groove are controlled through the liquid flow switch; and the first inner sliding sleeve can be axially and slidably arranged on the inner side of the first barrel body in a sleeved mode. The staged fracturing pipe column comprises the fracturing tools which are sequentially connected in series from top to bottom. According to the fracturing tools and the staged fracturing pipe column, seat sealing is safe and reliable; automatic deblocking can be achieved; the pipe column only needs to be lifted for one time after fracturing; and pipe column lifting is easy.

Description

technical field [0001] The invention relates to the technical field of oilfield fracturing, in particular to a fracturing tool and a staged fracturing string used for oilfield fracturing. Background technique [0002] Staged fracturing is one of the important technologies to realize the effective production of low-permeability and tight oil and gas reservoirs. It has the characteristics of highly targeted fracturing intervals and continuous fracturing process. Especially for refracturing of old wells, the only technical means is to use staged fracturing strings for staged reconstruction. The packer in the staged fracturing string is the core of the staged fracturing technology, and it must meet the basic requirements of sealing and lifting. There are two main types of fracturing packers, one is expansion packer and the other is compression packer. [0003] The fracturing string based on the expandable packer adopts the staged fracturing technology of lifting the string pac...

AI Technical Summary

Problems solved by technology

[0003] The fracturing string based on the expandable packer adopts the staged fracturing technology of lifting the string packer. Lifting the pipe string requires moving the wellhead, which is inefficient and risky; the fracturing pipe string composed of compression packers adopts a layered fracturing technology that can be mechanically isolated and released step by step. After the fracturing is completed, the pipe is lifted The main problem of column unsealing is the difficulty of unsealing. The main reason is that the packer needs several tons of load when unsealing. If there is sand on the rubber tube (almost certainly exists), the unsealing load will be even greater, often causing the packer to unpack. The device is unsealed, and the pipe string cannot come out

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