Fracturing bridge plug

Abstract

The invention relates to the technical field of unconventional gas pool multi-stage fracturing and particularly relate to a fracturing bridge plug. The bridge plug is used for multi-stage fracturing modification of casing horizontal wells and has the quick removing performance. The bridge plug comprises a fracturing ball, a central tube, a shear pin, a slip, a slip ring, a tapered body, an end rubber sleeve, a middle rubber sleeve and a guiding shoe. The bridge plug is simple in structure and capable of saving the drilling time of every bridge plug of the horizontal well multi-stage fracturing greatly and meeting the low cost requirement and the environment-friendly requirement of exploration and development of low-permeability unconventional oil gas of China.

Description

technical field [0001] The invention relates to the technical field of multistage fracturing of unconventional gas reservoirs, in particular to a fracturing bridge plug used for staged fracturing reconstruction of casing horizontal wells and having rapid drilling and removal performance. Background technique [0002] Bridge plugs have been used for many years. Traditional bridge plugs are made of metal and run into the well through cables or tubing. In horizontal wells, ordinary bridge plugs cannot be lowered to the predetermined position through cables. Therefore, it is necessary to design a composite fracturing bridge plug that is resistant to high temperature and high pressure, has excellent milling performance, and can pump the bridge plug to the predetermined position through surface pumping. [0003] Although conventional fracturing bridge plugs have good sealing performance, high pressure difference resistance, and long sealing time, they can also be ground and milled...

AI Technical Summary

Problems solved by technology

[0003] Although conventional fracturing bridge plugs have good sealing performance, high pressure difference resistance, and long sealing time, they can also be ground and milled, but they are prone to midway seat sealing during grinding and milling, and the milling time is long, and the metal debris after milling Large specificity and difficult flowback, so it cannot be applied to staged fracturing of horizontal wells

[0004] Although ordinary non-metallic drillable bridge plugs can solve the above problems, when grinding multiple bridge plugs in multi-stage fracturing of horizontal wells, after grinding the sealant cartridges of the previous stage of bridge plugs, the latter stage and the front stage The pressure between the first-stage bridge plugs will directly impact the drill bit and cause damage to the drill bit. Therefore, a staged fracturing reconstruction for casing horizontal wells is invented. The fracturing bridge plug with fast drilling performance is particularly prominent.

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