A drillable fracturing bridge plug

Abstract

The invention provides a drilling type fracture bridge plug and belongs to the field of fracture well completion in the petroleum industry. A whole kava is adopted by the drilling type fracture bridge plug, and anchoring teeth in shapes of oblique triangles are evenly distributed on an outer surface of the kava; and a check valve is designed in a pressure transmission channel of the bridge plug. The kava can be evenly adhered to an inner wall of the sleeve when the bridge plug is sealed, stress is even, and damage to the sleeve is small. A check valve mode is adopted by the drilling type fracture bridge plug to guarantee that a piston does not draw back after sealing, an anti-retraction mechanism is removed, and the length of the bridge plug is shortened. When the fracture is carried out, a structure of the pressure transmission channel of the bridge plug enables pressure in a bridge plug pressure chamber to be no less than maximum pressure of construction, and plugging reliability of the bridge plug is guaranteed. All components except for a spring at the position of the check valve can be made of non-metallic materials, so that the bridge plug is guaranteed to be easy to drill, complete drilling can be achieved, and operation time is greatly shortened.

Description

technical field [0001] The invention belongs to the field of fracturing well completion in the petroleum industry, and in particular relates to a drillable fracturing bridge plug, which is suitable for fracturing research wells of oil wells and gas wells, especially fracturing completion of high-pressure, high-temperature and high-sulfur natural gas wells . Background technique [0002] In order to better develop low-permeability reservoirs, fracturing stimulation is an essential measure. Due to the long well section and thick oil layers, the effect of general fracturing is poor. Using layered and staged fracturing can improve production efficiency. Fracturing effect. At present, staged fracturing with fracturing bridge plugs is widely used at home and abroad to effectively develop low-permeability reservoirs. At present, there are mainly two types of bridge plugs used for fracturing and completion in oilfields: fishable and drillable. During large-scale fracturing, the bi...

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Problems solved by technology

[0009] From the above analysis, it can be seen that there are many documents and patents that record drillable bridge plugs in the prior art, but none of the mentioned drillable bridge plugs involves the field of fracturing, and it has not been found that the drillable bridge plugs can achieve low impact on the casing. Damaged bridge plug

In addition, the anti-retraction mechanism of the existing bridge plug increases the length of the bridge plug, so the drilling time of the existing drillable bridge plugs is longer, ranging from 2-3 hours to more than ten hours. low work efficiency

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