4-inch half-sleeve layered fracturing pipe column and fracturing method

Abstract

The invention discloses a 4-inch half-sleeve layered fracturing pipe column and a fracturing method. The 4-inch half-sleeve layered fracturing pipe column comprises a constant-pressure sliding sleeve,packing assemblies, a hydraulic anchor, a releasing packer and a connecting pipe, wherein a plurality of the packing assemblies are arranged; the connecting pipe comprises a first connecting pipe, aplurality of second connecting pipe and a third connecting pipe; the upper end of the constant-pressure sliding sleeve is connected with the packing assemblies through the first connecting pipe; the plurality of packing assemblies are sequentially connected from bottom to top through the plurality of second connecting pipes; the packing assembly at the uppermost end is connected with the hydraulicanchor through the third connecting pipe, the upper end of the hydraulic anchor is connected with the releasing packer, the constant-pressure sliding sleeve, the packing assemblies, the hydraulic anchor and the releasing packer are all provided with inner through holes, and the diameters of the inner through holes of the packing assemblies, the hydraulic anchor and the releasing packer are all larger than the diameter of the inner through hole of the constant-pressure sliding sleeve.

Description

technical field [0001] The invention belongs to the technical field of downhole operation tools for oil field exploration and development, and in particular relates to a 4.5-inch casing layered fracturing string and a fracturing method, which are used for large-scale volume fracturing reconstruction of 4.5-inch casing wells in ultra-low permeability reservoirs. , to increase single well production. Background technique [0002] The ultra-low permeability reservoirs in existing oilfields are affected by poor physical properties, and the establishment of the displacement system is slow. After conventional fracturing is put into production, the production of a single well is low and the decline is large. The mixed water fracturing measures carried out with "sand volume and large liquid volume" have a significant increase in production and a good effect in stabilizing production. The authorization number is CN205445569U, and the Chinese patent document with the authorization da...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to overcome the deficiencies of the above-mentioned prior art, provide a 4-inch half-casing layered fracturing string and a fracturing method, which overcomes 1 in the prior art: complex downhole tools for layered fracturing strings, It is difficult to unblock, and the risk of downhole accidents is high; 2: The existing fracturing string cannot be applied to oil wells with 4.5-inch small casing completed in separate layers; 3: Conventional layered fracturing strings are affected by the existing Due to the limitation of the well body structure, the construction displacement cannot meet the requirements of large displacement, etc.

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