A perforating and fracturing integrated device and method based on carbon dioxide blasting technology

Abstract

The invention provides a perforation and fracturing integrated device on the basis of carbon dioxide blasting technologies. The perforation and fracturing integrated device comprises a liquid storagepipe and a perforation frame. An upper pipe orifice of the liquid storage pipe is provided with a filling piston, an activator is arranged at the bottom of the filling piston, a lower pipe orifice ofthe liquid storage pipe is provided with an energy release head, a shearing piece is arranged in the energy release head, a pressure initiator is arranged in the liquid storage pipe, the lower end ofthe liquid storage pipe is connected with the perforation frame, a plurality of perforation bullets which are connected with one another by a detonating fuse are arranged in the perforation frame, bullet outlets are formed in the perforation frame, the detonating fuse is connected with the pressure initiator, the liquid storage pipe is filled with liquid carbon dioxide, the activator can be excited, the liquid storage pipe can be heated, the internal pressure can rise, the pressure initiator can be triggered, the detonating fuse can be ignited, the perforation bullets can be detonated to be injected into rock mass of strata to form perforation cavities, the internal pressure of the liquid storage pipe can continue rising, accordingly, the shearing piece can be crushed, and carbon dioxide gas can be exhausted to strike the perforation cavities to form fracturing regions. The perforation and fracturing integrated device has the advantages that the difficult problems of complicated in-well perforation and fracturing programs and insufficient fracturing volumes can be solved by the aid of the perforation and fracturing integrated device, extensive fracture networks can be created by the perforation and fracturing integrated device, and the safety can be improved.

Description

technical field [0001] The invention relates to the technical field of perforation and fracturing of oil and gas wells and geothermal wells, in particular to an integrated perforation and fracturing device and method based on carbon dioxide blasting technology. Background technique [0002] As the central link of oil and gas well completion engineering, perforation realizes oil and gas production by communicating the wellbore and formation. Fracturing is to create fractures in the formation, improve the flow environment of oil and gas underground, and make them more smoothly gather in the perforated cavity. Perforating and fracturing play a vital role in increasing oil and gas production, and compound perforating is a technology that combines the two. [0003] At present, most composite perforations are based on shaped energy perforation, and the composite propellant is introduced into the perforating gun as secondary energy. When the shaped energy perforating bullet is pe...

AI Technical Summary

Problems solved by technology

However, it is extremely unsafe to use gunpowder in the high-temperature and high-pressure environment of medium-deep wells, which may cause the perforating gun to burst or the casing to be damaged, affecting the perforating effect

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