Anhydrous foam generator for shale oil and gas reservoir fracturing as well as application thereof

Abstract

The invention discloses an anhydrous foam generator for shale oil and gas reservoir fracturing as well as application thereof. The anhydrous foam generator has the following structure: a sand adding port, a liquid CO2 second injection port and a safety valve are arranged at the top of a propping agent storage tank; the bottom of the propping agent storage tank communicates with a high-pressure gasand liquid mixer through a propping agent discharging pipe; the top of the propping agent storage tank communicates with a primary oscillator and a secondary oscillator through an exhaust pipe; a liquid CO2 first injection port, a N2 injection port and an anhydrous foam foaming agent injection port are formed in the side wall of the high-pressure gas and liquid mixer; and the side wall of the high-pressure gas and liquid mixer communicates with the primary oscillator through a liquid discharging pipe; and the primary oscillator, the secondary oscillator and a tertiary oscillator communicate with one another sequentially. According to the three tandem oscillation mode of the anhydrous foam generator, the anhydrous foam generator has the characteristic of efficient foaming, guarantees complete mixing of the liquid CO2, N2 and propping agent particles, enhances the foaming capability of the foaming agent for anhydrous foam fracturing, can generate uniform and compact anhydrous foam fracturing liquid, contributes to improving the fracturing efficacy and greatly reduces formation damage.

Description

technical field [0001] The invention relates to a water-free foam generator for fracturing shale oil and gas reservoirs and an application thereof, and belongs to the technical field of fracturing equipment for developing and utilizing shale gas and shale oil. Background technique [0002] my country is rich in shale gas and shale oil resources with huge reserves, and its efficient development is of strategic significance for optimizing my country's oil and gas energy structure. However, shale oil and gas reservoirs generally have small matrix pores and extremely low permeability, and it is difficult to realize the effective development and utilization of shale oil and gas by conventional oil and gas development ideas. The congenital lack of development of shale reservoirs determines that fracturing is an inevitable way to realize its industrial production and utilization, and its susceptibility to damage later puts forward strict requirements for reservoir protection. Trad...

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