Magnetic response type nano fracturing fluid cross-linking agent and preparation method thereof

Abstract

The invention discloses a magnetic response type nano fracturing fluid cross-linking agent and a preparation method thereof, and is characterized in that the magnetic response type nano fracturing fluid cross-linking agent is prepared by firstly hydroxylating the surfaces of magnetic response type nano particles, then aminating and modifying the surfaces of the magnetic response type nano particles by using an amino silane coupling agent, and finally further condensing the aminated magnetic response type nano particles and a conventional fracturing fluid cross-linking agent. The preparation process is mild in condition, simple and easy to implement and easy to control, and regulation and control of the magnetic response type nano fracturing fluid cross-linking agent are realized by controlling the hydroxylation and amination degrees of the surfaces of the magnetic response type nano particles, so that the performance of the cross-linking fracturing fluid is improved; the synthesis process adopts an aqueous solution system, and has the advantages of greenness and environmental protection; according to the cross-linking agent and the fracturing fluid crosslinked by the cross-linking agent, the rheological property and the flowing direction of the cross-linking agent can be regulated and controlled through an external magnetic field, fracturing crack initiation is controlled, cracks are induced to divert and expand, and a complex crack network system is formed; and after gel breaking, the crosslinking fracturing fluid is recycled by utilizing the magnetism of the crosslinking agent, so that the cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of oil and gas field development, and in particular relates to a magnetic response nano-fracturing fluid crosslinking agent and a preparation method thereof. Background technique [0002] Low-permeability oilfield reserves account for an increasing proportion of the world's undeveloped petroleum geological reserves, and the rational development of low-permeability reservoirs plays a vital role in increasing reserves in the petroleum industry. my country's low-permeability and tight oil and gas reservoirs are characterized by wide distribution, high content, and many types. They are distributed in the Ordos Basin, Jiuquan Basin, Jianghan Oilfield, Jilin Oilfield, and western Daqing Oilfield. Therefore, low-permeability reservoirs have very important economic and strategic value in oil and gas production; however, such reservoirs are dense in lithology, low in permeability, low in natural production, and diffi...

AI Technical Summary

Problems solved by technology

Thickeners include plant gums, cellulose derivatives and synthetic polymers, which are generally used to form cross-linked fracturing fluids by cross-linking with various ions, but currently there are often problems such as low cross-linking efficiency, poor temperature resistance and shear resistance; By adding nanomaterials (such as nano-SiO 2 、TiO 2 However, the cross-linked fracturing fluid formulated with nanomaterials is easy to adsorb, retain, and separate from oil and water after flowback in the reservoir. Difficulty, increased operating costs and risks

Images