Anti-high salinity cleaning viscous slippery water, crosslinking agent, viscosity-varying drag-reducing agent and preparation method

Abstract

The invention belongs to the technical field of oil and gas well reservoir fracturing reconstruction. The invention discloses a high-salinity clean and viscous slippery water, a cross-linking agent, a viscosity-changing drag-reducing agent and a preparation method. The cross-linking agent consists of the following Component composition in weight percent: sodium borate decahydrate, sodium citrate, zirconium oxychloride, ethylene glycol, glycerol, sodium chloride and the balance are water; Composed of water; the viscous slippery water is made of viscous crosslinking agent and base liquid; the base liquid is composed of viscous drag reducer and water; the weight ratio of viscous drag reducer to water is 0.1-1 : 999-999.9; the volume-to-weight ratio of the viscous cross-linking agent to the base liquid is 0.1-0.3mL: 499.7-499.9g; the preparation method of the cross-linking agent comprises steps: A, preparing alcohol-based solution; B, preparing alcohol C. The alcohol-based mixed solution is stirred and reacted under airtight conditions, and cooled to obtain the crosslinking agent. The viscosity of the base liquid of the present invention increases after crosslinking without affecting the drag-reducing effect of the liquid, and can well satisfy fracturing construction.

Description

technical field [0001] The invention belongs to the technical field of fracturing reconstruction of oil and gas well reservoirs, and in particular relates to anti-high salinity clean viscous slippery water, a crosslinking agent, a viscous variable drag reducing agent and a preparation method. Background technique [0002] Slippery water is a fracturing fluid system for hydraulic fracturing of shale oil and gas reservoirs, and is one of the key fluids for shale gas development. Compared with the traditional gel fracturing fluid system, the slick water fracturing fluid system is widely used in shale gas development because of its high efficiency and low cost. [0003] Compared with the traditional gel fracturing fluid system, the slick water fracturing fluid system is widely used in shale gas development because of its high efficiency and low cost. As the core additive of the slick water fracturing fluid system, the drag reducer directly determines the performance and applica...

AI Technical Summary

Problems solved by technology

[0006] In order to solve the above-mentioned problems existing in the prior art and to overcome the problem that the existing conventional slick water cannot adjust the viscosity at any time according to the construction situation, the purpose of the present invention is to provide a kind of anti-high salinity clean and viscous slick water, crosslinking agent, and viscous water. Drag reducing agent and preparation method, by adding a specific cross-linking agent for slick water to change the viscosity of slick water during construction, so as to ensure fracturing construction

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