Inorganic boron crosslinking agent and preparation method thereof

Abstract

The invention relates to an inorganic boron crosslinking agent and a preparation method thereof. Currently, a water-based fracturing fluid is generally used for carrying out reservoir reconstruction at home and abroad; a fracturing fluid system with borax as a crosslinking agent has poor temperature resistance and is just used for superficial-reservoir reconstruction; and the temperature resisting capacity of the fracturing fluid with an organic boron crosslinking agent is improved, however, the amount of a fracturing fluid gel breaker is large, gel breaking is difficult, and the permeability damage on a reservoir and a support crack is large relatively. The inorganic boron crosslinking agent comprises the following components in parts by weight: 200-350 parts of water, 100-200 parts of boric acid, 300-400 parts of xylitol, 150-200 parts of sodium hydroxide. The preparation method comprises the following steps: proportioning according to the amounts of the components, adding water in a reaction kettle, and adding boric acid until boric acid is fully dissolved; slowly adding xylitol under the condition of stirring; reacting for 60-90 minutes at the temperature of 40-50 DEG C; and then slowly adding sodium hydroxide until sodium hydroxide is completely dissolved so as to obtain the inorganic boron crosslinking agent. According to the invention, the temperature resistance of the fracturing fluid is improved through improving the pH value of the crosslinking agent; and the delay crosslinking time of the inorganic boron crosslinking agent is prolonged through adding polyol.

Description

technical field [0001] The invention relates to an inorganic boron crosslinking agent used in the production stimulation process of oil and gas reservoir fracturing reconstruction and a preparation method thereof. Background technique [0002] At present, water-based fracturing fluids are generally used for reservoir reconstruction at home and abroad, and boron inorganic or organic substances are used as cross-linking agents. The temperature resistance of the fracturing fluid system is poor, and it can only be used for shallow reservoir stimulation; the temperature resistance of the fracturing fluid using organic boron cross-linking agent is enhanced, but it leads to a large amount of gel breaker and difficult gel breaking in the fracturing fluid. The permeability of the reservoir and supporting fractures is greatly damaged, and the above factors affect the stimulation effect to a certain extent. Contents of the invention [0003] The technical problem solved by the prese...

AI Technical Summary

Problems solved by technology

[0002] At present, water-based fracturing fluids are generally used for reservoir reconstruction at home and abroad, and boron inorganic or organic substances are used as cross-linking agents. The temperature resistance of the fracturing fluid system is poor, and it can only be used for shallow reservoir stimulation; the temperature resistance of the fracturing fluid using organic boron cross-linking agent is enhanced, but it leads to a large amount of gel breaker and difficulty in breaking the fracturing fluid. The permeability of the reservoir and supporting fractures is greatly damaged, and the above factors affect the stimulation effect to a certain extent