Low-dosage guar multinuclear cross-linking agent

Abstract

The invention relates to a low-dosage guar multinuclear cross-linking agent for the field of petrochemical engineering, the low-dosage guar multinuclear cross-linking agent is prepared from water, polyhydric alcohol, polyol, carbohydrate, boron compound and inorganic acid salt. The preparation method of the cross-linking agent comprises the following steps: putting water, polyhydric alcohol and polyol in a reactor to heat to 60 DEG.C, reacting for 90-120min, and then adding a boron compound, carbohydrate and the inorganic acid salt, warming to 80-90 DEG.C, reacting for 3-6 hours, regulating pH to 8-10 by using sodium hydroxide, reacting for 1-3 hours to obtain the low-dosage guar multinuclear cross-linking agent. The low-dosage guar multinuclear cross-linking agent is capable of providing a plurality of cross-linking centers, the use concentration of the guar can be greatly reduced, the concentration of the guar is reduced to more than 30% of conventional system dosage, the dosage of the cross-linking agent is less, and the cross-linking is delayed, the damage of the guar system fracturing fluid to the stratum is obviously reduced, and the use performance of the fracture fluid is guaranteed.

Description

Technical field [0001] The invention belongs to the technical field of preparation of petrochemical products, and relates to a low-dosage guar gum polynuclear crosslinking agent. Background technique [0002] At present, in the domestic fracturing fluid market, guar fracturing fluid products account for more than 90%. In view of the fact that the main factors of guar gum system damage to oil reservoirs are residues, water insolubles and damage caused by poor system compatibility (damage rate to formation is 40-80%), the most direct way to reduce guar residues and insolubles is Through modified guar gum. Studies have shown that the best way to prevent the guar gum system from harming reservoirs is to develop modified products that can reduce the amount of guar gum. The more successful method used in the past is to modify into hydroxypropyl guar gum, but the residue cannot be modified. Reduce to lower, and the cost is higher. In addition, through the study of cross-linking agent...

AI Technical Summary

Problems solved by technology

The advantage of borax crosslinking agent is low cost, and the disadvantage is that it delays crosslinking poorly and has poor temperature resistance. If it is added too much, it will easily become brittle.

The advantage of organic boron crosslinking agent is that it has good delay and has a certain temperature resistance compared with borax. The disadvantage is that the comprehensive cost is high

The advantages of organic titanium and zirconium cross-linking agents are good temperature resistance and good retardation, and their disadvantages are mainly high cost. Compared with borax cross-linking agents, organic cross-linking agents cannot solve the problem of high guar gum consumption and high comprehensive cost. question