Guar gum fracturing fluid is the most widely used working fluid in fracturing operation at present

but it has the problems of high dosage of guar gum

large residue and serious reservoir damage. Organic boron crosslinking agent is the main research direction of crosslinking agent of guar gum fracturing fluid system because of its excellent crosslinking performance

easy regulation of delayed crosslinking

complete gel breaking of fracturing fluid

reducing guar gum dosage and reducing reservoir damage caused by guar gum residue. This paper introduces the research progress of organic boron crosslinking agent in guar gum fracturing fluid system

discusses the crosslinking mechanism of organic boron crosslinking agent

focuses on the synthesis of organic boron crosslinking agent

and prospects the development direction. From the synthesis research

the organic boron crosslinking agent mainly has three methods: the composite preparation of various ligands

the preparation of long-chain multi head polar organic amine boron and the preparation of nano crosslinking agent

which has excellent performance in reducing the amount of guar gum and improving the sand carrying performance of fracturing fluid. In the future research

the key is to improve the crosslinking efficiency. The long-chain multi head polar structure is the main research direction. The optimization of organic ligands and reaction design will be the core problems.