Patent ID: 9534167
Date: 2017-01-03
CPC Classifications: C07F,C09K,E21B

Claim:
1. A method of fracturing a subterranean formation comprising the steps of: a. blending together water and a hydratable polymer capable of gelling in the presence of a crosslinking agent; b. allowing the hydratable polymer to hydrate to form a hydrated polymer solution; and c. adding a crosslinking agent comprising a polyboronic compound to the hydrated polymer solution to produce a crosslinked fracturing fluid, wherein the polyboronic compound is of the formula: wherein: s is 1 to 6; each R each r is independently selected from 2 to 6; W is a substituent of the formula: v is either 2 or 3, provided v cannot be both 2 and 3 in the same compound; each R each R X is —Cl or —Br; and R d. pumping the fluid into the subterranean formation to fracture the formation.