CROSS-LINKING TITANIUM AND ZIRCONIUM CHELATES AND THEIR USE

摘要

Title CROSS-LINKING TITANIUM /A ZIRCONIUM CHELATES /A THEIR USE Water-soluble N,N-bis-(2-hydroxyethyl)-glycine/metal chelates represented by the formula: wherein R is H or alkyl (1-12C); M is Ti or Zr; k is a number in the range between 0 and 1, p is a number in the range between 1 and 2, and k + p = 2 (in particular embodiments: k = 1 and p = 1; k = 0 and p = 2; and k = 0.5 and p = 1.5). The chelates can be used as crosslinking agents in hydraulic fracturing fluids and in gels that are used for selectively plugging permeable zones in subterranean formations or for plugging subterranean leaks.