Abstract: The present invention relates to environmentally friendly delayed crosslinking complexes that are useful in subterranean treatment fluids. One embodiment of the present invention provides a method of providing a treatment fluid having a first viscosity and includes: an aqueous base fluid, a viscosifying agent, a delayed crosslinking complex having: a metal and a ligand, the ligand having at least one hydroxyl group and at least one carboxylic acid group; and placing the treatment fluid in a subterranean formation. In some embodiments, the delayed crosslinking complex is compliant and/or the viscosifying agent is compliant.

Abstract: Spectroscopic analyses of complex mixtures within the matrix of a sample can oftentimes be complicated by spectral overlap of the constituents and/or the matrix, making it difficult to quantitatively assay each constituent therein. Methods for analyzing a sample can comprise: providing a sample comprising a matrix and one or more constituents therein; exposing the sample to electromagnetic radiation in a spectral region where the matrix optically interacts with the electromagnetic radiation, so as to acquire a spectrum of the matrix; and analyzing the spectrum of the matrix within a wavelength range where the matrix has a molar extinction coefficient of at least about 0.01 M?1mm?1 to determine at least one property of the sample, the at least one property of the sample being selected from the group consisting of a concentration of at least one constituent in the sample, at least one characteristic of the sample, and any combination thereof.

Abstract: Spectroscopic analyses of complex mixtures within a fluid phase can oftentimes be complicated by spectral overlap, making it difficult to analyze for each constituent therein. Methods for analyzing a treatment fluid can comprise: providing a treatment fluid comprising a fluid phase and one or more constituents therein; exposing the treatment fluid to electromagnetic radiation in a spectral region where the fluid phase optically interacts with the electromagnetic radiation, so as to acquire a spectrum of the fluid phase; analyzing the spectrum of the fluid phase to determine at least one property of the treatment fluid, the at least one property of the treatment fluid being selected from the group consisting of a concentration of at least one constituent in the treatment fluid, at least one characteristic of the treatment fluid, and any combination thereof; and introducing the treatment fluid into a subterranean formation.

Abstract: The present invention relates to environmentally friendly delayed crosslinking complexes that are useful in subterranean treatment fluids. One embodiment of the present invention provides a method of providing a treatment fluid having a first viscosity and includes: an aqueous base fluid, a viscosifying agent, a delayed crosslinking complex having: a metal and a ligand, the ligand having at least one hydroxyl group and at least one carboxylic acid group; and placing the treatment fluid in a subterranean formation. In some embodiments, the delayed crosslinking complex is compliant and/or the viscosifying agent is compliant.