Patent ID: 9725641
Date: 2017-08-08
CPC Classifications: C09K

Claim:
1. A method of producing a hydrofracturing fluid consisting essentially of approximately 98 to 99.5 weight percent water and proppant, and a chemicals package, said method comprising: blending the chemicals package with an aromatics-free oil soluble monoester derived from one or more of: a) an alkali-catalyzed transesterification reaction; and/or b) a reaction of fatty acids with a monoalcohol, and at least one compound from the group consisting of inorganic acids, biocides, breakers, corrosion inhibitors, crosslinkers, gels, iron control agents, potassium chloride, oxygen scavengers, pH adjusting agents, scale inhibitors, surfactant and mixtures of any of the foregoing and with said water and proppant; and adding one or more crude glycerin streams to said chemicals package and said glycerin stream(s) is included to provide glycerin in a concentration of about 0.5 volume percent or less of the total of the hydrofracturing fluid to assist in preventing scale formation and/or to act as a friction reducer, wherein said monoester is about 0.1 percent or less of the hydrofracturing fluid, said crude glycerin streams being selected from the group consisting of transesterification crude glycerin, neutralized transesterification crude glycerin, heterogeneous catalyzed transesterification crude glycerin, saponification crude glycerin, hydrolysis crude glycerin and crude glycerin; and optionally one or more of the crude glycerin streams is a bottoms product obtained by the distillation of a crude glycerin stream selected from the group consisting of transesterification crude glycerin, neutralized transesterification crude glycerin, hydrolysis crude glycerin, saponification crude glycerin and mixtures thereof and said bottoms product comprises at least approximately 7% of the glycerin contained in one or more overhead products consist essentially of glycerin and optionally water and at least part of organic materials having higher molecular weight than glycerin contained in said bottoms product is removed by employing an ultrafiltration and/or nanofiltration step.