NOVEL VISCOUS FLUIDS SYSTEMS FROM PRODUCED AND FLOW BACK WATERS

摘要

In certain instances high levels of boron is present in produced or flowback water after it has been treated. The boron or borates tend to cause the guar to cross-link and become viscous too early which may cause undue wear or other problems with the surface equipment. It has been found that in the presence of low pH the viscosifier typically does not cross-link in the presence of a borate allowing the finished water to be used to hydrate the fluid. The fluid including the now hydrated linear gel is then subject to a chelating process so that the boron may be sequestered. Once the originally present borate is sequestered a slowly soluble borate is added to cause the linear gel to cross-link at the desired point in time.

主权项

1. A well treatment material method comprising:
lowering a pH of a finished water, hydrating a viscosifier with the finished water, chelating a boron present in the finished water and the viscosifier, raising a pH of the finished water and the viscosifier, and adding a slowly soluble borate to the finished water and the viscosifier.