The goal of this project is to develop and demonstrate the use of readily available natural gas collected at the wellhead as a primary fracturing fluid. The work proposes to develop, validate, and demonstrate affordable non-water-based and non CO2-based stimulation technologies, which can be used instead of, or in tandem with, water-based hydraulic fracturing fluids to reduce water usage and the volume of flowback fluids. The process will use natural gas at wellhead supply conditions and produce a fluid at conditions needed for injection.
Southwest Research Institute (SwRI), San Antonio, TX 78238
Schlumberger Technology Corporation (SLB), Sugar Land, TX 77478
Chevron Energy Technology Company, Houston, TX 77002
Fracturing fluids are composed of approximately 90 percent water. One of the principal drawbacks to hydraulic fracturing is its excessive water use. Each application of hydraulic fracturing consumes between three and seven million gallons of water. During the fracturing process, some of the fracturing fluid is permanently lost and the portion that is recovered is contaminated by both fracturing chemicals and dissolved solids from the formation. The recovered water, or flowback, represents a significant environmental challenge because it must be treated before it can be reintroduced into the natural water system. Although there is some recycling of flowback fluids for future fracturing, the majority of the flowback water is hauled from the well site to a treatment facility or to an injection well for permanent underground disposal.
To mitigate these issues, an optimized, lightweight, and modular surface process involving natural gas liquefaction, compression, and injection will be developed and field tested to replace water as a cost-effective and environmentally-clean fracturing fluid. Using natural gas produced from the well for hydraulic fracture stimulation will result in a near zero consumption of water. The gas, in a liquefied state, is injected as a fracturing fluid; it will mix with newly-released formation gas and both will be extracted to the surface. This eliminates the collection, waste, and treatment of large amounts of water, and reduces the environmental impact of transporting and storing the fracturing fluid.
The primary benefit of this program is the ability to utilize natural gas as the primary fracturing fluid, thus, reducing water use. Traditional fracturing operations throughout the U.S. use a substantial amount of water, much of which is lost permanently or is difficult and expensive to decontaminate. In this research, natural gas will be readily obtained, either from the wellhead (produced gas) that is typically located near the well site or from nearby processing facilities. This technology will eliminate much of the environmental impact associated with transporting fracturing fluids to and from the well site. The process does not depend on large amounts of water, which will minimize the flowback water disposal problem associated with traditional hydraulic fracturing. Once the well begins producing natural gas, the natural gas that was used as the primary fracturing fluid can be introduced back into the pipeline.
There are many significant benefits to the process, some of which are:
Work in budget period 4 began early in 2019. The activities in budget period 4 focus on identifying the effects of natural gas mixtures and elevated operating temperatures on the stability of natural-gas-based foam. These activities will include laboratory tests of foam rheology using natural gas mixtures and pilot-scale tests of natural-gas-based foam at elevated operating temperature.
Development and Field Testing Novel Natural Gas Surface Process Equipment for Replacement of Water as Primary Hydraulic Fracturing Fluid (Aug 2017)
Presented by Griffin Beck, Southwest Research Institute, 2017 Carbon Storage and Oil and Natural Gas Technologies Review Meeting, Pittsburgh, PA
Development and Field Testing Novel Natural Gas Surface Process Equipment for Replacement of Water as Primary Hydraulic Fracturing Fluid (Aug 2016)
Presented by Griffin Beck and Sandeep Verma, Southwest Research Institute, 2016 Carbon Storage and Oil and Natural Gas Technologies Review Meeting, Pittsburgh, PA