Flowback verses first-flush: new information on the geochemistry of produced water from mandatory reporting
Abstract
Unconventional oil and gas development uses the subsurface injection of large amounts of a variety of industrial chemicals, and there are concerns about the return of these chemical to the surface with water produced with oil and gas from stimulated wells. Produced water, including any flowback of injected fluids, must be managed so as to protect human health and the environment, and understanding the chemistry of produced water from stimulated wells is necessary to ensure the safe management of produced water. In 2014, California instituted mandatory reporting for all well stimulations, including sampling produced water two times and comprehensive chemical characterization of fluids injected and fluids recovered from stimulated wells. In this study, we analyzed data from mandatory reporting with the objective of closing previously identified data gaps concerning oil-field chemical practices and the nature of flowback and produced water from stimulated wells. It was found that the plug-flow conceptual model of flowback developed in shale formations, where salinity increases over time as produced water is extracted, was not appropriate for characterizing produced water from unconventional wells in these oil reservoirs, which are predominately diatomite and sandstones. In these formations stimulation caused a "first-flush" phenomena, where salts and metals weremore »
- Authors:
-
- Univ. of the Pacific, Stockton, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Publication Date:
- Research Org.:
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
- Sponsoring Org.:
- USDOE Office of Fossil Energy (FE); USDOE Office of Fossil Energy and Carbon Management (FECM)
- OSTI Identifier:
- 1542364
- Alternate Identifier(s):
- OSTI ID: 1484814
- Grant/Contract Number:
- AC02-05CH11231; IA0000018; AC02-05CH1123
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Environmental Science: Processes & Impacts
- Additional Journal Information:
- Journal Volume: 21; Journal Issue: 2; Journal ID: ISSN 2050-7887
- Publisher:
- Royal Society of Chemistry
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 54 ENVIRONMENTAL SCIENCES; 58 GEOSCIENCES
Citation Formats
Stringfellow, William T., and Camarillo, Mary Kay. Flowback verses first-flush: new information on the geochemistry of produced water from mandatory reporting. United States: N. p., 2018.
Web. doi:10.1039/c8em00351c.
Stringfellow, William T., & Camarillo, Mary Kay. Flowback verses first-flush: new information on the geochemistry of produced water from mandatory reporting. United States. https://doi.org/10.1039/c8em00351c
Stringfellow, William T., and Camarillo, Mary Kay. Thu .
"Flowback verses first-flush: new information on the geochemistry of produced water from mandatory reporting". United States. https://doi.org/10.1039/c8em00351c. https://www.osti.gov/servlets/purl/1542364.
@article{osti_1542364,
title = {Flowback verses first-flush: new information on the geochemistry of produced water from mandatory reporting},
author = {Stringfellow, William T. and Camarillo, Mary Kay},
abstractNote = {Unconventional oil and gas development uses the subsurface injection of large amounts of a variety of industrial chemicals, and there are concerns about the return of these chemical to the surface with water produced with oil and gas from stimulated wells. Produced water, including any flowback of injected fluids, must be managed so as to protect human health and the environment, and understanding the chemistry of produced water from stimulated wells is necessary to ensure the safe management of produced water. In 2014, California instituted mandatory reporting for all well stimulations, including sampling produced water two times and comprehensive chemical characterization of fluids injected and fluids recovered from stimulated wells. In this study, we analyzed data from mandatory reporting with the objective of closing previously identified data gaps concerning oil-field chemical practices and the nature of flowback and produced water from stimulated wells. It was found that the plug-flow conceptual model of flowback developed in shale formations, where salinity increases over time as produced water is extracted, was not appropriate for characterizing produced water from unconventional wells in these oil reservoirs, which are predominately diatomite and sandstones. In these formations stimulation caused a "first-flush" phenomena, where salts and metals were initially high and then decreased in concentration over time, as more produced water was extracted. Although widely applied to meet regulatory requirements, total carbohydrate measurement was not found to be a good chemical indicator of hydraulic fracturing flowback. In conclusion, mandatory reporting closed data-gaps concerning chemical use, provided new information on acid treatments, and allowed more detailed analysis of hydraulic fracturing practices, including comparison of water use by geological formation.},
doi = {10.1039/c8em00351c},
journal = {Environmental Science: Processes & Impacts},
number = 2,
volume = 21,
place = {United States},
year = {Thu Dec 06 00:00:00 EST 2018},
month = {Thu Dec 06 00:00:00 EST 2018}
}
Web of Science
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