Source: https://clu-in.org/techfocus/default.focus/sec/Horizontal_Remediation_Wells/cat/Resources/
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CLU-IN | Technologies > Remediation > About Remediation Technologies > Horizontal Remediation Wells > Resources
The 2017 How to Evaluate Alternative Cleanup Technologies for Underground Storage Tank Sites: A Guide for Corrective Action Plan Reviewers, published by EPA's Office of Underground Storage Tanks, includes an appendix (Appendix A) that summarizes the use of horizontal wells for remediating underground storage tank (UST) sites. The appendix summarizes the equipment and procedures used to drill, install, and develop horizontal wells. It also describes advantages and limitations of HRWs and their use in conjunction with various remediation technologies. In addition, EPA's 1997 Design Guidelines for Conventional Pump-and-Treat Systems includes a section on horizontal and slant wells.
Most states and municipalities have requirements for the licensing of drillers and permitting for the installation and decommissioning of wells that would apply to horizontal wells. Additional specifications for drilling and installing conventional vertical wells for monitoring or remediation might apply. The California Department of Transportation document, CALTRANS Encroachment Permits: Guidelines and Specifications for Trenchless Technology Projects , contains a five-page section on HDD requirements for the installation of utilities. Other states and municipalities generally have guidelines for directional drilling focused on traffic control, noise control, and managing drilling fluids. Environmental practitioners are advised to contact state and local agencies prior to starting HDD projects.
Laton, W.R.
Remedation 30:27-31(2019).
Paper describes use of a predicted ZOI using a mathematical and hydrogeological approach to evaluate the cost-benefit of a horizontal versus vertical well system.
Reconsidering Horizontal to Vertical Well Ratios for Site Clean-up
The 29th Annual International Conference on Soil, Water, Energy, and Air, San Diego, CA, March 18-21, 2019 March, 23 slides.
Directional drilling has been used for a variety of purposes; utilities, dewatering, and remedial activities. Cutting costs for remedial activities is always of consideration. The costs to clean-up a site via traditional vertical extraction wells, versus the use of a horizontal well system, need to be reconsidered based upon today's remedial challenges. Traditionally, it has been stated that a single horizontal well is worth 4-11 vertical wells. This seems arbitrary, in that both depth of the system and hydrogeological conditions play a large role that is not considered. A better way to evaluate the cost benefit of one system over another is to base it on the number of vertical wells per linear foot of directional well, and base it more on zone of influence of both designs.
CALTRANS Encroachment Permits: Guidelines and Specifications for Trenchless Technology Projects
California Department of Transportation, 2018.
Pages 13-18 of this document deals with horizontal directional drilling and covers soil investigations, pre-construction and site evaluation, installation requirements, drilling fluids management, drilling and back reaming, site restoration, and other requirements.
Koenigsberg, S.S., E. R. Piatt, and L.I. Robinson
Remediation 28(4):45-50(2018) [Abstract].
Decreasing costs and a strategic shift, which can be characterized as "greater flexibility," are two factors that have brought about a resurgence of horizontal well systems. Article explains how movement from monolithic single well systems to segmented well systems is a next-generation advancement in site assessment and remediation.
USEPA (EPA 510-B-17-003), October 2017.
Appendix A summarizes the equipment and procedures used to drill, install, and develop horizontal wells for remediating UST sites. It also describes the potential to incorporate HRWs into site remedies such as air sparging and soil vapor extraction, hot air or steam injection, bioremediation, chemical injection, and LNAPL removal, as well as plume containment, injection of treated water, and sampling.
Improved Slant Drilling Well for In situ Remediation of Groundwater and Soil at Contaminated Sites
Furukawa, Y., Mukai, K., Ohmura, K., and T. Kobayashi.
Environmental Science and Pollution Research 24(7): 6504-6511(2017) [Abstract]
The slant well is a potentially useful technique in settings, such as working factories, but its use is technically challenging because of the need for high drilling accuracy and the difficulty in sealing the slanted bores. Study investigated a technique for slant drilling using water-swelling materials as sealants to install wells for treating contaminated soil and groundwater. Tracer tests were also conducted to investigate the accuracy of drilling.
Bardley, D.S.
National Driller Magazine, October 2015.
Magazine column summarizes the numerous factors involved in calculating the setback distance needed to install a horizontal well.
Enhancing the Hydraulic Conductivity of Horizontal Remediation Wells
Lubrecht, M.
21st Annual International Petroleum Environmental Conference, Houston, Texas. 20 slides, October 13-16, 2014.
Slide presentation outlines how well design, drilling method, well construction, and development can be performed to enhance recovery of groundwater from horizontal remediation wells.
Horizontal Wells Target the Source: Horizontal Environmental Well: Drilling Fluids – Is Bentonite a Four Letter Word?
21st Annual International Petroleum Environmental Conference, Houston, Texas. 18 slides, October 13-16, 2014.
Slide presentation describes two common drilling fluids for horizontal wells bentonite-based and bio-polymer and outlines the factors that affect selection of these drilling fluids at contaminated sites.
In-Situ Testing, Operation and Troubleshooting of Horizontal Remediation Wells
Sequino, M. and K. Martin.
Slide presentation summarizes testing (e.g., remedial feasibility testing, vertical well testing, in situ as-built testing, and follow-up testing), troubleshooting techniques, and well development procedures to ensure horizontal remediation wells meet intended goals.
Horizontal Environmental Drilling 101: An Introduction to the Means and Methods for Horizontal Environmental Well Installation
2014 Arizona Institute of Professional Geologists and Arizona Hydrological Society National Conference, Prescott, Arizona, 23 slides, September 2014.
Slide presentation outlines the techniques and materials used to drill and install horizontal wells for environmental applications. Advantages, disadvantages, and installation challenges of the technology also are discussed.
Van Heest, G. and M. Sequino.
29th Annual International Conference on Soils, Sediments, Water, and Energy, University of Massachusetts at Amherst. October 21-14, 2013.
Paper discusses the use of HRWs (four air sparging and three SVE wells) to treat a large gasoline release at an airport. Suggests the importance of the larger zone of influence of HRWs over vertical wells.
NiSource Multi-Species Habitat Conservation Plan, Appendix J, 42 pp, June 2013.
Appendix J summarizes how horizontal wells are drilled and installed for habitat conservation projects for the NiSource utility company. It includes a 1994/95 paper by C.W. Hair, "Site Investigation Requirements for Large Diameter HDD Projects." This paper was prepared for New Advances in Trenchless Technology: An Advanced Technical Seminar, held February 5-8 in St. Joseph, Missouri.
Horizontal Directional Drilling: A Green and Sustainable Technology for Site Remediation
Lubrecht, M.D.
Environmental Science & Technology 46:2484-2489 (2012)
Article highlights the potential for horizontal wells to improve sustainability of site remediation by maximizing the net benefit of human activities by reducing energy consumption, preventing or mitigating environmental damage, and addressing local economic and social factors.
Horizontal Wells for Groundwater Remediation: How A Technology That Revolutionized the Oil Industry is Used to Remediate Groundwater
Van Heest, Gary.
EM Magazine, 23 pp, June 2013.
Paper explains the process of drilling and installing HRWs, their advantages, and how they've been adapted for site remediation.
U.S. Department of the Interior, Bureau of Reclamation, Desalination and Water Purification. Research and Development Program Report No. 151, 72 pp, 2008.
Report reviews angle wells, horizontal directionally drilled wells, and other extraction technologies to determine their suitability for seawater desalination facility construction. It reviews their capabilities, challenges, and potential improvements; assesses key design and construction needs; identifies key areas for specialized testing and development; and identifies next steps for technology development.
Ho, Pei-Yi Joy, Master's thesis, University of Waterloo, ON, Canada. 118 pp, 2007.
Directed Technologies Drilling.
Horizontal Environmental Well Handbook, 35 pp, December 2004.
Handbook chapter provides a history of horizontal drilling and descriptions of drilling equipment and approaches, locating techniques and equipment, drilling materials, remediation technologies that use horizontal wells, well development procedures, and health and safety concerns.
Horizontal Environmental Wells: Part 1 , Part 2 , and Part 3
National Driller Magazine, June, July, and August 2002.
In 2002, National Driller Magazine published a 3-part series that analyzed information contained in a catalog of horizontal environmental wells. The catalog, initiated with a survey in 1993 and subsequently updated, identified 1,142 horizontal environmental wells that were installed in the United States through the end of 2000. While not a complete listing, the catalog provided a record of how the industry had evolved since the late 1980s. Part 1 identifies summary points based on the data, a history of horizontal well use, and descriptions of environmental applications; Part 2 describes well design and drilling; and Part 3 describes well materials, drilling fluids, and well development, and contains an analysis of wells installed to date, including their locations, depths, remediation applications, well materials, and geology.
Ariaratnam, S.T. and E.N. Allouche.
Construction Congress VI: Building Together for a Better Tomorrow in an Increasingly Complex World, ISBN: 9780784404751, pp 435-444, 2000.
In recent years, a growing number of consultants and owners have considered the use of horizontal remediation wells as an alternative solution to the removal and containment of contaminants. Currently, engineers rely on complex systems of vertical wells or barrier wall systems which inject and/or extract subsurface water or vapor for on-site soil and ground water remediation. However, in sites containing fine-grained soil or widespread contamination, numerous vertical wells are required to adequately treat the plume. Horizontal directional drilling makes it possible to install a single horizontal well to contact a much larger contaminated area. Because fewer wells are required, the cost of extraction and treatment over the life of the project may be substantially reduced, In addition, horizontal wells can be installed beneath buildings or environmentally sensitive areas, to reach contaminants inaccessible by other methods. Construction of such wells may be achieved using horizontal directional drilling, a remotely guided drilling technique that makes it possible to drill horizontal boreholes over long distances along straight or curved profiles and alignments. An overview of horizontal environmental well technology including discussion of the advantages and limitations of this technology is presented. Greater utilization of horizontal wells depends on the availability of design and construction guidelines. Parameters and design principles that should be considered in such installations are presented.
Ground-Water Remediation Technologies Analysis Center, TO-96-02, 17 pp, October 1996.
Technology summary report provides a brief overview of an environmental remediation technology, including an introduction to its general principles, reported applicability and utilization, and cited advantages/disadvantages.
Innovative Technology Summary Report: Horizontal Wells
U.S. Department of Energy, DOE/EM-0378, 28 pp, 1998.
Report summarizes demonstration projects conducted at several DOE sites. It describes how horizontal wells are installed, their performance, and technology applicability and alternatives.
Robert M. Cohen, James W. Mercer, Robert M. Greenwald, and Milovan S. Beljin
EPA Ground Water Issue, EPA/540/S-97/504, 38 pp, September 1997.
Guidelines on use of pump and treat for contaminated water includes a section on horizontal and slant wells.
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