The pilot bit is then taken out of the borehole. A pilot bore is bored at the required location and depth utilising steering and a guidance system to establish a blind well. Single-entry wells are another name for them. In order to promote the activity of natural populations of microorganisms, typical bioremediation procedures augment the available nutrients or oxygen.īioventing – Increases the supply of oxygen to in situ native organisms, thereby enhancing bioremediation.īlind Well – A directionally-drilled, horizontal well that is drilled and completed from a single end. Microorganisms (bacteria or fungus) eat or change the toxic components, making them less harmful or tying them together to prevent migration.īioremediation – A technique for remediation that uses local microorganisms to decompose environmental pollutants. Sold under a variety of trade names.īioaugmentation – A method for enhancing cleanup via the introduction of microorganisms to break down environmental pollutants. Often employed in directional drilling.īentonite: Colloquially referred to as directional driller’s mud, this colloidal clay forms a slick, slurry, or gel when water is added to it. Allows for the drill string to be rotated, orienting the cutting head for steering corrections. Enlarges pilot bores during pull-back operations, enabling the installation of sleeves or carriers.īent Sub: A portion of drill stem that is offset behind the drill head. Bīack Reamer: A cutting head that connects to a drill string’s leading end. Auger boring equipment is likely to possess limited steering capacity. Auger flights wound in a helix rotate within a steel casing and remove spoil back to the driveshaft. This is also known as a well annulus after the well materials have been placed, and it is usually sealed near the surface in some way.Īuger Boring: Use of a rotating cutting head to form a bore between a reception pit and a drive pit. During drilling, drilling mud normally flows through the annulus of the borehole. The annulus of a borehole, for instance, is the free space between the drill string or well casing and the walls of the bore being drilled. The annular seal in a horizontal well is often made up of a bentonite plug, bentonite-cement grout, expanding polyurethane foam, an inflatable or other packer, or a mix of these materials.Īnnular Space: The annular space is the space between any lining for the pipe and the pipe itself.Īnnulus – The space between the components of a well or borehole. The seal keeps surface water out of the borehole and prevents air sparging or soil vapor extraction devices from short-circuiting into the atmosphere. The process, which is essentially the same as air sparging, is frequently paired with soil vapour extraction.Īnnular Seal – A physical barrier that runs the length of a borehole's annulus, often from the surface to a depth of 20 feet or greater. To improve biodegradation, engineers sometimes sparge for the purpose of increasing dissolved oxygen in groundwater and soil.Īir Stripping – Another method for removing volatile pollutants from ground water. The method is frequently used in conjunction with soil vapour extraction. Directional Drilling DefinitionsĪ B C D E F G H I J K L M N O P Q R S T U V W X Y Z AĪir Sparging – This method injects air below the water table, removing volatile pollutants from ground water. Directional drilling is somewhat new oil and gas industry, and many people find themselves confused with the terms especially when they are very similar to well drilling, but represent different things. Learn the basics and understand horizontal directional drilling terminology. Why Drill Directionally? Planning A Directional Well Path How To Drill Directionally? Horizontal Drilling Complex Wellsģ Definition Directional drilling is the science of deviating a well bore along a planned course to a subsurface target whose location is a given lateral distance and direction from the vertical.ĭirectional wells are deviated from vertical (straight) Directional wells are drilled with intentional control to hit a pre-determined target: inclination (angle) azimuth (direction).We’ve compiled this extensive glossary of the most common and frequently used directional drilling terms and phrases, to help foster better communication and understanding. Khalifah Al-Amri Senior Drilling & Workover EngineerĢ Outline Definition What Are Directional Wells ? Directional Well Types
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