Air core drilling is a method wherein hardened steels or blades are used to bore a hole in an unconsolidated formation. Air core drilling can reach a depth of 300 meters which is great for mineral mining. The air core drill bit has three blades which cut the soft rock formations, thereby removing the drill cuttings by injecting air into the hole through the annular area between the drill rod and inner tube. Basically, the technique is a part of shallow drilling requiring minimal site preparation.
The global Air Core Drilling Market value is anticipated to exceed USD 1.45 billion by 2025, according to a new report by Grand View Research, Inc. Rising investment in E&P activities across various unconventional energy sources to meet growing energy demand is expected to drive the market over the next nine years.
Different Methods of Drilling
Air core drilling comes in a number of forms. Dust drilling is the least expensive type of air drilling and requires no fluid system for clean-up. Dust drilling provides an ideal environment for use. Dust drilling cannot handle wellbore fluid influxes; these cuttings result in mud rings in the annulus which can lead to a risk of downhole fire if mud rings are not eliminated.
Mist drilling is drilling with liquids which is a mixture of soap and water. In mist drilling the rate of penetration is little slower. In foam drilling, the foam is a mixture of water, surfactants and air. The cutting carrying capacity is greater than dust drilling. Here, surfactants, water and air combine to create a stiff foam, which is then circulated as drilling fluid. The cutting carrying capacity is greater than dust drilling by 6-7 times.
Aerated drilling involves nitrogen or air being added to the liquid phase of the drilling fluid, thus lowering the effective mud weight. This method can be used with most types of drilling fluids. Nitrogen Membrane drilling minimizes the chance of downhole fire. Its US patent is held by Weatherford, owner of the biggest fleet of on-site generated membrane Nitrogen Production Units globally.
Global air core drilling market by application, 2014 – 2025 (USD Million)
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Further key findings from the report suggest:
Global air core drilling market, by application, 2025
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Grand View Research has segmented the air core drilling market on the basis of application, and region:
Air Core Drilling Application Outlook (USD Million, 2014 – 2025)
Air Core Drilling Regional Outlook (USD Million, 2014 – 2025)
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