Categories : American inventions Chinese inventions Drilling technology Water wells. However, when water is encountered, mist, foam, aerated, or slug drilling can be used. Sheriff's Encyclopedic Dictionary of Applied Geophysics, fourth edition. From Wikipedia, the free encyclopedia. Content of PetroWiki is intended for personal use only and to supplement, not replace, engineering judgment.
Well drilling - Wikipedia
Other disadvantages to air drilling include: possible downhole fires and explosions, sloughing of formations when dry or wet , and soft formations. Navigation menu Personal tools Log in. A fixed cutter bit is one where there are no moving parts, but drilling occurs due to shearing, scraping or abrasion of the rock. Eskandarian, S.
Log in to your subscription
Taking another look at the risk profile for air drilling in presence of hydrocarbons. Like mist drilling, Nitrogen membrane drilling minimizes chance of downhole fire. Rock Mech.
Drilling for the exploration of the nature of the material underground for instance in search of metallic ore is best described as borehole drilling. Membrane Nitrogen. There are three types of formations: soft, medium and hard. Large water-bearing formations are the biggest enemies of air drilling, and the rate of formation water influx that can be handled is not defined.