Oil Well Types

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An oil well is an instrument which, when a driller taps it, brings oil from the ground to the Earth's surface. The oil itself, according to the United States Department of Energy, exists as small droplets in the pores of rocks. As an oil producer, you need to know about the size and number of pores in a rock, and the speed at which the oil can flow through these pores. Also, you need to know about the different types of wells.


An injection well is one in which a worker might inject water or gas into the well to stimulate oil production. According to the Flowmeter Directory website, two types of injection wells exist -- a water injection well and a gas injection well. In the former type, you inject water into the ground to bring the oil out of the well. A gas injection well uses gas to increase the pressure underground to extract the oil.


The purpose of an appraisal well is evaluation. According to the Oil Gas Glossary, oil rig workers use this type of well to run buildup tests, to test the stems of drills, and to gather fluid and core samples, among other evaluative functions.


According to the Oil Gas Glossary, this type of well is one that an offshore drilling unit digs to produce hydrocarbons that well diggers cannot otherwise produce from development wells from a platform rig, or other permanent drilling source. Well diggers will drill several of these as a cost-cutting measure to avoid the expense of building a new platform.


According to the Oil Gas Glossary, an offset well is a well that a driller may place next to another one. As the Babylon Dictionary points out, the distance between the two wells depends upon factors such as the spacing regulations that region has in force, or whether the adjoining well produces oil or gas.


This term refers to a well that produces oil naturally. According to the Vast Energy website, a flowing well is one that produces without the aid of a pump. Hydrocarbons naturally flow through this structure between the formation of the well to the wellhead.