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<a name="TOC"></a>**Table of Contents**
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# Subdomain "Well"
**Description:** A proposed, permitted or actual drilled hole in the ground designed to exchange (or facilitate the exchange of) fluids between a subsurface reservoir and the surface (or another reservoir), or to enable the detection and measurement of rock properties. A well consists of one or more wellbores, extending from the bottom of each wellbore up to the top of the Xmas tree on the wellhead.
* This subdomain belongs to the parent [Well](Domain-Well.md).
* Back to [Domain overview](../Domains.md).
* Back to [OSDU Forum Getting Started](https://osduforum.org/getting-started/osdu-data-definition-documentation).
## Types Governed by the "Well" Data Domain
* **master-data--Well** — [osdu:wks:master-data--Well:1.3.0](../master-data/Well.1.3.0.md)<br>_The origin of a set of wellbores._
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## Types Consumed by the "Well" Data Domain
* **master-data--ReferenceLevel** — [osdu:wks:master-data--ReferenceLevel:1.1.0](../master-data/ReferenceLevel.1.1.0.md)<br>_A reference level or horizontal reference surface, which can be re-used by many other entities. The area of use is indicated by data.SpatialLocation - as a polygon or as a point if used in context of a Well or Wellbore._
* **master-data--Risk** — [osdu:wks:master-data--Risk:1.1.0](../master-data/Risk.1.1.0.md)<br>_Possible risk potentially encountered during the run of a drilling program or a single string run._
* **work-product-component--Activity** — [osdu:wks:work-product-component--Activity:1.4.0](../work-product-component/Activity.1.4.0.md)<br>_Instance of a given activity_
* **work-product-component--DataQuality** — [osdu:wks:work-product-component--DataQuality:1.3.0](../work-product-component/DataQuality.1.3.0.md)<br>_This is used to store result from a run of Data Quality Metric Evaluation engine. Captures summary information, such as which Business rule-set(s) and rule(s) have been used, when this was run and by whom. Detailed result (such as which rule failed, for which meta data item and what was offending value causing the rule to fail) is meant to be made available in a file that is linked to this work-product component. Through Lineage Assertion, this can relate to the entities which were used for the run of Evaluation engine, such as a collection of wells whose meta data were inspected by using a set of rules._
* **work-product-component--DataQuality** — [osdu:wks:work-product-component--DataQuality:2.0.0](../work-product-component/DataQuality.2.0.0.md)<br>_This is used to store the result from a run of a Data Quality Metric Evaluation engine. Captures summary information, such as which rule-set(s) and rule(s) have been used, when this was run and by whom. Detailed results may be associated with a dataset._
* **work-product-component--WellLog** — [osdu:wks:work-product-component--WellLog:1.4.0](../work-product-component/WellLog.1.4.0.md)<br>_A well log is a data type that correlates a particular measurement or multiple measurements in a wellbore against depth and/or time within that wellbore. When plotted visually, well logs are typically long line graphs (called "curves") but may sometimes be discrete points or intervals. This schema object is intended for digital well logs, not raster log files or raster calibration files, but may be used for the latter in the absence of a defined OSDU schema for these use cases._
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