2022 NAICS national industry in sector 21 Mining, Quarrying, and Oil and Gas Extraction
213111 Drilling Oil and Gas Wells
NAICS 213111 is the US industry code for drilling oil and gas wells. This U.S.
- Code
- 213111 (2022 NAICS)
- Title
- Drilling Oil and Gas Wells
- Part of
- Support Activities for Mining
- SBA small business limit
- Up to 1,000 employees
- Closest UK SIC
- 09100 (details)
Changes coming. The NAICS 2027 revision applies to data from 1 January 2027, and SBA proposed new size standards on 20 August 2026. The values on this page are the ones in force today; we update this page when the official files change.
Official definition
This U.S. industry comprises establishments primarily engaged in drilling oil and gas wells for others on a contract or fee basis. This industry includes contractors that specialize in spudding in, drilling in, redrilling, and directional drilling.
When to use a different code
Census classifies these close-sounding activities somewhere else. Businesses mainly engaged in:
- Performing exploration (except geophysical surveying and mapping) services for oil and gas on a contract or fee basis are classified in U.S. Industry 213112, Support Activities for Oil and Gas Operations.
- Performing geophysical surveying and mapping services for oil and gas on a contract or fee basis are classified in Industry 541360, Geophysical Surveying and Mapping Services.
Activities listed under 213111
The Census index assigns these 18 activities to this code. If your business matches one, this is your code.
- Directional drilling of oil and gas wells on a contract basis
- Drilling directional oil and gas field wells on a contract basis
- Drilling for gas on a contract basis
- Drilling for oil on a contract basis
- Drilling gas and oil field wells on a contract basis
- Drilling oil and gas field service wells on a contract basis
- Drilling water intake wells, oil and gas field on a contract basis
- Gas well drilling on a contract basis
- Oil and gas well drilling services (redrilling, spudding, tailing) on a contract basis
- Oil well drilling on a contract basis
- Reconditioning oil and gas field wells on a contract basis
- Reworking oil and gas wells on a contract basis
- Service well drilling on a contract basis
- Spudding in oil and gas wells on a contract basis
- Tailing in oil and gas field wells on a contract basis
- Water intake well drilling, oil and gas field on a contract basis
- Well drilling (i.e., oil, gas, water intake wells) on a contract basis
- Workover of oil and gas wells on a contract basis
SBA size standard for 213111
To count as a small business for SBA loans and federal contracts under NAICS 213111, your business (including affiliates) must not exceed 1,000 employees. Check your business.
Source: SBA table of size standards, effective March 17, 2023.
Closest UK SIC 2007 codes
There is no official one-to-one link between NAICS and UK SIC. These codes share the same international class (ISIC Rev. 4: 0910), so treat them as a starting point and check the definition.
Built from Census concordances 2022→2017 NAICS and 2017 NAICS→ISIC Rev. 4.
Similar codes to compare
Data last changed November 14, 2026. How this page is built.