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2. Key Energy Services - Wikipedia

   en.wikipedia.org/wiki/Key_Energy_Services

   Process to recover lost or stuck equipment in the well bore utilizing a "fishing tool” or “jar”. The FRS operations also cut windows in well sidewall casings for horizontal re-entries. Rental Services Ancillary equipment such as generators, drill collars as well as proprietary tools such as the Hydra-Walk r automated pipe handling system.

3. Drilling rig - Wikipedia

   en.wikipedia.org/wiki/Drilling_rig

   Drilling the Bakken Formation in the Williston Basin Large hole drilling rig for blast-hole drilling. A drilling rig is an integrated system that drills wells, such as oil or water wells, or holes for piling and other construction purposes, into the earth's subsurface.

4. Well drilling - Wikipedia

   en.wikipedia.org/wiki/Well_drilling

   Well drilling can be done either manually or mechanically and the nature of required equipment varies from extremely simple and cheap to very sophisticated. Managed Pressure Drilling (MPD) is defined by the International Association of Drilling Contractors (IADC) as “an adaptive drilling process used to more precisely control the annular ...

5. Patterson-UTI - Wikipedia

   en.wikipedia.org/wiki/Patterson-UTI

   Patterson Drilling Company was founded in 1978 by Cloyce Talbott and Glenn Patterson. [1] UTI Energy was formed in 1986 to purchase Universal Well Services, Union Supply Company, Triad Drilling Company, and International Petroleum Services Company. In 2001, Patterson Drilling acquired UTI Energy and renamed the company Patterson-UTI Energy. [3]

6. Ensign Energy Services - Wikipedia

   en.wikipedia.org/wiki/Ensign_Energy_Services

   Ensign is one of the world's land-based drilling and well servicing contractors serving crude oil, natural gas and geothermal operators. [verification needed] The company’s premium service is focused on contract drilling with complementary services such as directional drilling, underbalanced and managed pressure drilling, rental equipment, well servicing and production services. [4]

7. NOV Inc. - Wikipedia

   en.wikipedia.org/wiki/NOV_Inc.

   NOV Inc., formerly National Oilwell Varco, is an American multinational corporation based in Houston, Texas.It is a worldwide provider of equipment and components used in oil and gas drilling and production operations, oilfield services, and supply chain integration services to the upstream oil and gas industry.