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  2. Diamond Offshore Drilling - Wikipedia

    en.wikipedia.org/wiki/Diamond_Offshore_Drilling

    Shortly thereafter, Diamond M Corp. briefly changed its name to Diamond M-ODECO Drilling Inc. before becoming Diamond Offshore Drilling, Inc. in 1993. [5] In October 1995, the company once again became a public company via an initial public offering, listing on the New York Stock Exchange. [6] In April 1996, the company acquired Arethusa for ...

  3. Exploration diamond drilling - Wikipedia

    en.wikipedia.org/wiki/Exploration_diamond_drilling

    Exploration diamond drilling differs from other geological drilling (such as Reverse Circulation (RC) Drilling [3]) in that a solid core is extracted from depth, for examination on the surface. The key technology of the diamond drill is the actual diamond bit itself. [4] It is composed of industrial diamonds set into a soft metallic matrix.

  4. Pride International - Wikipedia

    en.wikipedia.org/wiki/Pride_International

    The company was founded in 1966 in Alice, Texas as Pride Oilwell Service Company. In 1978, the company was acquired by Dekalb Corporation. In August 1988, the company was spun out as a public company. [2] In 1996, the company acquired Quitral-Co. Saic, the largest drilling contractor in Argentina, for $140 million. [3] It also acquired Forasol ...

  5. Core sample - Wikipedia

    en.wikipedia.org/wiki/Core_sample

    Rock core samples, the product of a diamond rig. A pied butcherbird perches nearby. A core sample is a cylindrical section of (usually) a naturally-occurring substance. Most core samples are obtained by drilling with special drills into the substance, such as sediment or rock, with a hollow steel tube, called a core drill. The hole made for the ...

  6. Drill bit (well) - Wikipedia

    en.wikipedia.org/wiki/Drill_bit_(well)

    The most common cutting element in use today is the polycrystalline diamond cutter (PDC), a sintered tungsten carbide cylinder with one flat surface coated with a synthetic diamond material. The cutters are arranged on the blades of the bit in a staggered pattern with the diamond coated cutter surface facing the direction of bit rotation to ...

  7. Valaris Limited - Wikipedia

    en.wikipedia.org/wiki/Valaris_Limited

    By 1983, the company was only operating 6 rigs, although that number increased to 24 in 1984. By 1985, the worldwide employee count of the company was down to 500. [2] [5] Richard Rainwater's BEC Ventures made an investment in the company in 1986 and chose Carl F. Thorne to run the company, which he did until his retirement 20 years later. [6]

  8. Helmerich & Payne - Wikipedia

    en.wikipedia.org/wiki/Helmerich_&_Payne

    Helmerich & Payne Flex Rig drilling the Bakken. Helmerich & Payne, Inc. (/ ˈ h ɛ l m r ɪ k / HELM-rik) is an American petroleum contract drilling company engaged in oil and gas well drilling and related services for exploration and production companies [2] headquartered in Tulsa, Oklahoma, with operations throughout the world.

  9. Diamond cutting - Wikipedia

    en.wikipedia.org/wiki/Diamond_cutting

    [citation needed] The marquise can be cut into an oval diamond by any diamond cutter with a loss of 5 to 10% in total weight. [citation needed] For example, a 1.10-carat marquise shape would be a 1.00 oval cut diamond by rounding the sharp points and creating an oval which currently in the market has a much greater desirability and resale value ...