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Downhole oilfield apparatus comprising a diamond-like carbon coating and methods of use

a technology of diamond-like carbon coating and oilfield apparatus, which is applied in the direction of fluid removal, earth drilling and mining, borehole/well accessories, etc., can solve the problem that the prior art of oilfield has been restricted to dlc us

Inactive Publication Date: 2008-10-02
SCHLUMBERGER TECH CORP
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  • Claims
  • Application Information

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Benefits of technology

[0010]In accordance with the present invention, apparatus and downhole methods of use thereof are described, the apparatus comprising a base metal or alloy having a diamond-like carbon (DLC) coating thereon comprising amorphous and/or crystalline carbon produced by a process such as physical vapor deposition (PVD), and CVD-like processes, including a process known as the hollow cathode plasma ion immersion process and disclosed by SubOne Technology (www.sub-one.com), the coating presents at...

Problems solved by technology

As may be seen, oilfield prior art has been restricted to uses of DLC and similar carbon coatings in drill bits, specialty optical sensors, and fluid-conveying-only tubes.

Method used

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  • Downhole oilfield apparatus comprising a diamond-like carbon coating and methods of use
  • Downhole oilfield apparatus comprising a diamond-like carbon coating and methods of use
  • Downhole oilfield apparatus comprising a diamond-like carbon coating and methods of use

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[0069]Diamond-like coatings were tested in aqueous environments with various hydronium ion concentrations, or PH, with temperatures ranging from room temperature to water boiling. The DLC coatings were applied on the internal surface of a 410 stainless steel (13 Cr-type) cylindrical piece (see FIGS. 9, 10A and 10B). Table 1 lists the visible results of the DLC coating after exposure for 24 hours. DLC coatings were produced using the “Sub-One” process (Sub-One Technology, Pleasanton, Calif.) hollow cathode plasma immersion ion processing (HCPIIP).

TABLE 1DLC Exposure testingConditionsResultsWater PH = 9 24 hrsNo effect on DLCWater PH = 7 24 hrsNo effect on DLCWater PH = 3 24 hrsNo effect on DLCPure HCl (10 min)No effect on DLCWater PH = 0; 10%No effect on DLCNaClHeavilyNo effect on DLCconcentratedNaOH in water

[0070]FIG. 11 shows a drawing of a seal testing device, wherein an internal cylindrical surface is coated with a DLC coating and a piston is moved cyclically from one side to the...

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Abstract

Downhole apparatus and methods of using the apparatus are described, the apparatus comprising at least one metallic component having a DLC coating thereon, the coating present at least on one or more internal passageways of the base metal or alloy to be exposed to downhole environments. Methods of using an apparatus in downhole oilfield operations are also described. This abstract allows a searcher or other reader to quickly ascertain the subject matter of the disclosure. It will not be used to interpret or limit the scope or meaning of the claims.

Description

CROSS REFERENCE TO RELATED APPLICATION[0001]This claims the benefit of the following patent applications: U.S. Ser. No. 11 / 612,088, entitled “INTERSTITIALLY STRENGTHENED HIGH CARBON AND HIGH NITROGEN AUSTENITIC ALLOYS, OILFIELD APPARATUS COMPRISING SAME, AND METHODS OF MAKING AND USING SAME,” filed Dec. 18, 2006.BACKGROUND OF THE INVENTION[0002]1. Field of Invention[0003]The present invention relates generally to the field of coating materials useful for applications where corrosion and wear are important to overcome, as found in oilfield exploration, production, and testing, and more specifically to downhole oilfield apparatus comprising one or more internal surfaces or passageways with a diamond-like coating (DLC) finish.[0004]2. Related Art[0005]Diamond-like coatings are known for various purposes. U.S. Pat. Nos. 7,052,736 and 6,764,714 (Wei, et al.) disclose methods for coating an interior surface of ferromagnetic and non-ferromagnetic tubular structures with such coatings using...

Claims

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Application Information

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IPC IPC(8): E21B43/00
CPCE21B41/02
Inventor BHAVSAR, RASHMIMARYA, MANUEL
Owner SCHLUMBERGER TECH CORP
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