News Column

Researchers Submit Patent Application, "Heat Resistant Seal Member", for Approval

June 26, 2014



By a News Reporter-Staff News Editor at Politics & Government Week -- From Washington, D.C., VerticalNews journalists report that a patent application by the inventors Ueki, Hiroyuki (Uedad-shi, JP); Noguchi, Toru (Matsumoto-shi, JP); Ito, Masaei (Sagamihara-shi, JP), filed on December 2, 2013, was made available online on June 12, 2014.

The patent's assignee is Shinshu University.

News editors obtained the following quote from the background information supplied by the inventors: "(1) Field

"One or more embodiments of the present disclosure relates to a heat resistant seal member having high heat resistance and having hydrogen sulfide resistance.

"(2) Description of Related Art

"A heat resistant seal member in which one type of vapor-grown carbon fibers having a mean diameter exceeding 30 nm but not exceeding 200 nm and carbon black having a mean particle size between 25 nm and 500 nm are combined with a ternary fluoroelastomer has been developed (for example, International Publication WO2009/125503 which is referred to Patent Document 1). Introducing such heat resistant seal member having heat resistance as a static seal member for down-hole device in order to, for example, search for underground resources such as oil, natural gas, and the like, allowed for successful deeper drilling.

"Further, a dynamic seal member has been developed in which either of carbon nanofibers having a mean diameter of between 10 nm and 20 nm or carbon nanofibers that have been subjected to a low-temperature heat treatment having a mean diameter between 60 nm and 110 nm is combined with a ternary fluoroelastomer (for example, International Publication WO2011/077595 which is referred to Patent Document 2). Such dynamic seal member has high mechanical properties and wear resistance in a high temperature at 200.degree. C. or higher, and therefore, for example, could be adopted as the dynamic seal member for an oilfield use application.

"However, in connection with the development of these heat resistant seal members, the drilling depth was able to be further deepened, and therefore, development of a heat resistant seal member that can withstand even harsher environments has been demanded. Such harsher environments include, for example, high concentration hydrogen sulfide gas at a high temperature that is generated in an oilfield and the surrounding area.

"Further, carbon fiber composite with an excellent heat resistance using fluorine-containing elastomers and carbon nanofibers has been proposed in the past (for example, Japanese laid-open Patent Application Publication 2009-161652 which is referred to Patent Document 3); however, the materials proposed in the past had shown difficulty in withstanding a harsh environment, particularly use in a high concentration hydrogen sulfide gas at a high temperature for a long period of time."

As a supplement to the background information on this patent application, VerticalNews correspondents also obtained the inventors' summary information for this patent application: "One aspect of the present disclosure is to provide a heat resistant seal member having high heat resistance and hydrogen sulfide resistance.

"A heat resistant seal member according to one embodiment of the present disclosure contains approximately 100 parts by weight of a ternary fluoroelastomer, 5 to 15 parts by weight of first carbon nanofibers having a mean diameter of not less than 60 nm and not more than 200 nm, 10 to 15 parts by weight of second carbon nanofibers having a mean diameter of not less than 9 nm and not more than 20 nm and 0 to 20 parts by weight of carbon black having a mean particle size between 25 nm and 500 nm. The first carbon nanofibers and the second carbon nanofibers are both contained therein, and the total amount of the first carbon nanofibers and the second carbon nanofibers is 15 to 30 parts by weight, and the total amount of the first carbon nanofibers, the second nanofibers, and the carbon black is 20 to 45 parts by weight.

"According to the heat resistant seal member of one embodiment of the present disclosure, by combining a predetermined amount of the first carbon nanofibers and the second carbon nanofibers that have two different thicknesses, and dispersing them into the ternary fluoroelastomer uniformly, high heat resistance and excellent hydrogen sulfide resistance can be obtained.

"A heat resistant seal member according to one embodiment of the present disclosure contains an elastomer, the first carbon nanofibers and the second carbon nanofibers that are dispersed in the elastomer, the first carbon nanofibers form a plurality of first cell structures, and the second carbon nanofibers form a plurality of second cell structures while surrounding the plurality of the first cell structures.

BRIEF DESCRIPTION OF THE DRAWINGS

"FIG. 1 is a drawing schematically illustrating a mixing and kneading method of a fluorine-containing elastomer, first carbon nanofibers, and second carbon nanofibers by an open roll method used in one embodiment of the present disclosure.

"FIG. 2 is a schematic diagram describing a usage condition of a down-hole device.

"FIG. 3 is a schematic diagram illustrating one section of the down-hole device.

"FIG. 4 is a vertical cross-sectional view illustrating a coupled section of a pressure vessel of the down-hole device.

"FIG. 5 is a vertical cross-sectional view illustrating other single-use form of an O-ring for the down-hole device.

"FIG. 6 is a vertical cross-sectional view illustrating other single-use form of the O-ring for the down-hole device.

"FIG. 7 is a cross-sectional view schematically illustrating a logging tool for subsea use.

"FIG. 8 is a partial cross-sectional view schematically illustrating the logging tool of FIG. 7.

"FIG. 9 is a X-X' cross-sectional view schematically illustrating a mud motor of the logging tool in FIG. 8.

"FIG. 10 is a cross-sectional view schematically illustrating a logging tool for underground use.

"FIG. 11 is a vertical cross-sectional view schematically illustrating a testing device for a wear resistance test.

"FIG. 12 is schematic view describing a structure of the heat resistant seal member according to one embodiment."

For additional information on this patent application, see: Ueki, Hiroyuki; Noguchi, Toru; Ito, Masaei. Heat Resistant Seal Member. Filed December 2, 2013 and posted June 12, 2014. Patent URL: http://appft.uspto.gov/netacgi/nph-Parser?Sect1=PTO2&Sect2=HITOFF&u=%2Fnetahtml%2FPTO%2Fsearch-adv.html&r=3018&p=61&f=G&l=50&d=PG01&S1=20140605.PD.&OS=PD/20140605&RS=PD/20140605

Keywords for this news article include: Gases, Elements, Chemistry, Nanofiber, Nanotechnology, Hydrogen Sulfide, Sulfur Compounds, Shinshu University, Inorganic Chemicals, Noncarboxylic Acids, Emerging Technologies.

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Source: Politics & Government Week


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