Elastomer-thermally conductive carbon fiber compositions for roller-cone drill bit seals

Patent metadata

Field	Value
Publication number	US-2016201397-A1
Application number	US-201414912826-A
Country	US
Kind code	A1
Filing date	Sep 19, 2014
Priority date	Sep 20, 2013
Publication date	Jul 14, 2016
Grant date	—

Abstract

The present disclosure relates to elastomer-thermally conductive carbon fiber compositions for use in seals for roller-cone drill bits. The present disclosure further relates to seals formed from such compositions and to roller-cone drill bits containing such seals.

First claim

1 . A seal for a roller-cone drill bit comprising an elastomer-thermally conductive carbon fiber composition comprising:
an elastomer; and at least 5 php graphitized thermally conductive carbon fibers having a longitudinal thermal conductivity of at least 350 W/mK, wherein the elastomer-thermally conductive carbon fiber composition has a thermal conductivity of at least 0.5 W/mK.

2 . The seal according to claim 1 , wherein the thermally conductive carbon fiber comprise at least two types of carbon fibers.

3 . The seal according to claim 1 , wherein the lengths of the thermally conductive carbon fibers are multimodal.

4 . A roller-cone drill bit comprising:
a bit body having at least one support arm extending therefrom; a respective cone assembly rotatably mounted on a spindle extending from each support arm; a seal disposed in at least one support arm, wherein the seal comprises an elastomer-thermally conductive carbon fiber composition comprising:
an elastomer; and
at least 5 php carbon fibers having a longitudinal thermal conductivity of at least 350 W/mK,
wherein the elastomer-thermally conductive carbon fiber composition has a thermal conductivity of at least 0.5 W/mK.

5 . The bit according to claim 3 , wherein the carbon fibers comprise at least two types of carbon fibers.

6 . The seal according to claim 2 , wherein the lengths of both types of the thermally conductive carbon fibers are multimodal.

7 . The bit according to claim 4 , wherein the lengths of the thermally conductive carbon fibers are multimodal.

8 . The bit according to claim 5 , wherein the lengths of both types of the thermally conductive carbon fibers are multimodal.

9 . The seal according to claim 1 , wherein the elastomer comprises hydrogenated nitrile rubber (HNBR), acrylonitrile butadiene styrene (ABS) rubber, ethylene-propylene-diene monomer (EPDM) rubber, ethylene vinyl acetate (EVA) rubber, partially fluorinated rubber, nitrile rubber (NBR), styrene-butadiene rubbers (SBR), natural polyisoprene (NP), polybutadiene (BR), chloroprene rubber (CR), butyl rubber, ethylene polypylene rubber (EPM), epichlorohydrin (ECO), polyacrylic rubber (ACM), silicone rubber (SI), fuorosilicone rubber (FVMQ), fluoroelastomers (FKM), or any combinations thereof.

10 . The bit according to claim 4 , wherein the elastomer comprises hydrogenated nitrile rubber (HNBR), acrylonitrile butadiene styrene (ABS) rubber, ethylene-propylene-diene monomer (EPDM) rubber, ethylene vinyl acetate (EVA) rubber, partially fluorinated rubber, nitrile rubber (NBR), styrene-butadiene rubbers (SBR), natural polyisoprene (NP), polybutadiene (BR), chloroprene rubber (CR), butyl rubber, ethylene polypylene rubber (EPM), epichlorohydrin (ECO), polyacrylic rubber (ACM), silicone rubber (SI), fuorosilicone rubber (FVMQ), fluoroelastomers (FKM), or any combinations thereof.

11 . The seal according to claim 1 , wherein the carbon fibers comprise non-metallic thermally conductive carbon fibers.

12 . The seal according to claim 2 , wherein both types of the carbon fibers comprises non-metallic thermally conductive carbon fibers.

13 . The bit according to claim 4 , wherein the carbon fibers comprise non-metallic thermally conductive carbon fibers.

14 . The bit according to claim 5 , wherein both types of the carbon fibers comprises non-metallic thermally conductive carbon fibers.

15 . The seal according to claim 1 , wherein the carbon fibers are less than 20 microns in diameter.

16 . The seal according to claim 2 , wherein both types of the carbon fibers are less than 20 microns in diameter.

17 . The bit according to claim 4 , wherein the carbon fibers are less than 20 microns in diameter.

18 . The bit according to claim 5 , wherein both types of the carbon fibers are less than 20 microns in diameter.

19 . The seal according to claim 2 , wherein at least one type of the carbon fibers are less than 1 micron in diameter.

20 . The bit according to claim 5 , wherein at least one type of the carbon fibers are less than 1 micron in diameter.

Assignees

• Halliburton Energy Services Inc

Inventors

• Reddy B Raghava
• Liang Feng
• Sui Ping C
• Duckworth David P

Classifications

• F16J15/3284

  characterised by their structure; Selection of materials · CPC title

• F16J15/102

  characterised by material · CPC title

• E21B10/25 Primary

  characterised by sealing details · CPC title

• E21B2010/225

  Fixed Constructions · mapped topic