| Discussion on Life Prediction Method of Product with Nitrile Rubber Bushing |
| Received:October 20, 2020 Revised:October 20, 2020 |
| DOI：10.12136/j.issn.1000-890X.2022.07.0527 |
| Key Words: NBR；bushing；stator and rotor；engine；screw drill；matching size；life |
| Author Name | Affiliation | E-mail | | SONG Jiang* | Beijing Petroleum Machinery Co.，Ltd | kongkongmum@126.com | | LUO Xichao | Beijing Petroleum Machinery Co.，Ltd | | | LIU Xinxin | Beijing Petroleum Machinery Co.，Ltd | | | GUO Tianming | Beijing Petroleum Machinery Co.，Ltd | | | SUN Xiaoliang | Beijing Petroleum Machinery Co.，Ltd | | | ZHANG Yifan | Beijing Petroleum Machinery Co.，Ltd | |
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| Abstract: |
| Taking the engine stator of a conventional screw drill for oil field drilling as an example，combined with the physical property test of nitrile rubber（NBR） compound，a model of the change of the matching size of the NBR bushing of the stator under the effect of time was innitially established，and the life prediction method of engine under the design matching sizes of the stator and rotor was discussed.The results showed that the matching size of the engine stator and rotor before leaving the factor directly affected its life.The main factors influencing the matching size of the NBR bushing of the engine stator were physical force，temperature rise，medium，pressure change and wear. By measuring the physical properties of NBR compound and combined with the actual drilling data in the oilfield，the life of the engine under the design matching sizes of stator and rotor could be predicted. |
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