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RISS 인기검색어
- 검색키워드
- 저자 : Chuanjun Han (검색결과 4 건)
- 무료
- 기관 내 무료
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Mechanical behavior and sealing performance of HAR sealing system in roller cone bits
Yang Hu,Chuanjun Han,Jie Zhang,Zixuan Luo,Ruichuan Wang,Te Hu 대한기계학회 2021 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.35 No.10
Two numerical models of HAR ring and O-ring sealing systems for roller cone bits were established in this paper. The stress-strain distribution was analyzed by finite element method. Effects of compression ratio, fluid pressure, ambient temperature and friction coefficient on mechanical behavior and sealing performance were studied. The results show that the HAR ring has better sealing performance than O-ring in the same working condition. The HAR ring can realize multi-stage sealing to increase the reliability of sealing. The high stress region appears at the sharp corner below the shaft. The sealing performance and the von Mises stress is enhanced with compression ratio and fluid pressure increasing. Under a high working temperature field, the sealing surface of HAR ring fails easily. The contact pressure fluctuation of the sealing surface easily appears by friction coefficient. Sharp-angled regions of the HAR ring near S.S.3, S.S.5 and S.S.6 fail easily.
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Analysis of running depth and study of combined tubing of drill-grinding string in horizontal wells
Wenkang Chen,Chuanjun Han,Liangliang Ding 대한기계학회 2021 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.35 No.12
To solve the difficulty of running drill-grinding string in oilfields, the joining pattern of two-line weight tubing combination is used to increase the running depth of drill-grinding string. There are currently few theoretical bases and systematic researches on the combined tubing. Thus, a calculation model of the combined tubing was established. Meanwhile, an experimental study of running drill-grinding string was conducted. The accuracy of the calculation model was discussed based on the experimental results. The field application of the calculation model was discussed. Finally, the combined characteristics and sensitivity analysis were studied. The results indicate that the critical condition for the optimal combination proportion of twoline weight tubing is a well depth of 1.236 rad deviated angle. The parameters affect running drill-grinding string, including frictional coefficient, running velocity, liquid density, and inner diameter. The work presented provides an effective solution and theoretical evidence for solving this difficulty.
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Cheng Yu,Chuanjun Han,Lin Wang,Jiaqiang Jing,Yuxing Li,Wuchang Wang,Mingjun Du,Xincan Song 대한기계학회 2023 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.37 No.10
Both micron-sized sand particles flowing into the pipe and the secondary formation of natural gas hydrate will pose a great threat to the flow assurance of the pipeline for hydrate exploitation. Therefore, based on the population balance model considering the aggregation and breakage of hydrate and micron-sized sand particles, the flow characteristics coupling hydrate and micron-sized sand are studied, and the effects of flow velocity are discussed. The results show that the slurry viscosity increases significantly at the lower part of the horizontal pipe where the solid particles tend to aggregate. After the slurry enters the elbow pipe, the viscosity, hydrate concentration, and particle size gradually decrease, while the sand concentration first increases and then decreases. Solid particles with relatively high concentration and large particle size appear on the outside of the first half of the elbow. In the vertical pipe, the hydrate concentration and particle size gradually increase again, and the hydrate with high concentration and large particle size appears on the inside. Besides, the coupling aggregation of hydrate and sand particles is concentrated near the wall of the bottom of the horizontal pipe, near the wall of the outside of the elbow pipe and the inside of the second half of the elbow, and near the wall of the vertical pipe. The high flow velocity has a great ability to carry the hydrate with high concentration and large size.
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Cheng Yu,Lin Wang,Chuanjun Han,Jiaqiang Jing,Yuxing Li,Wuchang Wang,Mingjun Du,Xincan Song,Longyao Zhang 대한기계학회 2022 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.36 No.7
The hydrate particle aggregation is crucial for the flow safety of oil and gas pipelines. In this paper, coupled with the Eulerian-Eulerian model, k-ε turbulence model and the population balance model considering the hydrate aggregation and breakage, the hydrate aggregation process is studied in the bend, and the change of the average particle size under different hydrate volume fractions is discussed. The results show that the hydrate aggregation process includes two stages in the bend, namely the rapid growth and the dynamic equilibrium. In the rapid growth stage, both the hydrate concentration and particle size in the elbow increase rapidly, and the high concentration and large particle size regions on the inside of the elbow also increase significantly. Furthermore, two types of aggregates are formed on the inside of the elbow. One is a small amount of large-particle aggregates, while the other is the relatively high concentration of medium-size aggregates. Besides, the uniform suspension with a smaller concentration and particle size is distributed on the outside of the elbow, but there are also large-size particles that aggregate and adhere near the wall of pipe. As the hydrate volume fraction increases, the hydrate average particle size increases. High concentration hydrate reaches dynamic equilibrium faster during the flow process.
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