| LIU Jing-chao,LIU Chao,WANG Xiao.Influence of Sand in Fracturing String on Sleeve Tee[J],45(5):118-122 |
| Influence of Sand in Fracturing String on Sleeve Tee |
| Received:January 23, 2016 Revised:May 20, 2016 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2016.05.018 |
| KeyWord:sand sleeve tee LS-DYNA coating surface stress damage |
| Author | Institution |
| LIU Jing-chao |
Engineering Technology Company, CNOOC Energy Technology & Services Limited, Tianjin , China |
| LIU Chao |
Engineering Technology Company, CNOOC Energy Technology & Services Limited, Tianjin , China |
| WANG Xiao |
Engineering Technology Company, CNOOC Energy Technology & Services Limited, Tianjin , China |
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| Abstract: |
| Objective To prevent damage of sleeve tee caused by sand. Methods Using the finite element software LS-DYNA, the impact of sand on sleeve tee was modeled. By changing the coefficient of friction between the ball seat surface and sand, the thickness of the coating, the diameter of sand, the speed of sand, the angle between sand velocity and sleeve tee surface, the effects of parameter changes on sleeve tee surface stress were observed by simulation results. Results With the static coefficient of friction between the sand and the ball seat increasing from 0.1 to 0.4, the maximum surface stress on ball seat increased from 1.67 GPa to 2.33 GPa. With the coating thickness on the ball seat surface increasing from 3 μm to 6 μm, the maximum surface stress ball seat decreased from 2.05 GPa to 0.89 GPa. As the diameter of sand increased from 50 μm to 80 μm, the largest surface stress on the ball seat increased from 1.67 GPa to 3.63 GPa. With the sand speed increasing from 24 m/s to 96 m/s, the maximum surface stress on ball seat increased from 0.96 GPa to 2.42 GPa. With the angle between the sand speed and ball seat surface increasing from 15° to 60° , the maximum surface stress on ball seat increased from 1.67 GPa to 4.12 GPa. Conclusion Performance of fracturing fluid affected the coefficient of friction between the sand and the ball seat, thereby affecting the tee surface stress magnitude; appropriately increasing the surface coating thickness of tee could reduce its maximum stress. The larger the diameter of sand, the greater the stress on the ball seat. The sleeve could be designed to make the angle between the surface and the center line of the ball seat as small as possible to reduce the maximum surface stress on ball seat. Increased construction could exacerbates the destruction of tee. |
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