| 单词 | swivel head |
| 释义 | swivel head in the Oil and Gas Industry (swɪvəl hɛd) Word forms: (regular plural) swivel heads noun (Extractive engineering: Field development, Drilling) A swivel head is a bearing between the traveling block and the kelly. The kelly is suspended from the swivel head which has two parts, the lower part rotating with the kelly. The kelly is lifted to its highest position, the swivel head rotated into the direction of drilling, and the bit lowered until it touches theground. A swivel head is a bearing between the traveling block and the kelly. |
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