Table 1
Force analysis for fluid micro-element in tubing.
| S/N | Name and Symbol | Expression | Orientation |
|---|---|---|---|
| 1 | Total pressure of fluid on Section S1–S1, FS1 | γS(H − z) | Pointing to the direction of the downstream and along the pipeline axis |
| 2 | Total pressure of fluid on Section S2–S2, FS2 |
|
In contrast to FS1 |
| 3 | Component force of weight control along tubing axis Gl |
|
Same as FS1 |
| 4 | Elastic force of casing wall caused by the expanding of cross section Fe |
|
Same as FS1 |
| 5 | Friction of casing wall f | πDdlσ | In contrast to FS1 |