-Prevents oil from entering the annulus-Tunable transition temperatures of the shape memory alloys to match well conditions-Invention and operational procedures work well with a safe level of hysteresis
[更多]
| |< <- | [6466] [6467] [6468] [6469] [6470] [6471] [6472] [6473] [6474] [6475] [6476] | -> >| |
