| 摘要 |
FIELD: oil and gas production. ^ SUBSTANCE: system of control over actuating mechanism of downhole device consists of case of device with channel and at least one connection with control line, of at least one piston with first part communicating with said connection with control line, second part balanced by pressure and preventing effect to said channel, and third part forming at least partially chamber of alternate volume isolated from said channel. If the main system fails, then the reserve system is actuated. ^ EFFECT: simplicity, reliability and low cost of fabrication. ^ 22 cl, 1 dwg |
