| 摘要 |
FIELD: oil producing industry; oil well testing and completing plants. ^ SUBSTANCE: housing of jet pump accommodates working medium flow selector in form of movable spring-loaded support bushing with thrust flange forming channel together with housing communicating with annulus. Bypass holes and seating place for mounting sealing unit are made in support bushing. With support bushing in upper position, output of media mixture removing channel and pumped out medium supply channel are closed by support bushing and with support bushing in lower position, its upper end face is located lower than output of media mixture removing channel to communicate bypass holes of support bushing with pumped out medium supply channel. Sealing unit is made in form of stepped housing with sealing member and stepped piston spring-loaded relative to sealing member. Holes closed by piston in its lower position are made in walls of housing of sealing unit opposite to upper bypass holes of support bushing. With piston in upper position and with support bushing in lower position pumped out medium supply channel communicates with inner space of tubing string higher than check valve and lower than housing of jet pump, and lower bypass holes of support bushing communicate with pumped out medium supply channel. Channels for logging cable are made in piston and sealing member. With support bushing in upper position, channel to remove media mixture and supply pumped out medium are closed by support bushing. With support bushing in lower position, upper end of support bushing is located lower, than output hole of media mixture removing channel. ^ EFFECT: improved reliability and increased capacity of plant. ^ 3 dwg |
