FIELD: well drilling. SUBSTANCE: device for shutting-off lost circulation zone has body accommodating perforated branch pipe which forms annular space together with body housing flexible shell. Besides, device has adapter, piston member, its retainer and value unit. Body is made in form of core barrel which has crown bit connected to it by means of adapter. Adapter has conical flow area. Piston member is made in form of branch pipe fitted on perforated branch pipe and fixed by means of ball lock. Valve unit is made in form of seat and shutoff member. Seat is made on upper end of perforated branch pipe. Shutoff member has rope whose length is less than core barrel by 0.4-0.5 m. Rope is connected with adapter. EFFECT: higher reliability of device, provision of control of device operation and extended field of application. 1 dwg
| Title | Year | Author | Number |
|---|---|---|---|
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|
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|
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|
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| PLUGGING TOOL | 0 |
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| CORE BARREL | 0 |
|
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| DEVICE FOR ELIMINATION OF ABSORPTIONS OF WASHING LIQUIDS IN WELLS | 2009 |
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RU2400616C1 |
