FIELD: mining.
SUBSTANCE: invention is intended for perforation of well casing strings at development of productive formations. Cased well perforation system includes tubing string connected with pipe circuit with pump unit, housing, downhole equipment on suspension, including flexible shaft drive, flexible shaft with tool. Flexible shaft with tool is arranged in clamping device. In coupling connecting tubing and housing and located above suspended downhole equipment, at least one safety valve is arranged, containing channel for fluid output from inner space of tubing string to annular space, and shutoff element shutting off channel. Shutoff element is spring-loaded with force exceeding working pressure of liquid in tubing string.
EFFECT: higher reliability of the perforation system.
1 cl, 3 dwg
| Title | Year | Author | Number |
|---|---|---|---|
| FLEXIBLE SHAFT | 2019 |
|
RU2703023C1 |
| HYDRAULIC MECHANICAL BOREHOLE PERFORATOR | 2021 |
|
RU2776541C1 |
| CASED WELL PERFORATION SYSTEM | 2018 |
|
RU2689454C1 |
| METHOD FOR CREATING CASED PERFORATION CHANNEL IN PRODUCTIVE FORMATION OF OIL OR GAS CASED WELL | 2020 |
|
RU2746398C1 |
| METHOD FOR SECONDARY DRILLING OF PRODUCTIVE FORMATION WITH CREATION OF SYSTEM FROM EXTENDED DRAIN CHANNELS AND DEVICE FOR ITS IMPLEMENTATION | 2010 |
|
RU2457318C2 |
| DEVICE FOR MAKING OF DEEP FILTRATION CHANNEL | 2012 |
|
RU2498051C2 |
| SYSTEM FOR CASED WELL WALL PERFORATION | 2006 |
|
RU2321728C1 |
| SET OF ASSEMBLIES FOR INCREASING THE FILTRATION AREA OF THE BOTTOMHOLE ZONE OF AN OPEN HORIZONTAL WELL | 2021 |
|
RU2771371C1 |
| METHOD OF DRILLING AND DEVELOPMENT OF OFFSHOOTS FROM HORIZONTAL WELL | 2019 |
|
RU2709263C1 |
| METHOD OF THE CASED WELL PROBE PERFORATION | 2015 |
|
RU2668620C2 |
