FIELD: mining, particularly well forming tools adapted to construct wells for water or other fluid medium production, to complete well during well drilling and to repair well to prevent sand withdrawal from loose productive beds.
SUBSTANCE: filtering well construction tool comprises main and additional screens, sump with check valve, flushing pipe detachably connected thereto and provided with shutoff means and with circular check valve. The flushing pipe is slidably installed in main and additional screens. Check valve has radial flushing channels and is installed in blocked sump area having radial flushing channels. The check valve is provided with hollow pusher having radial flushing orifices in lower part thereof. Pusher top is used as check valve shutoff means.
EFFECT: optimal gravel distribution over the full filtering zone and increased reliability of drill cuttings and formation sand removal, as well as increased efficiency of natural screen forming.
3 cl, 1 dwg
| Title | Year | Author | Number |
|---|---|---|---|
| METHOD AND TOOL FOR FILTERING WELL CONSTRUCTION | 2003 |
|
RU2250309C1 |
| TOOL FOR CONSTRUCTION OF FILTERED WELL | 2001 |
|
RU2209943C1 |
| FILTERING WELL CONSTRUCTION METHOD | 2006 |
|
RU2309243C1 |
| FILTERING WELL CONSTRUCTION METHOD | 2006 |
|
RU2309244C1 |
| METHOD AND TOOL FOR CONSTRUCTION OF FILTERING WELL | 2003 |
|
RU2250358C1 |
| FILTERING WELL CONSTRUCTION TOOL | 2006 |
|
RU2306409C1 |
| METHOD AND APPARATUS FOR FILTER WELL FORMING | 2003 |
|
RU2252303C1 |
| FILTERING WELL CONSTRUCTION METHOD | 2004 |
|
RU2280149C1 |
| FILTERING WELL CONSTRUCTION METHOD | 2004 |
|
RU2280760C1 |
| METHOD FOR BUILDING A FILTERING WELL | 2005 |
|
RU2289017C1 |
