FIELD: mining.
SUBSTANCE: valve consists of a housing with an axial channel, a seat, a spring-loaded shut-off element connected to a rod, a sleeve connected to the housing. The sleeve is provided with a number of longitudinal guides on the inside surface, it is connected to the housing through the upper and lower limiters forming an annular chamber filled with cement. Wherein the seat is in the upper limiter. A rod with a spring-loaded sole and an additional sleeve tightened to the lower limiter is passed through the lower limiter provided with perforations. The shut-off element is made of a flexible material, and the additional sleeve is made of a material soluble under in-situ conditions, for example a solid drilling mud surfactant.
EFFECT: improving valve operating reliability.
2 dwg
| Title | Year | Author | Number |
|---|---|---|---|
| RETURN VALVE FOR CASING STRINGS | 2016 |
|
RU2612771C1 |
| COMPLETION OF DIRECT-CEMENTING CASING STRING WITH RETURN VALVE | 2014 |
|
RU2571469C1 |
| SHUT-OFF VALVE FOR CASING STRING | 2021 |
|
RU2760447C1 |
| CASING STRING BOTTOM EQUIPMENT | 2019 |
|
RU2726783C1 |
| DEVICE FOR REGULATED DELIVERY OF DRILLING MUD OR CEMENT SLURRY | 1998 |
|
RU2137907C1 |
| CASING STRING VALVE | 2020 |
|
RU2748080C1 |
| VALVE FOR CASING STRINGS | 0 |
|
SU1094948A1 |
| CASING STRINGS VALVE | 2003 |
|
RU2250355C1 |
| DEVICE FOR CONBINED CEMENTING OF CASING | 0 |
|
SU1756539A1 |
| SLEEVE FOR STAGE-WISE CEMENTING OF CASINGS | 0 |
|
SU929816A1 |
