FIELD: stage cementing of wells. SUBSTANCE: device for stage cementing of well has body with side cementing openings. Casing is installed from outside and forms space together with body against side cementing openings. Arranged between body and casing is valve with ball shutoff member. Valve is located in the middle part of space to form upper and lower chambers together with body and casing. Upper chamber is communicated with external space, and lower chamber is communicated with body space. Ball shutoff member is located in lower chamber and made of flexible-deformable material for forcing into upper chamber. Pressure of forcing is determined from expression given in invention description. EFFECT: prevented getting of cement slurry filtrate to producing reservoir. 4 dwg
Title | Year | Author | Number |
---|---|---|---|
WELL COMPLETION METHOD | 1994 |
|
RU2083806C1 |
SHUTOFF FILTER | 1989 |
|
RU2041344C1 |
WELL FILTER | 1994 |
|
RU2085708C1 |
METHOD AT OPENING WORKING SEAM, FREE AT PERFORATING | 0 |
|
SU1765372A1 |
METHOD FOR SECONDARY OPENING OF PRODUCTIVE BED | 1996 |
|
RU2118445C1 |
CUTOFF FILTER | 0 |
|
SU1763640A1 |
METHOD FOR WELL CONSTRUCTION | 1989 |
|
RU2021477C1 |
METHOD FOR SELECTIVE ISOLATION OF PRODUCTIVE RESERVOIR AT CEMENTATION OF PRODUCTION STRING | 1993 |
|
RU2087674C1 |
METHOD FOR PUMPING IN WELL | 1992 |
|
RU2068943C1 |
FILTER-SAFETY VALVE | 0 |
|
SU1102903A1 |
Authors
Dates
1995-02-20—Published
1992-06-30—Filed