FIELD: oil and gas production. SUBSTANCE: invention can be used for fixing casing strings in oil and gas wells. Lower dividing plug is run into borehole and cement mortar is pumped in. Then upper dividing plug is run down and space above it is filled with forcing fluid. Cement mortar is forced through membrane of lower plug. When the two plugs are joined, their position is fixed by anchor mounted on upper plug. After anchor is opened, pressure on forcing fluid is reduced. Mortar during its hardening period is affected by vibrator. EFFECT: reduced probability of microfissures and reduced cementation quality. 4 dwg
| Title | Year | Author | Number |
|---|---|---|---|
| DEVICE FOR REPAIR OF OIL AND GAS WELLS | 1997 |
|
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| APPARATUS FOR DOUBLE-STAGE CEMENTING OF CASINGS | 0 |
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SU1289982A1 |
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RU2576253C1 |
