Український науково-дослідний інститут природних газів
Украинский научно-исследовательский институт природных газов
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Method for well cementation includes lowering of lower section of casing string into it on drill string, injection to annular space of flushing fluid and cement mortar, and to pipe space – spacer fluid. To increase quality of cementation due to prevention of absorption of cement mortar and drilling fluid under conditions of abnormally low stratal pressures one lowers into drill and casing strings additional string, seals annular space of casing and additional strings in upper and lower parts of those and drill string – in the upper part. Injection of flushing fluid, cement mortar and spacer fluid is performed through additional string. Simultaneously with injection of those fluids through annular space between the drill and the additional strings one injects light-weight fluid to annular space.
UA4413678A1988-04-191988-04-19Method for well cementation
UA14199A1
(en)
Method for preventing gas migration along behind-column space of oil and gas wells, as well as following intercolumn gas manifestations and gas springs on their mouths