METHOD FOR KILLING WELL WITH FIBERGLASS CASING Russian patent published in 2024 - IPC E21B33/14 C09K8/40 

FIELD: well killing.

SUBSTANCE: method for killing a well with a fiberglass casing. The method includes running a fiberglass casing into a well. It also includes pumping buffer fluid and cement slurry into a fiberglass casing and squeezing it with a displacing fluid. Preliminary geophysical survey is carried out. Based on the research results, the number and intervals of occurrence of aquifers and productive formations are identified. Cuff devices are installed on the fiberglass casing. After running the fiberglass casing and pumping the buffer fluid into the fiberglass casing, a viscoelastic composition with a density of no more than 1.2 g/cm³ is pumped, then a cement slurry with a density of no more than 1.45 g/cm³. Then a viscoelastic composition with a density of no more than 1.2 g/cm³ in an amount sufficient to cover the annular space in the interval below the aquifer from its base to the roof of the next layer. If there are several aquifers, the operations of pumping cement slurry with a density of no more than 1.45 g/cm³ and a viscoelastic composition with a density of no more than 1.2 g/cm³ are repeated. After this, a cement slurry with a density of no more than 1.45 g/cm³ is pumped in an amount that ensures the covering of the productive formation from the bottom to the roof. Next, the compositions are pressed with a displacing fluid. After which the well is left while waiting for the cement slurry to harden.

EFFECT: increasing the efficiency of the method for killing wells with fiberglass casing and simplifying the process of well killing.

1 cl, 2 dwg