METHOD OF SEALING RECOVERY OF PRODUCTION STRING

摘要

FIELD: oil and gas production. ^ SUBSTANCE: sand bridging is installed before injection in the well below the defect of production string and cement bridging 5-10 m is installed above the perforation interval. The oil is injected through tubing on the basis 2 m per 1 m of the strata net thickness and water is forced out of the insulation zone. After that the solution of Mikrodur R-U with sulfatsell is pumped in with water-cement ratio 0.8-0.9 on the basis of 0.5-2.0 m per 1 m of the strata net thickness with the following component ratio, wt %: Mikrodur R-U 51.4-54.9; sulfatsell 2.3-1.1; water 46.3-44.0. ^ EFFECT: increase of insulation reliability in case of sealing failure of production string, reduction of insulating works period. ^ 1 tbl