METHOD OF ELIMINATION OF LEAKAGE OF PRODUCING WELL COLUMN Russian patent published in 2008 - IPC E21B33/13 

FIELD: oil and gas industry.

SUBSTANCE: invention refers to oil industry and can be employed at elimination of leakage of producing well column. The essence of the invention is as follows: according to the method insulation for preventing inflow of liquid of lower part of a well is installed 3-5 m lower of leakage interval. Then capacity of leakage interval is determined. When capacity of leakage interval exceeds 300 m³/day and pressure at the wellhead exceeds 10 MPa, stabilising water-oil emulsion is pumped as insulation material; when capacity of leakage interval exceeds from 150 to 300 m³/day and pressure at the wellhead exceeds 10 MPa, a polymer-cement solution "Monolit-P" is pumped as an insulating material; and if capacity is less, than 150 m³/day and pressure at the wellhead less, than 10 MPa, material "Granite" is pumped as an insulating material. At that pumped insulating material is brought in the flow column to the leakage interval , then partially it is pressed into the well till levels of insulating material in the flow column and annulus space equalise, then the flow column is lifted and insulating material is pressed into the leakage interval.

EFFECT: facilitating elimination of lower annulus circulation of well.

2 cl, 1 ex