REPAIR METHOD OF PRODUCTION CASING OF PRODUCING WELL Russian patent published in 2020 - IPC E21B33/10 

FIELD: mining.

SUBSTANCE: invention relates to a method of repairing production string of production well. Method of repairing production string of producer includes detection of interval of failure of production string, lowering into the production string of a flow column with a plug support an insert sucker rod pump (SRP), equipped upward with a plug, a perforated pipe and a packer, landing of the packer in the production string below the interval of its violation, lowering into pipes tubing string SRP plunger on rod string, landing plunger SRP in lock support and starting SRP in operation. After detection of failure interval, specific intake of disturbance of production string is determined. If the specific pickup disorders g<0.5 m³/(chMPa), then produce a preliminary drainage disorders acid in volume of 1.5 m³ to achieve specific injectivity g>0.5 m³/(chMPa), then produce plugging violations production string. After plugging fluid inflow from disturbance is determined by level reduction in production string. If inflow of liquid from disturbance of the production string is absent, then it is equipped with pump equipment and the production well is put into operation. If liquid inflow from disturbance of the production string is not more than 10 % of the flow rate and this makes it possible to economically exploit the production well, at the mouth of the production well the following layout is assembled from the bottom up: a plug, a perforated branch pipe, a packer, a flow column with lock support of inserted SRP, lowering the assembly into a production string. If the packer is sealed, the inserted SRP is lowered into the flow string and put into the column support of the flow column. If inflow of liquid from disturbance of production string is more than 10 % and exceeds value of profitable operation of production well, then tamponing is repeated to reduction of inflow of liquid from disturbance of not more than 10 % and achievement of profitable operation of production well.

EFFECT: technical result is higher reliability of production string repair of production well.

1 cl, 4 dwg