FLOW OUT METHOD OF TREATMENT OF BOTTOMHOLE ZONE OF PRESSURE WELL Russian patent published in 2009 - IPC E21B43/18 E21B41/02 

FIELD: oil and gas production.

SUBSTANCE: invention refers oil and gas industry and can be implemented at cleaning bottomhole zone of pressure well. The essence of the invention is as follows: according to the method solution of surface active substance in fresh water is pumped into annular space of the well in volume of 4-6 m³. When flow string is shut off at the well head, anti-corrosion fluid is being pumped after the solution of surface active substance into annular space of the well during 3-6 minutes up to achieving maximum pressure of pumping, but not above maximum admissible pressure to the production string. Pumping of anti-corrosion fluid is stopped, annular space is shut off at the well head, the flow string is opened at the well head, and flow out is being carried out via the flow string during 3-6 minutes. Further the flow string is shut off at the well head and operations of pumping anti-corrosion fluid and blow out are repeated 3-6 times. When the flow string is shut off at the well head, annular space of the well is completely filled with anti-corrosion fluid, then annular space at the well head is shut off, the flow string is opened and flow out is performed via the flow string till clean water appears; the well is started-up.

EFFECT: increased efficiency of cleaning of bottomhole zone of pressure well.

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