METHOD OF TREATMENT OF BOTTOMHOLE ZONE OF PRESSURE WELL WITH FLOW OUT Russian patent published in 2009 - IPC E21B43/18 E21B43/22 

FIELD: oil and gas production.

SUBSTANCE: here is disclosed method of cleaning bottomhole zone of pressure well with flow out. The invention refers to oil industry and can be implemented at cleaning bottomhole zone of a pressure well. The essence of the invention is as follows: according to the method the well is filled with circulating fluid, density of which is not less, than density of local water, for 0.1 g/cm³. 4-6 m³ of 0.1-0.3 % solution of surface active substance ML-81B in fresh water is supplied into the flow string to the bottomhole of the well. Pumping of fluid into bottomhole zone is carried out via the flow string, till pressure builds up at value not exceeding admissible value in cased column of well; rate of pumping is 5-10 m³/hour. During pouring auf the liquid outlay is restrictioned not more than 4 m³/hour.

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

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