METHOD FOR REAGENT INJECTION IN WELL Russian patent published in 2007 - IPC E21B37/06 E21B41/02 

FIELD: oil and gas production, particularly for metered corrosion inhibitor, paraffin and salt accumulation inhibitor, as well as demulsifying agent injection in oil well.

SUBSTANCE: method involves performing periodic regent supply in hole annuity of well with the use of proportioning pump. In the case of underground repair of sticky well supply cable of centrifugal pump electric motor is substituted for cable with capillary pipe. The cable with capillary pipe is connected to flow string and is lowered in well. Chemical reagent is injected in well via the capillary pipe to downhole pump inlet or within perforation interval of the well. To provide chemical reagent supply capillary pipe end is connected with polyethylene capillary pipe having design length with the use of connection nipple provided with weighting jet.

EFFECT: provision of guaranteed reagent supply to pump inlet or within well perforation interval, possibility to change class of reagent to be supplied in well and amount of reagent in dependence of well operation parameters.

1 dwg