PROCEDURE FOR TREATMENT OF BOTTOMHOLE ZONE OF PRODUCER WITH TWO WELLHEADS Russian patent published in 2013 - IPC E21B43/27 E21B37/06 

FIELD: oil and gas industry.

SUBSTANCE: in procedure for treatment of bottomhole zone with two wellheads in case of failure of an electric-centrifugal pump (ECP) with no apparent deviation in its operating parameters and in case of alkalinity growth for extracted product up to pH>7 the required volume of hydrogen chloride solution is calculated on the basis of a length and diameter of the well filtering part; the required volume of hydrogen chloride solution is selected to treat the whole volume of the strainer; the required volume of flush fluid is calculated for delivery of compounds into a slope wellhead. ECP is shutdown at the vertical wellhead before pumping of hydrogen chloride solution is started. The required volume of hydrogen chloride solution is carried out into tubular annulus from the side of the vertical wellhead. When pumping of hydrogen chloride solution is over extraction from the slope wellhead is increased and ECP is started from the vertical wellhead. ECP is stopped at the vertical wellhead and hydrogen chloride solution is overflushed by the flush fluid into filtering part of the well. After ECP startup in enlarged extraction rate from the slope wellhead samples are taken periodically in order to check pH value, monitor dynamics in changes of fluid supply from the slope wellhead. When pH value id recovered up to the normal value ECP is started into operation from the vertical wellhead and supply from the slope wellhead is returned back to normal operation mode.

EFFECT: effective treatment of bottomhole and filtering zone of the well, cleaning of the pump operating elements from salts and simultaneous technology simplification due to exclusion of tripping operations.

1 ex, 1 dwg