FIELD: oil and gas industry.
SUBSTANCE: method of treatment of a bottomhole zone of a production well with an operating well borehole pump includes a pipe string lowered to a production well with a sucker rod pump inserted into the lock support of the pipe string, pumping of acid into the bottomhole zone of the production well, holding the well and subsequent extraction of oil from the production well. At that, the sucker rod pump drive is stopped, the pump unit, liquid flow switch, tank truck with acid, tank truck with anticorrosion liquid and chute tank are installed and hydraulically connected to each other. After that the well is analyzed by liquid level extraction in annular space of the well. Include drive sucker rod pump and produce download anticorrosion fluid in the well annulus in volume of 1.5-3 m3,not exceeding 2.0 MPa injection pressure. At the same time sucker rod pump pumping oil from well to line. Drive of sucker rod pump is stopped and liquid level in annular space of the well is expected to decrease. After that, the well is analyzed by repeated liquid level bleeding in the annular space of the well. Rod-type bottom-hole pump is withdrawn from the lock support of the pipe string; acid is pumped into the well string. Then, by pumping anticorrosion liquid in pipe string into 1.25 of pipe string volume, acid is forced from pipe string through bottomhole zone of the well into formation. Production well for reaction of acid in bottomhole zone is followed by pumping anticorrosion liquid into annular space of well in 1.25 volume of pipe string, rod bottomhole pump is installed into lock support of pipe string, drive of sucker-rod pump is started, and waste liquid is pumped by sucker-rod pump from the formation into flute tank to neutral pH, after which oil is extracted from production well.
EFFECT: reduction of negative effect of acid on production string and underground equipment, elimination of environmental contamination due to spillage at the wellhead of acid during installation and dismantling of equipment at the wellhead with simultaneous reduction of costs for implementation of the method and reduced duration of treatment of the bottomhole zone of the production well.
1 cl, 4 dwg
