PROCEDURE FOR TREATMENT OF BOTTOMHOLE ZONE OF PRODUCER Russian patent published in 2011 - IPC E21B43/16 

FIELD: gas-and-oil producing industry.

SUBSTANCE: procedure consists in lowering coil-tubing pipe through annular space of well, in pumping products for treatment and in start-up of well. As a production string and underground equipment there is used the string and equipment with diametre not over 2.5 inches. The coil-tubing pipe is lowered through annular space of the well with zenith angle of bore incline up to 30° when a well is equipped with 6 and more inch-production string, or with zenith angle of bore incline to 15° when a well is equipped with 5-inch production string. Before pumping products production string is filled with oil above the pump. Pressure in the production string from the wellhead is maintained higher, than in the coil-tubing pipe.

EFFECT: raised efficiency of procedure due to integrity of pump and due to round-trip operation of coil-tubing pipe through annular space of well.

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