WELL FLUSHING METHOD Russian patent published in 2011 - IPC E21B37/06 

FIELD: oil and gas industry.

SUBSTANCE: well flushing method involves flushing with water solution of mixture of neonols AF₉-12 and AF₉-6; ratio of neonols AF₉-12 and AF₉-6 in mixture is 1:(4.5-5.5) respectively; water solution of mixture of neonols of 4.5-5.5% concentration is used; samples of asphalt-resin-paraffin deposits are pre-removed from the well and samples with undisturbed structure are taken; samples are built up on metal plates, submerged into the above solution and swelling time of samples by spectrophotometry method to balanced condition and the formation time of particles with asphalt-resin-paraffin deposits of minimum sizes in the flow of the above solution is determined, and bath of the above solution is arranged before flushing in the well; minimum time of bath is accepted equal to swelling time of samples to balanced state, and maximum time - during the formation period of time of particles with minimum sizes of asphalt-resin-paraffin deposits in flow of the above solution.

EFFECT: increasing well flushing efficiency.

3 ex, 1 tbl, 1 dwg