METHOD FOR REMOVING DEPOSITS FROM BORE-HOLE PUMP AND FLOW COLUMN Russian patent published in 2012 - IPC E21B37/06 

FIELD: oil and gas industry.

SUBSTANCE: method involves supply of solvent to bore-hole pump inlet by means of flexible wear-resistant small-diameter tube through annular space. The required amount of solvent is supplied under packer through its transient channel with non-return valve at the stopped bore-hole pump and closed damper at the outlet of flow column on the well head. After that, such solvent volume V₁ is supplied by means of bore-hole pump from the available solvent volume under the packer to flow column, which will fill in the flow column space free from deposits. Well is stopped for the period of time required for dilution of maximum possible part of deposits with volume V¹ _deposit; after that, during the second cycle the solvent with volume V₂ = V₁ + V¹ _deposit is pumped with bore-hole pump to flow column with further dilution of deposits at the stopped well. Such cyclic filling of flow column with the solvent is continued until the solvent coming out of flow column onto the well head contains inconsiderable content of deposit elements.

EFFECT: improving the cleaning quality.

2 cl, 1 dwg