METHOD FOR REMOVING OF DEPOSITS FROM FLOW COLUMN OF OIL WELLS Russian patent published in 2017 - IPC E21B37/06 

FIELD: oil-and-gas industry.

SUBSTANCE: invention relates to petroleum industry and can be used in the operation of wells in the tubing of which various deposits are formed. Dynamic effects of the solvent on deposits in pipes as a multi-directional movement of the solvent along the tubing cavity are enabled by alternate movement of two sources of energy and pressure. After filling by solvent of the tubing string further movement of the solution towards subsurface pump is organized by means of excess pressure of associated gas taken through the line from the annulus of an adjacent well. The associated petroleum gas of an adjacent well is injected into tubing of the well to be treated, due to that the solvent penetrates further down until the downhole pump. For reverse movement of the solvent upward the subsurface pump is started until the solvent occurrence at the wellhead. The cyclic movement of the solvent up and down is repeated until its dissolving capacity is depleted, for example, when its density is stabilized.

EFFECT: method improving the efficiency of solvent washing in the wells with deep dynamic fluid level in annulus, that reduces time for removal of deposits.

4 cl, 2 dwg