PROCEDURE OF WELL BOTTOMHOLE ZONE TREATMENT Russian patent published in 2010 - IPC E21B43/18 

FIELD: oil and gas industry.

SUBSTANCE: invention refers to mining and can be used for development and rejuvenation of production well yield dropped because of bottomhole zone mudding with asphalt-pitch-paraffin formations and mechanical impurities. The procedure consists in pumping fluid into a well, in forming a depression differential between the bottomhole zone and cavity of the well by generating periodic pressure pulses in the bottomhole zone in form of a wave spreading along cavity of the well and produced at periodic opening cavity of the well at the wellhead for well fluid under pressure flowing out, and at its closing by valves; one of the valves designed for fluid draining connects cavity of the well with a drainage tank, while the second valve - the valve of fluid topping up- connects cavity of the valve with a source of fluid under pressure. Cavity of the well at the wellhead for draining well fluid under pressure is closed and opened by means of a fluid draining valve. Pressure in the well is periodically built up by connecting the wellhead with the source of fluid under pressure by opening the valve of fluid topping up. According to the invention the wellhead is preliminary connected with a receiver filled with gas. The valve of fluid draining is opened through a valve while the above said valve is closed. Further, the valve connecting the wellhead with the receiver is opened in an interval of time sufficient for forming an impact wave of depression. The valves open with frequency facilitating excitation of fluid weight in a resonance mode.

EFFECT: facilitating increased efficiency of procedure due to combining pulses of depression and excitation of weight of column of well fluid into condition of resonance reciprocal motion.

1 dwg