SWABBING METHOD WITH WELL MONITORING Russian patent published in 2010 - IPC E21B47/00 E21B43/25 

FIELD: oil and gas industry.

SUBSTANCE: tubing strings are lowered to the well. Liquid is removed from the well via the above tubing string. Packer and instruments are installed on anchors. Prior to swabbing, the well string is packered. Central hole at the end of tubing string is closed with a detachable valve. Liquid is removed from tubing string. If necessary, liquid is removed from inter-tube space through the hole made in lower part of that string. In case it is not required to remove liquid from inter-tube space, the tubing string closed with a detachable valve is lowered without adding the liquid to it and with air available in it. Detachable valve is taken out with a grab on the cable, or the well string is unpackered. Examination with instruments is performed and filter is cleaned at smoothly ascending fluid flow. Bottomhole pressure of fluid, at which the formation stops working at ascending flow, is approximately equal to the value of bottomhole pressure, at which the formation begins working at decrease of the well liquid level. Installation depth of bottomhole pump is calculated.

EFFECT: increasing swabbing depth, reducing the time required for it, smooth change of level and pressure of the well liquid, reliable and accurate recording of the processes performed in the well.