METHOD OF SWABBING WELLS WITH LOW FORMATION PRESSURE AND DEVICE FOR ITS IMPLEMENTATION Russian patent published in 2020 - IPC E21B43/18 

FIELD: oil and gas industry.

SUBSTANCE: group of inventions relates to oil and gas industry and can be used in development of wells after drilling and during operation. Proposed method comprises running in well of tubing string with filter and valve. Valve is installed below the swab operating interval, but above the filter. Packers on anchors are installed above productive bed. Fluid from the well is removed through said pipe string. Formation is analyzed on smoothly ascending fluid flow with determination of critical bottomhole pressure, at which formation ceases to work. Products are selected taking into account the studies. Packer is equipped with a fixing assembly and installed before the tubing string is lowered. Tubing string is equipped with nipple above the filter. It is made with possibility of interaction with the fixing unit after lowering into the well. Internal diameter of tubing string in interval of operation of swab, its speed and height of lifting is selected so that bottom-hole pressure is not equal to critical bottom-hole pressure.

EFFECT: broader functional capabilities of inventions owing to possibility of use in wells with low formation pressure.

2 cl, 1 dwg