METHOD AND ARRANGEMENT OF HYDRAM FOR BOTTOMHOLE FORMATION AREA AND WELL DEVELOPMENT Russian patent published in 2014 - IPC E21B43/18 E21B43/25 E21B28/00 

FIELD: oil and gas industry.

SUBSTANCE: group of inventions is related to oil industry, and namely to pulse hydraulic hammer treatment of the bottomhole formation area, and well development. Essence of inventions: method includes stratum shutoff by a ring packer, pressure treatment of the bottomhole formation area by cyclic pulses of repression and depression pressure to the bottomhole formation area with pumping out of formation fluid. In order to create repression and depression pressure pulses the below-packer space is separated from the over-packer space. The time is provided for alignment of below-packer pressure with over-packer pressure. Pressure in the over-packer area without injection of working fluid from the surface is made higher for the purpose of direct hydroram or lower than the formation pressure for the purpose of return hydroram. The below-packer space is united with tubing string or below-packer space is united with over-packer space for the purpose of direct or return hydroram. Potential separation or interconnection of the below-packer space with over-packer space or with tubing string is ensured by use of a downhole assembly with a shell, a saddle installed on it and a ring packer, a piston with cross tee, which is moved in the shell by means of the tubing string and potential piston inlet/outlet from the well, a controlled piston valve at the lower butt end of the tubing string interacting with the shell saddle for the purpose of its opening and closing when the tubing string is moved with the piston.

EFFECT: improving efficiency and processability of the method and device due to increase in power and selectivity of hydraulic impact on the bottomhole formation area at simultaneous simplification of the device and method.

5 cl, 5 dwg