DEVELOPMENT METHOD OF MULTI-HOLE BRANCHED HORIZONTAL WELLS Russian patent published in 2012 - IPC E21B43/25 

FIELD: oil and gas industry.

SUBSTANCE: method involves well development using tubing string and determination of inflow volumes of each branched shaft drilled from the main horizontal part of the well; at that, tubing is equipped with swab limiter, and development is performed using swabbing cycles. According to the invention, tubing string is equipped prior to lowering with hydraulic deflector with inlet holes and packer, which are located closer to the head relative to inlet channels of deflector, and swab limiter is arranged in lower part of vertical section of tubing string. Besides, development of branched shafts is performed separately for each branched shaft starting from the most distant one from the well head due to in-series introduction prior to development by means of deflector to the chosen branched shaft of tubing string and insulation of this branched shaft from the main horizontal part of the well with a packer.

EFFECT: possible individual development of each branched shaft, including strongly contaminated one, as well elimination of swab blocking, breakage of rope and occurrence of emergency situations in the well.

3 dwg