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. Tubing string is equipped with swab limiter. Development is performed in swabbing cycles. According to the invention, tubing is equipped prior to lowering with two centralisers and packers between which outlet channels are located. Swab limiter is arranged in lower part of vertical section of tubing string. Development of branched shafts is performed individually for each branched shaft starting from the most remote one from the well head by cutting out the inlet of the chosen branched shaft in the main horizontal part of the well by means of packers from other branched shafts. After packers are installed, first acid treatment of the chosen shaft is performed by injection of 10-15% solution of inhibited chlorhydric acid based on 0.2-0.25 m³ per metre of the length of branched shaft with further process exposure.

EFFECT: possible development of branched shafts separately for each branched shaft without entering this one, acid treatment prior to development with elimination of occurrence of emergency situations in the wells.

2 dwg