METHODS OF IDELED WELL RECOVERY WITHIN THE CONDITIONS OF ABNORMAL LOW PRESSURE Russian patent published in 2012 - IPC E21B43/16 E21B43/26 

FIELD: well recovery.

SUBSTANCE: invention belongs to the oil producing industry and may be used at a final stage of massive and layered-massive oil reservoir development within the conditions of abnormal low pressure characterized by a thick cap and underplayed bottom water actively penetrating into the effective pay. Essence of the invention: the method involves the carrying out of isolation squeeze and productive formation exposing. According to the invention, initially the permanent plug is installed in the mother bore into the perforation interval and above the roof of productive formation of massive and layered-massive hydrocarbon accumulation. Above the permanent plug, but beneath the kickoff interval of a lower lateral hole a lower isolative bridge is installed. A bottom window is cut in the completion string, whereupon a lower lateral hole is drilled up to the productive formation, provided its completion beyond the colmataged bottom hole zone at the remote distance from motherbore shoe. A casing column is drawn down to the bored lower lateral hole, cemented and perforated without stimulation of well. According to the same technology an upper laheral hole is drilled immediately above a bottom lateral hole, whereupon it is socketed and perforated without stimulation of well. Subsequently formation hydraulic fracturing is carried out in the upper and lower lateral holes within the intervals, located one above another in the vertical directional pattern, with the possibility of upper and lower lateral holes fracture healing and co-formation of drainage area in the bottom hole zone of a productive formation.

EFFECT: opportunity for a maximum oil or gas extraction within the conditions of abnormal low formation pressure.

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