PROCEDURE FOR INSULATING PERMEABLE SECTION OF PRODUCTION STRING OR PERFORATED INTERVAL OF IDLE FORMATION OF WELL (VERSIONS) Russian patent published in 2010 - IPC E21B33/10 E21B33/12 

FIELD: oil and gas industry.

SUBSTANCE: invention refers to process and production technique of hydrocarbons extraction and can be implemented for insulating permeable section or idle perforated interval of well borehole. According to version 1 and 2 the procedure consists in lowering one or several packers on the flow string of the pump installation for oil extraction into the well and in seating the packers above it. According to version 1 two packers are arranged in the well borehole between a pump and permeable section or idle perforated interval, while at least one by-pass element with hydraulic channels is installed between them; also pressure tightness of the packers is checked after seating. According to version 2 one packer with two sets of packer cups and at least with one hydraulic channel between them is installed in the borehole of the well between the pump and the permeable section or idle perforated interval; also the packer is checked for tightness upon seating. According to version 3 at least two packers are lowered into the well on the string; a disconnector of the string is arranged above the upper packer; also one of the packers is landed higher, while another - lower of the permeable section or idle perforated interval, notably the string above the upper packer is disconnected from it upon seating and tightness check. An additional disconnector of the string and a well chamber with a removable element are placed between the packers.

EFFECT: reduced expenditures for operations, also reduced time for well repair, increased service life of well and underground equipment, and increased production yield.

33 cl, 9 dwg