PROCEDURE FOR DEVELOPMENT OF BITUMEN DEPOSITS Russian patent published in 2009 - IPC E21B43/24 E21B7/04 

FIELD: oil and gas production.

SUBSTANCE: invention refers to procedure of bitumen deposit development. The procedure consists in lowering a flow string into a specified interval of a casing pipe, where a deflector is arranged at the end of the flow string, is fixed relative to pipes and is designed to successively rotate at a preset angle; the procedure further consists in mill cutting of process channels in a production reservoir; the mill is secured to the end of a flexible shaft by means of the deflector along perimetre of openings in the casing column; also the procedure consists in pulling the flexible shaft out, in successive forming process channels of required length along perimetre of the casing pipe by means of a flexible pipe with a jet at the end; fluid under pressure is supplied through the jet and forms a row of process channels along perimetre; after extracting of the flexible pipe with the jet, the deflector is freed from connection with the casing column and is fixed below or above the initial installation to facilitate a successive turn at a preset angle, thus forming an additional row of process channels similar to the first one within the boundaries of the same production reservoir; further, the procedure consists in installation of a packer between rows of process channels, in lowering the process string and the internal string with pump equipment, in successive heat carrier pumping via the process flow string and in product withdrawing via the internal column. Prior to lowering the process column is additionally equipped with a tail piece from below and with a capped from below bushing assembled inside the process column above the tail piece with a gap; the bushing is furnished with side channels for communicating an internal cavity with annular space; after installation of the packer, fitted out with the central channel, the process column is lowered till the tail piece interacts with the central channel of the packer leak proof. The internal column is lowered till leak proof interaction; notably, from below the column is preliminary furnished with a nipple. Heat carrier is pumped through gaps of the bushing and through the tail piece into low rows of the process channels, while product is withdrawn via the side channels and the nipple from upper process channels.

EFFECT: increased reliability of procedure due to reduced number of applied packers; also increased efficiency of heating of high viscous oil deposits with heat carrier, when density of heated oil is below density of heat carrier.

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