METHOD FOR SIMULTANEOUS FORMING SEVERAL WELL BORES Russian patent published in 2005 - IPC

FIELD: oil production, particularly for drilling oil and gas well cluster.

SUBSTANCE: method involves lowering pipe string into casing pipe, wherein pipe string has deflector connected to one end thereof; opening-out casing pipe within the necessary range; alternately lowering flexible tube having nozzle in pipe string up to reaching opened-out casing pipe area under the action of the deflector; supplying high-pressure liquid through flexible tube having nozzle simultaneously with translation thereof for necessary length to form additional well bores; initial removing flexible tube from pipe string and turning pipe string with deflector through necessary angle to obtain required number of additional well bores; final removing flexible pipe with nozzle out of casing pipe. The casing pipe is opened-out over the full diameter thereof within the necessary range and after casing pipe opening deflector is installed in opened area. After additional well bore forming and before pipe string with deflector rotation flexible tube with nozzle is removed from opened-out area of casing pipe.

EFFECT: reduced number of round-trip operations for well cluster forming under the action of liquid head and, as a result, reduced costs.

1 dwg