WELL CONSTRUCTION METHOD Russian patent published in 2008 - IPC E21B7/06 

FIELD: oil and gas production industry, particularly to construct oil and gas well cluster in heavy oil reservoirs.

SUBSTANCE: method involves drilling well along with reservoir drilling-in; lowering pipe string in casing pipe in predetermined interval, wherein pipe string has whipstock to be retained with respect to casing pipe so that the whipstock may rotate through predetermined angle; serially cutting windows in casing pipe along casing pipe perimeter by means of cutter secured to flexible shaft end with the use of whipstock to create technological channels in productive reservoir; removing flexible shaft; creating technological channel having necessary length with the use of flexible pipe provided with nozzle at one end thereof adapted to supply high pressure liquid. After flexible pipe removal from pipe string whipstock is detached from casing pipe and fixed over or under initial whipstock location so that whipstock may be rotated through predetermined angle. Then additional channels are created within the same production reservoir in the same way and additional technological channels are enlarged to provide technological channels having necessary length. The second well is construction in the same way so that enlarged technological channels and additional technological channels face each other. Both wells have enlarged technological channels with lengths exceeding that of additional technological channels. After that hydraulic fracturing operations are serially carried out in enlarged technological channels and enlarged additional technological channels along with proppant layer injection to obtain hydraulic communication between corresponding enlarged technological channels. Reservoir is exposed by at least two pairs of the same wells.

EFFECT: increased productive permeable zone of productive reservoir due to performing hydraulic fracturing in technological channels and increased productive reservoir development efficiency due to creation of additional rows of technological channels in the same productive reservoir.

2 cl, 1 dwg