RESERVOIR PERFORATION DEVICE Russian patent published in 2008 - IPC E21B43/112 

FIELD: oil and gas production industry.

SUBSTANCE: invention is related to oil and gas production industry and in particular to reservoir perforation devices, e.g. for development of reservoir laid of heterogeneous strata or reservoir heterogeneous by area with hard to recover hydrocarbon reserves. Device includes hollow flexible shaft installed in guide assembly and connected via connection elements on its faces with one part to removable cutting tool and with other part to hollow drive rod of flexible shaft, module of device fixation to wellbore wall, unit of circulating fluid supply to cutting tool. At that hollow flexible shaft is provided with central flexible pipe for circulating fluid supply, support multilayer and multiturn springs made of wire of round or ribbon cross section increasing from center to end and concentrically located on the flexible pipe. At that adjacent support springs have different coiling directions. At least one reinforcing cylinder layer is installed between the springs to ensure required tensile strength of flexible shaft.

EFFECT: improvement of operational reliability of the device for reservoir perforation.

7 cl, 2 dwg