METHOD FOR SECONDARY DRILLING OF PRODUCTIVE FORMATION WITH CREATION OF SYSTEM OF EXTENDED DRAIN CHANNELS AND DEVICE FOR ITS IMPLEMENTATION

The invention relates to oil and gas industry and can be used for secondary drilling of productive formations. The essence of a method for secondary drilling of a productive formation is characterized in that a rock drill is lowered into a well at a preset depth on a tubing string, the rock drill is provided with a mechanism for holes formation in a casing string and a bent channel for movement of a jet head attached to a high pressure connection hose due to a coiled tubing put down from the borehole mouth to which a high pressure connection hose is connected, fixing the rock drill in the casing pipe, open the casing pipe circumferentially at one level using the mechanism of holes formation thus forming a system of extended drainage channels positioned on the same level in different directions against well axis, controlling the position of the cutting tool and the jet head, determination of drainage channels number, their direction and extension. A device for implementing said method comprises a housing with lateral holes arranged in the piping string, a movable block is installed in the housing adapted to axial movement and rotation, the movable block is tightly fixed therein with the mechanism of holes formation in the piping string and the bent channel for moving therein and providing an outlet into hole clearance of the high pressure hose with the jet head attached thereto. The device is also provided with the mechanism of housing fixation in the borehole and control elements of the cutting tool and the jet head positions, providing monitoring information to the borehole mouth. The technical result provides working out high-technology method of secondary drilling of productive formation forming a system of extended drainage channels and the device for implementation thereof. Изобретения относятся к нефтегазодобывающей промышленности и могут быть использованы при вторичном вскрытии продуктивных пластов. Сущность способа вторичного вскрытия продуктивного пласта: спускают в скважину на заданную глубину на колонне насосно-компрессорных труб (НКТ) перфоратор, снабженный механизмом формирования отверстий в обсадной колонне и изогнутым каналом для перемещения в нем гидромониторной насадки, присоединенной к рукаву высокого давления, за счет подачи с устья скважины колтюбинговой трубы, к которой присоединен рукав высокого давления, фиксируют перфоратор в обсадной колонне, вскрывают по окружности на одном уровне обсадную колонну механизмом формирования отверстий