HYDRAULIC MECHANICAL BOREHOLE PERFORATOR Russian patent published in 2022 - IPC E21B43/11 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to the field of oil and gas production, and more specifically to the technique of pipe perforation. The hydraulic mechanical borehole perforator includes a pipe body, a deflector and an anchor connected to each other. In this case, the pipe body and the deflector are equipped with a guide in which a drive with a flexible shaft and a cutting tool is placed. At the same time, the specified drive is placed in the pipe body and consists of a block of control of the final positions of the cutting tool in the form of a geophysical device, a mechanism for rotating the flexible shaft in the form of a screw downhole motor, a mechanism for axial movement of the flexible shaft in the form of a piston, connected in series on a suspension in the form of a logging cable. Moreover, the flexible shaft with the cutting tool is placed in the deflector guide, and all drive elements and the flexible shaft are equipped with a flow-through hydraulic channel made with the possibility of interaction with the cutting tool. In this case, the perforator is equipped with a keyed joint. The perforator is additionally equipped with a spring block located below the downhole motor and connected to its output shaft, as well as an extension cord connecting the spring block and the flexible shaft. In this case, the specified spring block is made in the form of a spring placed in the housing. The perforator in the zone, starting from the body of the geophysical instrument to the deflector, is equipped with an internal housing made up by means of a coupling, installed coaxially with the pipe body and rigidly connected to it. At the same time, the upper part of the inner housing up to the coupling covers the area of placement of the geophysical instrument, and the lower part of the inner housing below the coupling covers the area of placement of the screw downhole motor. At the same time, the geophysical device is equipped with sensors for reading magnetic labels placed in two rows located diametrically opposite in the upper part of the inner housing in the area of the geophysical device. Moreover, the zone of placement of the geophysical instrument is additionally equipped with a partially split guide cylinder installed coaxially with the inner housing with two through diametrically arranged longitudinal slots, the upper part of which is made in the form of two V-shaped sections, and the lower part of the specified cylinder is mounted with an emphasis on the coupling connecting the upper and lower parts of the inner housing. In this case, the length of the through longitudinal slots of the guide cylinder is equal to the amount of movement of the cutting tool outside the perforator to the required drilling depth. The keyed joint of the perforator is made in the form of two spring-loaded keys installed diametrically opposite on the outer surface of the body of the geophysical instrument and made with the possibility of their extension into the through longitudinal slots of the guide cylinder.

EFFECT: increase in the positioning accuracy of the geophysical instrument installation in one descent, an increase in the operational reliability of the perforator due to the guaranteed exclusion of the breakage of the logging cable.

2 cl, 3 dwg