RU80499U1 - DEVICE FOR RADICAL DRILLING OF UTILED WELLS - Google Patents

Abstract

A device for radial drilling of cased wells is intended for the formation of radial channels with a depth of tens of meters. The device comprises a housing (1) with a curved guide (6), a flexible shaft (2), a downhole hydraulic motor (7), a drum (8), a continuous flexible pipe (9) and a cutting head (5). The housing (1) is lowered into the well by means of a tubing string (13) and secured to it by means of an anchor (14). A downhole hydraulic motor (7) with a flexible shaft (2) and a cutting head (5) is lowered into the cavity of the tubing string (13) by means of a continuous flexible pipe drive (9). In the formation of radial channels, rotation of the cutting head (5) gives the hydraulic downhole motor (7), and axial displacement is a continuous flexible pipe (9). 1 ill.

Description

The utility model relates to the field of the oil and gas industry and is intended for radial drilling of cased wells at the opening of productive horizons.

Known devices for radial drilling of cased wells (RU 19086 U1, 2001.08.10; RU 2286442 C1, 2006.10.27), comprising a housing with a curved guide, a flexible shaft (flexible rod), axial movement and rotation of the flexible shaft, and a cutting tool. The mechanism of rotation of the flexible shaft is made in the form of a hydraulic downhole motor (HLD), which can be used as a serial screw downhole motor, adapted to work with flushing fluid. The mechanism of axial movement of the flexible shaft is made in the form of a hydraulic cylinder, the piston of which is the hydraulic valve body with a sealing device fixed to it, and its rod is a flexible shaft connected to the output shaft of the hydraulic valve, while the cylinder of the hydraulic cylinder is rigidly connected to the device body. The casing of the device with a cylinder is lowered into the casing by means of a tubing string. GZD and a flexible shaft are lowered into the cylinder by means of a load-bearing electric cable. The depth of the radial channels drilled by known devices is determined by the dimensions of the cylinder in which the piston moves. In order to drill a channel three meters deep, it is necessary that the height of the cylinder is more than three meters. Accordingly, to obtain a channel with a depth of one hundred meters, it is necessary that the height of the cylinder be more than one hundred meters. The manufacture of a long cylinder (more than three meters) is fraught with great technological difficulties, and its installation in the well and subsequent maintenance require special

equipment. The theory and practice of using known devices show that these devices are economically feasible to obtain radial channels with a depth of not more than three meters.

The objective of this utility model is to create a device for radial drilling of channels whose depth is tens of meters.

The problem is solved in that in a device for radial drilling of cased wells containing a body with a curved guide, a flexible shaft, a mechanism for rotating a flexible shaft, made in the form of HLD, the axial movement of the flexible shaft and cutting tool, the axial movement of the flexible shaft is made in the form of a drum and a continuous flexible pipe wound on the drum, while the valve body is connected to a continuous flexible pipe. Implementation of the axial movement mechanism of the flexible shaft in the form of a drum and a continuous flexible pipe wound around the drum, and the connection of the hydraulic sheath with a continuous flexible pipe allow to exclude a long cylinder from the device design, thereby solving the problems associated with the formation of deep (more than three meters) ) radial channels. A new embodiment of the device for radial drilling of cased wells allows for the drilling of channels whose depth is ten times greater than the depth of channels drilled using known devices.

The drawing shows a diagram of the inventive device.

The inventive device for radial drilling of cased wells includes a housing 1, a flexible shaft 2, a mechanism 3 for rotating a flexible shaft, a mechanism 4 for axial movement of the flexible shaft, and a cutting tool 5. In the body 1, a curved guide 6 is made to change the direction of the flexible shaft. The mechanism 3 of the rotation of the flexible shaft is made in the form of HLD 7.

The mechanism 4 of the axial movement of the flexible shaft is made in the form of a drum 8 and a continuous flexible pipe 9 wound on a drum. Housing 10

connected to one end of a continuous flexible pipe 9, the other end of which is fixed to the drum 8. The output shaft 11 of the hydraulic quick coupler is connected to the flexible shaft 2. In the embodiment shown in the drawing, the cutting tool 5 is made in the form of a cutting head and mounted on the end of the flexible shaft 2 (in in other embodiments, the cutting tool can be installed in the cartridge, as is done in the device according to the patent RU 2286442). Pos. 12 in the drawing the casing is indicated, pos. 13 - tubing string, pos. 14 - anchor

The inventive device operates as follows.

The housing 1 of the device is lowered into the casing 12 by means of tubing string 13 and secured into it by the armature 14. Then, the drive (not shown in the drawing) is turned on by a continuous flexible pipe 9, which, reeling off the drum, lowers the hydraulic manifold 7 and the flexible shaft 2 into the cavity of the string The tubing, while the flexible shaft with the cutting tool fall into the curved guide 6. Lowering is carried out until the cutting tool 5 touches the wall of the casing 12. After that, fluid is supplied to the inlet of the hydraulic control valve, the output shaft of which rotates the flexible shaft 2 with the cutting tool cop 5. Simultaneously with the rotation of the flexible shaft give axial movement. The cutting tool cuts through the wall of the casing 12, penetrates into the rock and forms a channel, the depth of which can reach one hundred meters.

Thus, the claimed device, in contrast to other known devices having a flexible shaft with mechanisms for its rotation and axial movement, allows tens of times to increase the depth of the radial channels in cased wells.

Claims (1)

A device for radial drilling of cased wells, comprising a housing with a curved guide, a flexible shaft, a flexible shaft rotation mechanism made in the form of a downhole hydraulic motor, a flexible shaft axial movement mechanism and a cutting tool, characterized in that the flexible shaft axial movement mechanism is made in the form of a drum and a continuous flexible pipe wound on the drum, while the casing of the hydraulic downhole motor is connected to the continuous flexible pipe.