SU1208197A1 - Formation opening-up apparatus - Google Patents

Description

The invention relates to the oil and gas industry, namely, devices for drilling holes in the borehole wall.

 The purpose of the invention is to increase the reliability of the device by adjusting the mode of operation and changing the angle of approach of the cutting element.

FIG. i shows the proposed device, the transport position; on - the mechanism of rotation of the flexible shaft.

The device comprises a housing 1, in the lower part of which there are mounted guide rollers 2, cutting elements 3, connected to flexible shafts 4 consisting of a cable on which is wound in the direction opposite to the winding of the cable, a spring. The flexible shaft is laid in the bulk bearing system 5 and connected through ball bearings 6 to gears 7 and 8, transmitting rotation to three flexible shafts 4 "Ledge 9 limits axial movement of the carriage 10. The gearbox shaft passes through sleeve 11 with bearings located in it 1 2 skol1 , through a thrust bearing 3 and goes to the elastic coupling 14, to which rotation of the reversing motor 16 is transmitted from the planetary gearbox 15. The other end of the motor shaft is connected to the planetary gearbox 17. The planar reduction shaft zakontrennye torus through thrust bearings 18, nut 19 comes out of the carriage, and transmits the rotation of the screw pair consisting of a screw 20 and ustanovlen- but "nepodvIizhno nut relative to the housing 21. The device is attached to the cable head 22 with three-core cable 23

The rotation angle control mechanism (FIG. 2), which includes a flexible shaft 4j, has individual locking sectors 24, a thrust rod 25 with a spring 26 and a roller 27, a cylinder 28 a rotary nozzle 29 with balls 30 (not shown), a sleeve 31, telescopic tubes- stops 32-34 associated with flexible shafts 4, centralizer 35 tubes.

The device works as follows.

In working condition, when the device is lowered to a predetermined depth, power 16 is supplied to the motor 16 via three conductors of the cable 23. The motor rotates and rotates three elastic shafts through the planetary and distribution gearboxes. At the same time, screw 20, causing the carriage 10 to move, simultaneously with it the flexible shafts 4 and the telescopic tubes — stops 32-34, through which the shaft of rotation of the flexible shaft 4 passes from the horn 35, which retracts as the flexible shaft moves. Telescopic tube stops prevent

the curvature of the drilling channel, giving the necessary rigidity to the flexible shaft and, due to their variable diameters and the presence of longitudinal grooves, provide the output of drilled

asham before the first screw windings spring; flexible shaft 4. The feed speed of the flexible shaft 4, selected using the gear ratio of the planetary gear 15, is equal to

maximum drilling rate of the metal column, as the most difficult part. When drilling, slags are pushed back by the flexible shaft 4 along a helix (i.e.

wound on the surface of the flexible shaft 4 spring), the program of rotation of the engine is such that when drilling periodically the engine is reversed to improve the process of drilling and ejection accumulated; slags. Upon completion of drilling, a reverse signal is given, and the carriage 10 with flexible shafts 4 is drawn into the body of the device. When this spring flexible shaft 4,

it is wound opposite to the winding of the cable; it protects the flexible shaft from unwinding.

An individual mechanism of the angle of rotation of the flexible shaft (Fig. 2 / works as follows. When the whole device is lowered into the well, the flexible shaft 4 is located in the lower position of the parallel locking sectors 24 when the element 3 is perpendicular to the borehole wall. 3 includes an electric motor 16 (FIG. 1) and, through a gearbox 15, generates a pulling force on the flexible shaft 4, which is removed from the slots of the fixing sectors 24 and fixed in the next x slots of the same sectors

non-stop thrust rod 25. In the future, the mechanism works in the same way.

Fixing sectors have 9 calls every 5. The mechanism can only be used to reduce the angle of inclination of the cutting element to the borehole wall. Therefore, it is important not to skip the mode of operation of the drill, which is needed, since it will not be possible to repeat all the modes in the opposite direction of increasing the angle of inclination of the cutting element 3 to the borehole wall.

For this, the device is equipped with an automatic control of the load on the electric motor on the surface, which allows

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change the high-tensioned position of the flexible shaft 4 to a lower-low, its transfer from the heavy work mode to the light mode.

The mode of operation of the electric motor is transferred from heavy to lightened stepwise according to the program with stopping each time using a rotary contact in the sector of a circle equal to 40 °, where the turning time of the mechanism is 5 ° followed by automatic switching on and off of the electric motor according to the load. The operation mode of the device is also facilitated by the well fluid (water, oil, emulsions, etc.), which reduces the friction between the flexible shaft 4 and the sludge.

1208197

Editor Y. Sereda

Compiled by V.Voriskin Techr) ed M.Parotsay

Order 211/40 Circulation 548 Subscription

VNIIPI USSR State Committee

for and: discoveries and discoveries: 113035, Moscow, Zh-35, Raushsk nab., 4/5

Branch ShSh Patent, Uzhgorod, Proektna St., 4

Proofreader E.Roshko

Claims (1)

DEVICE FOR OPENING THE STRING, containing a power drive, a flexible shaft and a cutting element, characterized in that, in order to increase its reliability by adjusting the operating mode and changing the angle of approach of the cutting element, it is equipped with additional flexible shafts with cutting elements and an individual mechanism of rotation angle of each flexible shaft, made in the form of two parallel fixing sectors rigidly fixed to the housing, connected to the housing of the guide cylinder, inside of which it is installed with axial displacement of the spring-loaded thrust rod ending in a roller, a rotary nozzle inside which a flexible shaft is placed, and an angular sleeve mounted to interact with the roller, with an SS rotary nozzle installed inside the angular sleeve with the POSSIBILITY of interaction with the locking sectors, and the space between swivel nozzle and corner sleeve filled with balls, SU, 1208197 eleven