SU1250640A1 - Drilling tool - Google Patents

Description

2. The tool according to claim 1, about tl and h a yusch and the fact that the stops telescopic

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The invention relates to a drilling technique, in particular, to tools for drilling large diameter wells, preferably with backwash with simultaneous or sequential pacnmpetraeM.

The purpose of the invention is to increase the reliability of operation of the drilling tool due to the possibility of controlling the expansion diameter for any expansion diameter. The possibility of a centralizer turning in the well is reduced.

1 shows a diagram of a drilling tool; figure 2 is a device, top view; Fig. 3 is the same when the drill rod is displaced; Fig. 4 shows the centralizer control mechanism.

A drilling tool consists of a drill rod 1, a bit 2, a centralizer 3 located on the drill rod 1, and a mechanism 4 for controlling the centralizer. The centralizer is made in the form of a support frame 5 having the shape of an equilateral triangle. Parallel to the sides of the triangle are rigidly fixed to the supporting frame 5 telescopic rods 6, on the outer ko.ntsy which are fixed lugs 7. Telescopic rods 9 are fixed by external ends with the help of hinges 8 to the vertices of an equilateral triangle 10. Each bearing 10 is installed on the drill rod 1 with the possibility of independent from each other rotation. The support frame 5, the telescopic rods 6 and 9, the stops Y, the hinges 8 and the supports 9 form the centralizer 3.

The mechanism 4 controlling the centralizer 3 is located on the surface and is made in the form of a piston pair and consists of a cylinder 11, a piston 12 and a screw stop 13. A screw stop 13 is fixed by means of a thread on

The rods are located in the direction of rotation of the drilling tool.

the cylinder 11 with the possibility of axial movement and serves as a limiter for the movement of the piston 12 as it moves upwards. On the piston 12, 5 freely moving in the cylinder 11, a scale 14 is applied. The cavity of the control mechanism 4 is connected to the hermetic cavity of the telescopic rods 6 and 9 by means of a hose 15.

0 Drilling tool works as follows.

The recess without expansion is produced by rigidly centering the axis of the drill rod 1 and the bit 2 s.

5 by means of a centralizer 3 controlled by the control mechanism 4. Chisel 2 and drill rod 1 rotates coaxially with the well, and centralizer 3 with telescopic

0 by the rods 6 and 9 and the supporting frame 5 by means of the bearing support 10 remains stationary.

With an increase in the diameter of the well (by drilling with chisels or po5 it into the floating rocks) in the process of dredging with a rigid centering of the drill rod 1 piston of the telescopic rod 6 due to the fact that it is spring-loaded,

0 with the stop 7 move from the cylinder to the expansion section, reducing the pressure in the hermetic cavity of the centralizer 3. At the same time, through the hose 15, the pressure decreases in the hermetic cavity of the control mechanism 4, which causes the piston 12 of the control mechanism 4 to move. The magnitude of the movement of the piston 12 is marked on a scale of 14,

0 by which you can judge the change in diameter of drilling.

If necessary, the planned increase in well diameter, i.e. when it is forcedly expanded, the research institutes raise the screw bolt 13 to the required position, ensuring the piston 12 to move freely from bottom to top. Then increase the speed of rotation31

neither the drilling tool (depending on the required expansion diameter), the bit 2 of which, due to the unbalance of the drilling tool and the flexibility of the drill string, drills the hole wall. The amount of expansion of the well is limited by the stroke of the pistons in the cylinders of the telescopic rods 9, i.e. cylinder lengths of telescopic rods 9. The length of cylinders of telescopic rods 6, placed on the sides of a triangular support frame 5 is longer than the length of 506404

Lines of telescopic rods 9. Therefore, at any possible diameter of expansion, the cylinder of telescopic rod 6, rotated and vibrated with the borehole walls, allows to record the actual diameter of the expansion and makes it possible to correct this diameter by means of the control mechanism 4.

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After the end of the well spread, the pressure in the cavities of the telescopic rods is reduced and the drilling tool is pulled to the surface.

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Editor M. Nedoluzhenko

Compiled by L. Cherepenkin

Tehred M. Khodanich Proofreader S. She KMAR

Order 4382/24

Circulation 548 Subscription

VNIIPI USSR State Committee

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

Production and printing company, Uzhgorod, st. Project, 4

;four

FI.4

Claims (2)

1. DRILLING TOOL, including a drill rod with a chisel, a centralizer made in the form of a support frame, bearing bearings mounted on the drill rod with the possibility of independent rotation, telescopic rods, the inner ends of which are mounted on bearing bearings, and the outer ends are connected to the hinges with a supporting frame, and telescopic rods with stops attached to the outer surface of the supporting frame, and a centralizer control mechanism, characterized in that, in order to increase reliability in operation, the supporting frame is made but in the form of an equilateral triangle whose vertices are arranged hinges outer ends of the telescopic boom, the telescopic rod rasps lozheny along the sides of the supporting frame. SU .... 1250640 Fig t 2. The tool according to π.1, on the basis of them, and the fact that the stops of the telescopic rods are located in the direction of rotation of the drilling tool.