SU1213169A1 - Flexible drilling string - Google Patents

Description

 one

The invention relates to a drilling technique, namely to flexible drilling rigs of drilling machines used for drilling wells in mining and construction.

The purpose of the invention is to expand the field of application by enabling the drilling rod to work with both submersible (downhole) and surface (located on the frame of the drilling machine) actuators, i.e. Expansion of technological capabilities

Fig. 1 shows a node for connecting the rods of a flexible drill rod with a lock made in the form of clips, top view} in Fig. 2 - a lock in the form of clips during drilling, general view, in Fig. 3 - section A - A in figure 2; FIG. 4 is a section BB in FIG. 2; Fig. 5 shows a unit for connecting rods with a lock of threaded couplings and nipples,

A flexible drilling rig contains a plurality of hollow rods 1 and 2 wound onto a drum (not shown), the stiffness or flexibility of the joint being determined by the relative position of the rods located in the inner cavity and fixed at their adjacent ends of the hinge and the lock. The hinge is made in the form of a cardan consisting of a cross 3, forks 4 and 5, at least one of which, for example, a fork 4, is fixed on the rod 1 with rotation and limited by 2 axial movement (along arrows, fig. 1) through the sleeve 6, which the flange 7 interacts with the annular protrusion 8 of the rod 1 and the stopper

9, screwed into the end of the bar 1. The cross of the other is fitted with a sleeve

10, which can be fixed to the rod 2 or rigidly (FIG. 5) by means of a threaded stopper 11, in a non-circular axial hole of which the sleeve 10 of the counter-section is omitted, pressed to the stopper 11 by a nut 12, or the same as sleeve 6, with the possibility of free axial rotation, for which the sleeve

 10 is fixed in the rod 2 by means of a bearing unit 13c with a nut 12,

The lock is made in the form of interchangeable rods 1 and 2 fixed at the ends and interacting with each other when drilling nipples and couplings, freely

ten

15

20

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covering cardan. Each shtangg and hinge (cardan) are made with intercourse cavities 14, 15 and 16, in which an elastic tube is installed

5 17, made on one side with a mounting flange 18, and the other side is fixed at the end of sleeve 6 by a cone-shaped internal bore at the end of sleeve by means of a shaped nut 20 at the end of the tube with a cone 19 in the conical internal groove on the end of the sleeve. 21, in the latter and in the wall of the rod 2, below the location of the jumper 21, holes are made in which check valves 22 and 23 are installed. Two versions of locks are provided for securing the rigid connection of the rod 1 with the rod 2 during drilling. For the first of them (figure 1), the nipple is made in the form of a yoke 24, provided with L-shaped

25 protrusions 25 with sloping side. the end face is 26, and the coupling is in the form of a clip 27 with longitudinal slots 28 of the response form.

In the second embodiment (figure 5)

30, the nipple and the coupling are made in the form of a hollow cone screw 29 screwed into the cone nut 30. The sleeve 6 is connected to the rod 1 with the possibility of free relative rotation by means of a bearing unit 31, in the shaped (not round) opening of which the sleeve 6 is freely omitted section. Rod ends

40 can be moved one relative to the other along the longitudinal axis to distance 6 including distance and E this movement occurs without interaction of the coupling with

45 with a nipple, which is provided for avoiding breakage of the rods as a result of the interaction of their ends when turning through the angle t (, (dashed lines, FIG. 1).

ijQ The device works in the following way.

When drilling a well, a rigid connection of the rods entering it is provided, for which purpose

jg rotating rod 2 on rotating rod 1 with the same speed. As a result of this protrusion 25, I will interact with the inclination of the ends 26

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(Fig. 2 with the surfaces of the slots 28 which are responsive to them, are connected to them and, through L-shaped surfaces, transmit a torque force from a drive (not shown) rotating the rod 2 on the day surface to rod 1 located in The reversing of the delivery of the rod 1 with the constant direction of its rotation is realized by the interacting in this case horizontal surfaces of the protrusion 25 and the groove 28. The rods are centered while drilling one relative to the other with

Using radial bevels on the protrusions and grooves (Fig. 4), the connection of the nipple and the coupling by thread (Fig. 5) is performed by varying the speed of rotation of the rods 1 and 2, one relative to the other. The removal of the rods is carried out in reverse order. At the same time, the torque, which is already laid on the drum (not shown), is not transmitted from the cylinder to the torque, since the nipple and coupling are disconnected in the e-machine position, and the sleeve 6 (figure 5) or sleeve 6 and 10 (figure 1) rotate freely in the rods.

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Editor I. Nikolaichuk

Compiled by V. Rodina

Tehred O. Vashchishin Proofreader S. Shekmar

758/42

Circulation 548 Subscription VNIIPI USSR State Committee

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

Filial GOSh Patent, g, Uzhgorod, st. Project, 4

0i / 8.S

Claims (3)

1. FLEXIBLE DRILLING STAW, including hollow rods connected by a hinge located in their inner cavity and having means for fixing the rods in a straight position at the ends, which consists in that, in order to expand the technological capabilities of the stand, the hinge is made in the form cardan, at least one of the forks of which is mounted for rotation and limited axial movement, each hinge has an axial channel with an elastic tube, and in the cavity of the rod in front of the hinge there is a jumper with a check valve, and the wall of the rod below the location of the jumpers made a hole blocked by a check valve. 2. Having become pop. 1, it is distinguished by the fact that the means for fixing the rods in the working position are made in the form of tips with profile interlocking protrusions. . 3. Having become according to claim 1, with the fact that the means for fixing the rods in the working position are made in the form of a nipple and a coupling with a threaded connection. SU.,., 1213169> f