SU1682512A1 - Device for stabilization of drilling tools azimuthal direction - Google Patents

Abstract

The invention relates to a technique for drilling directional wells and improves the accuracy of stabilization of the azimuthal direction of the well bore when it deviates from a given direction. The device includes a housing (K) 3 of the main stabilizer (C) 1 and an eccentrically mounted K 4 of an additional C 2 above it. In the longitudinal grooves of the short-circuit and 4 there are placed pushers 5 and 6 and supporting elements 7 and 8 in the form of plates made of elastic material. In this case, C 1 and 2 have hydraulic units. One of the assemblies is designed as a sleeve 11 with an annular piston 12, which forms the upper and lower working chambers 13 and 14 with the inner surface of the sleeve 11 and K 3. The other hydraulic unit is made in the form of plungers 22 located in chambers 24. Hydraulically chambers 14 associated with internal cavities, respectively, short-circuit

Description

This invention relates to a technique for drilling directional wells and is intended to correct the deviation of a wellbore from a given direction.

The purpose of the invention is to improve the accuracy of stabilization of the azimuthal direction of the wellbore.

Fig. 1 shows a device for stabilizing the direction of the drill string; in fig. 2 is a section A-A in FIG. one; in fig. 3 is a sectional view in FIG. one; in fig. 4 - section bb in FIG. 1; in fig. 5 - section GG in FIG. 1; in fig. 6 is a section DD in FIG. 1; in fig

7- section EE in FIG. 1; FIG. 8 is a sectional view 3-3 of FIG. 6; in fig. 9 is a diagram of the operation of stabilizers when the device is placed in a repaired wellbore; in fig. 10 is a diagram of the interaction of the layout of a drilling tool equipped with a device with the walls of a wellbore, view I in FIG. 9.

The device for stabilizing the azimuthal direction of the drill string includes two stabilizers: the primary stabilizer 1 and the eccentric additional stabilizer 2 mounted above it.

8 the main body 3 and the body 4 of the additional stabilizers 1 and 2 are diametrically opposed grooves in which the pushers 5 and 6 and the supporting elements 7 v 8 are arranged in the form of plates of elastic material. The eccentric mass of stabilizers is made in the form of balls 9 and 10. In the cavity of body 3, a shaft of a turbodrill (not shown) is mounted. The hydraulic unit of the stabilizer 1 is made in the form of a sleeve 11 with an annular piston 12 concentrically located on the body 3 with an annular piston 12 forming the upper 13 and lower 14 working chambers with the inner surface of the sleeve 11 and the body 3. The lower chamber 14 is hydraulically connected to the cavity of the housing with 3 openings 15 and sealed with seals 16. The upper chamber 13 is equipped with an epiploon 17, excluding

ingress of particles into it. The pushers 5 have a stepped configuration, are located in the upper chamber 13 and are spring-loaded relative to the housing 3 in

axial direction springs 18. In the annular piston 12 of the main stabilizer 1 at the base of the upper working chamber 13 there is a cavity 19 in the form of spaced V-shaped communicating inclined

prisms whose side edges are at an angle of 20 to each other are parallel to the end plane of body 2 and are symmetric about the plane of eccentricity (deflector plane). Ball 9

accommodate; in the cavity 19.

The housing 3 is equipped with connecting threads 20 for coupling it with the arrangement of the drilling tool. On the top coupling

housing 3 there is an alignment mark 21, corresponding to the eccentricity plane (deflector plane),

Additional hydraulic unit

the stabilizer 2 is made in the form of two plungers 22 with seals 23, which are located above the pushers 6 in the chambers 24, which are made in the housing 4 and are hydraulically connected to its internal cavity with the openings 25. The stabilizers 6

2 are provided with stops 26, which are placed in pockets 27. Pockets 27 are embedded in housing 4 in the form of radially directed A-shaped prisms, the side edges of which are at an angle of 20

to each other, parallel to the end plane of the housing 4 and symmetrical with respect to the eccentricity plane (deflector plane). The cavities of the pockets 27 are in communication with the grooves in which the pushers 6 move. The balls 10 are placed in the pockets 27 with the possibility of radial movement. The upper connecting thread 28 is eccentric with respect to the axis of the housing 4. The magnitude of the displacement of the axes is Ј, the direction of eccentricity is indicated by the mounting mark 29 on the upper and lower ends of the housing A.

The stabilizer 2 is equipped with an installation sub 30, on which there is a cylindrical stop thread 31 for connection with the housing 4, seals 32, adjustment rings 33 and a scale 34.

The stabilizer 2 is equipped with a bushing (not shown) for connecting threads of 35 sections of the rotor shaft of a downhole motor 36. The bushing is mounted on radial bearings in the cavity of the housing 4.

The device for stabilizing the azimuthal direction of the drill string works as follows.

Using the connecting threads 13 and the installation sub 30, the assembly is sequentially assembled (Fig. 10): chisel 37. stabilizer 1, downhole motor 36, stabilizer 2. The assembly is oriented in such a way that the installation marks 21 and 29 are on the same component of the assembly. This is achieved by adjusting the thickness of the adjusting rings 33 using the scale 34 on the installation sub 30. Next, lower the layout with the unhooked hook into the well before the slab. Uncircuit hook block. A channel (not shown) provides free rotation and self-orienting of the device in an inclined shaft.

If the wellbore has a flat curvature, i.e. the borehole azimuth does not vary, the device is located in the barrel symmetrically relative to the alsidal plane (Fig. 3-6) due to the fact that the weight of the drilling tool attached to point 02 is greater than the weight of the assembly with stabilizers, the center of gravity of which is top at point Oi.

The position of the balls 9 and 10 in the cavity 19 and in the pockets 27 is symmetrical with respect to the deflector plane, which coincides with the apsidal plane of the wellbore.

When the drilling pump (not shown) is turned on, the annular piston 12 and the plungers 22 act on the pushers 5 and 6, but the supporting elements 7 and 8 do not compress, as in the stabilizer 1 the ball 9 is in the middle between the lower ends of the pushers 5 and when the annular piston 12 moves upward, the pushers 5 freely enter the cavity 19 without transferring the compressive force to the supporting elements 7, and in the stabilizer 2 the balls 10 under the stops 26 of the pushers b in the lower ends of the pockets 27 prevent the supporting elements 8 from engaging (FIG. 7).

With a spatial curvature of the borehole, for example, with increasing azimuth (Fig. 9 and 10), the center of gravity

The layout 0 is shifted to the right relative to the center of gravity of the drilling tool due to eccentricity. Since the boring tool is lowered with the unhooked hook, and the friction forces against the borehole walls

5 do not affect the orientation of the eccentric structure, the arrangement is rotated by angle #, which is determined from geometric constructions (Fig. 9 and 10) using the formula

arrglnLsin ± Ag {1)

Y28v

where ± A is the change in the azimuth of the well in the section of the trunk of length L, rad;

L is the length of the layout, m; B - eccentricity, m,

Since the angle A is small, formula (1) can be written as

g arcsin ±

LAp 2e

(2)

moreover, the + sign corresponds to the growth, and the sign - to the decrease in the azimuth of the well.

If the rotation angle of the layout t / J is greater than the angle 0, then the device corrects the deviation of the wellbore from the design

azimuth, namely included; The supporting elements 8 at the upper stabilizer 2 - the right element at the lower stabilizer 1 - the left supporting element 7 (FIG. 9). This happens as follows.

when the drilling pump is turned on, the annular piston 12 moves upward under the action of pressure in the lower chamber 14. The ball 9 occupies the right (in FIG. 9) position in the base 19, the annular piston 12,

I act through the ball 9 and the pusher 5, located on the right, on the supporting element 7, causes plastic deformation of the latter and an increase in the protrusion, which creates a lateral force F directed towards the deviation of the barrel from the design azimuth. On the bit 37, an oppositely directed force B arises which corrects the azimuth.

The upper stabilizer 2 creates a lateral deflecting force G directed to the left side (Fig. 9), since the left supporting element 8 is turned on, and the supporting element located on the right is turned off, because the right ball 10 occupies the lower position in the pocket 27 and It prevents the stop 26 from moving downward under the action of the plunger 22. The left supporting element 8 is included, so

as the left ball 10 appears in the near

to the center of the body 4 end of the pocket 27 and does not prevent the movement of the pusher 6.

If the azimuth of the well decreases, then the picture appears symmetrically depicted in FIG. 9 and 10.

When the mud pump is turned off, for example, before the next buildup of the drilling tool, the plungers 22 and the annular piston 12 return to their original position under the action of elastic forces of the elements 8 and springs 18, the Balls 9 and 10 are released from the clamp, the device assumes the transport position.

After the drilling tool has been expanded, the process is repeated, and the direction of the deflecting effect on the bit 37 is always opposite to the azimuth direction.

A layout with stabilizers is used, including dopoto Sh2 15.9 MH-GV, 5K-214 over-bit calibrator, spindle 195, main stabilizer 1, ZTSS-1 turbo drill 195 - 2 sections, additional stabilizer with eccentricity e 8.5 mm, UGB -178 - 12 and boring tool TVPV-127 X 9 - the rest.

A constructive solution allows to improve the accuracy of stabilization of the azimuthal direction of the wellbore, which ensures a reduction in the number of flights by a turbine diverter for adjustments to the azimuth of the well in case of natural curvature of the wellbore.

Claims (1)

Formula of isobreteny A device for stabilizing the azimuthal direction of a drill string, comprising a main stabilizer body with supporting elements in a lead of plates of elastic material and an eccentric mass in the form of a ball, a shaft mounted in a cavity of the body, a sleeve with a ring piston forming the upper and lower working chambers with the inner surface of the sleeve and the body, the last of which is hydraulically connected to the body cavity, and spring-loaded relative respect to the housing in the axial direction of pushers mounted in the upper working chamber otlichayuschee- With that, in order to increase the accuracy of the azimuthal direction of stabilization the borehole, it is equipped with an installed eccentric above the main stabilizer and an additional stabilizer with a hydraulic unit, balls, pushers and supporting elements in the form of plates of elastic material, while the pushers and supporting elements of the main and additional stabilizers are placed in longitudinal grooves that are diametrically opposite in the body of each stabilizer, and in the annular piston of the main stabilizer in the base of the upper working chamber there is a cavity in the form of V-shaped ones communicating oblique prisms whose lateral edges are parallel to the end plane; the body l is symmetrical with respect to the eccentricity plane, and the ball is placed in the cavity, and the hydraulic unit of the additional stabilizer is made in the form of two plungers located above the pushers in the chambers that are made in the body and are hydraulically connected to the internal cavity, in addition, the pushers of the additional stabilizer are equipped with stops that are placed in pockets filled in its housing in the form of radially directionally A-shaped located prisms, the side edges of which are parallel to the end plane of the body and symmetrical with respect to the eccentricity plane, and the balls of the additional stabilizer are placed in pockets with the possibility of radial movements. LL B b FIG. 2 12 nineteen Yr Fig 5 Fig.Z Fy ll eight 27 HER 1 Ipsidine® plane eight FIG. 8 F Butjh FIA Axis stdola skdazhin /