RU1806255C - Self-orienting articulated deflecting tool for directed drilling - Google Patents

Abstract

Usage: for artificial curvature of wells during directional or multi-face drilling, Summary of the invention: in a housing consisting of two parts, a hollow shaft with adapters is installed. Bearings are installed between the housing and adapters. The housing has a rigidly coupled eccentric load and a curvature assembly comprising a thrust sleeve with a beveled end installed in the lower part of the upper section of the housing. Before the device is lowered into the well, the thrust sleeve with a beveled end face is oriented and fixed relative to the apsidal plane of the well and fixed to the body. When the device is lowered, the eccentric load orientates the curvature unit and sets it into working position. When placing the device on the bottom and supplying washing liquid, the sections of the body and hinge elements move to the interaction of the adjacent ends of the sections of the body, due to which it is skewed. 2 s. P. f-ly, 2 ill. ate

Description

The invention relates to mining, in particular, to devices for artificially curving wells in directional and multi-face drilling, and can be used in downhole drilling and rotary drilling;

The purpose of the invention is to increase the reliability and efficiency of the diverter.

In FIG. 1 shows a longitudinal section through a deflector in the transport position, FIG. 2 - in working position.

The self-orientated articulated deflector for directional drilling includes a hollow shaft consisting of an upper 1 and a lower 2 parts connected by a hinge containing a spherical spline heel 3 located inside the spline sleeve 4, rigidly attached to the lower end of the upper 1 part of the shaft, connected to the shaft of the upper 5 and lower 6 adapters and a detachable housing located between them, containing the upper 7 and lower 8 sections, mounted with the possibility of mutual angular displacement, attached to the lower part of the upper 7 section of the thrust sleeve 9 with a beveled end 10, installed with the possibility of working in the interaction of the beveled end 10 with the upper end 11 of the lower 8 section, an eccentric load 12 rigidly connected to the upper 7 section and a sealed cavity 13 made in the opposite sector of this section, rigidly attached to the lower the end of the upper 1 and part of the shaft, the splined sleeve 4 is a support for suspension of the upper 7 section of the housing

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with a stop sleeve 9 attached to it, provided with a lock 14 for its position along the axis of the section 7 and the angular displacement with respect to the eccentric load 12. Inside the spline sleeve 4, in its smooth part, a sealing element-thrust bearing 15 is permanently closed with the fifth elastic 3 (for example, compression spring) element 16, which provides the possibility in the working position of the joint axial movement of the heel 3 and thrust bearing 15. Between the shaft, housing and adapters mounted radial 17 and thrust bearings 18, protected from clogging by sludge at by densifiers 19. Between the thrust bearing of the lower housing section 8 and the lower 6 adapter, a support 20 is formed in the form of a U-shaped longitudinal section of the disk. In the lower housing section 8, holes 21 are made to prevent the accumulation of sludge. The upper diverter 5 serves to connect drill pipes (for rotary drilling) or a downhole motor to it. A rock cutting tool is connected to the lower adapter 6 directly or through, for example, a core pipe, the length of which is selected depending on the predetermined curvature intensity of the well. Both adapters have the same outer diameter exceeding the diameter of the casing (Fig. 1, B-B), which prevents the casing from rubbing against the well walls at the time of orientation.

The rejector works as follows.

Before lowering it into the well, the thrust sleeve 9 is oriented and secured with a latch 14 relative to the apsidal plane of the well, i.e., to the eccentric load 12. After attaching the rock cutting tool and (depending on the drilling method) the downhole motor or the drill pipe itself, downhole. During the descent and before the deflector is placed on the bottom, the upper section 7 of the housing with the eccentric load 12 and the thrust sleeve 9, through the thrust bearing 18, is supported on the hinge sleeve 4. The lower part 2 of the hollow shaft with the lower section 8 of the housing, the adapter 6 and the rock cutting tool - through a spherical spline heel 3 is suspended in the inner ledge of the sleeve 4, while between the ends 10 and 11 of the upper 7 and lower 8 sections of the housing a clearance a is formed which is adjustable during assembly of the diverter. The eccentric load 12 occupies a lower position in the apsidal plane of the deviated well, and the beveled end 10 of the thrust sleeve 9 has a predetermined position relative to the apsidal plane. In this case, the occupation of the eccentric weight 12 of the lower position in the apsidal plane of the well is counteracted by friction forces that arise only between the upper 7

0 by the housing section through the bearings 17 and 18 and the upper part 1 of the shaft, and similar friction forces of the lower part of the deflector do not affect the self-orientation of the curving device.

5 The rigid connection of the eccentric load 12 with the upper section 7 of the body due to the increase in the radius of the load 12 increases the eccentricity and mass of the load 12 and, consequently, the moment of action of its mass. it

0 increases the reliability of orientation of the curving device, its efficiency and simplifies the design of the deflector. The more reliable and accurate orientation of the curvature device is also facilitated by the effect of increasing the mass of the eccentric load 12 by filling the cavity volume section of the upper section 7 of the housing opposite to it, not with washing liquid, but, for example, with air by

0 of this part of the hermetically sealed cavity 13. Thus, the presence of the hermetically sealed cavity 13 also increases the mass moment of the eccentric load 12 immersed in the flushing fluid and the reliability of the orientation of the curvature device. This increases the efficiency of the deflector by increasing the accuracy of orientation of the curvature power and reliability

0 holding it in its original position during the drilling of the well with the use of a diverter. When flushing fluid is supplied through drill pipes. and the hollow shaft of the deflector, due to the presence of a spring-loaded element - thrust bearing 15 and the hydrostatic pressure created by the flushing liquid on the upper end of the sealing element 15, the fluid outflow through the spline

0 sleeve 4 into the well is excluded, and it falls under the end of the rock cutting tool. At the same time, the hydrostatic pressure of the flushing fluid and

5, the pressure of the elastic element 16 of the throwing moment on the lower section 7 of the body and then on the rock cutting tool is not created.

At the time of setting the rock cutting tool at the bottom of the well under

Claims (3)

1. Self-orientated articulated diverter for directional drilling of wells, including a hollow shaft with a ball joint, upper and lower adapters connected to the shaft, a detachable housing located therebetween, comprising upper and lower sections mounted with the possibility of angular displacement, an eccentric load, a deflector distortion unit comprising a thrust sleeve with a beveled end face and bearings mounted between the shaft and the housing, characterized in that, in order to increase reliability and operational efficiency, an eccentric load is rigidly connected to the housing, the sleeve with the beveled end of the curvature assembly is connected to the lower part of the upper housing section and is installed to interact with the upper end of the lower housing section, the adjacent ends of the housing sections are installed relative to each other with a gap, and the fifth and the fifth bearings - with the possibility of axial movement and the center of the hinge in the working position in the place of the housing connector. 2. The diverter according to claim 1 is distinguished by the fact that it is equipped with a support installed between the thrust bearing of the lower section of the housing and the lower adapter and made in the form of a U-shaped in longitudinal section of the disk. 3. The rejector according to paragraphs. 1 and 2, characterized in that the housing on the side opposite to the eccentric load is made with a sealed cavity.