RU92688U1 - RESTRICTING RING WITH LOCKING WEDGE FOR EQUIPPING A CASE - Google Patents

Abstract

A restrictive ring with a retaining wedge for rigging the casing, made with an internal groove and radial windows for introducing into the groove a retaining flat one-sided wedge, on an inclined surface of which in the longitudinal direction there are fixing ribs in the form of grooves and protrusions having a triangular cross-section, characterized in that the width of the retaining ring is selected from a calculation of at least 50 mm, and the grooves for placing the retaining wedges in opposite directions are made on both sides of the windows in shape and Line wedge eccentric machining, with windows for entering the locking wedges are made at different levels on the same side.

Description

The invention relates to the oil industry, and in particular to devices for securing technological equipment on a pipe string, lowered into the well.

A known locking element for securing centralizers to the casing string (see the governing document of Tatneft, RD 39-0147585-152-97, effective from 01.01.98), which is a bolt with a pointed end, screwed into the hole with threaded thread in the locking sleeve or sleeve part, lowered into the equipment well.

Also known is a locking device for downhole equipment, lowered on a pipe string (see the same source RD 39-0147585-152-97 of JSC Tatneft), containing a sleeve in the form of a ring with an inner ring groove and radial holes for entering into the said groove, after installing the ring on the pipe of the column of the twisted locking element with fixing ribs made on it. This device is in technical essence closer to the proposed one and can be adopted as a prototype.

A common drawback of the above analogs is the insufficient reliability of fixing technological equipment, since the fixing ribs have a limited mating surface with the body of the column pipe, as a result of which, in practice, there are cases of sliding from the installation site of the fixing equipment during the descent of the pipe string into the well.

Also known is a locking device for downhole equipment, lowered on a pipe string (see RF patent No. 2190079, IPC 7 ЕВВ 19/00, 17/10, publ. BI No. 27, 09/27/2002), containing a restrictive ring with an internal groove and radial windows for introducing into the groove a locking flat one-sided wedge, on an inclined surface of which in the longitudinal direction there are fixing ribs in the form of grooves and protrusions having a triangular cross-section.

The known device in technical essence is closer to the proposed one and can be adopted as a prototype. In it, the shortcomings of analogues are partially eliminated, however, and it is not without drawbacks. So, as shown by many years of experience using a restrictive ring with a retaining element in the Tatarstan oil field, there are cases of displacement from the installation site of casing rigs equipped with restriction rings, due to insufficient reliability of fixing both the restriction ring to the casing pipes and the rigs themselves, in particular, centralizers, turbulators of deflectors, etc. This is explained by the fact that when passing problematic sections of the wellbore, such as ledges, gutters, large anti-aircraft goal when running casing in the well to load fastening system of the dam ring and snap the casing is significantly larger than the calculated effort breakaway standard centralizers and restrictive bands and other snap-ins with reserved seats.

The technical task of this utility model is to increase the resistance of the fixed casing rigs to the pulling force from the place of their fastening, therefore, to increase the reliability of fixing the casing rigs.

The stated technical problem is solved by the described restrictive ring with a locking wedge for casing rigs, made with an internal groove and radial windows for introducing into the groove a locking flat one-sided wedge, on an inclined surface of which in the longitudinal direction there are fixing ribs in the form of grooves and protrusions having a cross section triangular shape.

What is new is that the width of the retaining ring is chosen at least 50 mm, and the grooves for placing the retaining wedges in opposite directions are made on both sides of the windows by the shape and length of the wedge by eccentric machining, while the windows for introducing the retaining wedges are made at different levels on the same side.

The above figures explain the essence of the presented utility model, where in Fig. 1 a restrictive ring with radial windows and with internal grooves is shown. Figure 2 - locking wedge, view from the side. Figure 3 is a top view of the inclined surface of the retaining wedge, where the fixing ribs are visible, view along arrow A. Figure 4 is a restrictive ring mounted on the casing pipe above a rigid centralizer to increase the degree of resistance of the latter to the pulling force from the place of its installation . Figure 5 - one of the fragments of the fixing of the restrictive ring to the casing pipe with stop wedges passed through one of the windows.

In the restrictive ring 1 (see FIG. 1), at least 50 mm wide selected from the calculation, internal grooves 2, 3 and 4 and 5 (see FIGS. 1 and 5) are made, located on both sides in opposite directions from the windows 6 and 7, respectively, for driving through them into the grooves of the locking wedge 8 mentioned above (see FIG. 2). The latter is made flat and one-sided. On its inclined surface 9 (see FIGS. 2 and 3), fixing ribs 10 are made in the longitudinal direction in the form of grooves and protrusions having a triangular shape in cross section. The grooves 2, 3 and 4, 5 are made in the shape and length of the locking wedge by eccentric machining, while the windows 6 and 7 are made at different levels on the same side (see figures 1 and 4).

It is installed in the most critical places of the well section, for example, in the zone of the productive formation in order to prevent the displacement of the casing rig from the place of their installation. To do this, first, a restrictive ring is put on the casing string 11 to be expanded and fixed with retaining wedges in the following sequence. Through the windows 6 and 7, communicating the outer space with grooves 2 and 3. or 4 and 5, enter the sharp end of the retaining wedge 8, directing its inclined plane with locking ribs 10 to the surface of the pipe 11 (see figure 5). Then, by striking the hammer, the wedges are advanced until they are completely drowned in the grooves 2 and 3 in opposite directions (see FIG. 5). In this case, the fixing ribs and the wedge itself as they move in the forward direction, bending along the groove, cover the outer surface of the pipe and crashing into its body, as shown in Fig. 5. Similarly, fix the restrictive ring with wedges passed through another window 7.

Then, the centralizer 12 is pulled onto the same pipe (see FIG. 4), setting it close to the restrictive ring and securing it with retaining wedges as described above.

Due to the fact that the fixing of the restrictive ring by locking wedges at different levels and on the same side provides increased reliability of fastening and withstands large stragging forces, which will prevent displacement of casing rigs from the installation site, therefore, will ensure their accurate installation in the required interval.

Claims (1)

A restrictive ring with a locking wedge for rigging the casing, made with an internal groove and radial windows for introducing into the groove a locking flat one-sided wedge, on an inclined surface of which in the longitudinal direction there are fixing ribs in the form of grooves and protrusions having a triangular cross-section, characterized in that the width of the retaining ring is selected from a calculation of at least 50 mm, and the grooves for placing the retaining wedges in opposite directions are made on both sides of the windows in shape and Line wedge eccentric machining, with windows for entering the locking wedges are made at different levels on the same side.