RU2468916C1 - Mandrel for making shell of composite material on casing with precut opening - Google Patents

Abstract

FIELD: process engineering.

SUBSTANCE: invention relates to winding shells of composite material on casing with precut opening to be fitted in flow string of multihole wells. Proposed mandrel comprises forming surface shaped to tube opening and connected with two or more bearing rod mechanisms. Said forming surface may be fitted and locked in tube opening while bearing rod mechanisms may be fitted against the stop in tune wall opposite said opening. Note here that rod mechanisms are connected with said forming surface to deflect from perpendicular in one direction only while bearing rod may be locked relative to tube axis with surface and rod in operating position.

EFFECT: shell of composite material with precut opening.

6 dwg

Description

The invention relates to the manufacture of products from composite materials by winding, in particular, on a casing with a “window” pre-cut in it, intended for installation in a production string during the construction of multilateral wells.

Known "Collapsible mandrel for the manufacture of high-strength shells from composite materials" (patent RU No. 2147003 C1, IPC 7 E29C 53/82, B29D 22/00, publ. Bull. No. 9 from 03/27/2000), containing a Central shaft and installed around it, segmented elements joined together by inclined lateral faces, forming the working surface of the mandrel with external profiled surfaces, lined with a coating of elastic material such as rubber, fixed with rings made with external landing surfaces with possible the ability to install and fix on one of them a flange of small diameter, on the other ring from the side of the shaft extraction there is a sleeve with an outer seating surface and an annular protrusion to base the flange of a larger diameter with the possibility of fixing it at the end in a predetermined position by axially arranged screw stops placed on the disk mounted on the free end of the shaft, and a ring for securing segment elements, basing and fixing a small diameter and a sleeve for basing and fixing a flange of a larger diameter with they are fitted with profiled annular protrusions made at their ends from the side of the segmental elements, forming, together with the segmental elements and flanges, annular cavities for shaping on the coating of elastic material corresponding to their profile cuffs with protruding annular edges.

The disadvantage of this mandrel is the inability to use it to form a shell on the casing with a “window” pre-cut in it.

The closest technical solution is the "Mandrel for the manufacture of pipes from composite materials" (AS SU No. 1669748 A1, IPC B29C 53/82; B29K 105/08; B29L 23/00, publ. Bull. No. 30 from 08/15/91 g) containing the supporting element and the forming element mounted on it.

The disadvantage of this mandrel is the inability to use it to form a shell on the casing with a “window” pre-cut in it.

The technical task of the invention is the creation of a mandrel design that allows you to form a sheath of composite materials on the casing with a “window” pre-cut in it.

The technical problem is solved by a mandrel for forming a shell of composite materials on the casing with a “window” pre-cut in it, containing a supporting rod and a forming surface mounted on it.

What is new is that the forming surface is made to fit the pipe “window” and is connected by two or more connecting rod mechanisms to the supporting rod, and the forming surface is made to be installed and fixed in the working position in the pipe “window”, and the connecting rod mechanisms are supported from the inside into the pipe wall opposite the “window”, while the connecting rod mechanisms are connected to the forming surface with the possibility of deviation from the perpendicular only in one direction, and the supporting rod is made with the possibility of fixing rel respect to the tube axis when installing the forming surface and connecting rod mechanism in the operative position.

Figure 1 shows the mandrel at the time of installation in the casing with a pre-cut in it "window" (section).

Figure 2 shows a section aa in figure 1 (section).

Figure 3 shows a view of B in figure 1.

Figure 4 shows a view In figure 1.

Figure 5 shows the mandrel installed in the casing with a “window” pre-cut in it, and a shell made of composite material formed on the casing (section).

In Fig.6 shows a section GG in Fig.6 (section).

The mandrel for forming a sheath of composite materials on the casing with a “window” pre-cut in it contains a forming surface 1 (Fig. 1), made to fit the “window” 2 of the casing 3 and connected by connecting rod mechanisms 4 to the supporting rod 5. The forming surface 1 (FIGS. 5, 6) is configured to be installed in the “window” 2 in the working position and fixed in it by means of the stop of segments 6 (FIGS. 1, 2, 3, 4, 5, 6), rigidly connected to the forming surface 1 into the inner part of the casing 3 (Figs. 5, 6), and the supporting rye 5 is made with the possibility of abutment from the inside to the opposite "window" 2 wall of the casing 3. In this case, the connecting rod mechanisms 4 (Fig. 1) are connected to the forming surface 1 with the possibility of deviation from the perpendicular only one way due to the stop of the connecting rod mechanisms segments 6. The bearing rod 5 (figure 5) is made with the possibility of fixing relative to the axis of the pipe 3 using, for example, a disk 7 when installing the forming surface 1 and the connecting rod mechanisms 4 in the working position.

The mandrel for forming a sheath of composite materials on the casing with a “window” previously cut in it works as follows.

The forming surface 1 (Fig. 1) using the connecting rod mechanisms 4 is deflected from the perpendicular and inserted into the casing 3 so that it is opposite the “window” 2 cut in the pipe 3. Then, for example, craft- paper (not shown) to prevent sticking of the composite material on the forming surface 1, screw eyebolts (not shown) into it. A beam crane (not shown) is hooked onto the eyebolts and the forming surface 1 is lifted (FIG. 5). The connecting rod mechanisms 4 rise perpendicular to the pipe and the forming surface 1 enters the “window” 2 and closes it. In this case, the segments 6 (Figs. 5, 6) abut against the inner part of the casing 3 at the edges of the “window” 2 and fix the forming surface 1 from the outside of the “window” 2, and the connecting rod mechanisms 4 abut against the opposite wall of the pipe 3. B the end face of the pipe 3 (figure 5) install the disk 7 and fix the supporting rod 5, for example with a nut. Unscrew the eyebolts. After this, a shell is formed, for example, of fiberglass and the polymerization process is carried out. Then remove the mandrel in the reverse order and test the product.

The advantage of the proposed mandrel is that its design allows you to form a shell of composite materials on the casing with a “window” pre-cut in it.

Claims (1)

A mandrel for forming a sheath of composite materials on the casing with a “window” pre-cut in it, containing a supporting rod and a shaping surface mounted on it, characterized in that the shaping surface is made to fit the “window” of the pipe and is connected by two or more connecting rod mechanisms bearing rod, moreover, the forming surface is made with the possibility of installation and fixing in the working position in the "window" of the pipe, and the connecting rod mechanisms - stops from the inside into the opposite "window" of the wall tr loss, while the connecting rod mechanisms are connected to the forming surface with the possibility of deviation from the perpendicular only in one direction, and the supporting rod is made with the possibility of fixing relative to the axis of the pipe when installing the forming surface and connecting rod mechanisms in the working position.

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