UA20277U - Method for connecting the parts of a logging cable without increasing its diameter - Google Patents

Abstract

The proposed method for connecting the parts of a logging cable without increasing its diameter consists connecting the parts of the cable conductors,applying the layers of the inside and the outside sheaths of the cable, cramping the connection, and strengthening the connection area with fischerite.

Description

Description of the invention

The useful model refers to the means of geophysical research of wells and, in particular, to technology 2 of splicing and repairing armored logging cables.

There is a known method of splicing armored logging cables, in which, in order to increase the tensile strength of the welded joints of cable pieces between opposite ends of the armor wires, a wire insert is welded, selected for strength and profile in such a way that its tensile strength in the thin part is not greater than the tensile strength of the armor wires at the place of welding, and the permissible absolute elongation exceeds the absolute elongation of the wires 70 of the entire armor by at least the amount of elastic sliding of the welded joints under critical loads on the cable, while the inserts are placed so that the distance between adjacent inserts is equal to or greater than twice the length of the sections of the armor wires near places of welding.

This method is time-consuming and unreliable because the wires break at the welding point, especially when passing through the block-balance, and even more so through the sealing device of the lubricator unit |11. 12 The closest to the proposed known method of splicing cables, which consists in the preparation of the armor followed by the connection of the central core of the cable (CJK), the laying of internal and external windings of the armor, the connection areas of which are in different cross-sections. At the same time, the ends of the wires of the external winding are bent and laid under the neighboring wires, which leads to an increase in the diameter of the cable in such places by the thickness of the wire. At the same time, the tensile strength of the connection decreases and is approximately 70-7595 of the strength of the entire cable, that is, its load-carrying capacity decreases, which is unacceptable for geophysical cables.

Also, such a connection is unreliable and short-lived, due to the fact that the ends of the wires of the external winding become untangled, which creates a danger when working in wells under pressure using lubricator devices (21.

The task of this useful model is to improve the method of splicing geophysical cables without increasing the nominal diameter that the cable had before the break, by reducing the stresses in the splice zone of the cable while preserving its initial diameter and strength of the connection and ensuring the appropriate quality of insulation at the splice.

The problem is solved by the fact that in the method of splicing parts of geophysical cables without increasing the diameter, which consists in the preparation of the armor followed by the connection of the central core of the cable (CJK), the laying of internal and external windings of the armor, the connection areas of which are in different cross-sections, according to the invention - the connection is additionally strengthened with staples and stabilized with an adjustable fissure with a gradual reduction of the diameter to the nominal one. with

Strengthening with staples - ensures the reliability of fixing the ends of the wires in the diameter of the cable and an additional Ha») increase in the reliability of the connection. 3o Stabilization of the cable - allows you to preserve its nominal diameter. high school

The useful model is illustrated by drawings, where figure 1 shows a diagram of cable separation, figure 2 shows a diagram of the reverse covering of the connection of the central core of the cable, figure C shows an adjustable fisher for stabilizing the cable after connection, figure 4 shows view A of the figure 3, in figure 5 - view B in figure 3.

Figure 1 shows a geophysical cable consisting of 1 - the central core of the cable, 2 - insulation 50 of the central core of the cable, C - the internal armor of the cable, 4 - the external armor of the cable. The method is carried out as follows:

I" The initial separation of the cable (Fig. 1) from the side of the winch is carried out. Untangle the upper braid. It is divided into two equal parts if the number of wires is even, or with a difference of one wire if the number is odd. The length of the unwound twine is 20-25 m. The lower braid is unbraided in the same way. At the same time, the distance between the end of the separation of the outer and inner strands should be 20-50 cm. Having retreated 50-bOsm from the end of the separation of the lower braid, the CLC with insulation is removed. Completely clean 4 cm of insulation CZhK, and on av | 2 cm long, it tapers into a cone-like or cylindrical shape, as shown in figure 1.

Another part of the cable is separated (Fig. 1). The upper braid is unbraided in the same way as on a winch piece of cable for a length of 15-20 m. For a length of 50-60 cm, unbraid and remove the inner braid. On - and 20 A-hom, remove the cable insulation. The cable insulation is thinned by 2 cm.

We connect and isolate the LCD cable. The current-conducting core of the cable is loosened and then connected. t The connected core of the cable is wound with one wire of tinned or silver-plated mounting wire with a diameter of 0.2 mm. Winding is carried out with the smallest possible step. The beginning and end of the winding wire with a length of 4-5 mm are straightened and laid along the current-conducting cores of the cable, which prevents the possibility of a puncture in the further applied insulation. The current-conducting core is wrapped with foam, applying 2-3 layers, and then waterproof insulation (rubber, thin PVC isotape) is applied. At the same time, the increase in diameter should not exceed 0.5-0.mm. Next, the reverse coating of the connected and isolated CJK cable with an internal braid is carried out (Fig. 2). The inner armor is braided on the CJK freed from it and the place of connection of the CJK, overlapping them until the start of docking of the inner armor. When docking, the internal armor of the cable, located on the 60 side of the device, unravels. The division of the braid into two parts is carried out according to the calculation of the connection of the veins of the inner armor.

Docking is carried out sequentially of adjacent wires of the cable braid one to another. Each subsequent wire is connected through 7-10 turns of the braid. After the docking of the internal armor is completed, the outer armor is overlapped. The outer armor is woven into the inner one. The overlapping is carried out on the basis that the start of docking of the outer armor will be carried out 10-15 m after the end of the docking of the internal armor, which will prevent stretching of the connected parts of the cable.

The technology of connecting the outer braid is similar to the technology of connecting the inner. When removing the connecting wires of the armor, a distance of 1-2mm between them is allowed on the inner armor and 2-3mm on the outer. At the same time, the internal armor is not welded or fixed with staples. Next, the wires are fixed and the cable is stabilized. Fixation of the wires of the outer armor is carried out with the help of metal staples, which are made of sheet stainless steel with a thickness of 0.10-0.15 mm. To install the bracket, clamps are fixed on both sides at a distance of 8-10 cm from the place of installation. The cable is unwound and staples are inserted under the "weakened" armor, one at each end of the wire.

The stabilization of the cable is carried out with the help of an adjustable fisher (Fig. 3), which is installed on the cable and 7/0 is stretched along it with a gradual decrease in diameter, bringing it to the nominal value in the connection area.

References: 1. Author's certificate of the USSR Mo525040, С0О1М 13/00. 2. Horbunko L.A. Logging cables and their exploitation M., "Nedra", 1978, p. 142-143 (prototype).

Claims (1)

19 Formulas of the invention The method of splicing parts of geophysical cables without increasing the diameter, which consists in the preparation of the armor followed by the connection of the central core of the cable, the laying of the inner and outer windings of the armor, the connection areas of which are in different cross-sections, which is distinguished by the fact that the joint is additionally strengthened with staples and stabilized with an adjustable fastener with a gradual decrease in diameter to the nominal one. what with yich- s "c) s - i" name) ("c) name) -and what 60 b5