RU2771272C1 - Apparatus for protecting and securing cable on pipes - Google Patents

Abstract

FIELD: engineering.

SUBSTANCE: invention relates to apparatuses for securing and protecting cable power lines of submersible electric engines, protectoliners. The apparatus for protecting and securing cable on a pipe comprises a bar connected with the body provided with a cable slot by means of collars with a protrusion, arranged along the edges of the side walls of the body, one end whereof is hingedly secured on the side wall of the body and the other is hingedly connected with said bar. The bar includes connecting loops with protrusions, coupled with the matching part of the body. The other end of the bar comprises grooves with retaining protrusions for installing a nut. The clamps are made with recesses corresponding to said matching protrusions on the coupled parts, and the slot, bar and clamps are made with endwise narrowings from 10° to 30°.

EFFECT: reduction in the outer dimension of the protectoliner and increase in the fitting of the layout into a curved wellbore, into boreholes with a reduced through diameter, and into liners, as well as increase in the reliability of the apparatus for protecting elements of the apparatus from damage.

1 cl, 13 dwg

Description

The invention relates to devices (protector and protectoliner) for fastening and protecting cable power lines used as drives for centrifugal pumps for the extraction of oil and other reservoir fluids from wells, control lines for various downhole tools, signal cables, pipelines for pumping liquid or steam or chemicals reagents, fiber-optic lines, umbilicals, and is intended for use in wells for protecting and fixing various cable lines in hidden columns (liners and so-called liners), as well as in wells with a reduced bore in the oil and gas industry.

With the depletion of hydrocarbon reserves near the earth's surface, the length of wells along the wellbore increases, well layouts equipped with hidden columns (liners) with a reduced bore diameter are widely used. Submersible equipment is becoming more complex, the number of downhole submersible equipment controlled by cable lines is increasing. All this leads to the fact that shock and vibration loads on cable line protection devices also increase, and reduced borehole diameters require a reduction in the outer dimensions of all types of protective devices and the use of protectoliners - protectors with a reduced size and a design adapted to the loads.

Devices (protectors and protectoliners) are wedge type US4615543A, on spring latches RU16012 U1 or US2417269 A and equipped with bolted connections WO1994011609 A1.

The present invention relates to bolted treads and protectoliners.

Typical devices for protecting and fastening cable lines to pipes used in wells, equipped with bolted connections, usually consist of three parts - one body and two clamps. The body and clamps are connected to each other on the one hand by means of a hinge, and on the other hand by means of a detachable bolted connection. Protectors are installed on the outer surface of the pipes so that the pipe sleeves are located inside the protector body, limiting the movement of the protector along the pipe, and the cable lines are placed in the slot of the protector body between the protector body and the sleeve, simultaneously protecting and holding one or more types of cable on the pipe surface. The protectors are attached to the pipe with clamps on opposite sides of the coupling using bolted connections. The bolt nuts are usually inserted from the outside and are located inside the protector body, and the bolt heads are in the protector collars (see patent US9512685 B2).

A device for attaching a power cable to tubing is known, containing a cast housing with a longitudinal groove for laying the power cable of the electric motor, windows for fixing the device on the lower and upper ends of the coupling, made at a height not less than the height of the coupling, and ties connecting the upper and lower parts of the housing, which are equipped with corresponding top and bottom covers, each of which is hinged and has a screw for fastening to the corresponding threaded hole of the upper and lower parts of the body, and the ratio of the height of the window and the width of the cover exceeds 2:1 (RF patent No. 2108439, IPC E21B 17/00, published 04/10/1998).

The disadvantage of this device is low reliability due to the possibility of destruction of the attachment points of covers and screws due to contact of the device elements with the walls and joints of the production pipes during tripping operations. The disadvantage of the device is also a large cross-section, which leads to obstruction in the well during tripping operations, reduces the free section of the well and makes it difficult to flow downhole fluid.

Also known is a protector intended for use in downhole pumping rod installations when extracting oil from a well with a significant curvature of the wellbore, consisting of a body made of two parts with internal diametrically opposite grooves on one side of each part of the body, while the parts of the body are installed with a gap and the possibility of radial movement one relative to the other, and on the other sides of each of the body parts, shanks are made, which are placed in the grooves of the body (RF patent 2026952, IPC E21B 17/00, published on 01/20/1995).

The disadvantages of the known protector are the large size, which does not allow the assembly of pipes with cables to pass through curved sections of the wellbore with a high intensity of curvature, which leads to tightening and sticking of the tool in the well.

Closest to the patent-pending solution is a device for protecting and fastening cables to pipes. It is applied to various pipes, including such as liners - secret columns, liners. The device for protecting and fastening the cable to the pipes consists of 3 parts, a body and 2 clamping levers, (US application No. 2018/0355679 A1, IPC E21B 17/10, published on 12/13/2018).

A disadvantage of the known device is the low reliability of the design during operation due to the fact that the clamping levers that are closed to the body are not connected to each other, but are separate parts of other clamping levers or the body, and the large size due to the external location of the nut in the body and increased the gap between the bolted connection and the pipe, which also increases the likelihood of getting stuck in the well and equipment failure, and also makes it difficult for the well fluid to flow.

The technical result of the invention is to reduce the outer dimension of the protectoliner and increase the fit of the assembly (protectoliner mounted on a pipe with cable lines) into a deviated wellbore, into wells with a reduced bore diameter and into liners, as well as increase the reliability of the device to protect against damage to the device elements.

The technical result is achieved by the proposed device for protecting and fastening the cable to the pipe (protectoliner), which contains a bar connected to the housing having a slot for the cable by means of collars with a ledge located at the edges of the side walls of the housing, one end of which is hinged to the side wall of the housing , and the other end is pivotally connected to the specified bar, while the bar includes connecting loops with protrusions that fit with the mating part of the body, and the other end of the bar contains grooves with retaining protrusions for installing the nut, while the clamps are made with recesses corresponding to the specified reciprocal protrusions on mating parts.

Reducing the outer diameter of the protectoliner and, as a result, the fit of the assembly into a deviated wellbore is achieved due to the reduced size of the protectoliner. The decrease in the size of the protectoliner is achieved, in turn, due to the fact that the bolted connections are hidden in the bar and in such a way that the gap between the nuts of the threaded connections and the pipe on which the protectoliner is put on is minimal or completely absent.

On two opposite sides of the bar, grooves with protrusions holding the nut can be made. The slot, strap and clamps are made with end constrictions directed to the pipe surface at an angle of 10° to 30° relative to the pipe axis to reduce shock loads during the passage of ledges inside the well.

Further, the patented solution is illustrated by figures, which show the following:

figure 1 - General view of the protectoliner;

in figures 2 and 3 - a view of the open device with a union nut, when the bolts are fixed in the body, and the nut is thrown into the bar when closing;

in figures 8 and 9 - a view of the opened device with cap bolts, when the nut is fixed in the bar, and the bolts are thrown into the body when closing;

in figures 4 and 10, a view of a device put on a pipe with a loose housing with a slot;

in figures 5, 6, 11, 12 - protectoliner assembly on a pipe with a cable;

in figures 7 and 13, the minimum clearance between the bolted nut and the pipe.

The device for protecting and fastening the cable 12 to the pipes includes a bar 1, two clamps 3, a body 2 with a slot for the cable. The strap 1 with the body 2 are connected by means of a union threaded connections 4 containing a bolt 14 and nuts 15 or 16 (figures 2 and 8).

Threaded connection 4 is made either as in option 1:

1. The bolts 14 are threaded into the holes in the housing 2, which contains a slot for the cable, and are secured against falling out with nuts 16 (figures 2 and 3). Nuts 16 when putting the device on the pipe 10 with the coupling 11 are thrown into the grooves 7 specially provided for them in the bar, (figures 2, 4 and 5). In this case, the nuts 16 are installed in such a way that they are combined with the mating part of the bar 1 (figures 2 and 7)

Or as per option 2:

2. Round nuts 15 (type burrel nut) are inserted into the grooves 7 in the bar 1 from the inside and secured against falling out with bolts 14 (figures 8 and 9). The bolts 14, when putting the device on the pipe 10 with the coupling 11, are thrown into the specially designated places (recesses) 17 in the housing 2 (figures 8, 10, 11).

The end narrowing 5 of the body 2, straps 1 and clamps 3 is made with an angle equal to 10-30°, which is sufficient to enter the liner (figures 8 and 11). Due to the implementation of the end constriction 5 with an angle of 10° to 30° relative to the axis of the body pipe 2 with a slot, strips 1 and clamps 3 in the range from 10° to 30°, the engagement of the device during tripping operations in the well is excluded, which increases the reliability of the design .

To protect against erosion (exclusion of damage) of threaded connections 4, which occurs due to the high flow rate due to the small space of the annular gap, the interface of the strap 1 and the mating part of the housing 2 with a cable slot is made with a protrusion 6 at an angle of 30° to 90° from the axis of the body to prevent the passage of flow through the body of the bolts 14 (figures 2, 5, 8 and 11). The protrusion 6 closes the body of the bolts from the ends of the device. The plank forms an additional connection between the tool joints, which eliminates the rupture of the protectoliner in the well due to jamming.

Clamps 3 are placed along the edges of the housing 2 with a slot, and one end of the clamps 3 is hinged on the side wall of the housing 2 by means of hinged loops 8, and the other end of the clamps 3 is also connected to the bar 1 by means of hinged loops 8, while the loops 8 have a continuation in the form protrusion 9 (figures 3, 5, 6, 9, 11, 12), which comes on the pipe and increases the reliability of the entire structure due to additional rigidity, because with the help of it, the bar 1 and the clamps 3 form an additional cross connection between themselves and prevent the device from falling off the pipe in the following way.

During installation, the protectoliner is put on the pipe 10 due to the coverage of the strap 1 and the clamps 3 on top and bottom of the coupling 11 of the pipe 10, when closed, a wrap angle 13 of more than 200 degrees is formed on the pipe 10 (figures 4,10), which prevents the device from falling off the pipe arbitrarily . In this case, the bar 1 cannot spontaneously open due to the protrusion 9 on the clamps 3. Thus, the device is securely fixed on the pipe. After that, you can fill the cable 12 into the protective slot of the housing 2 and fasten the device by pressing the slot of the housing 2 to the pipe 10 with the cable 12 and throwing the threaded connections 4 into the grooves 7 located in the bar 1 (figures 2 and 4) or into the recesses 17 located in case 2 with a slot (figures 8 and 10).

To reduce the outer diameter and size of the protectoliner, a groove 7 is made in the plank, in which a nut 15 or 16 is located (figures 2 and 8).

The placement of the nut 15 or 16 in the bar 1 allows you to reduce the overall overall diameter of the device, making the gap between the fastening of the threaded connection 4 with the nut 15 or 16 and the pipe 10 on which the protectoliner is installed (figures 7 and 13) minimal. The threaded connection 4 fits snugly to the pipe 10 due to the minimum distance between the nut 15 or 16 and the pipe 10 (figures 7 and 13), which increases the reliability of the design.

Installing the nut 15 or 16 inside the strap 1 gives a smooth surface on the outside (Fig. 1), which eliminates the engagement of the device during tripping operations in the well, i.e. increases the reliability of the design.

Claims (1)

A device for protecting and fastening a cable to a pipe, characterized in that it contains a bar connected to the housing having a slot for the cable by means of collars with a ledge located along the edges of the side walls of the housing, one end of which is hinged to the side wall of the housing, and the other is hinged is connected to the specified bar, while the bar includes connecting loops with protrusions that are joined with the mating part of the body, and the other end of the bar contains grooves with retaining protrusions for installing the nut, while the clamps are made with recesses corresponding to the specified mating protrusions on the mating parts, and the slot, strap and clamps are made with end narrowing from 10° to 30°.

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