RU2376444C1 - Process system for tubing string repair - Google Patents

Abstract

FIELD: oil-and-gas production.

SUBSTANCE: invention related to oil-and-gas production can be used for tubing sting manufacture and repair. Process system for tubing string repair includes heating department, internal surface of repaired tubing string shot blasting department, linering preparation department, repaired tubing pipe and liner aligning department, linering department with lubricant use, washing out lubricant and drying department, linered pipe ends cutting and threading department, external surface of repaired tubing string shot blasting department, pipe internal surface coating department, heating of pipe internal coating hardening department, collar connection department. At linered pipe ends cutting and threading department also located department of liner ends welding to repairing tubing pipe ends and ends cleaning after welding. Linering preparation department equipped with department of liner coating with water proof material. Linered pipe heating department located after washing out lubricant and drying department or combined with heating of pipe internal coating hardening department. Area between departments equipped with intermediate storages, quality control departments, departments of preparation for the next process, loading-unloading mechanisms and transportation mechanisms.

EFFECT: increase in efficiency and repair quality of used tubing strings.

4 cl, 1 dwg

Description

The invention relates to the oil industry and may find application in the manufacture and restoration of tubing.

A device for repairing pipes containing a compressible coating, which is transferred from a collapsed position to an expanded position in the pipe, a clamping mechanism and fixing a compressible coating, means for expanding a compressible coating together with a clamping and fixing mechanism, characterized in that the compressible coating is made in the form of a stocking , the clamping and fixing mechanism is made in the form of two sleeves, pressing and fixing the edges of the stocking in the pipe (Publication number 2004107423, publication date 2005.09.27).

The known device does not allow the creation of lined tubing.

Closest to the proposed invention in technical essence is a device for repairing pipes containing a clamping element, a mechanism for pressing the clamping element to the pipeline, a sealing gasket. The clamping element and the preload force mechanism are made in the form of a cylindrical shell with a diameter larger than the diameter of the pipe, provided with an insulating layer on the outside, an inlet pipe, and a gasket on the inside and lateral longitudinal ends (Publication number 92003465, publication date 1995.03.20 - prototype) .

The device allows repairing pipes from the outside and does not allow lining tubing.

The proposed invention solves the problem of repairing used tubing.

The problem is solved by a device for repairing a tubing, including a heating section, a shot blasting section of the inner surface of a tubing being repaired, a preparation section for lining, a section for combining a repairing tubing and a liner, a lining section using grease, a lubrication washing section and drying, a section for trimming the ends of the lined pipe and threading, a section for shot blasting of the inner surface of the pipe, a plot for applying mater yala for the inner coating of the pipe, a heating section for curing the material of the internal coating, a clutch friction section, a finished product warehouse.

Inside the section for trimming the ends of the lined pipe and threading, a section for welding the ends of the liner and the repair tubing along the ends and trimming the ends after welding can be placed.

The device may further comprise a heating section of the lined pipe with sealing material located after the washing section from lubrication and drying, or this heating section may be combined with the heating section of the coating material on the inner surface of the lined pipe.

The device between the sections can be equipped with intermediate warehouses, sections of quality control, sections of preparation for work in the next section and loading and unloading mechanisms and moving mechanisms.

SUMMARY OF THE INVENTION

Tubing during operation are subjected to complex stress-strain loading, amplified by active corrosion and erosion processes, under the influence of which various defects occur on the outer and inner surfaces of the pipes. Under normal conditions, pipes will be decommissioned when they are worn out. This leads to the loss of a huge number of pipes and material costs for the purchase of new pipes. The proposed invention solves the problem of repair of tubing, which allows you to return to production a significant volume of pipes and prevent unjustified costs for the acquisition of new pipes.

The problem is solved as follows.

The repair tubing is reinforced by introducing a thin-walled metal pipe into the liner. Lane, i.e. increase the diameter of the liner until it is in firm contact with the repaired tubing. Lined pipes work as a unit. The inside of the lined pipe is coated with a polymer coating.

The drawing shows a diagram of a device for repair of tubing.

A device for repairing a tubing includes a heating section 1, a shot blasting section of the inner surface of a tubing being repaired 2, a preparation site for lining 3, a section for combining a repairing tubing and a liner 4, a lining section using grease 5, a washing section from lubrication and drying 6, the section of trimming the ends of the lined pipe and threading 7, the area of shot blasting of the inner surface of the pipe 8, the area of application of the material is covered Iya on the inner surface of the pipe 9, the heating section of the coating material on the inner surface of the pipe 10, the plot of the collar of the coupling 11, the finished product warehouse 12.

Inside the section for trimming the ends of the lined pipe and threading 7, a section for welding the ends of the liner and the repair tubing along the ends and trimming the ends after welding 13 can be placed (shown with a dotted line as possible).

The device may further comprise a heating section of the lined pipe 14 with sealant (shown as a dotted line as possible) after the washing section from lubrication and drying 6, or the heating section 14 may be combined with the heating section of the coating material on the inner surface of the pipe 10.

The device between the sections can be equipped with intermediate warehouses, sections of quality control, sections of preparation for work on the next section and loading and unloading mechanisms and moving mechanisms (not shown).

A device for repair of a tubing works as follows.

At site 1, heat treatment is carried out in the furnace of the repair tubing, for example, at a temperature of 350-400 ° C with an exposure at this temperature for at least 8 hours. In this case, all deposits on the inner surface of the pipes, i.e. are transferred to a state in which shot blasting will be able to destroy all deposits. After heat treatment, the pipes are cooled in air.

In section 2, shot blasting of the inner surface of the repaired tubing is carried out until all deposits are removed.

At section 3, they prepare for lining. Here, measures are taken to combine and interlock the liner and the repair tubing. For example, at the ends of the liner and the tubing being repaired, sockets are made, the surfaces of which must fit snugly together. The sockets can be made either by inserting a mandrel of the appropriate shape into the pipes, or by rollers during rotation of the pipes.

It is possible in this section to place a plot for applying a sealing material on the entire outer surface of the liner or its part for subsequent filling with sealing material the entire gap between the liner and the tubing being repaired or part of the gap, for example, at the ends of the pipe.

At the site 4 combining the repaired tubing and the liner, the liner is introduced into the repaired tubing.

The introduction of the liner into the repaired tubing can be carried out according to the following schemes:

- pushing the liner into the repaired tubing. In this case, it is necessary to take into account the limitations of the longitudinal stability of the liner;

- pulling the liner through the repaired tubing, applying force to the front (along the pulling) end of the liner;

- pushing the tubing under repair onto the liner, taking into account the longitudinal stability of the liner.

The most preferred combination is pulling the liner through the repaired tubing.

At section 5, lining is performed. A pulling rod with a mandrel is introduced into the liner after combining it with the repaired tubing. The mandrel must be inserted into the liner until it is firmly mated with the bell of the liner. The pulling carriage of the drawing mill captures the pulling rod and pulls the pulling rod with the mandrel through the liner with its force, increasing its diameter so that the annular gap is fully selected, and the outer diameter of the tubing being repaired increases by 0.3-0.5 % of the original size. This degree of deformation is sufficient for maximum stresses to arise in its wall in the elastic zone of the metal, the ultimate value of which is the yield strength. Lanening is performed using grease between the mandrel and the liner.

It is possible to combine and jointly deform the repaired tubing and the liner in the process of their joint drawing without making bells on the pipes, which can be done according to the following flow chart.

The repaired tubing is installed on the receiving table of the drawing mill with fixation by upper clamps equipped with elastic linings with a high coefficient of friction to metal. Previously, a pulling rope with grips on both sides is introduced into the repaired tubing. The front end of the liner in the cold state is shackled onto a “jug”. A mandrel is inserted into the liner, the “nose” of which is exposed from the “jug” for capture by a pulling rope. The gripping devices of the pulling rope are connected to the mandrel (on the one hand) and to the pulling carriage of the drawing mill (on the other hand). By moving the pulling trolley (alternatively, by rotating the drum with the drive), the liner is pulled into the repaired tubing so that the spout of the liner along with the mandrel emerges from the repaired tubing. The return movement of the rope attached to the shank of the mandrel, it is removed from the liner. Instead, a deforming mandrel is connected to the pulling rope, the pulling of which ensures the joint deformation of the liner and the repair tubing.

The fastening of the repaired tubing and the liner during the joint drawing process is ensured by the flanging of the liner, which abuts against the rear end of the repaired tubing.

After lining, the pipes are transferred to section 6, where they are immersed in a bath with a solution of detergent and a washing is performed from the lubricant used in lining. After washing, the pipes are dried, for example, by blowing air.

Then the pipes are transferred to section 7, where on a numerically controlled machine tool, trimming the ends of the lined pipe and cutting the external thread from both ends of the pipe are performed.

To increase the tightness and strength of the lined tubing inside the section for trimming the ends of the lined tubing and threading 7, there may be a section for welding the ends of the liner and the tubing being repaired 13, where the liner and the tubing being repaired are welded and the ends of the pipe are cleaned after welding. Welding is performed after trimming the ends of the pipe (before threading).

The pipes are fed to section 8, where the inner surface is shot blasted to roughen the inner surface of the liner, which contributes to increased adhesion of the future internal polymer coating. At section 9, the coating material is applied to the inner surface of the lined pipe. In section 10, pipes are heated in the furnace to cure the material of the inner coating. After heating, the pipes are cooled in air.

After cooling, the pipes are fed to section 11, where they produce a clutch on the threaded thread. At the ends of the pipes, plugs are installed and sent to the finished goods warehouse 12.

If there is a sealing material between the liner and the tubing being repaired, the device may further comprise a heating section 14 of the lined pipe, in which the furnace is heated and the sealing material is cured. Section 14 can be placed after the washing section from lubrication and drying 6. The heating functions of the sealing material and the heating of the inner polymer coating can be combined in one section 10.

Between sections, there may be intermediate warehouses, quality control sections, sections for preparation for work at the next section, and loading and unloading and moving mechanisms.

As a result, it is possible to solve the problem of repair of tubing.

The application of the proposed device will allow repairing used tubing and, thereby, extend their service life.

Claims (4)

1. Technological complex for repair of tubing, including technological sections connected to each other in a single technological process, characterized in that it includes a heat treatment section in the furnace of the tubing being repaired, a shot blasting section of the inner surface of the tubing being repaired for removal of all deposits, preparation site for lining, site for combining a repair tubing and a liner, lining section using strokes, grease and drying wash section, trimming the ends of the lined pipe and threading, the shot blasting section of the inner surface of the pipe to roughen the inner surface of the liner, the coating area of the coating on the inner surface of the lined pipe, the heating section for curing the coating material , plot clutch bells and whistles. 2. The technological complex according to claim 1, characterized in that the preparation site for lining includes a deposition site of a sealing material on the liner, and the complex further comprises a heating section of the lined pipe for curing the sealing material, located after the washing section from lubrication and drying, or a heating section for curing the sealing material is combined with the heating section for curing the material of the inner coating. 3. The technological complex according to claim 1, characterized in that inside the section for trimming the ends of the lined pipe and threading is placed the section for welding the ends of the liner and the repair tubing along the ends and trimming the ends after welding. 4. The technological complex according to claim 1, or 2, or 3, characterized in that between the sections there are intermediate warehouses, quality control sections, preparation sites for work in the next section and loading and unloading mechanisms and moving mechanisms.

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