SU1463356A1 - Method of cleaning the inner surface of tube from hard deposits - Google Patents

Abstract

The invention relates to methods for cleaning the surface of pipes from solid deposits, for example, in the oil industry from salt deposits, and provides for an increase in the quality of cleaning, a reduction in the energy intensity of the process and the prevention of pipe destruction. The method consists in acting on the pipe wall with a shock wave by initiating detonating cords, which are arranged along the forming pipe with a uniform step along its diameter in the form of groups of at least two detonating cords tightly adjacent to each other, all of which have the same length at the same time. 2 Il. i (L

Description

 one

 The invention relates to. methods of cleaning surfaces from solid deposits and can be used, for example, in the oil industry, when cleaning salts from salts and solid asphalt-resin-paraffin deposits of pump-compressor pipes, extracted from production and natural wells, pipelines for field communications and oil pipelines for pipe fittings, boiler tubes for scale, as well as pipes and other equipment for transporting chemicals from scaling.

The aim of the invention is to improve the quality of cleaning, reduce the energy intensity of the process and prevent the destruction of the pipe.

FIG. 1 shows a flow chart of the method; in fig. 2 shows section A-A in FIG. one.

The diagram shows: 1 - cumulative jet from the explosion of a pair of detonates of cich cord, 2 - propagation of a shock wave in the air, distribution of the shock wave 3 and the reflected shock wave 4 in the pipe wall, propagation of the shock wave 5 and the reflected shock wave 6 in the layer of hard deposits, 7 is a pipe processed by the explosion, 8 are detonating cords, 9 is the detonation front, 10 are products of the explosion.

According to the proposed shock wave method, the cleaning process, for example pipes, is carried out as follows.

 The pipe to be cleaned is laid on a stand (support) made of a material that excludes a spark when struck, for example, an ejector. On the pipe surface, according to Isai, its length, along the axis, with uniform iftiiM angular pitch along the circumference of the hSeirtaraT cuts of the detonating cord. The ends of the segments lead out of the topua of the pipe, are connected into a harness and ini- 1) kiruk) T in this place with a caps-clamper,

As a result, an almost simultaneous impact of airborne, iioe impact on the entire surface of the pipe is ensured, and a high efficiency of cleaning its internal surface from solid sediments is achieved, even if they are of considerable thickness.

: With a large thickness of sediment and insufficient cord power, cords {are placed on the surface of the pipe | rupps with the same angular pitch r | 1 between them, and the number of cord 4 to the group is determined empirically, for example, by 2-4 cords in each j pynne,

Example. At the JfseHb field of the Mangyshlakneft p / o, itpy6 9 pump-compressor pumps with a diameter of 73 mm, a Wall thickness of 6 mm and a diameter of 9-g9.5 m were cleaned; 6 itpy6 - with deposits of mineral CO Ley with a thickness of 4-6 mm; 3 pipes - with 4 sfalto-resin-paraffin deposits (ARPD) 18 mm thick. The shock wave effect is produced using detonir ™ iijinjiro cord type DSLA and detonators type ED-83. Cords are laid on the surface of the pipe, along its axis in four groups (two cords each) with a uniform angular pitch between the groups.

The results are assessed by rtyTeM inspection of the surface of pipes and sediments, control of the completeness of entertainment and the amount of sediment extracted, as well as by skipping

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five

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five

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through the tube of a standard template with a diameter of 59 mm.

The test results showed the following.

The applied shock wave method with the selected mode (4 - 2 ganura each) ensures the complete removal of mineral salts with the fragmentation of a layer of sediment to fine piech-like particles that are freely poured out of the pipe. The inner surface of the pipe is clean, the template with a diameter of 59 mm runs freely along the entire length of the pipe.

When cleaning pipes from ARPD, they are completely peeled off from the inner surface of the pipe and divided into cylindrical core-shaped pieces of various lengths, which can be easily removed from the pipe.

No changes in the cross section geometry were detected on all 9 treated pipes.

It took an average of 15 minutes to perform a single operation to remove mineral salts or ARPD.

The proposed method can also be used to clean solid deposits of non-field equipment, which is a pipeline valve, from solid deposits.

Claims (1)

Invention Formula The method of cleaning the inner surface of the pipe from solid deposits by acting on the pipeline wall by a shock wave excited by an explosion by initiating detonating cords tightly pressed to the pipe wall along its direction, and the cords are evenly spaced along the pipe diameter, characterized in that cleaning, reducing the energy intensity of the process and preventing the pipe from collapsing, the cords are arranged in groups in the form of at least two detonating cords tightly adjacent to each other ditch of equal length, whose horses initiate simultaneously.