RU224964U1 - BI-DIRECTIONAL CLEANING PISTON FOR CLEANING THE INTERNAL CAVITY OF IN-FLOW OIL PIPELINES FROM ASPHALT RESIN AND DIRT-PARAFIN DEPOSITS - Google Patents

Abstract

The utility model relates to the field of pipeline transport in the oil and gas industry and can be used to clean the internal cavity of in-field oil pipelines from asphalt, resin and mud-paraffin deposits, as well as to prepare the pipeline for in-line diagnostics. The technical result achieved by the utility model is to expand the arsenal of technical means and create a series of cleaning pistons for various diameters of oil pipelines, capable of qualitatively preparing pipelines for in-line diagnostics with lower energy costs and financial investments. To achieve the technical result, a cleaning piston is proposed, containing a tubular steel body (3) with plugged ends, equipped with sealing elements and cleaning elements installed with the ability to cut off solid deposits on the inner surface of the pipeline. What is new is that the housing is made with guides (7), in which a sealing collar (10) is installed at one end of the housing, and three cleaning disks made of polyurethane (1) are installed at the other end; these elements are mounted using bolted connections on metal mounting disks (11) fixed to the body during assembly, with the two outer cleaning disks separated by spacers (6) and secured to one mounting disk (11). Between the specified cleaning disks (1) and the sealing collar (10) on the body in the guides (7), two blocks of knives (2) are installed and secured, designed to cut off solid deposits in a cross direction when the piston moves along the axis. The knife blocks (2) are made in the form of steel clips with knives (4) fixed in them using bolted connections (5) in the form of polyurethane plates, located around the circumference at an angle of 45° to the longitudinal axis of the piston, and the knives of one block are located in relation to to the knives of the second block at an angle of 90° and offset to bridge the gaps between the knives. 1 salary f-ly, 2 ill.

Description

The utility model relates to the field of pipeline transport in the oil and gas industry and can be used to clean the internal cavity of in-field oil pipelines from asphalt, resin and mud-paraffin deposits, as well as to prepare the pipeline for in-line diagnostics.

A prerequisite for creating a useful model is the relevance of cleaning the internal cavity of the pipeline, which plays an important role in its operation, since the productivity of the pipeline and the quality of the transported product depend on it, as well as carrying out high-quality in-line diagnostics. In this regard, at present, when preparing oil field pipelines for in-line diagnostics, a wide arsenal of well-known, including standard pig and piston-type cleaning equipment is repeatedly passed through for high-quality cleaning of the in-pipe space. At the same time, depending on the number of runs and the equipment used, the costs of both financial and labor resources increase.

It is known from the prior art, for example, a bidirectional disk cleaning piston containing a tubular body, plugged at both ends, equipped at the ends with blocks of disks, each of them pulled together into a package between a flange fixed to the body and a pressure ring, consisting of polyurethane or some other material. or other durable flexible elastomer disks: one guide or guides, with a diameter equal to or smaller by some amount than the internal diameter of the pipeline, one or more sealing ones with a diameter greater than the internal diameter of the pipeline for interference, and intermediate ones, remotely separating guides located closer to each other others to the ends of the body, and sealing disks (RF Patent No. 2177378 C1, priority date 05/03/2000, publication date 12/27/2001, authors: Fazletdinov K.A. et al., RU).

The disadvantage of the analogue is the energetically ineffective process of cleaning from solid paraffin deposits, since the discs, as they wear out, shift the deposits, accompanied by their smearing along the wall, rather than cutting them off. In this case, the shear forces will be significantly greater than the shearing forces, which is why significant energy costs and a large number of runs of the cleaning piston are required to achieve the required quality of cleaning the internal cavity of the pipeline.

A cleaning piston was adopted as a prototype, which cuts off solid paraffin deposits and ensures cleaning efficiency due to the bidirectional movement of the cleaning elements along the longitudinal axis of the pipeline and rotation around the axis. The piston contains a tubular body plugged at both ends, equipped with at least one block of sealing, cleaning and separating elements, pulled together into a package between a flange fixed to the body and a pressure ring. The cleaning element is made in the form of a disk with a holder, in the guides of which there are fangs intended for cutting, located in a circle and having an L-shaped pointed shape and a tooth on the edge of the fang made of duralumin, and the fangs are installed at an angle of 60° to the longitudinal axis of the piston and are made of polyurethane, and the sealing elements can be made in the form of disks or cuffs. When the piston moves, individual fangs, catching on deposits on the inner surface of the pipeline, cutting off these deposits, create a rotational moment, due to which the piston receives rotational movement around the longitudinal axis, and the fangs clean the surface of the pipeline not only along, but also at an angle to the longitudinal axis pipeline (RF Patent No. 2327535 C2, priority date 08/16/2005, publication date 06/27/2008, authors: Fazletdinov K.A. et al., RU, prototype).

The disadvantages of the prototype are: firstly, the design complexity due to the shape of the fangs and the use of a composite body for more efficient rotation of the clip with the fangs; secondly, the likelihood of damage to the protective coating of the pipeline due to the presence of a duralumin tooth on the edge of the fang and the formation of scratches on the protective coating during the longitudinal movement of the piston.

The technical problem solved by the utility model is the need to expand the arsenal of in-pipe tools that ensure high-quality and effective cleaning of field oil pipelines using cutting elements, as well as simplifying the design and reducing financial costs during pre-diagnostic preparation of pipelines.

To solve the technical problem, a cleaning piston is proposed, containing a tubular steel body with plugged ends, equipped with sealing elements and cleaning elements installed with the ability to cut off solid deposits on the inner surface of the pipeline. What is new is that the housing is made with guides in which a sealing collar is installed at one end of the housing, and three cleaning disks made of polyurethane are installed at the other end, these elements are mounted using bolted connections on metal mounting disks, fixed to the housing during assembly , wherein the two outer cleaning disks are separated by spacers and secured on one mounting disk, between the specified cleaning disks and the sealing collar on the body, two blocks of knives are installed and secured in the guides, designed to cut off solid deposits in a cross direction when the piston moves along the axis, the knife blocks are made in the form of steel clips with knives in the form of polyurethane plates fixed in them using bolted connections, located around the circumference at an angle of 45° to the longitudinal axis of the piston, and the knives of one block are located in relation to the knives of the second block at an angle of 90° and offset for covering the gaps between the knives.

According to the utility model, mounting metal disks and knife blocks are secured to the body by means of welded joints.

The example implementation shows a 3D1M2N cleaning piston, which contains 3 cleaning discs, one sealing collar and two knife blocks.

In fig. 1 schematically shows the specified cleaning piston, general view; in fig. Figure 2 shows a knife block.

The drawings show the following position designations:

1 - cleaning discs;

2 - knife blocks;

3 - tubular steel body;

4 - knives in the form of polyurethane plates for cutting paraffin;

5 - fastening elements;

6 - spacers;

7 - housing guides 3;

8 - housing cover;

9 - eye for removing the piston;

10 - sealing collar;

11 - metal mounting disks for fastening cleaning elements.

The inventive cleaning piston, conventionally designated 3D1M2N, contains a tubular steel body 3, made with guides 7 and with covers 8 at the ends. A sealing collar 10 is installed in the guides 7 at one end of the body, and three cleaning discs 1 are installed at the other end of the body. These elements are made of oil- and gasoline-resistant, durable and elastic material - polyurethane (https://www.europolimers.ru/poliuretan, date viewed 07/04/2023), with a diameter exceeding the internal diameter of the pipeline by the amount of interference, and mounted on metal mounting disks 11 using fasteners in the form of bolted connections. In turn, during the piston assembly process, the mounting disks are secured to the body using welded joints or fasteners if it is necessary to install more than two cleaning disks (not shown). In this case, the two outer cleaning disks 1, separated by spacers 6, are fixed on one mounting disk 11, and the third cleaning disk 1 is fixed separately for the rigidity of the piston. Between the cleaning disks 1 and the sealing collar 10 on the body, two blocks of knives 2 are installed in the guides and secured by welded joints, designed to cut off solid deposits in a cross direction when the piston moves along the axis without rotation. The knife blocks 2 are made in the form of steel clips with knives 4 fixed in them using bolted connections (5) in the form of polyurethane plates. In this case, the knives 4 are located around the circumference at an angle of 45° to the longitudinal axis of the piston, and the knives of one block are located in relation to the knives of the second block at an angle of 90° and offset to bridge the gaps between the knives. The ready-to-use structure, placed in the operating pipeline, is a bidirectional cleaning piston, in which the sealing collar 10 is also a guide and cleaning, like the cleaning disks 11. In this case, all cleaning elements 1, 2 participate in cleaning the inner surface of the pipeline from dirt and paraffin deposits and 10 with longitudinal movement of the piston, which is carried out due to the pressure difference of the working medium in front of the cuff 10 or the cleaning disk 1 and behind them, and the cuff 10 or the cleaning disks 1 clean off less dense deposits, and the knife blocks 2 cut off solid paraffin deposits. Moreover, due to the specified arrangement of knives 4 in blocks 2, rotation of the piston around the axis is eliminated, and the design of knives 4 in the form of polyurethane plates secured with bolted connections in the cage indicates a simplified design, and also eliminates the risk of damage to the internal surface of the pipeline. To remove the piston from the pipeline, an eye 9 is attached to the plugged end of the piston.

The technical result achieved by the utility model is to expand the arsenal of technical means and create a series of cleaning pistons for various diameters of oil pipelines, capable of qualitatively preparing pipelines for in-line diagnostics with lower energy costs and financial investments.

Claims (2)

1. Bi-directional cleaning piston for cleaning the internal cavity of in-field oil pipelines from asphalt, resin and dirt-paraffin deposits, containing a tubular steel body with plugged ends, equipped with sealing elements and cleaning elements installed with the ability to cut off solid deposits on the inner surface of the pipeline, characterized in that the body is made with guides, in which a sealing collar is installed at one end of the housing, and three cleaning disks made of polyurethane are installed at the other end, these elements are mounted using bolted connections on metal mounting disks, fixed to the housing during assembly, and the two outer cleaning disks are separated by spacers and fixed on one mounting disk, between the specified cleaning disks and the sealing collar on the body, two blocks of knives are installed and secured in the guides, designed to cut off solid deposits in a cross direction when the piston moves along the axis, the blocks of knives are made in the form of steel clips with sockets fixed in them using bolted connections with knives in the form of polyurethane plates located around the circumference at an angle of 45° to the longitudinal axis of the piston, with the knives of one block located in relation to the knives of the second block at an angle of 90° and offset to bridge the gaps between the knives. 2. Bi-directional cleaning piston according to claim 1, characterized in that the mounting metal disks and knife blocks are secured to the body by means of welded joints.