RU51537U1 - DEVICE FOR CLEANING PIPE WELLS IN OIL PRODUCTION - Google Patents

Abstract

Device for cleaning pipe wells in oil production. The utility model relates to a device for cleaning pipe wells from deposits during oil production. A device is proposed comprising a scraper 1, a scrap 2 for lowering and lifting on a wire 3 in the borehole of a pipe 4, characterized in that the scrap is equipped with at least one knife with sharpened edges 5 and angles of attack of at least 5 ° on both sides, in this case 45 ° (Figs. 3, 4). The knives are installed with the possibility of adjustment according to the diameter of the pipe, for example, using fasteners or can be interchangeable, in the latter case they are fixed on the scrap by means of clamps; in the case of the same diameter of the pipes being cleaned, the knives can be welded to the scrap or cast along with the scrap. The crowbar can be made cross-shaped, i.e. to have four knives (at an angle of 90 ° relative to each other) (Fig.3, 4). The scrap body should be ground for less adhesion to paraffin and can be made of sheet steel 3-5 mm thick, 150 cm long. The angle of attack of the knife can be 45 ° (Fig. 3). The device may contain a number of knives arranged by faces 5 longitudinally, along a helical or spiral line relative to the vertical axis of the scrap (Fig. 3). When using such a device, the sharp edges of the scrap will cut paraffin.

Due to its streamlined shape, the speed of descent of the scraper with crowbar increases significantly. You can avoid changing the mode of operation of the well. When using the utility model, the productivity and profitability of the operation of pipe wells are increased.

Description

The utility model relates to a device for cleaning pipe wells from deposits during oil production.

There are a number of difficulties in producing oil from the reservoir, especially when recovering heavy oil with a high content of tar and paraffin. When rising from the reservoir, the oil cools and tar and paraffins are deposited on the pipes.

The traditional way to deal with sediment is to lower and raise the scraper.

In order to lower the scraper, it is necessary to transfer the well to a smaller fitting (diameter), i.e. reduce the fluid flow so that the scrap can easily pass down, as paraffin deposited on the pipe walls interferes with it. Having a circular cross-section, the scrap for the most part comes in contact with paraffin, which significantly reduces the speed of the scraper descent, which, in turn, increases the operating time of the well with a smaller nozzle, which leads to a shortage of a certain number of oil cubes.

There is also a problem called in the oil industry throws. When lifting, the scraper, raking up the paraffin, is poorly washed due to the small fluid flow, since the scrap has a large resistance area. At the same time, it is impossible to increase the flow of liquid, otherwise the scrap will raise the liquid faster than the actual rise. Accumulating on the scraper, paraffin plugs the well, a plug forms, which leads to a pressure drop in the well. Over the cork, the pressure drops, under

the cork grows, then a “shot” follows, and a wad of wire, scrap and a scraper is obtained, which often ends in costly downtime and well repair.

A known device dynamic scraper SD.05.

The dynamic scraper is designed to clean tubing from paraffin and other deposits in gushing wells and wells equipped with electric centrifugal pumps (ESP), while there is a periodic cleaning of tubing in production wells from paraffin and other deposits; removal of residual deposits in other methods of cleaning wells.

The dynamic scraper consists of a lower scraper, a weighting compound, an upper scraper and a rape socket. In all connections, a locking sleeve is used.

Rapsocket is used for attaching to the wire d 1.8 ... 2.5 mm, through which the device is attached to the traction body.

Using a minimum set of scraper support the borehole. The scraper is periodically lowered into the well in accordance with the established schedule (1).

The closest analogue is the device described in source 2, including a scraper and scrap for lowering and lifting on the wire in the borehole of the pipe.

The scraper is screwed to the load (crowbar) on the thread and descends into the pipe well on the wire.

During the descent, the scraper folds; during the ascent, the paraffin opens and strips off the pipe walls.

Until recently, the mechanical method of removal has prevailed.

paraffin deposits from the walls of the lifting pipes, carried out using scrapers of various designs.

Cleaning of the lifting pipes from paraffin with scrapers is carried out during the operation of the well without stopping it.

Scrapers are lowered into pipes on a wire. Their downward movement is effected by the force of gravity of the scrapers themselves and the loads suspended from them (up to 10 kg), and the scrapers are lifted upward by a winch.

When using scrapers on the wellhead reinforcement, a lubricator with an oil seal is mounted. Its length should be such that the scraper and the load completely fit in it.

For the descent of the scrapers into the well and their lifting, automatic dewaxing units (ADU) are used. The ADU installation consists of a winch with an electric motor and a control station, which are placed near the well in the booth (2).

The disadvantages of mechanical cleaning of lifting pipes from paraffin include the fact that each well has to have additional equipment that needs to be maintained and which is a source of additional malfunctions during well operation (wire breakage, failure of individual units, etc.). Analogs have insufficient performance, reliability. The objective of the utility model is to develop a sufficiently reliable and productive device for cleaning pipe wells during oil production, and the technical result is the streamlining, speed and throughput of the device during pipe operation.

To this end, a device comprising a scraper, scrap for lowering and lifting on a wire in a pipe borehole is proposed, characterized in that the scrap is equipped with at least one knife with sharpened edges and angles of attack of at least 5 ° on both sides.

The device is illustrated by drawings, which depict:

figure 1 is a diagram of pipe cleaning in the industry, figure 2 is the location of a similar cargo (scrap) in the pipe, figure 3 is a device with a scrap of the claimed design, figure 4 is the location of the scrap of figure 3 in the pipe.

In a similar device, the scraper 1 is screwed to the load (crowbar) 2 on the thread and on the wire 3 descends into the borehole of the pipe 4 (Fig. 1). During the descent, the scraper develops, during the ascent, the paraffin 6 is opened and strips off the pipe walls (Fig. 2).

A device is proposed comprising a scraper 1, a scrap 2 for lowering and lifting on a wire 3 in the borehole of a pipe 4, characterized in that the scrap is equipped with at least one knife with sharpened edges 5 and angles of attack of at least 5 ° on both sides, in this case 45 ° (Figs. 3, 4).

The knives are installed with the possibility of adjustment according to the diameter of the pipe, for example, using fasteners or can be interchangeable, in the latter case they are fixed on the scrap by means of clamps; in the case of the same diameter of the pipes being cleaned, the knives can be welded to the scrap or cast along with the scrap.

The crowbar can be made cross-shaped, i.e. to have four knives (at an angle of 90 ° relative to each other) (Fig.3, 4).

The scrap body must be ground for less adhesion to paraffin and can be made of sheet steel 3-5 mm thick, 150 cm long.

The angle of attack of the knife can be 45 ° (figure 3).

The device may contain a number of knives located by the faces 5 longitudinally, along a helical or spiral line relative to the vertical axis of the scrap (figure 3).

When using such a device, the sharp edges of the scrap will cut paraffin.

With an inner pipe diameter of 62 mm, the optimum scrap diameter is 58-59 mm.

Due to its streamlined shape, the speed of descent of the scraper with crowbar increases significantly. You can avoid changing the mode of operation of the well, which will allow you to get additional income from oil production.

When using the utility model, the productivity and profitability of the operation of pipe wells are increased.

Information sources:

1. Scraper dynamic company Jet Systems (Internet).

2. V.M. Muraviev. Operation of oil and gas wells, Moscow, Nedra, 1978, p. 55.

Claims (4)

1. Device for cleaning pipe wells during oil production, including a scraper and scrap for lowering and lifting on a wire in the pipe well, characterized in that the scrap is equipped with at least one knife with a pointed edge, which is installed with the possibility of adjustment according to the diameter of the pipe. 2. The device according to claim 1, characterized in that the knives are located at an angle of 90 ° relative to each other, forming a cross-section. 3. The device according to claim 1, characterized in that the angle of attack of the knife is at least 5 °. 4. The device according to claim 1 or 2, characterized in that it contains a number of knives arranged longitudinally by faces, along a helical or spiral line relative to the vertical axis of the scrap.