RU202423U1 - Filippov's scraper - Google Patents

Abstract

The utility model relates to the oil industry and is designed to implement the technology of continuous dewaxing of oil producing wells operated with submersible electric centrifugal pumping units, as well as by the flowing method. Filippov's scraper contains a body, central and control rails, flaps, springs, a trigger and a trigger pull. The scraper is equipped with upper and lower cutters, while the cutters are installed with the possibility of free rotation, and one cutter is installed with the possibility of rotation to the right, and the other cutter is installed with the possibility of rotation to the left. The dampers are equipped with elastic plates located between the metal plates. The control rail is provided with a protrusion, and the central rail is provided with a depression, while the protrusion and the depression are made to be aligned. A compression spring and an elastic gasket are fixed on the bottom of the body. The upper part of the body consists of two tubes connected with a gap with a coupling. In the upper part of the body on the tube there is a shank with a hole through which the trigger rod passes. 10 ill.

Description

The utility model relates to the oil industry and is intended to implement the technology of continuous dewaxing of oil producing wells operated with submersible electric centrifugal pumping units, as well as by the flowing method.

Known automatic scraper for cleaning the inner surface of pipes, containing a housing in the form of a sleeve, installed in it on the rotary axis valve (shutter) and a mechanism for closing, opening the flow section of the pipe (see USSR AS No. 244251, 1969). The mechanism is made in the form of a ratchet fixed to the gate, against which the bimetallic plate abuts, connected to the body, while the bimetallic plate is adjusted to a certain temperature at which it works and lowers the gate, thereby closing the flow section of the pipe.

The disadvantages of the known device are the instability of operation, the complexity of manufacture and unreliability of operation due to the presence of a spring, a ratchet mechanism and a bimetallic plate, limited use, because the shutter has only two positions - open, closed, and the impossibility of using the mechanism in scrapers with a pusher without additional improvement.

Known automatic scraper for cleaning the inner surface of the pipes, operating in a moving stream of liquid in the tubing and cleaning them from the deposition of paraffin (see RF patent No. 2237528, 10.10.2004). The scraper is made with a pusher located in guides (body in the form of bushings) with the possibility of movement and alternate interaction with the scraper travel stops at the end points of cleaning and with a shutter interacting with the pusher to open and close the flow section of the pipe.

The known scraper has several disadvantages. In some cases, the flow section closure mechanism itself is not reliable in operation due to insufficient impact energy, which depends on the speed of the scraper. The scraper speed depends on the flow rate in the pipe, as well as on the well productivity. Each pipe (well or electric centrifugal pump) has its own capacity and flow rate, i.e. the scraper can cover only a small range of pipes at flow rates.

Typically, such scrapers reach a significant weight, and in the case of initial successful operation of the mechanism, the impact of the impact also affects the reliability of the control mechanism of the flow area.

The closest analogue (prototype) of the invention is an autonomous scraper for cleaning the inner surfaces of pipes from asphalt-resin-paraffin deposits (see RF patent for useful model No. 73620, publ. 27.05.2008).

In an autonomous scraper, containing a housing with guides and knives, there is a locking unit in the form of a shutter mounted on an axis with a rack and pinion drive. The knives come in at least three different shapes. The scraper body has a length that is greater than the height of the Christmas tree. In the upper part of the body there are windows for extracting the pig from the well of any depth without damage. The rail has a circular or rectangular cross-section and is installed with the ability to move in guides and knives.

The scraper has several disadvantages. In some cases, the flow section closure mechanism itself is not reliable in operation due to insufficient impact energy, which depends on the speed of the scraper.

The features that distinguish the claimed invention from the prototype are absent in the analogue.

The technical result of the claimed utility model is to improve the reliability of the scraper operation.

The claimed technical result is achieved by the fact that the Filippov scraper contains a housing, a central and control rails, a spring flap, a trigger and a trigger pull. The scraper is equipped with upper and lower cutters, while the cutters are installed with the possibility of free rotation, and one cutter is installed with the possibility of rotation to the right, and the other cutter is installed with the possibility of rotation to the left. This allows the tubing walls to be cleaned even when the scraper moves downward. What increases the reliability of its work.

The dampers are equipped with elastic plates located between the metal plates. This provides the scraper with the ability to pass through the restriction in the tubing string, prevents sticking during operation, and provides ease of extraction.

The control rack is provided with a protrusion, and the central rack is provided with a depression, while the protrusion and the depression are made to be aligned. This is the synchronization of the movement of the racks, which contributes to the reliable operation of the scraper.

The upper part of the body consists of two tubes, connected through a sleeve with a gap, which allows deviation from alignment. This allows the pig to pass through the bends in the tubing string.

A compression spring and an elastic gasket are fixed on the bottom of the body. The spring allows for cushioning and avoids deformation upon impact with the stop ring. The gasket prevents the rails from hitting the body.

In the upper part of the body on the tube there is a shank with a hole through which the trigger rod passes. This allows the pig to be retrieved from the borehole using a fishing device. When the scraper is gripped by the fishing device, the trigger is triggered and the flaps are positioned vertically, which simplifies lifting.

This design makes the device generally reliable.

Figure 1 shows the Filippov scraper assembly, the dampers are located vertically, front view; figure 2 shows the scraper assembly, the shutters are located vertically, side view; Figure 3 shows a cross-section of the scraper body; Figure 4 shows the central rail of the scraper, the flaps are located horizontally; Figure 5 shows a scraper control bar; Figure 6 shows a cross-section of the scraper body; Figure 7 shows a pull rod assembly with a tension spring; Figure 8 shows a sectional view of the damper assembly; Figure 9 shows a right-hand cutter; Figure 10 shows a left-hand cutter.

The scraper consists of a housing 1 (Fig. 3), inside which the central rack 2 (Fig. 4) and the control rack 3 (Fig. 5) move. The body 1 and rails 2 and 3 are connected by tension springs 4 and 5 (Fig. 2), the force of which tends to raise both rails to the upper position relative to the body. On the central rail 2 (Fig. 4) flaps 6 are movably fixed, the flaps 6 are connected to the control rack 3 (Fig. 5) through the rods 7. The flaps 6 include axis 8 (Fig. 8), upper 9, middle 10 and lower 11 metal plates fixedly connected. Elastic polyurethane plates 12 are installed between the middle and lower metal plates with a gap through cotter pins. On the central rail 2 there is a depression 13, and on the control rail 3 there is a protrusion 14. The synchronization of the movement of the rails during the downward stroke is ensured by the cavity 13 (Fig. 4) and the protrusion 14 (Fig. 5). An axis 15 (Fig. 3) is fixed on the body, on which the trigger 16 (Fig. 7) is mounted. Inside the body there is a pull rod 17 (Fig. 6, 7). A tension spring 18 is attached to the trigger pull 17. The force of the tension spring 18 (Figs. 1, 7) tends to raise the trigger pull 17 and turn the trigger 16. The trigger fixes the control rail 3 in the lower position, clinging to the axis 19 mounted on the control rail 3 . (fig. 5). A compression spring 20 (Fig. 1) and an elastic gasket 21 (Fig. 6) are fixed on the body from below. The upper part of the body is in the form of tubes, a lower tube 22 and an upper tube 23 (Fig. 6). Tubes 22 and 23 are connected by a sleeve 24, with a gap 25 between the pipes and the sleeve (Fig. 6). Milling cutters 26 and 27 and a shank 28 (Fig. 1) are mounted on the upper tube 23 for rotation. A hole 29 is made in the shank 28, into which the trigger rod 17 is inserted (Fig. 6). A container 30 (Fig. 1) with magnets is fixed between the cutters 26 and 27.

The cutters 26 and 27 are installed in such a way that one of them rotates to the right and the other rotates to the left.

Filippov's scraper works as follows.

Filippov's scraper is an automatic flying scraper for continuous dewaxing of wells - a mechanical cleaning method. The principle of operation of the scraper consists in continuous movement inside the tubing string (tubing), limited at the top by the plane of the closed lubricator valve, at the bottom by a stop ring fixed in the coupling, which is located below the point of the beginning of the formation of asphalt-resin-wax (ARPO) and other deposits.

A scraper with vertically positioned flaps is placed in a lubricator installed on a production tree of a working well. After opening the lubricator valve, the scraper moves downward under the action of gravity with vertically positioned valves. Cutters 26 and 27 rotate freely and clean out deposits on the tubing walls while moving down. Since the cutters rotate in different directions, a more thorough cleaning of the tubing occurs. After the impact of the scraper with the stop ring, the slats move to the lower position under the action of inertial forces; while the protrusion 14 and the depression 13 on the rails 2 and 3 are aligned and the heavier central rail 2 pulls the lighter control rail 3. The trigger fixes the control rail 3 in the lower position, and the central rail 2 returns to the upper position under the force of the tension spring - 4-5, while the shutters 6 take a horizontal position. The scraper begins to move upward with the flow of wellbore fluid. When moving up, horizontally located flaps cut the wax layer from the tubing walls, cleaning them. There is a contact between the lubricator valve and the trigger rod 17. The trigger 16 releases the control rod 3, it returns to the upper position and the shutters 6 are rotated to the vertical position. The flaps 6 are arranged vertically and the cycle is repeated.

The scraper works without the use of wires, autonomously, and prevents the formation of paraffin plugs. Filippov's scraper is reliable in operation and provides high-quality cleaning of tubing.

The scraper can be manufactured using the available technical means on the existing equipment.

Claims (1)

A scraper for cleaning tubing pipes from asphalt-resin-paraffin deposits, containing a body, central and control rails, dampers, springs, a trigger and a trigger pull, characterized in that the upper part of the body consists of two tubes connected by a coupling with a gap, the scraper is equipped with an upper and lower milling cutters installed on the upper tube, a container with magnets is placed between the cutters, the cutters are installed with the possibility of rotation, and one cutter is installed with the ability to rotate to the right, and the other cutter is installed with the ability to rotate to the left, the dampers are equipped with elastic plates located between the metal plates, the control rail is equipped with a protrusion, and the central rail is equipped with a depression, while the protrusion and the depression are made with the possibility of alignment, a compression spring and an elastic gasket are fixed on the body from below, a shank with a hole through which the trigger rod passes is mounted on the tube in the upper part of the case.

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