Scraper for cleaning tubing from asphaltoresinparaffin deposits

 

The invention relates to the field of oil production and is intended for cleaning tubing (tubing) from asphaltoresinparaffin deposits (ARPD) using a scraper plate type. The body of the scraper is fixed on the wire and consists of at least two rods connected by a hinge. On the lower end of the housing is fixed sinker. Around the perimeter of the housing is fixed detachable connection of the treatment elements. At each terminal housing fixed to one pair of treatment elements, which are mounted on diametrically opposite sides of the housing and offset relative to each other along the axis of the hull not less than half the length of the cutting element. Each subsequent pair of treatment members on the rod offset from the pair of treatment members at the previous pivot 90°. Each of the treatment element consists of a plate with a double-edged edges oriented along the axis of the housing and rigidly secured to the end plate parallel to the body axis of the cutting element made in the form of diamond-shaped, convex in the direction of the cleaned pipe plate. The direction of the major diagonal of the plate coincides with the axis of the body, and the sides are fluted with ODST cutting element is made hollow, and the cutting edges are bent inward toward the plate with a double-edged edges. Treatment elements fixed to the body with the possibility of changing the transverse dimensions of the scraper. Increases the efficiency of cleaning. 3 C.p. f-crystals, 3 ill.

The invention relates to the field of oil production, namely the exploitation of oil gushing wells, wells equipped with electrical submersible pumps (ESPs), and is intended for cleaning the inner surface of the tubing (tubing) from asphaltoresinparaffin deposits (ARPD) mechanically - using scrapers, with subsequent removal of sediment by the flow of fluid from the well.

The currently known mechanical methods of cleaning tubing from ASPO using scrapers three types:

- flying;

- spiral, screw;

vane.

Application of a flying pig when cleaning the tubing from ASPO has big limitations. Their use requires preliminary work on the careful culling of tubing to prevent jams, jamming scrapers in the tubing. Attempts to use the flying pig on wells with high flow rate due to the increased weight of the scraper is about a scraper in the casing in the zone of intensive deposition of paraffin.

Cleanup the tubing from ASPO using any of a spiral scrapers based on operation cast into rotational motion of the cutting elements fixed at a certain angle on the body of the scraper.

However, for effective cleaning of the inner surface of tubing from ASPO requires the creation of a high-speed rotation of the cutting elements of the scraper, to ensure when cutting paraffin large thickness is impossible. Very low speed of rotation of the cutting elements define the inertial moment of the scraper during its movement, leads to a low quality pipe cleaning. Moreover, in the intervals of intense deposition of paraffin in the tubing possible full stop scraper, and the breaking down of these intervals by raising the scraper and its abrupt lowering effect is not given. This increases the possibility of a “goal” of the scraper and, consequently, the entanglement of the scraper wire and possible breakage.

Widespread in the fields of the received device for cleaning the inner surface of the tubing in the borehole using a scraper plate type various modifications. The efficiency of removal of deposits from the inner surface of the tubing is determined by the form ochotnicky tubing from asphaltoresinparaffin deposits (ARPD), including secured to the scraper wire body with a weight at the lower end and is fixed uniformly on the perimeter of the housing and offset along the longitudinal axis of the treatment elements. The body is made of a composite of at least two rods connected by a hinge. Each cleaning element consists of a plate with a double-edged edges oriented along the axis of the housing, and fixed to the end plate parallel to the body axis of the cutting element made in the form of diamond-shaped convex in the direction of the cleaned pipe plate, large diagonal direction which coincides with the axis of the casing, and the side cutting edges are one-way in the direction of the inner surface of the cutting element sharpening. The case is fixed for at least six treatment items, they are fixed to the body so that the cutting paraffin is in the form of six lanes around the perimeter of the surface being cleaned (see the certificate in the Russian Federation for useful model No. 15908, CL E 21 B 37/02, 2000).

In the course of such a scraper down is cutting paraffin cutting edges and convex outer surfaces of the diamond-shaped plates along the perimeter of the cutting elements in the form of equal strips, each of which is down and cut the paraffin stream of liquid is taken up. When lifting the scraper cutting process is similar.

The disadvantages of the known scraper should be attributed to the lack of efficiency of cleaning the inner surface of the tubing from ASPO, especially when large thicknesses and hardness deposits, large energy and labor for such work in connection with the fact that treatment elements fixed to the body tightly, so there is no possibility of precise control of the transverse dimensions of the scraper depending on the degree of separativeness. For complete cleaning of tubing from ASPO raised on the surface of the scraper must be replaced with a different size to the diameter of the treatment elements and continue to make the descent-ascent scraper repeatedly.

Such constructive implementation of treatment elements does not exclude stuck pig with a small pipe bore separational tubing. When lifting the scraper again there is a sharp increase efforts on cutting paraffin, as when cutting involves not only cutting edge, but the convex surface of the diamond-shaped plates of the cutting elements, which increases the area of the rubbing surfaces. To provide this increased force may nab the URS, especially the curved part thereof, or to the edge of the scraper wire.

Moreover, the known scraper due to the presence of a large number of treatment elements (at least six) has a greater length of the body, which complicates the delivery of the scraper in the area of paraffin, and because of the presence of a large number of suzanah” elements in the design of the difficult descent of such a device in inclined wells with a curved ground equipment.

The technical result achieved by the device according to the invention are the higher efficiency of cleaning the inner surface of the tubing from ASPO, including large thicknesses and hardness deposits, in the presence of curvature of ground equipment, the curvature of the wellbore, which move the scraper, an increase masochisthalo period wells, reduce energy and labor costs.

This technical result is achieved scraper tubing from ASPO, including secured to the scraper wire housing consisting of at least two rods connected pivotally at the lower end of which is assigned a weight, and is fixed uniformly on the perimeter of the housing and offset along the longitudinal axis of the body of ocotpus, and rigidly attached to the end plate parallel to the body axis of the cutting element made in the form of diamond-shaped convex in the direction of the cleaned pipe plate, large diagonal direction which coincides with the axis of the casing, and the side cutting edges are one-way in the direction of the inner surface of the cutting element sharpening, which is offered on the outer convex surface of the cutting element to perform the slot, and cutting edges to bend inward toward the plate with a double-edged edge, the rigid connection of the treatment elements with the body to perform the folding and treatment elements mounted on the housing with the possibility of changing the transverse dimensions of the scraper, at each terminal housing to secure one pair of treatment members that install on diametrically opposite sides of the housing and offset relative to each other along the axis of the hull not less than half the length of the cutting element, with each subsequent pair of treatment elements to move relative to the pair of treatment members at the previous rod 90.

The casing scraper is mostly a square section.

Treatment elements mounted on cougie elements are made of hardened.

This technical result is achieved due to the following.

Due to the fact that the rigid connection of the treatment elements with the body is made collapsible and cleaning elements attached to the housing with the possibility of changing the transverse dimensions of the scraper from minimum to maximum (due to implemented in the base plate with double-edged transverse edges of the slots and screws), it is possible to change the cross sectional dimensions of the scraper depending on the thickness, the hardness of the paraffin deposits on the walls of the tubing.

This allows not only to reduce the force on the cutting paraffin, but also to bring this effort to a constant value as in the course of the scraper down and up during that dramatically increases the efficiency of cleaning of the pipes, especially when large thickness and the hardness of the deposited paraffin, and allows for the efficient cutting of deposits around the perimeter of the pipe. This design allows execution to leave the bucket in the well to the time necessary for carrying out the main mass of the cut during the descent paraffin scraper and for future deposits on the walls of tubing allowable thickness of deposits, which can cut scraper data sizes when lifting, and to provide cutting ASPO when Ho is th wells and character of paraffin formation).

In addition, thanks to the constructive implementation provides the ability to change treatment elements in case of failure.

Due to the fact that the outer convex surface of the cutting element is made hollow, and the cutting edge of the diamond plate are bent inward toward the plate with a double-edged edges, providing for a reduction of the strain on the cutting ASPO, as new cutting edge geometry provides a smooth transition in the work of one of the cutting edges to the other to provide smooth load redistribution after cutting, and the concavity on the outer surface reduces the contact surface and reduces the force on the cutting paraffin.

Due to the fact that the cutting edges are bent inward toward the body, provided the increase of the cutting edges, and cut off all the wax is directed into the space between the edges of the cutting element, and here is cut and crushed edges, two-edged plate, bypassing the outer concave surface, which reduces the effort of cutting paraffin, eliminates the formation of traffic jams and facilitates the removal of paraffin on the surface with the fluid flow.

Due to the proposed location of the treatment elementov articulated connection of the housing parts with treatment elements, ensures uniform cutting paraffin around the perimeter of the cleaned pipe as in the course of the scraper down and up, so as not to form a gap between the cutting edges of the cutting elements, which provides the highest quality cleaning. Thus the performance of the composite body of at least two rods connected pivotally, shortened in comparison with the known prototype scraper length, defined by one pair of the treatment elements of the proposed forms, geometry, provides multiple decrease their beats, hooks in the downhole valve, particularly in a curved surface equipment, coupling joints of tubing and wellhead equipment.

The invention is illustrated by drawings, where Fig.1 shows an external view of a scraper in the tubing string of Fig.2 - a view a-a in Fig.1; Fig.3 - cleaning scraper element (side view).

Scraper plate type includes a housing 1, on the outer surface of which is uniformly along the perimeter and offset along the longitudinal axis is fixed cleaning elements 2, and the lower end of the housing 1 is fixed sinker 3.

Case 1 a scraper made of a composite of at least two links in the form of rods 4 and 5 are connected to each other by means of a hinge 6. The rods 4 which element is provided 2 is a plate 7 with a two-edged edges 8, oriented along the axis of the housing 1, and the cutting element 9, is rigidly fixed to the end plate 7, for example, argon-arc welding, parallel to the longitudinal axis of the housing 1. On the plate 7 by fastening it to the body 1 has a transverse grooves 10 of increased length. By means of screws 11 to be installed in these slots 10 in the desired position (far, middle), treatment elements 2 are mounted on the housing 1. This is an opportunity to change the lateral dimension of the scraper from minimum to maximum in the range of 0.66 to 0.9 of the diameter of the cleaned tubing. This rigid connection is detachable, allowing you depending on conditions separationist to change the transverse dimensions of the scraper or replace defective cleaning element 2.

The cutting element 9 is made in the form of a plate having a diamond shape, the sides of which are the cutting edges 12, and diamond plate is made convex in the direction of the cleaned pipe 13. On the outer convex surface of the cutting element 9 is made of the recess 14. The cutting element 9 mounted on the plate 7 so that the direction of the large diagonal of the diamond-shaped plate coincides with the axis of the housing 1. The cutting edges 12 of the cutting element 9 are bent inward at the sides of the Cup 9 and are self-sharpening.

At each terminal 4 and 5 of the housing 1 is fixed to one pair of the treatment element 2. In each pair of cleaning elements 2 are arranged diametrically to each other and offset along the axis of the housing 1 is not less than half the length of the cutting element 2. This pair of treatment elements 2 on the rod 5 is displaced relative to the pair of treatment elements 2 on the rod 4 90.

The surface of the housing 1, the treatment element 2 is polished, corrosion-resistant metal of high hardness. All cutting element 2 is hardened, for example, ion nitriding.

Under the case 1 is fixed swivel sinker 3, having in the upper part of the shape of a truncated cone. The weight of the sinker 3 is determined by the magnitude of the force on the cutting paraffin scraper during its down. In the casing 13 of the scraper is lowered slick line 15.

The transverse size of the scraper is set depending on the installed during the preparatory works of the thickness of deposits 16 on the inner surface of the tubing 13 by setting the screw 11 in the groove 10 at the required level (minimum transverse size of 44 mm, the maximum is 54 mm).

Before lowering the scraper into the tubing string carry out preparatory operations, including the study of iskrivlennoi wells is of the type the definition of a technological mode of wells, flow rate, depth, thickness and composition (hardness) of paraffin formation. These options allow you to mount a scraper before lowering it into the well. The thickness and hardness of paraffin determine the minimum transverse dimension of the treatment elements of the scraper, which provides efficient cutting of paraffin at the course down, except the jam. Treatment elements of the scraper is fixed so that all the cutting edges during movement of the scraper in the tubing string were oriented along the surface being cleaned. Thanks to this cutting paraffin occurs around the perimeter of the cleaned pipe as in the course of the scraper down, and when the course up. The magnitude of the flow rate determine the optimal weight of the sinker, to ensure proper promotion of the scraper without jumps and without increasing efforts on cutting.

Scraper in position lowered into the tubing string.

Scraper, meeting the deposition of paraffin in the tubing 13, destrucive its cutting edges 12 of the cutting elements 9 in the form of four equal strips, each of which in turn a sharp edge 8 of the plate 7 is cut again lengthwise into two parts. Scraper under the weight of the sinker 3 continues to move down, and cut and rneasy up, excluding the formation of traffic jams and clogging of the cutting elements.

Upon reaching the depth of the well free from deposits of paraffin, further descent of the scraper stops. To ensure a more complete removal of cut shredded deposits with regard to ESP performance (flow rate) scraper in the bottom position leave the shutter speed determined by the time necessary for carrying out the main mass of the cut during the descent paraffin scraper and for future deposits on the walls of tubing allowable thickness of deposits, which can cut scraper data sizes when climbing up. So much for superfinely wells, the exposure time is from 15 minutes to 1.5 hours, and for wells placed on the mode, the exposure time of the scraper in the well before his rise is determined by the intensity of the deposition of paraffin and taking into account the transverse dimensions of the scraper and can range from 8 to 24 hours. Next, the signal at the rise of a scraper for scraping the wire 15 up. Essentially scraper in this case will go on tubing 13, in which was deposited the wax during the descent of the scraper, and the exposure time. The transverse dimensions of the scraper will be quite enough to fully perform the cutting of the newly deposited paraffin. When lifting excluded Mature effort sectioning of paraffin.

Depending on the nature of the well, the volume content of deposits, their physico-chemical properties, the intensity of their loss, the water content of oil, adherence to the established mode of operation of the well and the graphics are clean tubing from paraffin option “shutter speed” of the scraper in the bottom position for a longer time (up to several hours), which will increase megacity period. Subsequent lifting of the scraper it will astrogemini incorporated wax from the walls of tubing which may be used with fluid flow ahead of the scraper, or when the velocity of the fluid less than the speed of movement of the scraper up, cut ASPO will “fall” through the scraper in the tubing and for this reason will be immediately carried out of the well. Due to the rather small frontal cross-section of the scraper and constructive execution of the cutting elements 9 clogging paraffin scraper is excluded. To avoid mashing the sinker 3 fractions of paraffin when lifting the scraper upper portion of the sinker 3 must be truncated cone on the length of 120-150 mm

Thus, the present invention allows

to ensure a constant process of sectioning paraffin as in the course of the scraper down and up;

- repeatedly to reduce the ensured sustainable and rapid removal of the tubing;

depending on the degree of separationist tubing to change the transverse dimensions of the same scraper by adjusting the position of the treatment element on the housing;

- increase megacity period in 1,5-2 times;

- increase 2 times the performance of the work;

to reduce to 1-2 times energy and labor by eliminating the excess of UPS and downs scraper;

- exclude completely the hooks and jumps scraper in the borehole;

- to have a more simple and reliable design.

Claims

1. Scraper for cleaning tubing from asphaltoresinparaffin deposits, including secured to the scraper wire body comprising at least two rods connected pivotally at the lower end of which is assigned a weight, and is fixed uniformly on the perimeter of the housing and offset along the longitudinal axis of casing treatment elements, each of which consists of a plate with a double-edged edges oriented along the axis of the housing, and fixed to the end plate parallel to the body axis of the cutting element made in the form of diamond-shaped, convex in the direction of the cleaned pipe, plate, the direction of borellini the inner surface of the cutting element sharpening, characterized in that on the outer convex surface of the cutting element is made hollow, and the cutting edges are bent inward toward the plate with a double-edged edge, the rigid connection of the treatment elements with the body is made collapsible and cleaning elements attached to the housing with the possibility of changing the transverse dimensions of the scraper, with each terminal housing fixed to one pair of treatment elements, which are mounted on diametrically opposite sides of the housing and offset relative to each other along the axis of the housing at less than half the length of the cutting element, with each subsequent steam treatment elements on the rod offset from the pair of treatment members at the previous pivot 90°.

2. Scraper under item 1, characterized in that the housing has a square section.

3. Scraper under item 1, characterized in that the cleaning elements attached to the housing by means of made in the base plate with double-edged transverse edges of the slots and screws.

4. Scraper under item 1, characterized in that the cutting elements are hardened by the method of ion nitriding.

 

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FIELD: oil and gas industry.

SUBSTANCE: device has hollow body with through ports along whole length, axes of which are displaced relatively to one another along spiral. Scraping elements in form of separate resilient brushes are mounted in through ports on basis of condition of providing for cleaning by working surfaces - ends of separate resilient brushes and free exit of removed deposits between brushes and hollow body. Separate resilient brushes are in form of bushings with pressed in bunches of steel wires, which are mounted in through ports with overlapping of each other and possible overlapping by working surfaces - ends of separate resilient brushes of whole inner perimeter of cleaned pipe. Bushings with pressed in bunches of wires are made enlarged in size according to inner diameter of cleaned pipe in accordance to yielding condition of separate brushes material. Spiral coiling angle is 180 degrees.

EFFECT: higher efficiency.

4 dwg, 1 ex

FIELD: oil and gas industry.

SUBSTANCE: device is made with possible use in conjunction with scraper for removal of paraffin precipitations. Device includes end piece for connection to well device and metallic rod with variable cross-section. Rod is made in form of at least three serially placed truncated cones. Cones have double relation of greater diameter to lesser diameter.

EFFECT: higher efficiency.

4 cl, 2 dwg

FIELD: oil and gas industry.

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EFFECT: higher manufacturability.

12 cl, 2 dwg

FIELD: oil industry.

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EFFECT: higher efficiency.

5 cl, 1 dwg

FIELD: oil industry.

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EFFECT: higher efficiency.

4 cl, 12 dwg

FIELD: oil industry, particularly to perform working operations in oil and injection wells.

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EFFECT: reduced costs demanded for well repair, simplified structure and increased environmental safety.

2 dwg

FIELD: oil production, particularly methods or apparatus for cleaning boreholes or wells.

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EFFECT: extended range of device application to prevent and eliminate paraffin and hydrate deposits and plugs.

14 cl, 2 ex, 2 dwg

FIELD: oil production, particularly equipment to remove paraffin from wells.

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EFFECT: provision of automatic well cleaning operation, increased simplicity of device mounting and operation and extended service life.

4 cl, 10 dwg

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EFFECT: increased operational stability.

6 cl, 4 dwg

FIELD: oil production, particularly devices for sucking rod centering and paraffin deposits removal from tubing string walls.

SUBSTANCE: device comprises cylindrical bush with two blades made as double spiral. Upper and lower ends of each blade are spaced 180° one relatively another. Flats are made in blade and cylindrical bush end surfaces. Channel defined by two blades smoothly envelopes cylindrical bush.

EFFECT: decreased flow string and sucker rod wear, increased efficiency of paraffin removal, decreased loads applied to sucker rod and flow string, increased reliability of bottomhole equipment operation and extended overhaul life.

2 dwg

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